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Добірка наукової літератури з теми "SILICA FUMES"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "SILICA FUMES"

Liu, Hanbing, Guobao Luo, Longhui Wang, Wensheng Wang, Wenjun Li, and Yafeng Gong. "Laboratory Evaluation of Eco-Friendly Pervious Concrete Pavement Material Containing Silica Fume." Applied Sciences 9, no. 1 (December 26, 2018): 73. http://dx.doi.org/10.3390/app9010073.

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Pervious concretes, such as sustainable pavement materials, have great advantages in solving urban flooding, promoting urban ecological balance, and alleviating urban heat island effect, due to its special porous structure. However, pervious concrete typically has high porosity and low strength. The insufficient strength and poor freeze-thaw durability are important factors that restrict its wide application, especially in seasonal frozen areas. Improving the strength and freeze-thaw resistance of pervious concrete will expand its application. Silica fumes, as an industrial by-product waste and supplementary cementitious material, play an important role in improving concrete performance. The objective of this paper was to study the effects of silica fumes on properties of sustainable pervious concrete. Silica fumes were used to replace cement with the equivalent volume method at different levels (3%, 6%, 9%, and 12%). The control pervious concrete and silica fume-modified pervious concrete mixtures were prepared in the lab. The porosity, permeability, compressive strength, flexural strength, and freeze-thaw resistance properties of all mixtures were tested. The results indicated that the addition of silica fumes significantly improved the strength and freeze-thaw resistance of pervious concrete. The porosity and permeability of all pervious concrete mixtures changed little with the content of silica fumes due to the adoption of the equal volume replacement method.

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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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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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Jiang, Chaohua, Xiaobin Zhou, Shanshan Huang, and Da Chen. "Influence of polyacrylic ester and silica fume on the mechanical properties of mortar for repair application." Advances in Mechanical Engineering 9, no. 1 (January 2017): 168781401668385. http://dx.doi.org/10.1177/1687814016683856.

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Experimental investigations on the influence of different amounts of polyacrylic ester and silica fumes on the mechanical properties of mortar such as the compressive strength, splitting tensile strength, bonding strength, and abrasion resistance are presented in this article. The results show that the compressive and splitting tensile strength of mortar can be improved with the addition of polyacrylic ester and silica fumes. Results obtained from both the direct tensile bond test and flexural bond test indicate that the addition of polyacrylic ester and silica fumes improves the bond strength significantly, and the enhancement is more obvious with polyacrylic ester paste as interfacial adhesives. Furthermore, mortar incorporation of polyacrylic ester and silica fumes shows superior abrasion resistance compared to the control mortar. Therefore, the correct combination of polyacrylic ester and silica fumes to produce mortars has been shown to have synergistic effects, which results in excellent properties including high bond strength and superior abrasion resistance. Mortars containing polyacrylic ester and silica fumes are ideal for repairing concrete especially for hydraulic concrete structure.

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Meganadhan, Anand, Kavitha Sanjeev, and Mahalaxmi Sekar. "Influence of Silica Fumes on Compressive Strength and Wear Properties of Glass Ionomer Cement in Dentistry." Journal of Evolution of Medical and Dental Sciences 10, no. 20 (May 17, 2021): 1457–62. http://dx.doi.org/10.14260/jemds/2021/306.

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BACKGROUND Glass ionomer cements (GIC) are an interesting restorative option due to their biocompatibility. However, it has limitations that challenge its survival in oral environment due its porous set matrix influencing the properties of the cement. This study was conducted to evaluate the influence of the addition of varying concentrations of silica fumes (SF) on the properties of GIC by field emission scanning electron microscopy [FESEM] and energy-dispersive spectroscopy [EDX]. The final set matrix of GIC remains porous, compromising the mechanical properties, limiting its extended use clinically. Incorporation of silica fumes, a pozzolan, as an additive in GIC serves as a potential filler by increasing its compressive strength and reducing wear properties. METHODS The cement was divided into 5 groups based on the absence or presence of varying concentrations (0.5, 1, 1.5, 2 %) of silica fumes; conventional glass ionomer group (CG) (I) and 0.5, 1, 1.5, 2 silica fumes incorporated glass ionomer cement (SG) (II, III, IV & V) respectively. Compressive strength and wear resistance were subjected to Universal Testing Machine and Pin on Tribometer respectively. The microstructure and the elemental composition of prepared specimens of all the groups were evaluated using FESEM and EDX. Data obtained was analysed using Statistical Package for the Social Sciences (SPSS) V22.0 (IBM, USA) followed by one-way analysis of variance (ANOVA) and post hoc Tukey test (P < 0.05). RESULTS Except 0.5SG, increased compressive strength and decreased wear of glass ionomer material was observed as the concentration of silica fumes increased. Of all the concentrations, 2SG had significantly increased compressive strength (221.62 ± 22.84 MPa) compared to CG (167.38 ± 36.94 MPa) (P < 0.05). Significantly increased resistance to wear was noted in 2SG (11.80 ± 2.58 µm) compared to CG (20.40 ± 2.07 µm) (P < 0.05). The set matrix of silica fumes modified GIC showed minimal / absence of pores with dispersion of crystalline particles as the concentration of SF increased. EDX revealed similar constitution of minerals but, varied with increased concentration of silica fumes. CONCLUSIONS 2 % silica fumes incorporated glass ionomer cement (2SG) enhanced the properties of conventional glass ionomer cement. KEY WORDS Compressive Strength, EDX, Field Emission Scanning Electron Microscope, Glass Ionomer Cement, Silica Fumes, Pozzolan

