Journal articles on the topic 'Silica fume'
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Sopa N.R, Yra Maya, Sartika Nisumanti, and Denie Chandra. "Pengaruh Penambahan Silica Fume Terhadap Kuat Tekan Beton Fc’25." Publikasi Riset Orientasi Teknik Sipil (Proteksi) 5, no. 1 (June 21, 2023): 1–6. http://dx.doi.org/10.26740/proteksi.v5n1.p1-6.
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Beton salah satu bahan utama dalam bidang kontstruksi. Bangunan insfrastruktur seperti gedung, jembatan, irigasi dan jalan semuanya menggunakan beton sebagai bahan utama. Silica fume adalah material pozzolan yang halus, berbentuk butiran, sangat kecil, mengandung senyawa silika dioksida (SiO2) dan alumina (Al2O3) yang berpengaruh dalam proses pengerasan pada beton. Penggunaan silica fume pada campuran beton dapat menghasilkan beton dengan kuat tekan yang tinggi. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan silica fume dengan variasi kadar silica fume sebesar 10% dan 20%. Menggunkan metode eksperimen sesuai standar SNI 03-2834-2000 untuk memperoleh hasil yang akan mengkonfirmasi variasi yang diteliti. Hasil dari penelitian menunjukkan kuat tekan optimum terdapat pada kadar silica fume sebesar 20% dengan kuat tekan beton 27,20 MPa pada umur beton 28 hari, dengan meningkatnya proporsi campuran silica fume kemampuan kerja beton semakin meningkat. Dari hasil penelitian tersebut dapat diketahui semakin tinggi kadar silica fume maka workabilitas beton semakin berkurang, hal ini terjadi karena sifat silica fume yang menyerap air.
Kata Kunci: Beton, Silica Fume, Kuat Tekan Beton
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Al-Soudany, Kawther. "Remediation of Clayey Soil Using Silica Fume." MATEC Web of Conferences 162 (2018): 01017. http://dx.doi.org/10.1051/matecconf/201816201017.
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This paper evaluates the use of silica fumes as modification of fine-grained soil in order to alter undesirable properties of the native soil and create new useful soils. Silica fume as well as clay material, are used in changing the engineering properties to be compatible and satisfying this is due to their pozzolanic reactivity. The study aims to investigate the uses of these materials in geotechnical engineering and to improve the properties of soils. Four percentages of silica fumes were used in the present study, which is 0, 3, 5 and 7%. Classification, specific gravity, compaction characteristics, swell and swell pressure, CBR and compressive strength tests had been conducted on the prepared and modified soils. Results clarified that the silica fume increasing leads to decrease the plasticity index and liquid limit. Increasing in silica fume causes an increasing in plastic limit and optimum water contents while the maximum dry unit weight values decrease. The compressive shear strength, California Bearing Ratio (CBR), swell and swell pressure is improved by using silica fume so that silica fume can be considered as a successful material in improving the soil properties.
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Jinnai, H., T. Saeki, and S. Nagataki. "Silica Fume." Concrete Journal 52, no. 5 (2014): 399–404. http://dx.doi.org/10.3151/coj.52.399.
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Tarru, Reni Oktaviani. "Studi Penggunaan Silica Fume Sebagai Bahan Pengisi (Filler) Pada Campuran Beton." Journal Dynamic Saint 3, no. 1 (March 18, 2018): 472–85. http://dx.doi.org/10.47178/dynamicsaint.v3i1.271.
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Enter an abstract of up to 250 words for all articles. This is a concise summary of the whole paper, not just the conclusions, and is understandable without reference to the rest of the Silica fume merupakan produk sampingan (biproduct) dari suatu proses industri silicon metal. Silica fume mengandung kadar SiO2 yang tinggi dan merupakan bahan sangat halus, berbentuk butiran, sangat kecil, dan biasanya disePbut dengan mikro silika. Silica fume mengandung unsur SiO2 lebih dari 85% dengan demikian silica fume dapat dikategorikan sebagai pozzoland. Terdapat kelebihan tersendiri apabila kita menggunakan silica fume dalam proses pembuatan beton mutu tinggi, kelebihan tersebut antara lain: meningkatkan workabilitas untuk jangka waktu yang lama, meningkatkan stabilitas dan keterpaduan campuran beton segar, Ketahanan beton meningkat drastik, air resapan pada beton banyak berkurang, gas didalam beton banyak berkurang, peningkatan yang besar ketahanan terhadap karbonasi, perembesan klorid dalam beton banyak berkurang, kekuatan awal dan akhir yang tinggi.
Penelitian ini dilakukan dengan membandingkan sampel beton yang dibuat dalam kondisi normal dengan sampel beton yang menggunakan silica fume sebagai bahan pengisi (filler) sebesar 5%, 10%, dan 15% dengan metode eksperimental yaitu melakukan pengujian sampel di Laboratorium.
Hasil penelitian menunjukkan kuat tekan beton normal pada umur 28 hari yaitu 37,10 Mpa, untuk penambahan 5% silica fume f’c = 40,39 Mpa, dan untuk penambahan 10% silica fume f’c= 41,88 Mpa, penambahan 15% silica fume f’c = 43,62 Mpa.
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Sutriono, Bantot, Retno Trimurtiningrum, and Aditya Rizkiardi. "Pengaruh Silica Fume sebagai Subtitusi Semen terhadap Nilai Resapan dan Kuat Tekan Mortar (Hal. 12-21)." RekaRacana: Jurnal Teknil Sipil 4, no. 4 (November 29, 2018): 12. http://dx.doi.org/10.26760/rekaracana.v4i4.12.
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ABSTRAKBeton dan mortar banyak digunakan sebagai bahan konstruksi di seluruh dunia. Meningkatnya permintaan beton dan mortar juga meningkatkan permintaan semen di pasar yang berdampak negatif bagi lingkungan. Industri semen menghasilkan sekitar 6 hingga 7 persen dari seluruh CO2 di seluruh dunia. Oleh karena itu, para peneliti mencoba mengembangkan gagasan tentangbeton ramah lingkungan, dengan mengurangi penggunaan semen dengan menggunakan bahan alternatif seperti silica fume. Silica fume adalah bahan pozzolan yang kaya akan silika dan dapat bereaksi kimia dengan kalsium hidroksida, membentuk gel kalsium silikat (CSH) pada beton. Tujuan dari penelitian ini adalah untuk menyelidiki pengaruh silica fume sebagai pengganti parsial semen terhadap nilai resapan dan kekuatan tekan mortar. Persentase silica fume bervariasi 0%, 5%, 10%, 12% dan 15%. Hasil pengujian menunjukkan nilai resapan minimum adalah 3,276% diperoleh campuran dengan 15% silica fume dan kuat tekan maksimum 312,574 kg/cm2 diperoleh campuran dengan 8% silica fume.Kata kunci: silica fume, nilai resapan, kuat tekan, mortar ABSTRACTConcrete and mortar are widely used as contruction materials. The increasing demand of concrete and mortar also increase the demand of cement in the market which has negative impact for environment. The cement industry produced for approximately 6 to 7 percent of all CO2 worldwide. Therefore, the researches try to develop the idea of green concrete with reducing the utilize of cement with using the alternative materials such as silica fume. Silica fume is a pozzolanic material that contain rich of silica and has chemical reaction with calcium hydroxide forming calcium silicate hydrate (C-S-H) gel in concrete.The aimed of this research is to investigate the influence of silica fume as partial replacement of cement on absoption and compressive strength of mortar.The percentage of silica fume were varied from 0%, 5%, 10%, 12% and 15%. The test result showed that the minimum absorption value is 3.276% obtain from the mixture with 15% of silica fume and the maximum compressive strength is 312.574 kg/cm2 obtain from the mixture with 8% of silica fume.Keywords: Silica fume, absorption, compressive strength, mortar
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Muhammed, N., L. Shihab, and S. Sakin. "Ultimate Load of Different Types of Reinforced Self-Compacting Concrete Columns Attacked by Sulphate." Civil Engineering Journal 8, no. 10 (October 1, 2022): 2069–83. http://dx.doi.org/10.28991/cej-2022-08-10-04.
