Journal articles on the topic 'Nano concrete'
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Zhang, Mao Hua. "Pore Characteristics of Pavement Concrete with Nano-Particles." Applied Mechanics and Materials 275-277 (January 2013): 2073–76. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.2073.
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Pore characteristics of pavement concrete with nano-particles (TiO2 or SiO2) are experimentally studied and compared with that of plain pavement concrete. The test results indicate that the addition of nano-particles improves the pore structure of concrete. The refined extent of pore structure of concretes increase with decreasing content of nano-particles. The pore structure of concrete with nano-TiO2 is better than that of concrete with the same content of nano-SiO2.
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Sánchez, E., J. Bernal, A. Moragues, and N. León. "Propiedades reológicas y mecánicas de un hormigón autocompactante con adición de nano-sílice y micro-sílice." Revista ALCONPAT 6, no. 1 (March 16, 2016): 1–14. http://dx.doi.org/10.21041/ra.v6i1.111.
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Propiedades reológicas y mecánicas de un hormigón autocompactante con adición de nano-sílice y micro-síliceRESUMENEl hormigón autocompactante es el resultado de diseñar mezclas de calidad con capacidad para asegurar su correcta colocación en estructuras fuertemente armadas en las cuales el proceso del vibrado resulta muy complicado y con riesgo de alterar la posición de las armaduras. Unido a las ventajas de este hormigón y debido a la mayor demanda de hormigones de altas prestaciones, se utiliza humo de sílice y, más recientemente, nanomateriales como adiciones. Principalmente nano-sílice. El objetivo de este trabajo es obtener hormigones autocompactantes con nano-sílice, humo de sílice y mezclas binarias de ambas adiciones que satisfagan la demanda de altas resistencias mecánicas y durables, determinando que la dosificación con mejores prestaciones es la que contiene 2.5% de nano y 2.5%.de humo de sílice. Palabras clave: Autocompactante; nanosílice; humo de sílice; reología; propiedades mecánicas. Rheological and mechanical properties of self-compacting concrete with the addition of nano-silica and microsilicaABSTRACTSelf-compacting concrete is the result of designing a quality concrete with the capacity to ensure placement of reinforcement in heavily reinforced structures in which the process of vibrating is very complicated and risky by altering the position of the reinforcement. Together with the advantages of this concrete and due to the increased demand for high-performance concretes, the silica fume, and more recently, the nano-materials are used as additions, but mainly the nano-silica. The objective of this work is to obtain self compacting concrete with nano-silica, silica fume and binary mixtures of the two additions to meet the demand for high mechanical and durable resistance. The mix with better performance is that with 2.5% of nano-sílica and 2.5% silica fume. Keywords: self-compacting concrete; nanosilica; silica fume; rheology; mechanical properties. Propriedades reológicas e mecânicas de um concreto auto adensável, com a adição de nano sílica e de micro sílica (sílica ativa)RESUMOO Concreto Auto-adensável é o resultado da concepção de um concreto de qualidade com a capacidade para assegurar a colocação de reforço em estruturas fortemente armados em que o processo de vibração é muito complicado e arriscado por alterar a posição da armadura . Juntamente com as vantagens deste concreto e devido ao aumento da procura de concretos de alto desempenho , o fumo de sílica e mais recentemente , os nano-materiais são usados como adições . Principalmente a nano- sílica. O objetivo deste trabalho é a obtenção de concreto auto- adensável com nano- sílica , sílica ativa e misturas binárias das duas adições para atender a demanda de alta resistência mecânica e durável. A mistura com melhores desempenhos é aquela que contém 2,5 % de nano - sílica e 2,5% de pó de sílica . Palavras-chave: Auto-compactável; nano-sílica; sílica activa; reologia; propriedades mecánicas.
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Lv, Zhengyi, Maohua Zhang, and Yanyu Sun. "Research on The Chloride Diffusion Modified Model for Marine Concretes with Nanoparticles under The Action of Multiple Environmental Factors." Journal of Marine Science and Engineering 10, no. 12 (December 1, 2022): 1852. http://dx.doi.org/10.3390/jmse10121852.
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Marine concrete structures are subject to the action of multiple environments during their service time. This leads to increased deterioration in the durability of marine concretes under the combined action of bending load and dry–wet cycles, salt freeze–thaw cycles, and salt spray erosion. The main reason for the damage of concrete under the action of the above three environments is Cl- attack. The free Cl- content (Cl-f) and the free Cl- diffusion coefficient (Df) of concrete can explain the diffusion of Cl- in concrete. This paper considers the actual environment of marine concrete structures and develops the Cl- diffusion modified model for nano-marine concretes under the action of dry–wet cycles, salt freeze–thaw cycles, and bending load and salt spray erosion. The nano-SiO2, nano-Fe2O3, and nano-Fe3O4 were firstly incorporated into ordinary marine concrete, then the Cl- content of each group of marine concrete was measured at different depths, and the Cl- diffusion coefficients were calculated; finally, the Cl- diffusion modified model was established under different environmental factors. The test results show that the total and free Cl- diffusion coefficients of nano-marine concretes were lower than those of ordinary marine concrete, and the nano-SiO2, nano-Fe2O3, and nano-Fe3O4 of the optimum dosage were 2%, 1%, and 2%, respectively. The fitting results of Cl- content have a good correlation, and the correlation coefficient (R) is basically above 0.98.
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Jou, Samira Keramat, Asghar Mesbahi, Reza Eghdam Zamiri, and Farshad Seyednejad. "Monte Carlo Calculation of linear attenuation coefficients and photon scattering properties of novel concretes loaded with Osmium, Iridium and Barite nanoparticles." Polish Journal of Medical Physics and Engineering 27, no. 4 (December 1, 2021): 291–98. http://dx.doi.org/10.2478/pjmpe-2021-0034.
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Abstract Introduction: Recent studies have shown that the use of high-density nanoparticles (NPs) in concrete composition improves its radiation shielding properties. In the present study, the linear attenuation coefficients and photon scattering properties of newly developed high-density Nano-concretes have been calculated using the MCNPX Monte Carlo code. Material and methods: The shielding properties of Nano-concretes containing 10%, 20%, and 30% weight percentage of Osmium, Iridium and Barite NPs (100 nm) as well as ordinary concrete were investigated. The 6 and 18 MV photon beams of Varian Linac and 60 Co photons were used for simulation. Photon scattering flux was calculated for all Nano-concretes with 30 wt% of NPs and ordinary concrete at different angles. Results: In general, by adding Iridium, Osmium and Barite NPs to ordinary concrete, the linear attenuation coefficients increased. Despite a lower density relative to Iridium and Osmium, Nano-concretes containing Barite exhibited a higher linear attenuation coefficient due to their higher electron density. Conclusions: The results revealed a dependence between the scattered photon flux and the effective atomic number of Nano-concretes. With increasing the atomic number of fillers, the intensity of the scattered photon flux enlarged. Also, the scattered flux was higher for all types of concretes at 180 degrees relative to other angles.
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Zhang, Peng, Qingfu Li, Yuanzhao Chen, Yan Shi, and Yi-Feng Ling. "Durability of Steel Fiber-Reinforced Concrete Containing SiO2 Nano-Particles." Materials 12, no. 13 (July 7, 2019): 2184. http://dx.doi.org/10.3390/ma12132184.