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Sarsam, Saad I., and Ammar Khalaf Jabbar Allamy. "Fatigue Behavior of Modified Asphalt Concrete Pavement." Journal of Engineering 22, no. 2 (February 1, 2016): 1–10. http://dx.doi.org/10.31026/j.eng.2016.02.01.

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Fatigue cracking is the most common distress in road pavement. It is mainly due to the increase in the number of load repetition of vehicles, particularly those with high axle loads, and to the environmental conditions. In this study, four-point bending beam fatigue testing has been used for control and modified mixture under various micro strain levels of (250 μƐ, 400 μƐ, and 750 μƐ) and 5HZ. The main objective of the study is to provide a comparative evaluation of pavement resistance to the phenomenon of fatigue cracking between modified asphalt concrete and conventional asphalt concrete mixes (under the influence of three percentage of Silica fumes 1%, 2%, 3% by the weight of asphalt content), and (changing in the percentage of asphalt content) by (0.5% ±) from the optimum. The results show that when Silica fumes content was 1%, the fatigue life increases by 17%, and it increases by 46% when Silica fumes content increases to 2%, and that fatigue life increases to 34 % when Silica fumes content increases to 3% as compared with control mixture at (250 μƐ, 20°C and optimum asphalt content). From the results above, we can conclude the optimum Silica fumes content was 2%. When the asphalt content was 4.4%, the fatigue life has increased with the use of silica fumes by (50%), when asphalt content was 5.4%, the additives had led to increasing the fatigue life by (69%), as compared with the conventional asphalt concrete pavement.

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J, Anitha, and Srividya R S. "Experimental Investigation on performance of silica fumes as a soil stabilizer for oil contaminated strata." International Journal of Civil, Environmental and Agricultural Engineering 2, no. 1 (May 29, 2020): 1–16. http://dx.doi.org/10.34256/ijceae2011.

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Oil leakage is an environmental issue unnoticed in the present time. The problem of oil leakage and oil contamination is main concern for petroleum harvesting countries. Oil contamination in soil creates health issues in the area surrounding it. The nutrients in the soil get reduced significantly due to oil contamination which makes the land not suitable for cultivation. The oil produces hydrocarbons which makes the civil structures weak and out at risk. The most harmful effects of oil contamination are excessive settlement of structures, breakage of underground pipes, etc. In this project, we are trying to study the effects of oil contamination in the soil and also to find a sustainable solution for it. The soil is contaminated in the percentage from 0 to 20% and the tests on index and engineering properties have been conducted to find the effect of engine oil. In order to stabilize the oil contaminated soil, we use silica fumes as a stabilizing agent. The optimum percentage of silica fume is chosen based on the tests of Index and Engineering properties conducted on the soil with silica fumes. The percentage of oil where the soil properties need stabilization is known and the soil is stabilized with the optimum silica fume percentage.

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Vyas, Vishal, and Ranveer Singh Shekhawat. "Properties of Self Compacting Concrete Containing Silica Fume as a Sustainable Alternative: A Review." Current Journal of Applied Science and Technology 42, no. 15 (June 14, 2023): 1–11. http://dx.doi.org/10.9734/cjast/2023/v42i154121.

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The most frequently used building material on this planet is concrete. Concrete is the supreme user of natural resources as a result of its widespread use as construction material. Cement production produces significant amount of greenhouse emissions. The protection of environment has become challenging in many developing countries, 7-8% of CO2 is produced by the cement industry that causes huge damage to the environment. In concrete production, Silica fumes can be a partial alternative to cement. In this study, the properties of self-compacting concrete incorporating silica fumes are reviewed. Slump flow, funnel, L-box, compressive strength, split tensile strength and flexural strength are among qualities of self-compacting concrete with silica fumes that have been discussed in this study. The cement was replaced by silica fumes in the ratio of 0% to 30% in concrete, cement content can be reduced, which turns into an eco-friendly solution.