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In this study, the effects of the partial immersion of sulphate attack on the ultimate load capacity of reinforced self-compacting concrete (SCC) columns and the sulphate attack resistance improvement using silica fume, steel fibres, and the combination of silica fume and steel fibres were assessed. Twelve short circular self-compacting reinforced concrete columns (0.150 m in diameter and 0.7 m long) were cast and divided into groups according to (1) the three acid-attack groups. The first group was tested without an acid attack (control). The second group was tested after 1 month of exposure to 2% acid. The final group was tested after 1 month of exposure to 4% acid and was then (2) subdivided according to the type of casted concrete. The first group was cast with SCC. The second group was cast with SCC and silica fume (0.1% of the cement weight). The third group was cast with SCC and 1% volume fraction steel fibres. The fourth group was cast with SCC silica fume and 1% volume fraction steel fibre. All columns were tested by axial loading. The ultimate load was increased by 42% with silica fume, 190% with steel fibres, and 238% with silica fume and steel fibres. Exposure to 2% and 4% acid reduced the ultimate loads of the columns casted with SCC by 23% and 47%, the columns casted with SCC and silica fume by 34% and 37%, the columns casted with SCC and steel fibres by 69% and 78%, and the columns casted with SCC, silica fume, and steel fibres by 72% and 79%, respectively. Based on the results, using silica fumes improved sulphate resistance, and using steel fibres enhanced sulphate resistance at an acceptable ratio. Furthermore, the mix with silica fume and steel fibres improved sulphate resistance at a good ratio. We encountered several problems in this study. The partial immersion of sulphate affected the strain in both concrete and steel. Future studies using different immersion ratios are recommended. Doi: 10.28991/CEJ-2022-08-10-04 Full Text: PDF
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Şenol, Ahmet, and Arzu Guner. "Use of Silica Fume, Bentonite, and Waste Tire Rubber as Impermeable Layer Construction Materials." Advances in Civil Engineering 2023 (January 17, 2023): 1–12. http://dx.doi.org/10.1155/2023/7301343.
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To avoid the potential risks associated with all hazardous wastes, it is important that containment methods are intended to prevent the migration of liquid hazardous wastes or leaks containing hazardous components. Therefore, impermeable barriers were used to prevent contamination. In this study, geotechnical tests were performed on samples by mixing rubber and bentonite with silica fume at certain percentages. The aim of the experimental studies is to evaluate the applicability of certain proportions of silica fume, rubber, and bentonite mixtures as impermeable liner material. Possible cracks in bentonite during drying are reduced by the use of silica fume. Absorption of dynamic effects that may occur on the impermeable barrier layer is achieved by adding waste rubber in a uniform size. Several geotechnical tests were performed to examine the mixed rubber and bentonite with silica fumes. Looking at the results of the whole that mixed rubber and bentonite with silica fume yielded usable results and a blend for construction of a liner.
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Lin, Dong, and Zi Yun Wen. "Research on the Efficient Application of Silica Fume in High-Tech Cement-Based Materials." Advanced Materials Research 374-377 (October 2011): 1537–40. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1537.
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The comparison experiments are carried out at different silica fume dosage between the silica fume with pre-treatment and the silica fume without pre-treatment. The results show that the pre-treatment of silica fume improved the strength greatly and the silica fume dosage corresponding to the strength peak somewhat moved forward from 0.20 for the cement-based materials with pre-treatment of silica fume to 0.21 for the cement-based materials without pre-treatment of silica fume. The particles distribution experiment results indicate that after the pre-treatment of silica fume, the average particle diameter of silica fume reduced from 2.865μｍto 0.151μｍ. Based on Aim-Goff model, it is concluded that the increase in the compressive strength and flextural strength of cement-based materials with pre-treatment of silica fume, are attributed to the dispersion of silica fume agglomeration and the increase in the packing density of the cement-based materials.
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Shao, Di, Jianzhi Diao, Lijie Wang, and Long Li. "Effect of surface modification on the compressive properties of silica fume/polyurethane composites." Journal of Polymer Engineering 36, no. 8 (October 1, 2016): 847–52. http://dx.doi.org/10.1515/polyeng-2015-0475.
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Abstract Silica fume was modified by a silane coupling agent (KH-550). The modified silica fume was further investigated to reinforce polyurethane (PU) composites. Unmodified and modified silica fume reinforced PU composites were prepared. Through the comparisons of Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) of unmodified and modified silica fume, the agglomerations of silica fume particles were effectively prevented as KH-550 was grafted. The compressive strength of the modified silica fume/PU composites was largely improved, because KH-550 could react with both silica fume and PU. Meanwhile, modified silica fume turned from hydrophilic to hydrophobic; a better dispersion was realized in the PU elastomers compared to the unmodified silica fume. The reinforcement effects were evaluated based on the results of a universal test machine in comparison with unmodified silica fume/PU composites.
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Jin, Zu Quan, Peng Zhang, Tie Jun Zhao, and Bao Rong Hou. "Study on Ultra-Strength Mortar Prepared with Mineral Admixture." Materials Science Forum 675-677 (February 2011): 1073–76. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.1073.
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In this paper, preparation, property study of ultra-strength mortars with mineral admixture and clear river sand was carried out. The mineral admixture include fly ash, ultra-fine GGBS and silica fume. The experimental results show that the compressive strength of mortar improves with increasing amount of silica fume or ultra-fine GGBS. When the content of silica fume or ultra-fine GGBS is 30~35%, the compressive strength and flexural strength of mortar in curing age of 7 days are 100 MPa and 20MPa, respectively. But strength of mortar decreases with the increase replacement rate of fly ash. When the mortar mixes with combined of silica fume and ultra-fine GGBS, the optimum proportion of siliaca fume to ultra-fine GGBS is 2:3. And the compressive strength of mortar in curing age of 7 days is 75~100MPa when the mixed mineral admixture is 40~60%. The compressive strength of mortar is about 90MPa as it mix 60% of cement, 15% of silica fume, 15% of GGBS and 10% of fly ash. Moreover, the ultra strength mortar refines its pore structure and its capiliary pore (≥100nm) amount reduces by 78% compared to ordinary mortar.
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Pasulu, Andika, Jonie Tanijaya, and Desi Sandy. "Penggunaan Silica Fume Sebagai Substitusi Semen Dengan Bahan Tambah Abu Pecahan Karang Pada Beton." Paulus Civil Engineering Journal 5, no. 1 (March 27, 2023): 8–18. http://dx.doi.org/10.52722/pcej.v5i1.586.
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Silica Fume merupakan material pozzolan yang sangat halus, dimana mengandung komposisi silika lebih banyak dari sisa produksi silicon atau alloy besi silikon. Silica fume yang digunakan berbentuk bubuk sebagai substitusi semen. Penelitian ini bertujuan untuk mengetahui pengaruh persentase yang menggunakan silica fume sebagai substitusi semen dengan bahan tambah abu pecahan karang terhadap kuat tekan, kuat tarik belah dan modulus elastisitas beton. Penelitian ini metode SNI (f’c) 30 MPa dan sampel bentukan silinder dimensi 150 mm x 300 mm. Berdasarkan hasil penelitian yang didapatkan, variasi Silica fume 9% dan Abu Pecahan Karang 0%, 5%, 7,5%, 10% diperoleh nilai kuat tekan umur 28 hari berturut turut adalah 30,951 MPa, 32,744 MPa, 31,989 MPa, dan 31,423 MPa, hasil uji kuat tarik belah sampel sebesar 3,161 MPa, 3,397 MPa, 3,491 MPa, dan 3,303 MPa, hasil modulus elastisitas sebesar 28233,7885 MPa, 33486,8743 MPa, 32409,6667 MPa, dan 30350,5834 Mpa. Dari hasil penelitian penggunaan silica fume dan abu pecahan karang pada beton dapat mempengaruhi kekuatan beton, dimana nilai didapatkan bervariasi. Kuat tekan dan modulus elastisitas maksimum pada variasi 5% dan kuat tarik belah maksimum pada variasi 7,5%.
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Torres-Ortega, Ramón, Edgar Quiñonez-Bolaños, Candelaria Tejada-Tovar, Yineth García-Díaz, and Ibeth Cabarcas-Torres. "High-strength Concrete with Natural Aggregates, Silica Fume, and Polypropylene Macrofibers." Ciencia e Ingeniería Neogranadina 31, no. 2 (December 31, 2021): 27–40. http://dx.doi.org/10.18359/rcin.4394.