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An experimental study was conducted to investigate the effect ofnano-SiO2 and steel fiber content on the durability of concrete. Five different dosages of nano-SiO2 particles and five volume dosages of steel fiber were used. The durability of concretes includes permeability resistance, cracking resistance, carbonation resistance, and freezing-thawing resistance, and these were evaluated by the water permeation depth, number of cracks, total cracking area per unit area of the specimens, carbonation depth of the specimens, and the relative dynamic elastic modulus of the specimens after freezing-thawing cycles, respectively. The results indicate that the addition of nano-SiO2 particles significantly improves the durability of concrete when the content of nano-SiO2 is limited within a certain range. With the increase of nano-SiO2 content, the durability of concrete first increases and then decreases. An excessive number of nano-SiO2 particles could have an adverse effect on the durability of the concrete. The addition of the correct amount of steel fibers improves the carbonation resistance of concrete containing nano-particles, but excessive steel fiber reduces the carbonation resistance. Moreover, the addition of steel fibers reduces the permeability resistance of concrete containing nano-particles. The incorporation of steel fiber enhanced the freezing-thawing resistance and cracking resistance of concrete containing nano-particles. With increasing steel fiber content, the freezing-thawing resistance of the concrete containing nano-particles increases, and the cracking resistance of the concrete decreases gradually.
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Grzegorczyk-Frańczak, Małgorzata, Danuta Barnat-Hunek, Kalina Materak, and Grzegorz Łagód. "Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties." Materials 15, no. 22 (November 10, 2022): 7938. http://dx.doi.org/10.3390/ma15227938.
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In this study, the possibility of using mixing water containing O2 and O3 micro-nano bubbles (M-NBs) in concrete technology was investigated. In particular, the effect of micro-nano bubbles on the durability and frost resistance of concrete was analyzed. Concretes with two types of micro-nano bubbles were studied. The physical properties of both the modified concretes and the reference concrete were determined, i.e., specific and apparent density, porosity, weight absorption and coefficient of water absorption. Mechanical parameters based on compressive and flexural strength were tested after 14 and 28 days of curing. Concrete durability was determined on the basis of frost resistance and resistance to salt crystallization. The pore distribution in the cement matrix was determined based on porosimetry studies. The use of water with micro-nano bubbles of O2 and O3, among others, contributed to a reduction in the water absorption coefficient from 42.7% to 52.3%, in comparison to the reference concrete. The strength characterizing the concrete with O3 increased by 61% after 28 days, and the frost resistance after 150 F-T cycles increased by 2.4 times. Resistance to salt crystallization improved by 11% when water with O3 was used.
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Abdel-Ghaffar, F., U. F. Kandil, and A. A. Abdel-Khalek. "Nano-modified polymer concrete for infrastructure applications." International Journal of Academic Research 6, no. 1 (January 30, 2014): 75–84. http://dx.doi.org/10.7813/2075-4124.2014/6-1/a.10.
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Stel’makh, Sergey A., Evgenii M. Shcherban’, Alexey Beskopylny, Levon R. Mailyan, Besarion Meskhi, Nikita Beskopylny, and Yuriy Zherebtsov. "Development of High-Tech Self-Compacting Concrete Mixtures Based on Nano-Modifiers of Various Types." Materials 15, no. 8 (April 8, 2022): 2739. http://dx.doi.org/10.3390/ma15082739.
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Promising areas of concrete material science are maximum greening, reducing the carbon footprint, and, at the same time, solving the problems of increasing the cost of raw materials using industrial waste as modifiers for self-compacting concrete mixtures. This study aimed to review, investigate and test from the point of view of theory and practice the possibility of using various industrial types as a nano-modifier in self-compacting concrete with improved performance. The possibility of nano-modification of self-compacting concrete with a complex modifier based on industrial waste has been proved and substantiated theoretically and experimentally. The possibility of improving the technological properties of concrete mixtures using such nanomodifiers was confirmed. The recipe and technological parameters of the process were revealed and their influence on the characteristics of concrete mixes and concretes were expressed and determined. Experimental technological and mathematical dependencies between the characteristics of the technological process and raw materials and the characteristics of concrete mixtures and concretes were determined. The optimization of these parameters was carried out, a theoretical substantiation of the obtained results was proposed, and a quantitative picture was presented, expressed in the increment of the properties of self-compacting concrete mixtures using nano-modifiers from industrial waste concretes based on them. The mobility of the concrete mixture increased by 12%, and the fluidity of the mixture increased by 83%. In relation to the control composition, the concrete strength increased by 19%, and the water resistance of concrete increased by 22%. The ultimate strains decreased by 14%, and elastic modulus increased by 11%.
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Bahadori, Hadi, and Payam Hosseini. "REDUCTION OF CEMENT CONSUMPTION BY THE AID OF SILICA NANO-PARTICLES (INVESTIGATION ON CONCRETE PROPERTIES)." Journal of Civil Engineering and Management 18, no. 3 (June 29, 2012): 416–25. http://dx.doi.org/10.3846/13923730.2012.698912.
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In this study, effects of replacing cement with colloidal amorphous silica nano-particles have been experimentally investigated on the physical and mechanical properties, durability and microstructure of concrete. Experimental results include workability, fresh concrete density, and hardened concrete properties like compressive strength at different ages of 3, 7, and 28-days, and also 28-days splitting tensile strength. Furthermore, influence of silica nano-particles on durability and microstructure of concrete for 28-days specimens was tested by conducting water absorption test, Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Analysis (EDAX), respectively. In order to study the effect of replacement of cement with silica nano-particles, specimens with 10%, 20%, and 30% cement reduction, and addition of 1%, 2%, and 3% silica nano-particles with respect to witness specimen were fabricated. Experimental results revealed that 20% reduction of cement combining 2% silica nano-particles and also 10% cement reduction combined with 1% silica nano-particles enhance the microstructure of concrete, despite unnoticeable compressive and tensile strength loss. By remarkable reduction of cement consumption and addition of silica nano-particles, strength almost remains constant and consequently decreasing the cement content will become possible. Also, in all specimens, increase in nano-particles content and decrease in cement usage contributed to workability loss. Therefore, applying super-plasticizers seems indispensible while using silica nano-particles. On the other side, according to water absorption test, concretes containing nanoparticles showed more appropriate durability.
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Poudyal, Lochana, Kushal Adhikari, and Moon Won. "Nano Calcium Carbonate (CaCO3) as a Reliable, Durable, and Environment-Friendly Alternative to Diminishing Fly Ash." Materials 14, no. 13 (July 2, 2021): 3729. http://dx.doi.org/10.3390/ma14133729.
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Fly ash is widely used in the cement industry to improve the performance and durability of concrete. The future availability of fly ash, however, is a concern, as most countries are inclining towards renewable energy sources as opposed to fossil fuels. Additional concerns have been raised regarding the impact of strict environmental regulations on fly ash quality and variability. This paper, therefore, evaluates if nano calcium carbonate (nano CaCO3) can be used as an alternative to fly ash. This paper presents comprehensive testing results (fresh, hardened, and durability) for OPC (Ordinary Portland Cement) and PLC (Portland Limestone Cement) concretes with 1% nano CaCO3 and compares them to those for concretes with fly ash (both Class F and C). Compared to concretes with fly ash, OPC and PLC with nano CaCO3 presented improved testing results in most cases, including later age strength, permeability, and scaling resistance. As nanotechnology in concrete is a relatively new topic, more research on the efficient use of nanotechnology, such as for proper dispersion of nano CaCO3 in the concrete, has potential to offer increased benefits. Further, nano CaCO3 is environmentally and economically viable, as it has the potential to be produced within the cement plant while utilizing waste CO2 and generating economic revenue to the industry. Thus, nano CaCO3 has the potential to serve as an alternative to fly ash in all beneficial aspects—economic, environmental, and technical.