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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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Tanyildizi, Harun. "Prediction of the Strength Properties of Carbon Fiber-Reinforced Lightweight Concrete Exposed to the High Temperature Using Artificial Neural Network and Support Vector Machine." Advances in Civil Engineering 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/5140610.

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The artificial neural network and support vector machine were used to estimate the compressive strength and flexural strength of carbon fiber-reinforced lightweight concrete with the silica fume exposed to the high temperature. Cement was replaced with three percentages of silica fumes (0%, 10%, and 20%). The carbon fibers were used in four different proportions (0, 2, 4, and 8 kg/m3). The specimens of each concrete mixture were heated at 20°C, 400°C, 600°C, and 800°C. After this process, the specimens were subjected to the strength tests. The amount of cement, the amount of silica fumes, the amount of carbon fiber, the amount of aggregates, and temperature were selected as the input variables for the prediction models. The compressive and flexural strengths of the lightweight concrete were determined as the output variables. The model results were compared with the experimental results. The best results were achieved from the artificial neural network model. The accuracy of the artificial neural network model was found at 99.02% and 96.80%.

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Більше джерел

Дисертації з теми "SILICA FUMES"

Zakani, Behzad. "Rheological characterization of fumed silica lubricating greases." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63863.

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Lubricating greases have been widely used for rail lubrication systems. For an efficient grease pump design, it is important to study grease shear viscosity and it is also crucial to analyze grease yielding behavior to determine its consistency on rail surface. Among all rheological properties measured through experiments, yield stress is an ill-defined property, which investigation of a reproducible method for its determination can be invaluable. As the flow properties of a material will be usually influenced by the changes in environment temperature, studying the effects of temperature on the rheological properties of grease are important. In this study, different rheological measurements and visualization techniques, previously developed to study a wide range of materials, have been performed to characterize fumed silica based lubricating greases manufactured by L.B. Foster Rail Technologies Corp. Using commercial rheometers and different approaches to determine the yield points of these materials, it was revealed that the values obtained by curve fitting on steady-state flow curves, creep, amplitude sweep crossover and stress ramp-up were roughly similar. The microstructure of this grease was analyzed using Scanning Electron Microscope (SEM) on Cryo and non-Cryo modes. Besides visualizing a new thickener microstructure, it was shown that the heterogeneous structures developed by small fumed silica agglomerates lead to the formation of greases with higher shear viscosities. Finally, thermo-rheological analysis of these samples revealed that these materials follow neither Arrhenius equation nor time-temperature superposition principle.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate

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Brew, Daniel Robert Mitchell. "Impact of silica fume on cement performance." Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369734.

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Organic ion exchanger resin beads are widely used in nuclear waste technology for pond water cleanup. They accumulate radioactive Cs and Sr in service. For disposal, the beads are encapsulated in cement but their stabilisation in cement has been difficult to achieve. The ion exchangers uptake calcium and inbibe water, as a result of which they swell, cracking the cement. Nuclear Electric had previously commissioned work on non-swelling formulations. These consist of mixtures of sulfate-resisting Portland cement, calcium hydroxide and silica fume. However, concerns have been expressed about cement durability in contact with brines. This thesis had as part of its objectives, (i) determination of the probable stability of the non-swelling matrix in MgSO₄ brines and (ii) the corrosion potential of stainless steel in contact with the non-swelling cement. In addition, synthesis, characterisation work was performed on the reaction product of objective (i), M-S-H gel. Its alkali sorption capacity was determined as a function of both Mg/Si ratio and alkali concentration to assess its immobilisation potential.

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Pristavita, Ramona. "Transferred arc production of fumed silica : rheological properties." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99787.

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The thermal plasma production of fumed silica in a transferred arc consists of the decomposition of quartz to SiO (g) and oxygen followed by an oxidizing quench back to SiO2. The particles formed have diameters of the order of 10 to 20 nm and are linked in a three dimensional branched chain aggregate. Previous work by Addona and Munz (1999) demonstrated the technical feasibility of producing fumed silica using this method, but was unable to demonstrate the special rheological properties of the powder. The most important characteristic of fumed silica is the presence of hydroxyls on the surface of the particles, in the form of isolated hydroxyl groups, hydrogen-bonded hydroxyl groups and siloxane groups.
In the present work, we studied the changes in the powder quality by varying the quench conditions used for the production of the powder and by agglomerating the obtained particles. The fumed silica was agglomerated by conveying in a length of tubing with sharp bends. The powder was characterized using BET, Viscosity tests, FT-IR, TEM, SEM and XRD. The product was compared to both a commercial product (Aerosil 200) and the material previously produced by Addona. Tests were done before and after the agglomeration experiments.
The experimental results showed that the agglomeration had no effect on the powder's rheological properties. We concluded that the smaller viscosity values obtained for the plasma produced fumed silica were due to the lack of the free hydroxyl groups from the surface of the particles.