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The use of concrete with polypropylene macrofibers can reduce the fragility and shrinkage of silica fume mixtures. Here, we investigated the effect silica fumes and aggregates have on enhancing high-performance concrete with polypropylene macrofibers. Three dosages of polypropylene macrofibers were evaluated (0.39, 0.63, and 0.79 % volume fraction), including silica fume (0.0 and 7.0 % water-cement), for two types of coarse aggregate (limestone and river gravel), with two maximum nominal sizes of coarse aggregate. In total, 96 concrete specimens were subjected to compression and bending tests to evaluate the effect of adding fiber, silica fume, and different aggregate types. The results showed a resistance to compression between 36 and 71 MPa, and that to flexural strengths of 3.6 to 5.8 MPa, which indicates high-performance concrete. The work shows that it is possible to achieve high-strength concrete with 55 mm polypropylene macrofibers combined with silica fumes and natural aggregates of both the limestone and calcareous types, which is beneficial for the local production of high-performance concrete.
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Wang, Xiao Jun, Xiao Yao Wang, Hong Fei Zhu, and Xiao Ye Cong. "The Change of Silica Tetrahedron in Cement-Silica Fume Blends Hydration." Materials Science Forum 743-744 (January 2013): 280–84. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.280.
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The change of silica tetrahedron in cement-silica fume blends hydration is critical for blended cement application. 29Si solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) investigations on the change of silica tetrahedron, which were Portland cement hydration, silica fume in simulated hydration and cement-silica fume blends hydration, were characterized and compared in this paper. The experimental results revealed that the amorphous silica tetrahedron structure in silica fume changed into Q1 and Q2 silica tetrahedrons, the same as silica-oxide structure of cohesive gel in the hydration of Portland cement. The coexistence of Q1 and Q2 silica tetrahedron in hydration product was beneficial to the strength increase of blend paste with silica fume. The amount of Q2 silica tetrahedron in cement-silica fume blends was higher than that in Portland cement. The pozzolanic reaction of silica fume accelerated the course of the silica tetrahedron in blended paste turning into the stable state of Q2 silica tetrahedron and existing principally in blended paste. That is reason that the physical properties of cement-silica fume blends are better than those of Portland cement.
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Marti-Montava, Felipe, Ann Opsommer, and David Garcia-Sanoguera. "Influence of Silica Fume Source on Crystallization of Xonotlite in a New Process Making Medium Density Ca-Silicate Based Products." Key Engineering Materials 788 (November 2018): 3–12. http://dx.doi.org/10.4028/www.scientific.net/kem.788.3.
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This paper investigates the influence of different types of silica fume on the crystallization process of medium density calcium silicate based products. The products are formed by a new technology that consists of two steps. In the first step, a mixture containing calcium silicate hydrates (C-S-H) is formed by reaction of lime with special silicas at temperatures below 100°C. This mixture is then molded into boards by a filter-pressing technique. In the second step, the boards are treated in hydrothermal conditions enabling the conversion of the C-S-H into important contents of xonotlite (Ca6Si6O17(OH)2); this is the most stable calcium silicate hydrate phase at high temperatures. In order to make C-S-H in pressure less conditions, the use of reactive forms of silica is required. In this work we used silica fume as reactive silica. To understand the influence of the silica fume on the formation of xonotlite, several properties were studied, such as particle size, purity and specific surface area (BET). It was found that the particle size distribution and degree of agglomeration for the silica fume were the most important properties. A proper dispersion technique must be applied in order to break the silica fume agglomerates, forming particles small enough to react with dissolved lime and to form C-S-H phases that are able to be converted into xonotlite under hydrothermal conditions. Finally, it was also found that the formation of xonotlite is favored by the use of high purity silica fume.
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Sun, Shan, Xue Qing Liu, and Ji Yan Liu. "Comparative Study of Different Source of Silica-Filled Epoxy Resin." Advanced Materials Research 631-632 (January 2013): 205–8. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.205.
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The mechanical properties and morphologies of fume precipitate and rice husk silica filled EP composites have been compared. The density, specific area of the silica decreases in the order of fume silica, precipitate silica and rice husk silica, while the silica size increases with the order above. It is shown that the fume silica/EP exhibits the highest flexural strength and modulus, followed by the precipitate silica/EP and the rice husk silica/EP. The rice husk silica/EP exhibits the highest in impact strength as silica is 1 phr. Over 5 phr of silica, fume silica/EP has the highest in impact strength, while the rice silica/EP is better than precipitate silica/EP. Scanning electron microscopy (SEM) results show that the fume silica has best dispersion and least filler agglomerates in matrix. The better dispersion will be responsible for the higher reinforcing and processing viscosity of the fume silica.
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He, Juan, Congmi Cheng, Xiaofen Zhu, and Xiaosen Li. "Effect of Silica Fume on the Rheological Properties of Cement Paste with Ultra-Low Water Binder Ratio." Materials 15, no. 2 (January 12, 2022): 554. http://dx.doi.org/10.3390/ma15020554.
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The effect of silica fume on the rheological properties of a cement–silica fume–high range water reducer–water mixture with ultra-low water binder ratio (CSHWM) was studied. The results indicate that the W/B ratio and silica fume content have different effects on the rheological parameters, including the yield stress, plastic viscosity, and hysteresis loop area. The shear-thickening influence of CSHWM decreased with the increased silica fume content. When the silica fume content increased from 0% to 35%, the mixture with W/B ratio of 0.19 and 0.23 changed from a dilatant fluid to a Newtonian fluid, and then to a pseudoplastic fluid. When the silica fume content was less than 15%, the yield stress was close to 0. With the increase of silica fume content, the yield stress increased rapidly. The plastic viscosity and hysteresis loop area decreased slightly with the addition of a small amount of silica fume, but increased significantly with the continuous increase of silica fume. Compared with the Bingham and modified Bingham models, the Herschel–Buckley model is more applicable for this CSHWM.
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Ashad, Hanafi, Guntur Walinono Saputra Billa, and Salwa Chastisa Supri. "Persamaan Konstitusif Beton Menggunakan Beton Daur Ulang sebagai Agregat Kasar dengan Additive Silica Fume." Jurnal Teknik Sipil MACCA 4, no. 1 (February 28, 2019): 41–53. http://dx.doi.org/10.33096/jtsm.v4i1.360.
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Saat ini dengan meningkatnya penggunaan beton, maka meningkat pula limbah yang dihasilkan dari penggunaan beton itu sendiri. Penggunaan beton daur ulang merupakan salah satu usaha untuk mengurangi dampak perusakan lingkungan yang disebabkan oleh limbah beton. Penelitian ini menggunakan beton daur ulang sebagai agregat kasar dengan penambahan silica fume, untuk mengetahui efek dari penambahan silica fume terhadap kuat tekan dan modulus elastisitas pada beton normal. Adapun variasi silica fume yang digunakan pada penelitian ini ialah 0%, 5%, 10% dan 15% terhadap berat semen yang digunakan. Kuat tekan dan modulus elastisitas diuji pada umur 28 hari. Hasil pengujian kuat tekan variasi 0% sebesar 21,14 MPa, variasi 5 % sebesar 24,16 Mpa, variasi 10% sebesar 26,80 MPa, dan variasi 15 % sebesar 24,72 MPa. Untuk hasil pengujian modulus elastisitas , variasi silica fume 0% sebesar 24158,84 MPa, silica fume 5 % sebesar 25690,63 MPa, silica fume 10 % sebesar 26299,05 MPa dan silica fume 15 % sebesar 24705,10 MPa. Penggunaan silica fume optimum yang menghasilkan kuat tekan maksimum terdapat pada variasi silica fume 10,11 % dengan kuat tekan yaitu 26,14 MPa.
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Wu, Xiaowei, and Zhaoxi Tang. "Influence of Silica Fume on the Performance of Moderately Weathered Phonolite Concrete." E3S Web of Conferences 293 (2021): 02032. http://dx.doi.org/10.1051/e3sconf/202129302032.