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Hemanth Kumar, G., and B. Ajitha. "Prediction of Compressive Strength of Nano Alumina, Micro Alumina & Fly Ash Blended with Cement by Using Coefficient of Correlation." Asian Review of Civil Engineering 9, no. 2 (November 5, 2020): 8–11. http://dx.doi.org/10.51983/tarce-2020.9.2.2557.
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In this research study, the effect on High Strength Concrete (HSC) by partial replacement of cement with Nano alumina, micro alumina and fly ash on the mechanical properties of the concrete is studied. In this investigation the cement is replaced by 20% Fly ash, 5% micro alumina and nano alumina of different proportion i.e., 0.25%, 0.5%, 0.75%, 1% in M60 grade of concrete. It is observed that the concrete's workability is reduced by increasing the content of nano alumina from 0% to 1% and constant micro alumina particles of 5% cement (by Wt.) and fly ash of 20% cement (by wt.). The results showed that 0.75% of the combination of nano alumina, micro alumina and fly ash increases the properties of the high strength concrete. The microstructure characteristics results revealed that the Nano alumina, micro alumina and fly ash particles incorporated enhances the cement's mechanical strength properties and the voids were filled up with these materials. The present investigation is mainly focused on reliability assessment to the High Strength Concrete by using by using Karl Pearson’s correlation coefficient.
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Abdulhussein, Faisal K., Zahraa F. Jawad, Qais J. Frayah, and ِAwham J. Salman. "Investigation of the Effect of Addition Nano-papyrus Cane on the Mechanical Properties of Concrete." Civil Engineering Journal 7, no. 2 (February 1, 2021): 226–35. http://dx.doi.org/10.28991/cej-2021-03091649.
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This paper investigates the effect of nano-papyrus cane ash as an additive on concretes’ mechanical and physical properties. Three types of concrete mixtures, 1:2:4, 1:1.5:3, and 1:1:2 were prepared for each mixture, nano-papyrus ash was added in five different dosages of 0.75, 1.5, 3, 4.5, and 6% by weight of cement; therefore, eighteen mixes would be studied in this work. Physical properties represented by dry density and slump were also measured for each mix. Moreover, to evaluate the mechanical properties development split tensile strength and compressive strength were obtained at age (7 and 28). Results manifested that the adding of nano ash developed the compressive strength and split tensile strength of concrete and the maximum enhancement recognized in the mixes with a content of 4.5% nano-papyrus in each studied mixture in this work. The slump test results indicated that the workability of concrete increased with adding nano-papyrus ash gradually with increasing nanoparticles' content. As well as, dry density was significant increased with nano-papyrus ratio; greater values were recorded in mixtures with 1.5-4.5% content of nano-papyrus. When comparing the concrete mixes used, it was found that the best results were obtained with 1:1:2 mixtures. This remarkable improvement in concrete properties considers the nano-papyrus is considered a cement economical and useful replacement for traditional construction material. Doi: 10.28991/cej-2021-03091649 Full Text: PDF
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Abdul Jalil, Wijdan Deyaa, and Husaein Ali Hasan Kahachi. "The Impact of Nano-Concrete in Contemporary Architecture." Wasit Journal of Engineering Sciences 6, no. 2 (August 30, 2018): 38–45. http://dx.doi.org/10.31185/ejuow.vol6.iss2.90.
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The rapid development in technology of building materials and systems could be easily observed these days in the huge building advances such as achieving building sizes, shapes, forms and speed of building which could never be achieved by using ordinary building materials. One of the interested break overs in building materials technologies is Nano-Concrete. Nano-Concrete is the substance of adding nanomaterial to concrete. Nano-concrete has special specifications and properties when compared with the ordinary concrete mixes such as adding Nano SiO2, Nano TiO2 and Carbon Nano tubes to improve performance and structural resistance. This extended the limits of building technologies thus enabling architects to achiev more complex forms with higher performance, or giving the concrete special properties such as light pass-through concrete or self-compacting concrete.
The research deals with impact Nano-concrete on contemporary architecture by following a set of objectives:
What is Nano-concrete in brief?
How does Nano-concrete mixes differ from the ordinary mixes of concrete?
The application of Nano-concrete in buildings and its effects on contemporary architecture.
The research extracted a set of main findings and recommendations from the analyzing of the effects of Nano-Concrete on Architecture.
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Yan, Yi Zhi, Zhi Min Su, and Liang Wu. "Research on Mechanical Properties of Nano-Concrete." Advanced Materials Research 628 (December 2012): 50–54. http://dx.doi.org/10.4028/www.scientific.net/amr.628.50.
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This paper describes some of the characteristics of nano-materials are discussed nano SiO2, silica fume and nano-scale carbon-fiber reinforced concrete to improve strength and durability of the role of nano-SiO2, silica and carbon nano-fibers can be prepared as an admixture of high performance concrete, nano materials can also be used as a preparation mixed with Division of concrete with special features, such as metal oxides can be prepared by adding nano smart concrete and green concrete, metal powder can be prepared by adding nano electromagnetic shielding concrete.
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Ulm, Franz-Josef. "Nano-Engineering of Concrete." Arabian Journal for Science and Engineering 37, no. 2 (January 31, 2012): 481–88. http://dx.doi.org/10.1007/s13369-012-0181-x.
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Syamsunur, Deprizon, Li Wei, Zubair Ahmed Memon, Salihah Surol, and Nur Izzi Md Yusoff. "Concrete Performance Attenuation of Mix Nano-SiO2and Nano-CaCO3under High Temperature: A Comprehensive Review." Materials 15, no. 20 (October 11, 2022): 7073. http://dx.doi.org/10.3390/ma15207073.
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Fire and extreme heat environmental changes can have an impact on concrete performance, and as climate change increases, new concrete structures are being developed. Nano-silica and nano-calcium carbonate have shown excellent performances in modifying concrete due to their large specific surface areas. This review describes the changes in concrete modified with nano-silica (NS) and nano-calcium carbonate (NC), which accelerate the hydration reaction with the cementitious materials to produce more C-S-H, resulting in a denser microstructure and improved mechanical properties and durability of the concrete. The mechanical property decay and visualization of deformation of mixed NS and NC concrete were tested by exposure to high temperatures to investigate the practical application of mixed composite nanomaterials (NC+NS) to concrete. The nano-modified concrete had better overall properties and was heated at 200 °C, 400 °C, 600 °C and 800 °C to relatively improve the mechanical properties of the nano concrete structures. The review concluded that high temperatures of 800 °C to 1000 °C severely damaged the structure of the concrete, reducing the mechanical properties by around 60%, and the dense nano concrete structures were more susceptible to cracking and damage. The high temperature resistance of NS and NC-modified nano concrete was relatively higher than that of normal concrete, with NC concrete being more resistant to damage at high temperatures than the NS samples.
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Alireza Naji Givi, Suraya Abdul Rashid, Farah Nora A. Aziz, and Mohamad Amran Mohd Salleh. "Particle size effect on the permeability properties of nano-SiO2 blended Portland cement concrete." Journal of Composite Materials 45, no. 11 (November 8, 2010): 1173–80. http://dx.doi.org/10.1177/0021998310378908.
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In this study, nano-SiO2 has been used as a high reactive pozzolan to develop the microstructure of the interfacial transition zone between the cement paste and the aggregate. Mechanical tests of blended cement-based concretes exposed that in addition of the pozzolanic reactivity of nano-SiO2 (chemical aspect), its particle grading (physical aspect) also revealed considerable influences on the blending effectiveness. It was concluded that the relative permeability reduction (relative to the control concrete made with plain cement) is higher for coarser nano-SiO2 after 90 days of moisture curing. However, finer nano-SiO2 particles showed better effects in early ages. These phenomena can be due to the free spacing between mixture particles that was associated with the global permeability of the blended cement-based concretes. This article presents the results of the effects of particle size ranges involved in nano-SiO2 blended Portland cement on the water permeability of concrete. It is revealed that the favorable results for coarser nano-SiO2 reflect enhanced particle packing formation accompanied by a reduction in porosity and particularly in particle spacing after 90 days.