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Bajja, Zineb. "Influence de la microstructure sur le transport diffusif des pâtes, mortiers et bétons à base de CEM I avec ajout de fumée de silice." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN054/document.

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Au regard de son importante résistance mécanique mais surtout de ses capacités de confinement potentielles conférées par une microstructure compacte, le béton s’avère le matériau le plus adapté pour composer la barrière ouvragée de la structure de stockage et l’enrobage de certains déchets radioactifs. La connaissance des propriétés de diffusion et de microstructure de ces matériaux cimentaires sont donc des éléments indispensables à l’étude de leurs durabilités à long terme. Dans un contexte plus particulier de confinement des déchets de faible à moyenne activité, l'utilisation des formulations avec ajout de fumée de silice (FS) s'avère d'une grande importance. La démarche expérimentale consiste d’abord à sélectionner des formulations de pâtes et de mortiers à tester en diffusion HTO. Leurs compositions initiales (rapport e/liant, teneur en FS, teneur en sable et granulométrie du sable) ont été variées de telle façon à balayer des microstructures et des propriétés diffusives différentes, et à voir l’influence de chaque paramètre (eau, FS, teneur et granulométrie du sable) sur l’évolution de la diffusivité au sein de ces matériaux. La microstructure a été investiguée afin d’interpréter les valeurs des coefficients de diffusion obtenus. Différentes techniques complémentaires ont été utilisées pour caractériser cette structure poreuse (porosimétrie à l’eau, au mercure, l’adsorption d’azote,), pour vérifier la réactivité de la FS (ATG, MEB associé à l’EDS), et pour déterminer le profil de porosité au niveau de l’ITZ (MEB associé à l’analyse d’images).Le lien entre les propriétés de la microstructure et le coefficient de diffusion a ensuite été discuté. L’objectif ultime étant de trouver un lien entre les propriétés de la microstructure et les paramètres de transport nous permettant, in fine, à partir d’une simple caractérisation, d’estimer le DeHTO du béton, très difficile à obtenir par l’essai en cellules de diffusion HTO. D’autres tentatives ont également été faites pour essayer d’évaluer ce coefficient de béton, comme la démarche de modélisation multi-échelle (de l’échelle des hydrates au modèle 3D), ou la diffusion d’autres éléments (en l’occurrence ici de gaz O2 et N2).La présente étude montre que des agglomérats de fumée de silice (slurry) observés dans la pâte de ciment et dans le mortier à faible teneur volumique en sable normalisé (ici 10%), impactent les rôles filler et pouzzolanique de la FS et par conséquent les paramètres de durabilité de ces matériaux. Cependant, la présence d’une forte teneur en granulats (>30%) pendant le malaxage du mortier améliore considérablement la dispersion des particules de FS et aide à cisailler et à briser ces agglomérats en fournissant une meilleure homogénéité du mélange et en améliorant les propriétés microstructuraux et diffusionnels. Il a également été montré que l’utilisation de la FS sous forme slurry dans un mélange cimentaire est malgré tout nettement meilleure que la FS densifiée, communément utilisée dans la littérature. Des relations DeHTO et rayon critique, ou DeHTO et porosité accessible au mercure ont était établies et ont permis d’approcher plus ou moins des coefficients de diffusion HTO de bétons avec et sans ajout de FS
Thanks to its high mechanical strength and its potential containment capacity conferred by a compact microstructure, concrete is considered as the most suitable material to compose the engineered barrier of some radioactive waste storage structure. Knowledge of diffusion properties and microstructure of these cementitious materials is then essential to study their long-term durability. In a more specific context of low and intermediate waste management, the use of formulations containing silica fume (SF) appears of great importance. The experimental approach consists in selecting many formulations of pastes and mortars to test by the HTO through-out diffusion test. Their initial compositions (water to binder ratio, SF content, sand content and particle size) were varied in order to browse different microstructures and diffusion properties, and to see the influence of each parameter (water, SF, content and grain size of sand) on the evolution of diffusivity within these materials. The microstructure was investigated to interpret the obtained values of diffusion coefficients. Different complementary techniques have been used to characterize the porous structure (water and mercury intrusion porosimetry, nitrogen adsorption), to verify SF reactivity (TGA, SEM associated to EDS) or to determine the profile porosity at ITZ (SEM combined with image analysis).The relationship between microstructure and diffusion coefficients (DeHTO) was then discussed. The ultimate goal was to find a link between microstructure properties and transport parameters to estimate from a simple characterization, the DeHTO of concrete, difficult to get from HTO diffusion cells test. Other attempts have also been made to try to assess the concrete diffusion coefficient, such as the multi-scale modeling approach (the scale of hydrates 3D model), or the diffusion of other elements ( like oxygen or nitrogen).This study shows that silica fume agglomerates (slurry) observed in cement paste and mortar with low standardized sand content (10%), impact the filler and pozzolanic roles of the SF and therefore sustainability parameters of these materials. On the other side, the presence of high aggregates content (> 30%) during mortar’s mixing greatly improves the dispersion of SF particles and helps shearing these agglomerates by providing better homogeneity of the mixture and enhancing microstructural and diffusional properties. It was also shown that the use of the SF as a slurry form in a cementitious mixture is still significantly better than the use of the densified FS, commonly used in the literature. Relations between the DeHTO and the critical pore radius, or the DeHTO and mercury porosity have been established and helped to estimate more or less the HTO diffusion coefficients of two concretes with or without SF