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The effect of silica fume on the performance, mechanical properties, durability and air tightness of airtight concrete was studied. The results showed that with the increase of silica fume content, the concrete performance will decrease, the compressive strength of airtight concrete will increase first, and reach the highest when the silica fume content was 8%, and then it will decrease gradually. With the increase of silica fume content, the corrosion resistance coefficient of concrete increased gradually, then decreased. The permeability coefficient of concrete decreases with the increase of silica fume content, and the air tightness of concrete was improved obviously; In the project, it was advisable to use silica fume to prepare airtight concrete, and the amount of silica fume should be controlled at 4% - 8%.
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Wang, Fu Hua, and Sen Li. "Effect of Silica Fume on Workability and Water Impermeability of Concrete." Applied Mechanics and Materials 238 (November 2012): 157–60. http://dx.doi.org/10.4028/www.scientific.net/amm.238.157.
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A designed experimental study has been conducted to investigate the effect of silica fume on workability and water impermeability of concrete, a large number of experiments have been carried out in this study. The results indicate that the addition of silica fume has adverse effect on the workability of concrete composite. The slump and flowability of the concretes containing silica fume is less than that of the concrete without silica fume, and a considerable decrease for the slump and flow of the concrete was observed by increasing the dosage of silica fume. Besides, the addition of silica fume can improve the water impermeability of the concrete composite evidently, and the water impermeability is becoming better and better as the silica fume content is increasing gradually.
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Li, Feng, and Zai Peng Cui. "Effect of Silica Fume on Dry Shrinkage and Freezing-Thawing Durability of Concrete." Applied Mechanics and Materials 238 (November 2012): 165–68. http://dx.doi.org/10.4028/www.scientific.net/amm.238.165.
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An experimental study has been conducted to investigate the effect of silica fume on shrinkage and freezing-thawing durability of concrete, a large number of tests have been carried out in this study. The results indicate that the addition of silica fume has adverse effect on the dry shrinkage property of concrete. The dry shrinkage strain of the concrete containing silica fume is more than that of the concrete without silica fume, and a considerable increase for the dry shrinkage strain of the concrete was observed by increasing the dosage of silica fume. However, the addition of silica fume can improve the freezing-thawing durability of the concrete evidently, and the freezing-thawing durability is becoming better and better as the silica fume content is increasing gradually.
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Wongkeo, W., W. Thawornson, and Arnon Chaipanich. "Microstructure and Characterizations of Portland-Bottom Ash-Silica Fume Cement Pastes." Advanced Materials Research 55-57 (August 2008): 629–32. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.629.
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This research investigated the microstructure and characterization of Portland-bottom ash-silica fume cement pastes. Bottom ash, a by – product from coal-fired thermal power plants, was obtained from Mae Moh power plant, Lampang, Thailand. It currently exists as waste approximately 1.5 MT per year and has not been put to use. Unlike its counterpart, fly ash, which is recognized as an alternative material used to replace part of Portland cement. Silica fume, a nanomaterial from ferrosilicon industry, is nanoparticle and highly amorphous. It is highly pozzolanic reaction and could improve properties of Portland-bottom ash cement pastes. Thus, this research investigated the effect of silica fume on microstructure and characterization of Portland-bottom ash-silica fume cement pastes. The ratios of bottom ash used to replace Portland cement were 0, 10, 20 and 30 percent by weight and silica fume was added at 5 and 10 percent by weight. Compressive strength test was then carried out. SEM and TGA were used to study the microstructure of Portland-bottom ash-silica fume cement pastes. The results show that, the compressive strength of Portland-Bottom ash-silica fume cement pastes increased with added silica fume at 5 and 10 percent. SEM micrographs show C-S-H gel and silica fume around the cement particle in Portland-bottom ash-silica fume cement pastes which gives a highly dense and less porous microstructure. TGA graphs show Ca(OH)2 decreased with silica fume content.
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HERMANN, A., E. A. LANGARO, S. H. LOPES DA SILVA, and N. S. KLEIN. "Particle packing of cement and silica fume in pastes using an analytical model." Revista IBRACON de Estruturas e Materiais 9, no. 1 (February 2016): 48–65. http://dx.doi.org/10.1590/s1983-41952016000100004.
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When added to concrete in appropriate content, silica fume may provide an increase in the mechanical strength of the material due to its high pozzolanic reactivity. In addition to the chemical contribution, physical changes can also be observed in concretes with silica fume due to an improvement in the particle packing of the paste. This is a result of their small size spherical particles, which fill the voids between the larger cement grains. However, it is necessary to properly establish the cement replacement content by silica fume, because at high amounts, which exceed the volume of voids between the cement particles, silica fume can promote the loosening of these particles. Thus, instead of filling the voids and increasing the packing density, the addition of silica fume will increase the volume of voids, decreasing the solid concentration. Consequently, this will impair the properties of the concrete. The objective of this paper is to use a particle packing analytical model, the CPM (Compressible Packing Model), to verify the maximum packing density of cement and silica fume, which could be associated with the silica fume optimum content in pastes. The ideal content of silica fume in pastes, mortars and concretes is usually experimentally determined. However, a theoretical study to contrast experimental data may help understanding the behaviour of silica fume in mixes. Theoretical results show maximum amounts of silica fume in the order of 18 to 20% of the cement weight, which is high considering recommendations on literature of 15%. Nevertheless, the packing model does not consider the effect of silica fume high specific surface on the agglomeration of particles or water demand. Hence, the packing density predicted by this model cannot be used as the single parameter in determining the optimum amount of silica fume in pastes.
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Prasetyo, Arnoldus Meidio Adi, and Ade Lisantono. "COMPRESSIVE AND SHEAR BOND STRENGTH OF OIL WELL CEMENT WITH CALCIUM CARBONATE AND SILICA FUME." Jurnal Teknik Sipil 13, no. 4 (February 10, 2017): 255. http://dx.doi.org/10.24002/jts.v13i4.933.
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One of the critical factors of cementing process in oil drilling of off-shore-project is designing the cement slurry. For this reason, the slurry properties which have been classified by American Petroleum Institute (API) should be changed so it will match with the requirement of reservoir condition. Changing the slurry properties can be done by adding the additive material into the cement slurry such as Calcium Carbonate and Silica Fume. The research objective is to study the effect of calcium carbonate and silica fume to the compressive and shear bond strength of oil well cement. Fourty five cylinder specimens with the size of (75 x 150) mm were made for compressive strength testing and fourty five cylinder specimens with the size of (25.4 x 50.8) mm were made for shear bond strength testing. Five variants of the specimen were made in this study. The variant were cement slurry with (0% Calcium Carbonate + 0 % Silica Fume) as a reference specimen; (5% Calcium Carbonate + 5 % Silica Fume); (10% Calcium Carbonate + 10 % Silica Fume); (15% Calcium Carbonate + 15 % Silica Fume); (20% Calcium Carbonate + 20 % Silica Fume). The oil well cement specimens were tested in 7, 14, and 28 days. The experimental results show that the compressive strength of oil well cement will decrease when it is added with calcium carbonate and silica fume. The shear bond strength of the oil well cement increases for the specimen with 5 % Calcium Carbonate + 5 % Silica Fume. However, the shear bond strength will decrease when content of the Calcium Carbonate + Silica Fume more than 5 %. Based on the result of this research, the optimum amount of calcium carbonate and silica fume that can be use is 5%, because with 5% of calcium carbonate and 5% of silica fume, the reducing of compressive strength is the smallest and the shear bond strength is increased compare to the others specimen with 10%, 15%, and 20% calcium carbonate and silica fume.
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Gudmundsson, Gisli, and Hakon Olafsson. "Alkali-silica reactions and silica fume." Cement and Concrete Research 29, no. 8 (August 1999): 1289–97. http://dx.doi.org/10.1016/s0008-8846(98)00239-7.
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Li, Ong Huey, Liew Yun-Ming, Heah Cheng-Yong, Ridho Bayuaji, Mohd Mustafa Al Bakri Abdullah, Foo Kai Loong, Tan Soo Jin, et al. "Evaluation of the Effect of Silica Fume on Amorphous Fly Ash Geopolymers Exposed to Elevated Temperature." Magnetochemistry 7, no. 1 (January 6, 2021): 9. http://dx.doi.org/10.3390/magnetochemistry7010009.