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Ahmad, Seleem S. E., Ahmed Elshami, and Amal Fawzy. "Behaviour of sustainable concretes modified with mineral admixtures and Nano-silica against aggressive media attacks." IOP Conference Series: Earth and Environmental Science 1026, no. 1 (May 1, 2022): 012052. http://dx.doi.org/10.1088/1755-1315/1026/1/012052.
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Abstract The goal of this study is to see how the effect of recycled concrete aggregate admixed with mineral admixtures and Nano-silica on concrete's durability after being exposed to aggressive media attacks. The coarse aggregates applied in the concrete were dolomite (control) and recycled concrete aggregate with the addition of various mineral admixtures such as ground granulated blast slag (GGBFS), granite, and Nano-silica. To lower the water/cement ratio, a superplasticizer (SP)-type (F) was used. The physical and mechanical properties of commonly used raw materials such as aggregates and other various concrete kinds were investigated. The effects of saltwater and 3% sodium chloride on concrete mechanical and microstructures properties were investigated. The slump values of dolomite concrete were found to be lower than those of recycled aggregate concrete. The concrete mix using recyclable aggregate has the highest compressive strength, according to the results. In terms of compressive strength, the addition of 1% NS (Nano-silica) and 15% slag increased both mechanical and durability properties of the recycled aggregate concrete in aggressive media.
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Zhang, Mao Hua, Hong Guang Wang, and Jian Min Zhang. "Mechanical Property of Pavement Concrete with Nano-Particles." Advanced Materials Research 168-170 (December 2010): 1896–99. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1896.
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Mechanical properties of pavement concrete with nano-particles are experimentally studied and compared with that of plain pavement concrete. The test results indicate that the flexural, compressive and splitting tensile strengths of pavement concrete with nano-particles are all improved with different extent. Firstly, the mechanical properties of pavement concrete are enhanced with the increasing content of nano-particles, and the peak values are achieved at certain content. Subsequently, the mechanical properties of pavement concrete are reduced with the increasing content of nano-particles. The optimum amount of nano-TiO2 and nano-SiO2 added into pavement concrete are respectively 1.0% and 2.0%. There is a significant linear relationship between flexural and compressive strengths of pavement concrete with nano-particles.
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Kumar, Kakara S. J., M. V. Seshagiri Rao, V. Srinivasa Reddy, and S. Shrihari. "Stress - strain behaviour of confined nano silica-based concrete." E3S Web of Conferences 309 (2021): 01048. http://dx.doi.org/10.1051/e3sconf/202130901048.
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In the present study, the stress-stain behaviour of confined concrete made with nano-silica (nano-SiO2) were taken up. The stress-strain behaviour was studied for the M30 and M50 grades nano-silica (nano-SiO2) concrete mixes confined with steel rebars. The confinement was given in the form of steel hoops in the cylinders, 3 hoops (0.8%), 4 hoops (1.1%), 5 hoops (1.3%) and 6 hoops (1.6%). The addition of nano-silica (nano-SiO2) along with confinement of concrete with steel hoops enhanced the compressive strength, indicating further confinement effect in the concrete. It is observed that the addition of nano-silica (nano-SiO2) is helpful in lower confinements only. Beyond 1.1% confinement, doesn’t show any effect on compressive strengths. From the stress-strain behaviour of all types of concrete mixes, it is concluded that the ultimate load-carrying capacity and strains at peak stresses are more in nano-silica (nano-SiO2) concrete with steel hoops for mixes up to 1.1% confinement. The addition of nano-silica (nano-SiO2) to concrete has increased the ductility in both confined and unconfined states
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Zhang, Mao Hua, and Song Nan Yu. "Impact Property of Concrete Containing Nano-Particles for Pavement." Advanced Materials Research 250-253 (May 2011): 417–20. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.417.
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Impact property of concrete containing nano-particles (TiO2 or SiO2) for pavement is experimentally studied and compared with that of plain concrete, concrete containing PP fibers and concrete containing both nano-TiO2 and PP fibers. The test results indicate that the impact property of concrete is enhanced when the amount of nano-particles is smaller. However, the impact property of concrete is reduced when the amount of nano-particles is larger. The impact property of concrete containing PP fibers is improved, and the impact property of concrete containing both nano-TiO2 and PP fibers is decreased. There is a significant linear relationship between impact property and flexural strength of pavement concrete.
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Gopinath, S., P. Ch Mouli, A. R. Murthy, N. R. Iyer, and S. Maheswaran. "Effect of Nano Silica on Mechanical Properties and Durability of Normal Strength Concrete." Archives of Civil Engineering 58, no. 4 (December 1, 2012): 433–44. http://dx.doi.org/10.2478/v.10169-012-0023-y.
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AbstractNano technology is an emerging field of interest for civil engineering application. Among the nano materials presently used in concrete, nano-silica possess more pozzolanic nature. It has the capability to react with the free lime during the cement hydration and forms additional C-S-H gel giving strength, impermeability and durability to concrete. Present paper investigates the effects of addition of nano silica in normal strength concrete. Three types of nano-silica in the form of nano suspension having different amount of silica content have been investigated. Mix design has been carried out by using particle packing method. X-Ray diffraction (XRD) analysis has been carried out to find the chemical composition of control concrete and nano modified concrete. Further, experimental investigations have been carried out to characterize the mechanical behaviour in compression, tension and flexure. It has been observed that the addition of nano-silica in normal strength concrete increased the compressive strength and decreased the spilt tensile strength and flexural strength. Also, Rapid chloride permeability test (RCPT) has been conducted to know the chloride permeability of control concrete, nano modified concrete, and nano coated concrete. It has been observed that the chloride permeability is less for nano coated concrete.
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Aravind, D., and P. Srinivasa Rao. "Influence of nano particles on the properties of concrete: A state of art review." YMER Digital 21, no. 07 (July 29, 2022): 1248–61. http://dx.doi.org/10.37896/ymer21.07/a4.
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Use of nanomaterials such as nano-silica, nano-alumina, nano-iron oxide, nano titanium oxide, nano carbon tubes etc., in concrete has been extensively studied in recent years. By adding nanomaterials of size 0.1 nm to 100 nm having greater surface area improves the microstructure by reducing the voids and making the matrix denser. Nanomaterials improve the mechanical and durability properties of concrete. Nano materials expected to play an important role in future in the modern concrete infrastructure. This paper will give a brief review about the influence of nanoparticles on the properties of concrete. Key words: Nano-Silica, Nano-Alumina, Nano-Iron oxide, Nano-titanium oxide, Nano carbon tubes.
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Yin, Xinfeng, Ming Zhang, Lei Wang, and Yang Liu. "Interface debonding performance of precast segmental nano-materials based concrete (PSNBC) beams." Materials Express 10, no. 8 (August 1, 2020): 1317–27. http://dx.doi.org/10.1166/mex.2020.1734.
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The precast segmental concrete (PSC) structures and the nano-materials based concrete beams are widely applied to civil engineering. On the other hand, it is well known that nano-materials have physical effects and can significantly improve the concrete properties of cement-based materials. Therefore, the interface debonding performance of precast segmental nano-materials based concrete (PSNBC) beams is investigated in this study. Two concrete specimens with nano-materials and one concrete specimen without nano-materials were prepared and bonded into PSC beams with a high strength epoxy adhesive. The smart aggregates (SAs) made of piezoceramic Lead Zirconate Titanate (PZT) and concrete are used as the intelligent transducer of monitoring test specimen. The PSC beam was loaded periodically by screw jack to simulate the random debonding damage of different degrees. The experimental results show that the interface debonding performance of the concrete specimens with nano-materials is significantly enhanced and better than that of concrete specimens without nano-materials.