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Al-Eesa, Azmi Sami Said. "Silica fume concrete in hot and temperate environments." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/6829.

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his investigation deals with the influence of hot and temperate curing environments on the hardened properties of concrete and mortar mixes. Condensed silica fume was blended with OPC as a potential alternative cementitious material to plain OPC for use in the hot Iraqi climate, in an attempt to find a cement combination that would overcome some of the durability problems experienced when using a plain OPC concrete in such an environment. Throughout the investigation two curing environments were used: the first simulating the UK temperate climate and the second simulating the hot Iraqi climate. Temperature and humidity were varied to simulate day and night time. The first stage of the experimental study was the development of a mix design method capable of producing an OPC-CSF cement concrete of a medium workability and a specific 28-days compressive strength ranging between 25 to 55 MPa, both with and without superplasticizer. Three grades of concrete strength were chosen (25,40 and 55 MPa) and the effect of four cement replacement levels (5,10,15 and 20%) of silica fume on concrete compressive strength was assessed. Test results showed that CSF was relatively more effective in lean mixes than in rich ones. Compressive strength of CSF concrete increased with increasing CSF percentages for both normal and superplasticized mixes up to an optimum levels of 10-15% and 15-20%, respectively. The amount of OPC (kg/m`3) necessary to bring a change in compressive strength of 1MPa was also determined and the theoritical blend proportions of OPC-CSF necessary to produce 28-day compressive strength equivalent to the plain OPC mixes were determined from the produced data above. The theoretical blend proportions were examined experimentally and the data were used to establish the relationship between strength and water/cementitious ratio for the blend mixes with and, without superplasticizer. Results showed that this basic relationship had changed quantitatively but not qualitatively when CSF was used. A cost study using current OPC and CSF material costs -was performed in an attempt to determine'the- most economic blend proportions. A total of eleven different concrete -mixes were selected to study the effect of curing environment (hot and temperate), initial curing time (0,1,3 and`-7 days) and curing method (water and polythene sheeting) on the compressive strength, permeability and absorption properties of the CSF concretes. Tests were carried out at 3,7, '14, 28,56,90 and 180 days of age. In addition five different mortar, mixes were used to examine the effect of curing environment (temperate and hot) an the *permeability, pore size distribution and durability to magnesium sulphate attack. Test results showed that hot Iraqi curing environment was favourable to the early-age strength, absorption and permeability of plain OPC mixes. However, - the later-age properties were significantly lower than those obtained for concretes cured in a temperate UK environment. For plain OPC mixes a critical curing period of 3 days was found under both temperate and hot environment. For the CSF blend mixes critical curing periods for the temperate and hot environment were found to be 3 and 1 day respectively. Results also reveal the importance of curing specimens immediately after casting for one day. Research work has also confirmed the superiority of water curing over polythene sheeting in a temperate environment for the rich plain OPC and CSF mixes. However, there was no significant difference between water and polythene for lean mixes. The reduction in , permeability and absorption properties of CSF mixes cured in a both temperate and hot environments is thought to be due to the changes in the pore structure brought about by the use of silica fume. Combining CSF with OPC was found to increase the percentages and volume of fine pores at the expense-of coarse pores. This effect may be described as a "refining" effect. Finally, the performance of CSF mortar mixes cured in a temperate and hot environment and their resistance to magnesium sulphate attack was significantly better than the plain OPC ones.

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Gans, Ira. "The production of ultrafine silica particles through a transferred arc plasma process /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65464.

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Konduru, Sathish Kumar Raju. "Performance evaluations of latex-modified and silica fume modified concrete overlays for bridge decks." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10559.

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Thesis (M.S.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains xv, 235 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 212-216).

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Pun, Pierre Che Ho. "Influence of silica fume on chloride resistance of concrete." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28837.pdf.

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Kashi, Mohsen Gholam-Reza. "Freeze-thaw durability of high strength silica fume concrete." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53942.