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The properties of amorphous geopolymer with silica fume addition after heat treatment was rarely reported in the geopolymer field. Geopolymer was prepared by mixing fly ash and alkali activator. The silica fume was added in 2% and 4% by weight. The geopolymer samples were cured at room temperature for 28 days before exposed to an elevated temperature up to 1000 °C. The incorporation of 2% silica fume did not cause significant improvement in the compressive strength of unexposed geopolymer. Higher silica fume content of 4% reduced the compressive strength of the unexposed geopolymer. When subjected to elevated temperature, geopolymer with 2% silica fume retained higher compressive strength at 1000 °C. The addition of silica fume in fly ash geopolymer caused a lower degree of shrinkage and expansion, as compared to geopolymer without the addition of silica fume. Crystalline phases of albite and magnetite were formed in the geopolymer at 1000 °C.
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Wang, Xiao Jun, Xiao Yao Wang, Hong Fei Zhu, and Chen Qian. "29Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration." Key Engineering Materials 539 (January 2013): 1–4. http://dx.doi.org/10.4028/www.scientific.net/kem.539.1.
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As the major structure of silica fume, the change of silica tetrahedron in the pozzolanic reaction during the hydration has not been revealed clearly in previous studies. In this study, 29Si solid-state MAS NMR was used to characterize the silica tetrahedron change of the silica fume in saturated alkali solution with 0.9, 1.2, 1.5 and 1.8 four different calcium/silica ratios. The amorphous Q4 silica tetrahedron structure in silica fume changed into Q1 silica tetrahedron at 1 day. Q2 silica tetrahedron formed from Q1 silica tetrahedron within 3 days. Q1 and Q2 silica tetrahedron reached a balance until silica fume completed pozzolanic reaction and the Q4 silica tetrahedron exhausted. The coexistence of Q1 and Q2 silica tetrahedron benefited the physical properties increase of cementitious system. 29Si solid-state MAS NMR results proved that the chain length of silica tetrahedron in C-S-H shortened in the silica fume hydration while the C/S ratio increased.
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Yin, Zhi Gang, Jun Feng, Shu You Huang, and Bing Fang Zhao. "Experimental Study of Frost-Resistance Properties of Silica Fume Concrete." Applied Mechanics and Materials 584-586 (July 2014): 1626–29. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1626.
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The frost resistance of low strength concrete is researched. In order to evaluate the effect of different content of silica fume on frost resistance，the quality of the cement 6%, 9%, 12% silica fume are respectively added into concrete. Freezing-thawing test results show that: the silica fume concrete has good frost resistance. Content of silica fume on concrete is not almost effect to quality loss rate. In 0-250 times of freezing-thawing cycle range, it is smaller that relative dynamic elastic modulus change rate. Relative dynamic elastic modulus of ordinary concrete decreases rapidly after 250 times of freezing-thawing cycle while dynamic elastic modulus decrease rate of the silica fume concrete tends to slow. The freezing -thawing cycles up to 350 times, silica fume concrete relative dynamic elastic modulus is 1.5 times that of ordinary concrete that show the silica fume concrete frost resistance is better than that of ordinary concrete.
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Thomas, MDA, K. Cail, and R. D. Hooton. "Development and field applications of silica fume concrete in Canada: a retrospective." Canadian Journal of Civil Engineering 25, no. 3 (June 1, 1998): 391–400. http://dx.doi.org/10.1139/l97-105.
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The effects of silica fume on the properties of plastic and hardened concrete are now fairly well-established. If properly used, silica fume imparts significant improvement to the strength and durability of concrete; and the availability of this material together with high-range water reducers (superplasticizers) has been largely responsible for the development of high-strength and high-performance concretes. Silica fume has been used in the Canadian cement and concrete industry for over 15 years. Early use was driven by economy, since concrete of a given strength grade could be produced at lower cementitious material content (and cost) if silica fume was incorporated in the mix due to the initial low selling price of the material. The construction boom of the mid to late 1980s saw the exploitation of high-strength silica fume concrete for high-rise construction. By the 1990s, concerns over the deteriorating infrastructure had shifted the focus to concrete durability and silica fume was finding applications in high-performance concrete. Today, silica fume is perhaps the material of choice for engineers designing concrete to withstand aggressive exposure conditions. This paper documents the major developments in the use of silica fume in Canada and discusses the wide range of applications for which the product may be used to beneficial effect.Key words: blended cement, Canada, concrete, high-performance, silica fume.
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Hadi, Nabaa S., Huda H. Awadh, and Amal H. Khalil. "Experimental Study for the Effect of Additives Silica Fume on the Properties of the Synthetically Contaminated Soil." Environmental Research, Engineering and Management 78, no. 1 (April 1, 2022): 46–56. http://dx.doi.org/10.5755/j01.erem.78.1.29869.
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This paper aims at studying the impact of the reaction that occurs between contaminants present in the soil and silica fume added on the chemical, physical and mechanical properties of the soil. The soil samples were contaminated in the laboratory with nickel nitrate (Ni(NO3)2). Silica fume (SF) was added to three different ratios (3%, 5%, and 10%). Several laboratory experiments were conducted to study soil characteristics before and after adding silica fume to the contaminated soil. The results revealed that the increment percentage of liquid and plastic limits was obtained with an increase in the percentage of silica fume additive to the nickel-contaminated soil. Notably, the maximum dried densities were decreased by increasing silica fume ratios to the nickel-contaminated soil, while the optimum water content increased with increasing silica fume ratios to the nickel-contaminated soil. The value of organic matter for soil samples was roughly equal numbers ranging from 3.33% to 4.07% (i.e., no change in the organic matter for soil samples mixed with different ratios of silica fume). The coefficient of consolidation (Cv) increased from 0.0026 in a soil sample that was contaminated with nickel ions at a concentration equal to 750 mg/kg without adding silica fume to 0.0755 in a soil sample contaminated with nickel ions at a concentration of 750 mg/kg mixed with silica fume at a ratio of 5% and then decreased to 0.00531 in a soil sample contaminated with nickel ions at a concentration of 750 mg/kg mixed with silica fume at a ratio of 10%.
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Fajrin, Jauhar, Pathurahman Pathurahman, and Lalu Gita Pratama. "APLIKASI METODE ANALYSIS OF VARIANCE (ANOVA) UNTUK MENGKAJI PENGARUH PENAMBAHAN SILICA FUME TERHADAP SIFAT FISIK DAN MEKANIK MORTAR." Jurnal Rekayasa Sipil (JRS-Unand) 12, no. 1 (April 1, 2016): 11. http://dx.doi.org/10.25077/jrs.12.1.11-24.2016.
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Penelitian yang berkaitan dengan penambahan bahan pozolan untuk memperbaiki mutu mortar atau beton sudah cukup banyak dilakukan. Namun demikian, penelitian-penelitian terdahulu umumnya dilakukan dengan menggunakan metode yang berbasis pada standar. Kelemahan metode ini adalah kesimpulan yang diambil hanya berdasarkan statistik deskriptif tanpa melibatkan proses pengujian hipotesis menggunakan statistik inferensial. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penambahan bahan pozolan silica fume terhadap karakteristik fisik dan mekanik mortar dengan mengaplikasikan metode analysis of variance (ANOVA). Metode yang digunakan dalam penelitian ini adalah metode eksperimen murni dimana percobaan laboratoriumnya didesain sebagai single factor experiment. Kesimpulan yang bisa diambil dari penelitian adalah: 1) Penambahan bahan pozolan silica fume mampu membuat mortar menjadi lebih kedap air yang ditandai dengan menurunnya daya serap air seiring dengan bertambahnya proporsi silica fume sebagai pengganti sebagian semen. Terjadi penurunan daya serap air sebesar 18,3% ketika mortar diberi tambahan silica fume sebesar 3% dari berat semen. Selanjutnya terjadi penurunan secara konstan sebesar 22,7%, 33,2% dan 35,2% ketika ditambahkan silica fume sebesar 5, 7 dan 10%. 2) Penambahan silica fume juga mampu menurunkan pH mortar. Tetapi pada penelitian ini, meskipun pH mortar menurun dengan bertambahnya proporsi silica fume, kondisi pH nya masih dalam keadaan basa yang relatif aman bagi tulangan yang dilindungi oleh mortar. 3) Untuk sifat mekanik, terlihat bahwa kuat tekan mortar berbanding lurus dengan peningkatan kandungan silica fume yang dicampurkan. Rata-rata kuat tekan mortar normal tanpa campuran silica fume adalah 39,9 MPa. Sementara kuat tekan rata-rata mortar dengan campuran silica fume secara berturut–turut adalah 40,4 MPa, 42,3 MPa, 43,2 MPa dan 45,1 MPa atau terjadi peningkatan kuat tekan berturut-turut sebesar 1,1%, 5,9%, 8,2%, dan 12,8 % untuk proporsi 3, 5, 7 dan 10%.Kata Kunci: mortar, silica fume, analysis of variance, karakteristik mortar, single factor analysis
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Singh, Amitoj, and Nitin Arora. "Impact of silica fume and PET fibre over the strength aspects of the concrete." IOP Conference Series: Earth and Environmental Science 1110, no. 1 (February 1, 2023): 012023. http://dx.doi.org/10.1088/1755-1315/1110/1/012023.