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Guo, Zhan, Chenxiang Huang, and Yu Chen. "Experimental study on photocatalytic degradation efficiency of mixed crystal nano-TiO2 concrete." Nanotechnology Reviews 9, no. 1 (March 18, 2020): 219–29. http://dx.doi.org/10.1515/ntrev-2020-0019.
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AbstractThe photocatalytic mixed crystal nano-TiO2 particles were incorporated with concrete by means of the internal doping method (IDM) and spraying method (SPM) in this paper. To evaluate the photocatalytic degradation efficiency of mixed crystal nano-TiO2 concrete, the methyl orange (MO) was chosen to simulate pollutants. The physicochemical characteristics and photocatalytic performance of mixed crystal nano-TiO2 concrete prepared by above two different methods were experimentally investigated under UV irradiation and solar irradiation. Furthermore, the effects of two key influential factors including pollutant concentration and irradiation condition were also analyzed and discussed. Experimental results indicate that the nano-TiO2 concrete prepared by the spraying method (SPM) exhibits maximum photocatalytic degradation efficiency of 73.82% when the sprayed nano-TiO2 slurry concentration is 10mg/L. The photocatalytic degradation efficiency of unpolished nano-TiO2 concrete is much higher than that of polished nano-TiO2 concrete under the same exposure time of UV irradiation. Moreover, the photocatalytic degradation efficiency of nano-TiO2 concrete decreases with the increase of pollutant concentration. The irradiation condition has an obvious influence on the photocatalytic degradation efficiency of nano-TiO2 concrete. In the aspect of applications, the practical recommendations for the nano-TiO2 concrete with self-cleaning capacity were presented according to the experimental results.
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Carmichael, Jemimah M., and Prince G. Arulraj. "Air Pressure Test on Concrete with Nano-Cement." Journal of Computational and Theoretical Nanoscience 16, no. 2 (February 1, 2019): 748–53. http://dx.doi.org/10.1166/jctn.2019.7803.
Full textAbstract:
Nanotechnology is an emerging area of research that has received a lot of attention for its ability to make use of the unique properties of nano-sized materials. The grain size of the nano particles will be in the order of 10–9 m (1–100 nm). Due to the very small particle size and extremely large specific surface area, nano particles have same remarkable properties. The use of nano materials for making concrete is of recent origin. Addition of nano materials in concrete can lead to significant improvements in the strength and durability of concrete. For nuclear power plants, concrete with high compressive strength, high split tensile strength, low porosity and high density are required. An attempt has been made to increase the compressive and split tensile strength of concrete by replacing a portion of cement with nano cement. M20, M30, M40 and M50 grades of concrete were cast. For each of these mixes, 10%, 20%, 30%, 40% and 50% of cement was replaced with nano- cement. Nano-cement was made by grinding the commercially available 53 grade pozzolona cement in the ball grinding mill. A scanning electron microscope was used to determine the particle size of the nano-cement produced. A hollow cylinder of the concrete was made with concrete containing nano materials. The Air pressure test was carried at on hardened concrete and the results were compared with that of normal cement concrete. The safe internal pressure for M50 concrete with 50% replacement of cement with nano-cement was found to be 13.3 kg/cm2, which 31.6% higher than that of the normal M50 concrete.
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Ngo, Van Thuc, Thanh Quang Khai Lam, Thi My Dung Do, and Trong Chuc Nguyen. "Nano concrete aggregation with steel fibers: A problem to enhance the tensile strength of concrete." E3S Web of Conferences 135 (2019): 03001. http://dx.doi.org/10.1051/e3sconf/201913503001.
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In Vietnam, nano technology began to be interested in research and development, typically the seminar program of production research, silicon nano applications from waste materials and investment projects to build silicon nano manufacturing in Ho Chi Minh City. Researching the properties and applications of nano concrete in Vietnam with the desire to apply to some types of bridge and road structures today and step by step research on nano concrete application in designing some structure of bridges, roads, and other special works. With new materials used to determine the mechanical properties of materials and the characteristics of destruction at the limit of failure is essential. Moreover, high strength concrete materials are often brittle, so it is necessary to study measures to increase the plasticity to obtain the structure to ensure the requirements of the bearing and nano concrete with steel fibers. Steel fibers will make nano concrete increase tensile resistance in concrete.
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Zhang, Mao Hua, and Hong Guang Wang. "Strength and Drying Shrinkage of Pavement Concrete with Nano-Particles." Advanced Materials Research 662 (February 2013): 182–85. http://dx.doi.org/10.4028/www.scientific.net/amr.662.182.
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With the development of national economy in Mainland China, the heavier vehicles and traffic flow have arisen in highway transportation. Concrete pavement has high strength and good durability, and thus is widely used in high-grade highway. Due to the small dimension, nano- materials have many unique physical and chemical properties, and become the focus of material science field. In this thesis, based on the unique characteristics of nano-materials, the ordinary concrete with nano-SiO2 or nano-TiO2 is prepared to research the drying shrinkage of pavement concrete. The test results indicate that the concrete with nano-SiO2 and nano-TiO2 in the amount of 2.0% and 1.0% by weight of binder have the respectively biggest drying shrinkage rate of the same concrete type, which are significantly increased than the ordinary concrete. After 28 days, the dying shrinkage rate of the concrete with nano-TiO2 is 1.6 times to the ordinary concrete.
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Srinivas, Bangaru Sai, and K. V. V. Rama Raju. "Strength Evaluation and Durability on Addition of Nanosilica in M30 Grade Concrete." International Journal for Research in Applied Science and Engineering Technology 10, no. 2 (February 28, 2022): 1430–37. http://dx.doi.org/10.22214/ijraset.2022.40537.
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Abstract: Nano technology plays a very vital role in all the areas of research. The incorporation of nano materials in concrete offers many advantages and improves the workability, the strength and durability properties of concrete. In this study an attempt has been made to carry out an experimental investigation on concrete in which cement was replaced with nano sized cement. Nano-silica has a unique advantage in the potential pozzolanic-reaction with cement hydration products over other nanoparticles. Addition of Nano-silica is known to redefine pore size and distribution which would alter the durability of the concrete. Ordinary Portland cement of 53 grade was ground in a ball grinding mill to produce nano cement. . Nano technology is an emerging field of interest for civil engineering utility. A few of the nano substances presently used in concrete, nano-silica very own greater pozzolanic nature. It has the functionality to react with the unfastened lime inside the route of the cement hydration and bureaucracy extra C-S-H gel giving strength, impermeability and durability to concrete. Present paper investigates the effects of addition of nano silica in normal strength of concrete. The present research deals with Partial alternative cement through nano silica powder as partial replacements in concrete at associate with various materials like OPC53 grade cement, fine aggregate, coarse aggregate to check their suitability for making concrete. The mix proportions of concrete were modified as micro silica (5%, 7.5%, 10%, 15%) and nano silica (1%, 1.5%, 2%, 2.5%) as partial replacement of cement. The cubes were cast by replacing Specimens were cast as per mix design and the tests are conducted after proper curing, the tests are compressive strength of cubes (150mm x 150mm x 150mm) and split tensile strength of cylinders (150mm x 300mm). The results had been compared with the outcomes of concrete specimens with 0% of nano silica. Keywords: M30 grade, nano silica, Nano technology,pozzolanic-reaction
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He, Rui, Xin Huang, Jiansong Zhang, Yao Geng, and Haidong Guo. "Preparation and Evaluation of Exhaust-Purifying Cement Concrete Employing Titanium Dioxide." Materials 12, no. 13 (July 7, 2019): 2182. http://dx.doi.org/10.3390/ma12132182.