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Specimens from 27 batches of concrete with water to cementitious (cement plus silica fume) ratio of 0.25 to 0.32, with and without entrained air, were tested for freeze-thaw durability in accordance with ASTM C666, procedure A (freezing and thawing in water). In addition, another set of similar specimens were moist cured for 28 days instead of 14 days and tested in accordance with ASTM C666 , Procedure A to determine the effect of curing time on the freeze-thaw durability of high strength concrete. Results show that non air-entrained high strength concrete with water cementitious ratio of less than 0.30, regardless of the length of curing time, is frost resistant. Non-air-entrained concrete with water-cement ratio of 0.32 is also durable if silica fume is not used.
Ph. D.

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Shehata, Medhat H. "The effects of fly ash and silica fume on alkali-silica reaction in concrete." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ58597.pdf.

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Книги з теми "SILICA FUMES"

Rashad, Alaa M. Silica Fume in Geopolymers. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33219-7.

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M, Malhotra V., ed. Condensed silica fume in concrete. Boca Raton, Fla: CRC Press, 1987.

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Whiting, D. Silica fume concrete for bridge decks. Washington, D.C: National Academy Press, 1998.

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V, Lisichkin G., ed. Modifit͡s︡irovannye kremnezemy v sorbt͡s︡ii, katalize i khromatografii. Moskva: "Khimii͡a︡", 1986.

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Boddy, Andrea M. The effect of product form and silica content of silica fume on its ability to control alkali-silica reaction. Ottawa: National Library of Canada, 2000.

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Pun, Pierre Che Ho. Influence of silica fume on chloride resistance of concrete. Ottawa: National Library of Canada, 1997.

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Elias, Wiliam Shila. Effects of silica fume on corrosion resistance of reinforced concrete. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1991.

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Douglas, E. Compilation of abstracts of papers from recent international conferences and symposia on condensed silica fume in concrete. [Ottawa]: Energy, Mines, and Resources Canada, Canada Centre for Mineral and Energy Technology, 1988.

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Smith, Amanda J. Factors affecting the sulphate resistance of mortars containing slag and silica fume. Ottawa: National Library of Canada, 2002.

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Pashutinski, Igor. Mechanisms of improved sulphate resistance of concrete containing slag or silica fume. Ottawa: National Library of Canada, 1990.

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Частини книг з теми "SILICA FUMES"

Shinde, Vaibhav Vithal, and Bhagyesh B. Deshmukh. "Magneto Rheological Brake with Silicon Based Fluid and Hybrid of Silica Fumes with GO2 as Additives." In Techno-Societal 2020, 107–14. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69925-3_11.

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Yeğinobali, A., and F. T. Dilek. "A Comparative Study on Sulfate Resistance of Mortars Containing Silica Fumes and Fly Ash." In Durability of Building Materials & Components 7 vol.1, 361–71. London: Routledge, 2018. http://dx.doi.org/10.4324/9781315025025-41.

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Singh, Gurwinder, and Aditya Kumar Tiwary. "Influence of Concrete with Partial Replacement of Fine Aggregates with Crumb Rubber and Cement with Silica Fumes." In Lecture Notes in Civil Engineering, 131–43. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1886-7_11.

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Gooch, Jan W. "Fumed Silica." In Encyclopedic Dictionary of Polymers, 329. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5345.

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Lewis, Robert C. "Silica Fume." In RILEM State-of-the-Art Reports, 99–121. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70606-1_3.

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Siddique, Rafat, and Mohammad Iqbal Khan. "Silica Fume." In Supplementary Cementing Materials, 67–119. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17866-5_2.

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Ramezanianpour, Ali Akbar. "Silica Fume." In Springer Geochemistry/Mineralogy, 193–223. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36721-2_4.

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Rashad, Alaa M. "Silica Fume as a Part of Precursor/An Additive." In Silica Fume in Geopolymers, 9–83. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33219-7_2.

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Rashad, Alaa M. "General Perspective and Suggestions for Upcoming Work." In Silica Fume in Geopolymers, 103–9. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33219-7_5.

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Rashad, Alaa M. "Silica Fume as an Activator Component." In Silica Fume in Geopolymers, 85–93. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33219-7_3.

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Тези доповідей конференцій з теми "SILICA FUMES"

Al-Rifaie, Wail, Abdalmjeed Alawaneh, Mohammed Al-Bajawi, and Waleed Ahmed. "Effect of Nano Silica on Compressive Strength of Concrete." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87799.

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In the present work, the use of nano silica fume in developing a compressive strength of concrete that can lead to improvement in concrete construction is carried out in the present work. One of the parameters considered is a number of curing days for measuring the compressive strength. The measured results demonstrate the increase in compressive. To achieve our goals, concrete cubes were cast and tested for compressive strength, all concrete sample has the same mixing ratio and sub-classified to standard, and Silica fume added by weight of cement (5%, 10%, 15%, 20% and 30%). The results show that the recommended addition was 15% of Silica fumes for optimum compressive strength that reaches 74.8 MPa.