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Abstract In this exploratory research, PET fibre and silica fume were practised for the intensification of the commonplace concrete. PET fibre was practised at dissimilar proportions of 0%, 0.25%, 0.50%, 0.75%, 1.0%, 1.25% & 1.50%, while the silica fume was practised at 0%, 2.5%, 5.0%, 7.5%, 10.0%, 12.5% & 15.0%. for practising the research work in efficient manner purest form of both kinds of constituents were purchased from India-Mart and the physical and chemical composition details for both the constituents were provided by them. Then several samples were prepared depending upon proportion of PET fibre and proportion of the silica fume. Then all the samplings were examined for resistance against the compressive loads, resistance against the tensile loads, resistance against the flexural loads, quality of the PET fibre-Silica fume based modified concrete and its water absorption. The outcomes of the compressive load application test reveals that with the usage of the silica fume most significant value was attained at 15 % practice of the silica fume. Then this silica fume was utilized in combination with the PET fibre. In this particular case most, significant value was gotten at 15% practice of the silica fume and 1.25% of PET fibre. These kinds of outcomes were mainly attained due to the highly reactive nature of the silica fume and it reacts with the cement in a more reactive manner and leads to improved outcomes. The outcomes of the flexural loads and tensile loads application test were similar to the application of the compressive loads and the maximum value in both the cases were attained at 15% practice of the silica fume and 1.25 % application of the PET fibre. It was mainly due to the high tensile strength of both silica fume and PET fibre. The outcomes of the rebound hammer and UPV examination were similar and the best and optimum results were gotten at 15% practice of the silica fume and 1.25 % application of the PET fibre. These kinds of outcomes were mainly attained due to the highly reactive nature of the silica fume and it reacts with the cement in a more reactive manner and leads to improved outcomes.
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Vikas Srivastava, V.C. Agarwal, Atul, Rakesh Kumar, Rakesh Kumar, and P. K. Mehta. "Silica Fume – An Admixture for High Quality Concrete." Journal of Environmental Nanotechnology 2, (Special Issue) (January 11, 2022): 53–58. http://dx.doi.org/10.13074/jent.2013.02.nciset310.
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By addition of some pozzolanic materials, the various properties of concrerte viz, workability, durability, strength, resistance to cracks and permeability can be improved. Silica fume is one such pozzolanic material. Silica fume is a by product obtained from the reduction of high – purity quartz with coal or coke and wood chips in an electric arc furnace during the production of silicon metal or silicon alloys. The use of Silica fume as admixture in concrete has opened up one more chapter on the advancement in concrete technology. More sticky mix can be obtained by addition of Silica fume in concrete. Using Silica fume in concrete increases its compressive, tensile, flexural and impact strengths and decreases permeability and bleeding. In this paper, an attempt is made to describe the suitability of silica fume in concrete.
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Hendrawati, Nanik, Endah Dwi Rahmayanti, and Evi Dyah Priapnasar. "Study Pembuatan Durable Cement dengan Penambahan Pozzolan Silica Fume." Jurnal Teknik Kimia dan Lingkungan 2, no. 1 (April 29, 2018): 31. http://dx.doi.org/10.33795/jtkl.v2i1.68.
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Selama ini silica fume dikenal sebagai bahan campuran pembuatan beton karena dapat meningkatkan kuat tekan beton, menurunkan permeabilitas beton dan memiliki ketahanan sulfat yang tinggi. Dalam penelitian ini mencoba mengaplikasikan silica fume pada pembuatan durable cement. Silica fume dijadikan sebagai bahan pozzolan karena didalamnya mengandung silica tinggi yang bersifat reaktif agar dapat meningkatkan ketahanan terhadap sulfat. Bahan pozzolan ini dapat bereaksi dengan Ca(OH)2 pada suhu biasa untuk membentuk senyawa bersifat semen. Pada penelitian ini silica fume divariasikan mulai dari 0; 7,5; 15; 22,5; 30; 37,5%. Durable cement ini akan diuji ketahanan sulfatnya dengan menggunakan metode pengujian kuat tekan. Hasil percobaan menunjukkan terjadinya penururan nilai kuat tekan sampel pada umur 7 dan 28 hari jika dibandingkan dengan blanko. Hal ini disebabkan lambatnya reaksi pozzolan (silica fume). Namun proses peningkatan kuat tekannya akan terus berlanjut hingga setelah umur 360 hari. Jika dibandingkan dengan Standar Nasional Indonesia (15-0302-2004) semen PPC tipe IP-K, hasil sampel durable cement masih memenuhi standar untuk variabel dengan penambahan silica fume antara 7,5% sampai 22,5%. Silica fume is known as a mixture of concrete manufacturing since it can increase the compressive strength of concrete, decrease the permeability of concrete and have a high resistance to sulfates. In this research, try applying silica fume to make durable cement. Silica fume is converted to pozzolan because it contains highly reactive silica to increase sulfate resistance. This pozzolan material can react with Ca (OH)2 at a room temperature to form a cement compound. In this study, silica fume was varied from 0; 7.5; 15; 22.5; 30; 37.5%. The durable cement will be tested for its resistance to sulfates by using a compression resistance test method. The results showed that the compressive strength of the sample was decreased at 7 and 28 days compared to the blanks. This is due to the slow reaction of pozzolan (silica fume). But the process of increasing the resistance to compression will continue until after 360 days. Compared with Indonesia cement national standard (15-0302-2004) of PPC type IP-K, the durable cement sample still meets the standard for variables with the addition of silica fume between 7.5% and 22.5%.
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Nagataki, Shigeyoshi, and Asuo Yonekura. "Silica Fume and Concrete." Concrete Journal 23, no. 5 (1985): 5–15. http://dx.doi.org/10.3151/coj1975.23.5_5.
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A. Abul Ba, Hayder, Rana Thabet Abi, and Abdul Halim A. M. "Fume Silica Base Grease." Journal of Applied Sciences 8, no. 4 (February 1, 2008): 687–91. http://dx.doi.org/10.3923/jas.2008.687.691.
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Al-Oraimi, S. K., A. W. Hago, H. F. Hassan, and R. Taha. "Compressive Strength and Surface Absorption of High Strength Silica Fume Concrete Under Different Curing Conditions." Journal of Engineering Research [TJER] 4, no. 1 (December 1, 2007): 17. http://dx.doi.org/10.24200/tjer.vol4iss1pp17-22.
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The effect of curing conditions and silica fume replacement on the compressive strength and the initial surface absorption of high performance concrete is reported. The silica fume contents were 5, 10, 15 and 20%, by weight of cement. Four different curing conditions were used: air curing, control curing and two other curing conditions recommended by BS8110 and ACI308-81. The cementitious material (binder) content was constant (400 kg/m3); the water/cement (w/c) ratio was also maintained at a constant value of 0.35; while the water/binder (w/b) ratio ranged from 0.35 to 0.28. The addition of silica fume enhanced the compressive strength significantly up to 30%. The 28-day compressive strength was found to be 69.9 MPa without silica fume and it was determined to be 89.9 MPa with silica fume under the standard curing condition. The 28-day compressive strength results under the control curing condition were found to be higher than the compressive strength for specimens cured under other curing conditions. The surface absorption (ml/m2.s) was found to decrease as the percentage replacement of silica fume was increased. Control curing also decreases the surface absorption of water compared with air curing. Concrete with silica fume was less sensitive to drying than that without silica fume.