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To address the increasing air pollution caused by vehicle exhaust, environment-friendly pavement materials that possesses exhaust-purifying properties were prepared using common cement concrete and porous cement concrete as the base of photocatalyst nano-titanium dioxide (TiO2), respectively. Firstly, Fe3+-doped TiO2 powder was prepared by applying planetary high-energy ball milling in order to improve the efficiency of the semiconductor photocatalyst for degrading vehicle exhausts. Two nano-TiO2, namely the original and modified nanomaterials, were adopted to produce the photocatalytic cement concretes subsequently. The physicochemical properties of the modified powder, as well as the mechanical and photocatalytic properties of TiO2-modified concrete, were characterized using a suite of complementary techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), compressive strength and degradation efficiency tests. The results show that the ball milling method not only successfully doped Fe3+ into catalysts but also caused significant changes in: (1) decreased particle sizes, (2) more amorphous morphology, (3) decreased percentage of the most thermodynamically stable crystal facet, and (4) increased percentage of other high gas sensing crystal facets. Both the original and modified nano-TiO2 can improve the concrete strength while the strengthening effect of modified nanomaterials is superior. It is pronounced that the photocatalytic property of the modified nano-TiO2 is much better than that of the original nano particles, and the degradation rate of porous concrete is also better than common concrete when exposed to the same photocatalyst content. In a comprehensive consideration of both mechanical performance and degradation efficiency, the recommended optimum dosage of TiO2 is 3% to 4% for exhaust-purifying concrete.
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Zhang, Shiyi, Yingfang Fan, and Surendra P. Shah. "Study on Deformation Characteristics and Damage Model of NMK Concrete under Cold Environment." Buildings 12, no. 9 (September 12, 2022): 1431. http://dx.doi.org/10.3390/buildings12091431.
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To improve the ability of concrete structures to resist freeze-thaw damage in cold environments, explore the effect and mechanism of nano-metakaolin (NMK) on frost resistance of concrete. And make up for the deficiencies in the mechanical properties and deformation process of na-no-metakaolin concrete in freeze-thaw environments. Rapid freeze-thaw cycle experiment was car-ried out to detect the deterioration law of concrete. Physical and mechanical properties under freeze-thaw environment was measured. The modification mechanism of nano-metakaolin on con-crete frost resistance from micro and meso scales was analyzed. The effect of freeze-thaw damage on nano-metakaolin concrete was characterized. The influence law of stress strain is established, and the meso-statistical damage constitutive model of nano-metakaolin concrete under freeze-thaw action is established. The results show that: Compared with other nano-clays, adding 5% nano-metakaolin can effectively slow down concrete’s freeze-thaw cracking and crack propagation. After 125 freeze-thaw cycles, the surface crack width of concrete mixed with 5% nano-metakaolin is only 0.1mm. Without freeze-thaw cycles, the compressive strength of concrete mixed with 3% nano-metakaolin is the highest, which is 28.75% higher than that of ordinary concrete; after 125 freeze-thaw cycles, the loss rate of compressive strength of concrete mixed with 5% nano-metakaolin was 12.07%. After 125 freeze-thaw cycles, the peak strain is 0.45 times that of concrete without NMK, and the peak stress is 3 times that of concrete without NMK.
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Zhuang, Chenglong, and Yu Chen. "The effect of nano-SiO2 on concrete properties: a review." Nanotechnology Reviews 8, no. 1 (December 31, 2019): 562–72. http://dx.doi.org/10.1515/ntrev-2019-0050.
Full textAbstract:
Abstract In recent years, the addition of nanometer materials to concrete materials has attracted a group of increasing number of scholars’ research interests, and nano-SiO2 is one of the research hotspots. In this paper, we briefly introduce the influence of nano-SiO2 on setting time, slump, shrinkage, durability and mechanical properties of concrete. In addition, this review also includes the microstructure measured by scanning electron microscope (SEM) and the content of various hydration products obtained by X-ray diffraction (XRD). The result shows that the setting time of nano-SiO2 concrete is shortened, the slump is reduced and the shrinkage is improved owing to the high activity and nucleation of nano-SiO2. The improvement effect of nano-SiO2 on concrete is remarkable, especially in the aspect of enhancing the durability of concrete. It should be noted that nano-SiO2 shows limited improvement in the mechanical properties of concrete. In the end, this literature summary explains the macro performance of nano-silica modified concrete through microstructure.
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Vandhiyan, R., and E. B. Perumal Pillai. "Influence of Nano Silica Addition on the Behavior of Concrete and Its Impact on Corrosion Resistance." Journal of Computational and Theoretical Nanoscience 15, no. 2 (February 1, 2018): 530–36. http://dx.doi.org/10.1166/jctn.2018.7116.
Full textAbstract:
Nano materials in concrete technology can lead to structures with improved quality and better lifecycle cost. Nano Silica is an aspiring material that can change the performance of concrete in many ways. Nano Silica being a new material requires a lot of study to understand the behavior of the concrete composite with Nano Silica. In this investigation Nano Silica was added in four different proportions as 0.5 wt%, 1 wt%, 1.5 wt% and 2 wt% of cement, into the concrete mix to study its performance. The mixture was tested for its consistency to understand the water demand and workability. It was observed that the water demand increased with increase in Nano Silica content and superplasticizer can be utilized to improve the workability without increasing the water to cement (W/C) ratios. The hardened concrete displayed enhancement in compressive strength, flexural strength and split tensile strength when Nano Silica was used. The best results were seen when 1.5 wt% Nano silica was added. The corrosion resistance property was studied applying impressed current technique, where the current consumption is allowed to increase with time. The Nano Silica improves the pore structure of the concrete, this leads to improved corrosion resistance in concrete with increase in Nano Silica content. The theoretical and experimental values of mass loss due to corrosion matched only after 80 hours of accelerated corrosion for normal concrete and 60 hours for enhanced concrete.
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Cheng, Youkun, and Zhenwu Shi. "Experimental Study on Nano-SiO2 Improving Concrete Durability of Bridge Deck Pavement in Cold Regions." Advances in Civil Engineering 2019 (February 14, 2019): 1–9. http://dx.doi.org/10.1155/2019/5284913.
Full textAbstract:
In order to reduce early damage of bridge deck pavement concrete in cold regions, a certain content of nano-SiO2 is added into the concrete to enhance its durability. Through tests on four durability indexes, strength, frost resistance, resistance to Cl− ion permeability, and abrasion resistance of concrete with 1% nano-SiO2 content and concrete without nano-SiO2, the ability of nano-SiO2 to improve the concrete durability of bridge deck pavement is evaluated. The results of tests and analysis show that the incorporation of nano-SiO2 greatly improves the four durability indexes. Nano-SiO2 effectively absorbs the calcium hydroxide released early by the hydration of cement, increases the calcium silicate hydrate content, and elevates the interface between the paste and aggregate of the hardened cement, which improves the durability of the concrete.
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Beskopylny, Alexey N., Sergey A. Stel’makh, Evgenii M. Shcherban’, Levon R. Mailyan, Besarion Meskhi, Valery Varavka, Nikita Beskopylny, and Diana El’shaeva. "A Study on the Cement Gel Formation Process during the Creation of Nanomodified High-Performance Concrete Based on Nanosilica." Gels 8, no. 6 (June 2, 2022): 346. http://dx.doi.org/10.3390/gels8060346.