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"Effectiveness of Various Silica Fumes in Preventing Alkali-Silica Expansion." In SP-100: Concrete Durability: Proceedings of Katharine and Bryant Mather International Symposium. American Concrete Institute, 1987. http://dx.doi.org/10.14359/2107.

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"Surface and Colloidal Properties of Silica Fumes in Aqueous Medium." In "SP-153: Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete Proceedings Fifth International Conference Milwauk". American Concrete Institute, 1995. http://dx.doi.org/10.14359/1094.

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"Sulfate Resistance of Mortars Containing Silica Fumes as Evaluated by Different Methods." In "SP-153: Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete Proceedings Fifth International Conference Milwauk". American Concrete Institute, 1995. http://dx.doi.org/10.14359/1098.

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Abas, Noor Faisal. "Analysis Of Strength Characteristics Of Concrete With Silica Fumes And Calcium Nitrate." In ICRP 2019 - 4th International Conference on Rebuilding Place. Cognitive-Crcs, 2019. http://dx.doi.org/10.15405/epms.2019.12.62.

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Olsson, A., and H. Kromhout. "OCCUPATIONAL CANCER BURDEN: THE CONTRIBUTION OF EXPOSURE TO PROCESS-GENERATED SUBSTANCES AT THE WORKPLACE." In The 16th «OCCUPATION and HEALTH» Russian National Congress with International Participation (OHRNC-2021). FSBSI “IRIOH”, 2021. http://dx.doi.org/10.31089/978-5-6042929-2-1-2021-1-617-620.

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Abstract. Occupational exposure to respirable crystalline silica, diesel engine exhaust emissions and welding fumes are widespread risk factors for lung cancer, and account for approximately half of the occupational lung cancer burden. If employers succeed in controlling workplace exposures to these process-generated substances, the fraction of lung cancers attributable to occupational exposures could be reduced dramatically.

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S. K., Vidhya. "Strength Characteristics of Concrete by Partially Replacing Cement with Silica Fumes and Tile Dust." In The International Conference on scientific innovations in Science, Technology, and Management. International Journal of Advanced Trends in Engineering and Management, 2023. http://dx.doi.org/10.59544/qswf3816/ngcesi23p12.

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The concrete is a cement-based material which has become most popular and widely used in construction field such as highways, flyovers, buildings, dams etc. Now a days the consumption of concrete increased exponentially and structure without concrete cannot be imagined. Durability of concrete mainly depends upon the climatic condition which may likely to damage the concrete structures. To enhance the life against such problems it is necessary to improve the mechanical properties of the concrete. The use of pozzolanic in concrete and mortar was started with a view to reduce the cost, overcome the adverse effects of OPC and utilize waste products and by products of industrial activities which were providing harmful to environment, natural resources etc. Also, the use of pozzolanas improves several properties of mortar and concrete viz. workability, strength, resistance to cracks permeability and durability. Further the use of pozzolanas has resulted in the production of high- performance concrete. Owing to globalization, privatization and liberalization, the construction of important infrastructure projects are increasing in developing countries like India. Such development activities require large quantities of natural resources. This leads to faster depletion of natural resources on one side and manifold increase in cost of construction of structures on the other side, which is a major problem in construction sector today. In view of this people have started searching for suitable alternate materials which can be used either as an additive or as a partial replacement to conventional ingredients of concrete. Use of tile dust as partial replacement for cement in concrete is one such economical method. In the laboratory tests were conducted by partially replacing cement in concrete by tile dust as 0%, 10%, 20%, 30%, 40% & 50%. The development of compressive strength, split tensile strength and flexural strength of concrete at the age of 7, 28, 56 days are investigated. These strengths are compared with conventional concrete of the same mix proportions.

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"Influence of Storage Conditions and Concrete Composition on the Effectiveness of Different Silica Fumes Against ASR." In "SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete". American Concrete Institute, 1998. http://dx.doi.org/10.14359/6027.

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Sathiaseelan, Brindha, Hannah Angelin Moses, and Sathiaseelan Paramasivam. "Experimental investigation of self compacting and self curing cement paving blocks incorporated with hypo sludge and silica fumes." In 5TH INTERNATIONAL CONFERENCE ON INNOVATIVE DESIGN, ANALYSIS & DEVELOPMENT PRACTICES IN AEROSPACE & AUTOMOTIVE ENGINEERING: I-DAD’22. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0139839.

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Gibson, LuAnn. "Mitigating Environmental and Occupational Health Concerns for the Electronic Demanufacturing Industry." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1186.