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Julmile, Elli Mercy, Frans Phengkarsa, and Suryanto Rapang Tonapa. "Pengaruh Silica Fume dan Pecahan Batu Marmer Sebagai Bahan Subtitusi Pada Campuran Beton." Paulus Civil Engineering Journal 5, no. 1 (March 27, 2023): 29–39. http://dx.doi.org/10.52722/pcej.v5i1.588.
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Tujuan penelitian untuk mengetahui pengaruh penggunaan silica fume dan pecahan batu marmer sebagai bahan subtitusi pada campuran beton pada kuat tarik belah, kuat lentur beton dan kuat tekan. Pengujian benda uji yakni kuat tarik belah, kuat lentur, dan kuat tekan. Pada penelitian ini direncanakan mutu beton yaitu 25 MPa.Dari hasil penelitian diperoleh nilai kuat tekan beton untuk variasi pecahan batu marmer sebesar 50% dan Silica Fume 0%, 10%, 12,5% dan 15% yaitu sebesar 25,175 MPa, 25,832 MPa, 24,606 MPa dan 24,229 MPa, pengujian kuat tarik belah untuk variasi pecahan batu marmer sebesar 50% dan Silica Fume 0%, 10%, 12,5% dan 15% adalah sebesar 1,886 MPa, 1,909 MPa, 1,862 MPa dan 1,815 MPa, uji kuat lentur untuk variasi pecahan batu marmer sebesar 50% dan Silica Fume 0%, 10%, 12,5% dan 15% yaitu sebesar 25,175 MPa, 25,832 MPa, 24,606 MPa dan 24,229 MPa. Pengaruh substitusi pecahan batu marmer sebagai agregat kasar sebesar 50% serta substitusi silica fume sebagai semen dengan variasi 0%, 10%, 12,5% dan 15% pada nilai kuat tekan, kuat tarik belah, dan kuat lentur beton didapatkan nilai maksimal subtitusi silica fume pada variasi 10% dan mengalami penurunan kekuatan diatas variasi silica fume 10%, makin tinggi persentase substitusi silica fume maka kekuatan beton makin rendah.
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Liu, Xinhui, Chunfeng Hu, and Longsheng Chu. "Microstructure, Compressive Strength and Sound Insulation Property of Fly Ash-Based Geopolymeric Foams with Silica Fume as Foaming Agent." Materials 13, no. 14 (July 19, 2020): 3215. http://dx.doi.org/10.3390/ma13143215.
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Geopolymer as an alternative to cement has gained increasing attention. The aim of this article is to study the influence of the silica fume content and activator type on the porous fly ash-based geopolymer with silica fume as foaming agent. Geopolymeric foams were fabricated using low-calcium fly ash, silica fume, and sodium-based alkaline activator as initial materials. The designed silica fume contents were 0, 15, 30, and 45 wt % and two kinds of activators of water glass and sodium hydroxide were used for comparison. Phase composition, microstructure, mechanical properties and sound insulation properties of as-prepared bulks were systematically investigated. It was found that, with increasing silica fume content, the density and compressive strength decreased simultaneously, whereas the porosity and sound insulation performance were effectively enhanced. At the silica fume content of 45% with sodium hydroxide as activator, the porosity was increased 3.02 times, and, at the silica fume content of 45% with water glass as activator, the mean sound insulation value of 43.74 dB was obtained.
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Prasertlar, Krit, and Krit Chaimoon. "Properties of Reactive Powder Concrete Using Densified Silica Fume." Applied Mechanics and Materials 405-408 (September 2013): 2928–32. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2928.
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This paper presents some experimental results on the physical and mechanical properties of reactive powder concrete (RPC) using two different characteristics of densified silica fume (f1 and f2). The silica fume/cement ratio (f/c) varied from 15% to 35% by weight. The flow, the micromorphology by scanning electron microscopy (SEM) and the compressive strength at the ages of 3, 7 and 28 days were studied. The effects of the silica fume agglomerations on the properties of the RPC were considered and discussed. The test results indicated that the properties of RPC depended on the type of silica fume, amount of silica fume and amount of superplasticizer used.
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Wang, Qing Long, and Jun Chao Bao. "Effect of Silica Fume on Mechanical Properties and Carbonation Resistance of Concrete." Applied Mechanics and Materials 238 (November 2012): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amm.238.161.
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A designed experimental study has been conducted to investigate the effect of silica fume on mechanical properties and carbonation resistance of concrete, a large number of experiments have been carried out in this study. The results indicate that the addition of silica fume has improved the compression strength and elastic modulus of concrete. A considerable increase for the compression strength and elastic modulus of the concrete was observed by increasing the dosage of silica fume. Besides, the addition of silica fume can improve the carbonation resistance of the concrete composite evidently, and the carbonation resistance is becoming better and better as the silica fume content is increasing gradually.
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Menéndez, Esperanza, Miguel Ángel Sanjuán, and Hairon Recino. "Study of Microstructure, Crystallographic Phases and Setting Time Evolution over Time of Portland Cement, Coarse Silica Fume, and Limestone (PC-SF-LS) Ternary Portland Cements." Crystals 13, no. 8 (August 21, 2023): 1289. http://dx.doi.org/10.3390/cryst13081289.
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The use of silica fume as a partial replacement for Ordinary Portland Cement provides a wide variety of benefits, such as reduced pressure on natural resources, reduced CO2 footprint, and improved mechanical and durability properties. The formation of more stable crystallographic phases in the hardened cement paste can promote resistance to concrete attacks. However, using coarse silica fume may result in lower expenses and shorter workdays. In this work, coarse silica fume was used as a partial replacement of cement, by weight, at 3%, 5%, and 7%, and it was used as limestone filler at different particle sizes. The size of coarse silica fume used was 238 μm. The microstructural, compositional analysis, and crystalline phase content of mixed cements at different ages were evaluated. The addition of coarse silica fume and limestone promoted pore refinement of the composites and increased the calcium and silica content. The filling effect of fine limestone and coarse silica fume particles, as well as the formation of CSH gel, was found to be the main reason for the densified microstructure. The contributions of combined coarse silica fume and limestone improve the stability of CSH gels and pozzolanic reaction.
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Liu, Xiao Hua, Xing Dong Lv, Jian Xia Fu, Peng Peng, and Guo Sheng Gai. "Application of Silica Fume in China." Advanced Materials Research 58 (October 2008): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amr.58.21.
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Silica fume is the dust recovered from the smoke released while smelting Si or Si-Fe alloy. The papers gives an overview of silica fume application in concrete, refractory, metallurgy and cement in China, along with some projects as examples; To contrast the situation at abroad, the producing, application, and price of silica fume in China was analyzed, and base on this predicted the future market. It is significant to promote deep research and application for silica fume.
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Wani, Absar Yousuf, and Mohit Bhandari. "Effect of Ground Granulated Blast Furnace Slag, Silica Fume and Nano Silica on the Strength & Durability Properties of Concrete: A Contemporary Review." IOP Conference Series: Earth and Environmental Science 889, no. 1 (November 1, 2021): 012007. http://dx.doi.org/10.1088/1755-1315/889/1/012007.
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Abstract This paper provides a contemporary review of the usage of Ground Granulated Blast-furnace Slag (GGBS), Silica Fume, and Nano Silica in Materialistic form over the deterministic aspects of conventional concrete. The main purpose of this literature learning is to enumerate the effect of GGBS, Silica Fume, and Nano Silica on strength of concrete. The GGBS, Silica Fume and Nano-silica is a restored substitute as compared to orthodox additives like CaCl2 and SiO2 because of their effectiveness with a lesser amount of consumption. It was found that the GGBS, Silica Fume, and nano-silica have an optimistic effect on the unconfined compressive strength, flexural strength, split tensile strength of concrete.
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Choi, Jeong-Il, Se-Eon Park, Huy Hoàng Nguyễn, Sang Lyul Cha, and Bang Yeon Lee. "Strain-Hardening and High-Ductile Behavior of Alkali-Activated Slag-Based Composites with Added Zirconia Silica Fume." Materials 12, no. 21 (October 27, 2019): 3523. http://dx.doi.org/10.3390/ma12213523.