Full textAbstract:
One of the most science-intensive and developing areas is nano-modified concrete. Its characteristics of high-strength, high density, and improved structure, which is not only important at the stage of monitoring their performance, but also at the manufacturing stage, characterize high-performance concrete. The aim of this study is to obtain new theoretical knowledge and experimental-applied dependencies arising from the “composition–microstructure–properties” ratio of high-strength concretes with a nano-modifying additive of the most effective type. The methods of laser granulometry and electron microscopy are applied. The existing concepts from the point of view of theory and practice about the processes of cement gel formation during the creation of nano-modified high-strength concretes with nano-modifying additives are developed. The most rational mode of the nano-modification of high-strength concretes is substantiated as follows: microsilica ground to nanosilica within 12 h. A complex nano-modifier containing nanosilica, superplasticizer, hyperplasticizer, and sodium sulfate was developed. The most effective combination of the four considered factors are: the content of nanosilica is 4% by weight of cement; the content of the superplasticizer additive is 1.4% by weight of cement; the content of the hyperplasticizer additive is 3% by weight of cement; and the water–cement ratio—0.33. The maximum difference of the strength characteristics in comparison with other combinations ranged from 45% to 57%.
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Fares, Galal, and Mohammad Iqbal Khan. "Nanosilica and its Future Prospects in Concrete." Advanced Materials Research 658 (January 2013): 50–55. http://dx.doi.org/10.4028/www.scientific.net/amr.658.50.
Full textAbstract:
The implementation of nanotechnology in concrete has led to an active incorporation of nano silica in concrete in a global level. Different methods of nano silica production are available and vary from expensive to cost-effective routes. Nano silica particle sizes and their chemical and physical nature depend on the method of production. Several types of dispersed nano silica are recommended to be used in concrete due to practical reason. However, the dry powders of nano silica particles are difficult to be dispersed in concrete and require special types or family of nano superplasticizers. The effective addition of nS leads to C-S-H with improved cementitious properties.
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Wang, Kai Sen, Ge Lin Dai, Fan Cheng Kong, and Guo Liang He. "Study on Dynamics Performance of Nano-Concrete." Applied Mechanics and Materials 217-219 (November 2012): 199–202. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.199.
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Based on static and dynamic compression tests of plain concrete, SiO2(NS) concrete, CaCO3(NC) concrete and composite concrete with different NS-NC contents, dynamics performance of nano-concrete materials is analyzed to study influence factors and find the optimum nano-content.
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Kumar, Kakara S. J., M. V. Seshagiri Rao, V. Srinivasa Reddy, and S. Shrihari. "Performance evaluation of nano-silica concrete." E3S Web of Conferences 184 (2020): 01076. http://dx.doi.org/10.1051/e3sconf/202018401076.
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In this paper, the study of the influence of nano-silica (nano-SiO2) on the properties of the interface between CSH gel and cement particles and its effect on nano-mechanical properties of the products at the interface zone was examined. In this paper M50 grade SCC mixes were developed using 5% micro-silica and various percentages of 0.5%, 1.0% and 1.5% nano-SiO2. For 1.0% nano-SiO2 addition to M50 grade SCC mix, the compressive strength is maximum. Similarly concrete quality using non-destructive techniques, water absorbtion capacity and porosity are also assessed.
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Yang, Jiangong. "Effect of nano CaCO3 on durability of concrete." E3S Web of Conferences 165 (2020): 03029. http://dx.doi.org/10.1051/e3sconf/202016503029.
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Through comparatively analyzing the impermeability and compressive strength test data of nano CaCO3 concrete with different content, this paper puts forward the method of optimizing the durability of nano CaCO3 concrete, and studies the influence of the content of fly ash on the durability of nano CaCO3 concrete on this basis, so as to provide a reference for improving the durability of concrete, so as to improve the recycling and reusing efficiency of building materials, and accelerate the practical application of nano CaCO3 concrete in engineering.
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Chen, Xixiang, and Yu Chen. "Experimental Study on Damage Identification of Nano-SiO2 Concrete Filled GFRP Tube Column Using Piezoceramic Transducers." Sensors 20, no. 10 (May 19, 2020): 2883. http://dx.doi.org/10.3390/s20102883.
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This paper proposes a new approach to damage detection of nano-SiO2 concrete-filled glass fiber reinforced polymer (GFRP) tube column using piezoceramic transducers. Stress waves are emitted and received by a pair of piezoceramic transducers embedded in the concrete-filled GFRP tube, and the energy and damage indices at different levels of loading in the tube are obtained by wavelet packet to evaluate the damage degree of GFRP tube nano-SiO2 concrete column. Through the experimental studies, the effects of different nano-SiO2 contents, concrete grades, and superplasticizer on the damage were analyzed to gain load–displacement curves, load–energy index curves, and load–damage index curves. The results show that the wave method can be adopted to monitor the damage of GFRP tube nano-SiO2 concrete column. The specimens with 3% nano-SiO2 content have the smallest energy change rate, indicating that adding 3% nano-SiO2 content into concrete can effectively delay the development of damage. After the addition of superplasticizer, with the increase in the strength grade of concrete, the cracks in the specimen tend to develop slowly, and therefore the specimens have a stronger resistance to damage. The damage of the specimens with the nano-SiO2 content of 1% appeared the latest, while the damage without the nano-SiO2 specimen appeared the fastest. The experimental results show that this method can better monitor the damage of the Nano-SiO2 concrete in the glass fiber reinforced polymer (GFRP) tube.
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Zhang, Pengyu, Ning Xie, Xin Cheng, Lichao Feng, Pengkun Hou, and Yunpeng Wu. "Low dosage nano-silica modification on lightweight aggregate concrete." Nanomaterials and Nanotechnology 8 (January 1, 2018): 184798041876128. http://dx.doi.org/10.1177/1847980418761283.
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Although the nano modification has been considered as a promising approach to enhance the mechanical properties of cement-based concrete, the investigation of low dosage nano modification on lightweight cement-based concrete is still very limited. In this study, the lightweight concrete, which was modified with low dosage nano-silica particles, were investigated. Non-prewetting and prewetting methods were used to prepare the lightweight concrete samples. The compressive and flexural strengths were tested to evaluate the modification effects of low dosage nano-silica on lightweight concrete. The microstructure analyses demonstrate that the hydration process of the cement paste can be changed with addition of nano-silica, and new types of hydration products have been observed in nano modified cementitious matrix. The interface between the lightweight aggregates and the cement paste can be reinforced by low dosage of nano-silica due to the new types of hydration products. However, relatively high dosage of nano-silica will reduce the modification effect because of the internal stress, which is resulted from the volume expansion of the new types of hydration product, at the interface of the lightweight aggregates and the cement paste. This study not only shows the possibility of low dosage nano modification on the mechanical properties enhancement of lightweight concrete but also provides potential modification mechanisms, which help to design and fabricate high-performance lightweight concrete materials.
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Qian, Kuang Liang, Tao Meng, Xiao Qian Qian, and Shu Lin Zhan. "Research on Some Properties of Fly Ash Concrete with Nano-CaCO3 Middle Slurry." Key Engineering Materials 405-406 (January 2009): 186–90. http://dx.doi.org/10.4028/www.scientific.net/kem.405-406.186.
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Some long-term properties such as anti-carbonation properties, shrinkage, penetrability of chloride ion of fly ash concrete with nano-CaCO3 middle slurry were studied. Test results showed that the properties of anti-carbonation and impenetrability for chloride of fly ash concrete increased by adding nano-CaCO3 middle slurry because the tiny hole was filled by nano-CaCO3 and the density of concrete increased. But at the same time, the shrinkage of fly ash concrete with and without nano-CaCO3 was the same. Results of SEM also implied the hydration degree of fly ash could be increased by nano-CaCO3.