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Abstract There are numerous aspects of the electronics demanufacturing industry that may be scrutinized by Occupational Safety and Health regulators. In older computer equipment, there may be materials that have since been banned from use in industry, such as PCBs. Workers disassembling electronic equipment need to be able to recognize components containing this hazardous material. Disassemblers are also exposed to lifting and cutting hazards in their activities. Those who shred or grind their electronics may be exposed to particulated heavy metals or silica, as well as dangerous levels of noise. When electronic components are removed from circuit boards, melting the solder will release lead fumes that must be properly ventilated. Recent and pending changes in OSHA requirements will affect electronics demanufacturers. Forklift standards were revised March 1, 1999, silica exposure limits may soon be reduced, and an ergonomics standard is pending. Universal and waste must be properly handled and stored in ways that comply with regulations and protect the safety and health of the workers. As a new but growing industry, electronics demanufacturers and recylers must remain aware of potential errors that could cost tens of thousands of dollars in OSHA fines or workers’ compensation claims.

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Звіти організацій з теми "SILICA FUMES"

Burroughs, Jedadiah, Jason Weiss, and John Haddock. Influence of high volumes of silica fume on the rheological behavior of oil well cement pastes. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41288.

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Specialized classes of concrete, such as ultra-high-performance concrete, use volumes of silica fume in concrete that are higher than those in conventional concrete, resulting in increased water demand and mixing difficulty. This study considered the effects of eight different silica fumes in three dosages (10%, 20%, 30%) with three w/b (0.20, 0.30, 0.45) on rheological behavior as characterized by the Herschel-Bulkley model. Results indicated that the specific source of silica fume used, in addition to dosage and w/b, had a significant effect on the rheological behavior. As such, all silica fumes cannot be treated as equivalent or be directly substituted one for another without modification of the mixture proportion. The rheology of cement pastes is significantly affected by the physical properties of silica fume more so than any chemical effects.

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Khan, Saad A., Peter S. Fedkiw, and Gregory L. Baker. Composite polymer electrolytes using functionalized fumed silica: synthesis, rheology and electrochemistry. Office of Scientific and Technical Information (OSTI), May 2002. http://dx.doi.org/10.2172/804908.

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Trautschold, Olivia Carol. Dynamic Moisture Sorption and Desorption in Fumed Silica-filled Silicone Foam. Office of Scientific and Technical Information (OSTI), September 2016. http://dx.doi.org/10.2172/1321702.

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Khan, Saad A., Peter S. Fedkiw, and Gregory L. Baker. Composite polymer electrolytes using fumed silica fillers: synthesis, rheology and electrochemistry. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/761809.

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Zarr, Robert R., Thomas A. Somers, and Donn F. Ebberts. Room-temperature thermal conductivity of fumed-silica insulation for a Standard Reference Material. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nist.ir.88-3847.

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Smith, David R., and Jerome G. Hust. Microporous fumed-silica insulation board as a candidate Standard Reference Material of thermal resistance. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nist.ir.88-3901.

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Stutzman, Paul E., and James R. Clifton. Microstructural features of some low watersolids, silica fume mortars cured at different temperatures. Gaithersburg, MD: National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4790.

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Smith, David R. Microporous fumed-silica insulation as a Standard Reference Material of thermal resistance at high temperature. Gaithersburg, MD: National Institute of Standards and Technology, 1989. http://dx.doi.org/10.6028/nist.ir.89-3919.

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Douglas, E., and V. M. Malhotra. Compilation of-abstracts of papers from recent international conferences and symposia on condensed silica fume in concrete. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/305078.

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Hartell, Julie, Matthew O’Reilly, and Hang Zeng. Measuring Transport Properties of Portland Cement Concrete Using Electrical Resistivity. Illinois Center for Transportation, August 2023. http://dx.doi.org/10.36501/0197-9191/23-012.

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Although classification tables based on susceptibility to chloride ion permeability are recommended in AASHTO T 358, the classification levels with respect to durability parameters may or may not be adequate. Of interest for concrete pavement performance, this study verifies the recommended classification levels against standard durability testing such as corrosion, salt scaling, and freeze-thaw. The researchers conducted corrosion, salt scaling, and freeze-thaw durability tests in parallel with electrical surface resistivity testing to compare performance classifications for each method. Twenty-four mixture designs were evaluated. The designs vary in water-to-cementitious material ratio (0.4, 0.45, and 0.5 w/cm ratio), supplementary cementitious material type (100% ordinary Portland cement, 20% Class C fly ash, 40% Grade 100 slag cement, and 8% silica fume replacements), and air content (air entrained and non-air entrained). The results of the experimental study indicate that there is no clear relationship between concrete electrical conductivity and durability performance based on standard methods of testing. It may not be appropriate for the determination of durability performance of a concrete mixture for concrete pavement construction. However, the test method does present advantages, as mixtures of similar composition and design can yield the same results over time under standardized curing. Here, resistivity-time curves could be a useful tool as part of a quality control and quality assurance program to ensure consistency in concrete delivery during construction.

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