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This paper presents an experimental study on the effects of zirconia silica fume on the composite properties and cracking patterns of fiber-reinforced alkali-activated slag-based composites. Four mixtures were prepared with added zirconia silica fume and varying water-to-binder ratio. Polyethylene fiber was used as a reinforcing fiber for all the mixtures at a volumetric ratio of 2.0% cubic specimens and uniaxial tensile specimens were prepared to evaluate their density, compressive strength, and tensile behavior. The test results demonstrated that the compressive strength, tensile strength, and tensile strain capacity of the composite can be simultaneously improved by incorporating zirconia silica fume. A mixture incorporating zirconia silica fume showed high-ductile behavior of 26.5% higher tensile strength, and 13.7% higher tensile strain capacity than the mixture without zirconia silica fume. The composite with added zirconia silica fume also showed excellent cracking patterns, i.e., narrow crack spacing and crack width.
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Sun, Qi, Tianlong Li, and Bing Liang. "Preparation of a New Type of Cemented Paste Backfill with an Alkali-Activated Silica Fume and Slag Composite Binder." Materials 13, no. 2 (January 13, 2020): 372. http://dx.doi.org/10.3390/ma13020372.
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A new type of cemented paste backfill (CPB) was prepared using sodium hydroxide (NaOH) as the activator, slag and silica fume (SF) as the binder, and tailings as the aggregate. The effects of proportion of replacement of 0%, 5%, 10%, 15%, and 20% silica fume on the properties of CPB were studied. The strength formation mechanism of CPB was explored through a combination of scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and Fourier transform infrared (FTIR) spectroscopy. The SEM images were analyzed by IMAGE J software, and the porosity of CPB with different silica fume contents was obtained. The results show that as the amount of silica fume increases, the unconfined compressive strength (UCS) increases first and then decreases. When the amount of silica fume was approximately 5%, CPB with a larger UCS can be obtained. When the silica fume content increased from 0% to 5%, because silica fume has good activity and small particles, more calcium silicate hydrate (C–S–H) gels and Mg-Al type layered double hydrotalcites (LDHs) were generated in CPB, which made it denser and improved its strength compared with the non-silica fume group. C–S–H gels were the main source of CPB strength. With a further increase in the amount of silica fume, thaumasite produced inside of CPB, reducing the content of C–S–H gels. Moreover, due to the expansion of thaumasite, it is easy to generate a large number of micro cracks in CPB, which weakens the strength of CPB.
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Arivalagan, S. "Flexural behaviour of hybrid fibre (steel fiber and silica fume) reinforced self compacting composite concrete members." World Journal of Engineering 11, no. 4 (August 1, 2014): 323–30. http://dx.doi.org/10.1260/1708-5284.11.4.323.
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The present day world is witnessing the construction of very challenging and difficult civil engineering structures. Self-compacting concrete (SCC) offers several economic and technical benefits; the use of steel fiber extends its possibilities. Steel fiber acts as a bridge to retard their cracks propagation, and improve several characteristics and properties of the concrete. Therefore, an attempt has been made in this investigation to study the Flexural Behaviour of Steel Fiber Reinforced self compacting concrete incorporating silica fume in the structural elements. The self compacting concrete mixtures have a coarse aggregate replacement of 25% and 35% by weight of silica fume. Totally eight mixers are investigated in which cement content, water content, dosage of superplasticers were all constant. Slump flow time and diameter, J-Ring, V-funnel, and L-Box were performed to assess the fresh properties of the concrete. The variable in this study was percentage of volume fraction (1.0, 1.5) of steel fiber. Finally, five beams were to be casted for study, out of which one was made with conventional concrete, one with SCC (25% silica fume) and other were with SCC (25% silica fume + 1% of steel fiber, 25% silica fume + 1.5% of steel fiber) one with SCC (35% silica fume), and other were SCC (35% Silica fume + 1% of steel fiber, 35% Silica fume + 1.5% of steel fiber). Compressive strength, flexural strength of the concrete was determined for hardened concrete for 7 and 28 days. This investigation is also done to determine the increase the compressive strength by addition of silica fume by varying the percentage.
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Lin, Wei Ting, Ta Yuan Han, Yuan Cheih Wu, and Chin Cheng Huang. "Effect of Fiber Length on Impact Resistance of Fiber Cement-Based Composites Containing Silica Fume." Advanced Materials Research 586 (November 2012): 117–20. http://dx.doi.org/10.4028/www.scientific.net/amr.586.117.
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This study is aimed to evaluate the impact performance of cement-based composites which comprise steel fibers and silica fume in the mixes. Material variables include water-cementitious ratio, dosage of silica fume, steel fiber length and dosage. Test results indicate that the impact resistance increase with increasing fiber content and water-cementitious ratio, and with decreasing silica fume content. For a given volume fraction, short fiber performs better than its long counterpart in improving the impact performance. In addition, the combination of silica fume and fibers enhances better impact behavior than individual constituents of silica fume, due to reduced the crack formation and offer the toughness of cement-based composites under impact loadings.
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Liu, Jing, Wen Liu, Shugang Guan, Chao Guo, and and Xinguo Zheng. "Use of polypropylene fiber and silica fume modified concrete as a repair material." MATEC Web of Conferences 199 (2018): 07008. http://dx.doi.org/10.1051/matecconf/201819907008.
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Polypropylene fiber and silica fume were used to get high impermeability and cracking resistance concrete as a repair material. Results showed just incorporating fiber (without silica fume) had no obvious improvement on strength and impermeability of concrete. The usage of polypropylene fiber and silica fume together in concrete increased the compressive strength and caused a significant reduction in chloride permeability. The improvement of fiber and silica fume on concrete properties was attributed to both the anti-cracking effect from polypropylene fiber and densification reinforcement action to the interfacial transition zones of both fiber —matrix and aggregate—cement paste from silica fume. These properties made them suitable for certain applications such as concrete repairs.
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Mortazavi, Maryam, and Mojtaba Majlessi. "Evaluation of Silica Fume Effect on Compressive Strength of Structural Lightweight Concrete Containing LECA as Lightweight Aggregate." Advanced Materials Research 626 (December 2012): 344–49. http://dx.doi.org/10.4028/www.scientific.net/amr.626.344.
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The purpose of this paper is to evaluate the effect of silica fume on compressive strength of structural lightweight concrete, containing saturated LECA (Light Expanded Clay Aggregate) as lightweight aggregate (LWA). In experimental phase of study 120 cubic specimens (10*10*10) were made and cured. For every mix design, different cement percentages were replaced with silica fume, containing same amount of saturated LECA. The mixes incorporate 0%, 5%, 10%, 15%, 20%, 25% silica fume. Constant level of Water/Cement ratio (0.37) was considered. For each mix design 20 specimens were prepared and cured for 7, 14, 28, 42 days in standard 20 C water. Also 20 specimens with the same mix design of 0% silica fume as normal weight concrete were prepared and cured to compare the results. For these specimens LECA were replaced with same volume and size of sand. The testing results showed; increasing silica fume causes considerable increase in compressive strength. The rate of strength gain slows down at high percentage of silica fume. Also silica fume leads concrete to get higher initial compressive strength at certain time compared with normal weight concrete.
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Cong, Xiao Hong, Bin Xue, Jing Sun, and Xiao Wei Sun. "Experiment and Research on the Influence of Mineral Admixture on Cement-Based Material Performance." Applied Mechanics and Materials 174-177 (May 2012): 1446–49. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1446.
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Cement mortar as the basic material and the fly ash and silicon fume as the research object, experiment and research were operated through adjusting the admixture replacing dosage and changing the mixture ratio of silica fume and fly ash. By testing the fluidity and strength and data analysis and discussion, some conclusions are drawn from the analysis, such as: fly ash makes the fluidity increasing with the admixture replacing dosage below 30%, and the fluidity declines with the mixture ratio of silica fume and fly ash increasing. 7d compressive strength decreases with the admixture replacing dosage increasing, 7d compressive strength increases slowly with the mix ratio of silica fume and fly ash. With the mix ratio of silica fume and fly ash increasing, 28d compressive strength of mortar also increases, and proper mix ratio of silica fume and fly ash is 1:1.