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Abd-elmagied, Mohamad Farouk. "Influence of Different Nano Materials on Mechanical Properties of Plain Concrete." European Journal of Engineering Research and Science 4, no. 6 (June 28, 2019): 129–34. http://dx.doi.org/10.24018/ejers.2019.4.6.1389.
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This research aims to study the influences of three types of Nano materials on concrete compressive strength, considered Nano types were Nano-Iron Oxide Fe2O3 (NF), Nano-Manganese Oxide Mn2O3 (NM), and Nano-Silica SiO2 (NS). A constant concrete mix and water content were considered. The used percentages of different types of (NF, NM, and NS) that replaced by the cement content were (0.5, 1.0, 2.0, and 5.0%) of mixture weight (wt). The results demonstrated that the (NS) Nano type has better effect than other types on the concrete compressive strength.
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Abd-elmagied, Mohamad Farouk. "Influence of Different Nano Materials on Mechanical Properties of Plain Concrete." European Journal of Engineering and Technology Research 4, no. 6 (June 28, 2019): 129–34. http://dx.doi.org/10.24018/ejeng.2019.4.6.1389.
Full textAbstract:
This research aims to study the influences of three types of Nano materials on concrete compressive strength, considered Nano types were Nano-Iron Oxide Fe2O3 (NF), Nano-Manganese Oxide Mn2O3 (NM), and Nano-Silica SiO2 (NS). A constant concrete mix and water content were considered. The used percentages of different types of (NF, NM, and NS) that replaced by the cement content were (0.5, 1.0, 2.0, and 5.0%) of mixture weight (wt). The results demonstrated that the (NS) Nano type has better effect than other types on the concrete compressive strength.
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Huang, Miao Zhou, Tao Meng, Xiao Qian Qian, and Jin Jian Zhang. "Influence of Nano-SiO2 and Nano-CaCO3 on the Mechanical Properties of Concrete with Different Strength Grades." Advanced Materials Research 250-253 (May 2011): 480–84. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.480.
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The flow ability, mechanical properties and microstructure of concrete with different strength grades affected by nano-SiO2and nano-CaCO3was studied. The experiment results showed that the strength of concrete at early age was increased by adding the nano-materials if the strength grade of concrete was not high. But the strength at the age of 28 days was not affected a lot by adding these nano-materials. On the other hand, it was not useful to the strength if the strength grade of concrete was high.
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Deng, Zhi Yong. "Mechanical Properties Research on Concrete Block Doped Nano-TiO2 under the Conditions of Common Conservation." Applied Mechanics and Materials 238 (November 2012): 9–12. http://dx.doi.org/10.4028/www.scientific.net/amm.238.9.
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As a new high performance construction material, concrete doped nano-TiO2 greatly expanded its application in engineering with the advantages of high strength and high durability. By compressive test of concrete block doped nano-TiO2 under the conditions of common conservation, this paper respectively studies the regulation of compressive properties of the concrete block affected by the factors such as concrete strength and nano-TiO2 dioxide.
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Mohd Ibrahim, Mohd Yusak, Putra Jaya Ramadhansyah, Hainin Mohd Rosli, Mohd Haziman Wan Ibrahim, and M. N. Fadzli. "Utilization of Nano Silica as Cement Paste in Mortar and Porous Concrete Pavement." Advanced Materials Research 1113 (July 2015): 135–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1113.135.
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The high percentage of porosity in porous concrete pavement tends to decrease its strength. In concrete industry, nano silica is one of the most popular materials that will improve the properties of cementitious materials. This paper, prepared to review the effect of nano silica in cement paste and mortar related to porous concrete pavement. It was found that, by incorporating nano silica with the right composition in cement paste and mortar, it will improve their mechanical properties. By incorporating nano silica in the mixture, it can be predicted that the strengthening effect of nano silica would be further enhanced in porous concrete because the nano silica improve not only the cement paste, but also the interface between paste and aggregate.
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Mussa, Mohamed H., Ahmed M. Abdulhadi, Imad Shakir Abbood, Azrul A. Mutalib, and Zaher Mundher Yaseen. "Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres." Crystals 10, no. 4 (March 26, 2020): 243. http://dx.doi.org/10.3390/cryst10040243.
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The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age, the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101.42 s−1. At room temperature, the results indicated that the dynamic compressive strength of plain concrete (PC) was slightly higher than HVFANS concrete at early curing ages of 7 and 28 days, however, a considerable improvement in the strength of HVFANS concrete was noted at a curing age of 90 days and recorded greater values than PC owing to the increase of fly ash reactivity. At elevated temperatures, the HVFANS concrete revealed a superior behaviour than PC even at early ages in terms of dynamic compressive strength, critical strain, damage and toughness due to increase of nano-silica (NS) activity during the heating process. Furthermore, equations were suggested to estimate the dynamic increase factor (DIF) of both concretes under the investigated factors.
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D, Raghavendra Prasad H., Nagaraj Sitaram, Pavan P. S, and Dushyanth V. BABU R. "Economical Concrete Cube Prepared Using Different Types of Nano-Material for Sustainable Construction." ECS Transactions 107, no. 1 (April 24, 2022): 10509–17. http://dx.doi.org/10.1149/10701.10509ecst.
Full textAbstract:
In this research work concrete cube has been prepared by doing partial replacement for cement using nano materials like Multi-Walled Carbon Nano Tubes (MWCNTs), titanium dioxide (TiO2), and copper oxide (CuO) at different percentages like 0.1, 0.25, and 0.5%. Basic test has been done for materials and fresh concrete, followed by compressive strength test for concrete cubes. MWCNT gives more result compare to TiO2 and CuO. Just to reduce cement usage, fly ash has been used by keeping the compressive strength and the amount of nano materials as constant up to 35% of MWCNTs, TiO2, and CuO, with fly ash replaced for cement to obtain the normal strength. Cost analysis has been done to find out the economic efficiency of nano material concrete cube due to which TiO2 with fly ash cost 14.45Rs to prepare single cube, as MWCNTs and CuO with fly ash cost 726.4 and 17.64Rs to prepare single concrete cube. Almost TiO2 cube preparation took 10% reduction for the preparation of concrete cube compare to normal concrete cube has taken 15.96Rs. So we concluded that TiO2 with fly ash nano material concrete is the economical efficient concrete compared to MWCNTs and CuO with fly ash.
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Chen, Luchuan, Wenjun Gu, and Xuanyu Zhang. "Environment Effect on the Rutting Resistance of Nano-SiO2-Modified Asphalt Concrete: Temperature and Water." Advances in Civil Engineering 2021 (August 12, 2021): 1–9. http://dx.doi.org/10.1155/2021/7439006.
Full textAbstract:
Nanoparticles have been widely adopted to improve the high-temperature performance of asphalt binder. However, the influence of moisture on high-temperature performance is not clear. Hence, the water absorption performance of the nano-SiO2-modified asphalt concrete is investigated. Based on this, to further analyze the pavement performance of the nano-SiO2-modified asphalt concrete, the coupled effects of high-temperature, moisture content, and nanoparticles content on the rutting resistance of the nano-SiO2-modified asphalt concrete are tested and revealed in this study. Results show that temperature has the most significant influence on the water absorption performance of the nano-SiO2-modified asphalt concrete. The rutting resistance of the nano-SiO2-modified asphalt concrete decreases as temperature and moisture content increase, especially for the temperature. The dynamic stability at the same temperature condition decreases approximately linearly as moisture content increases. The effect of the nano-SiO2 content is the most nonobvious.