The Experts below are selected from a list of 28389 Experts worldwide ranked by ideXlab platform
Dusan Losic - One of the best experts on this subject based on the ideXlab platform.
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physiochemical and mechanical properties of reduced graphene oxide Cement Mortar composites effect of reduced graphene oxide particle size
Construction and Building Materials, 2020Co-Authors: Meisam Valizadeh Kiamahalleh, Aliakbar Gholampour, Diana N H Tran, Togay Ozbakkaloglu, Dusan LosicAbstract:Abstract The use of graphene derivatives to improve the performance of Cement Mortar composites has received significant attention in recent years. However, because of diversity of graphene derivatives and their properties, which depend on their preparation, it is critical to consider their size, surface chemistry, crystallinity, surface area, and impurity. In particular, there is still lack of understanding on the influence of the graphene particle size on the performance of Cement Mortar composite. This paper presents the study on the size effect of reduced graphene oxide (rGO) on physiochemical and mechanical properties of Cement Mortar composites. A series of rGOs with different particle sizes were prepared by different sonication times of 1, 2, 4, 6, and 8 h and then added with optimum dosage of 0.1% to the composites. The mechanical test results revealed that the composite containing rGO with 0.1% dosage and particle size of 169.8 ± 5.8 nm prepared with 4 h sonication time has 53% and 91% higher tensile and compressive strengths at 28 days than the plain Cement Mortar composite, respectively, which are higher than those obtained by the use of rGO with particle size of 245.0 ± 29.3 nm prepared with 1 h sonication time. This is explained by the higher molecular bonding, hydration degree, and crystallinity of the composite incorporating rGO with a smaller particle size. This study provides a valuable contribution toward better understanding of the influence of rGO particle size on the properties of Cementitious composites to optimize their performance.
Chi Sun Poon - One of the best experts on this subject based on the ideXlab platform.
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Effects of particle size of treated CRT funnel glass on properties of Cement Mortar
Materials and Structures, 2013Co-Authors: Tungchai Ling, Chi Sun PoonAbstract:Over the last decade, new types of display technologies have increasingly replaced cathode ray tube (CRT) displays leading to an increase in the disposal of discarded old CRT monitors and TV sets. The present study is a further development of our previous work to explore the effects of using different size fractions of crushed CRT glass as 100 % substitution of sand in Cement Mortar. A range of Cement Mortar mixes were prepared and the tests conducted included table flow (fluidity), mechanical strength, drying shrinkage, alkali–silica reaction (ASR) expansion and toxicity characteristic leaching procedures. Generally, the results obtained for the CRT glass-based Cement Mortars were comparable to those of the beverage glass Mortars except the hardened density due to the presence of lead in the CRT glass. Decreasing the particle size of the CRT glass led to a decrease in fluidity, compressive strength and water absorption. However, the use of finer glass particles slightly improved the flexural strength and reduced the risk of expansion due to ASR due to its pozzolanic reaction. The experimental results indicated that treated CRT glass can be utilized as 100 % replaCement of sand in Cement Mortar regardless of its particle size.
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utilization of recycled glass derived from cathode ray tube glass as fine aggregate in Cement Mortar
Journal of Hazardous Materials, 2011Co-Authors: Tungchai Ling, Chi Sun PoonAbstract:Abstract Rapid advances in the electronic industry led to an excessive amount of early disposal of older electronic devices such as computer monitors and old televisions (TV) before the end of their useful life. The management of cathode ray tubes (CRT), which have been a key component in computer monitors and TV sets, has become a major environmental problem worldwide. Therefore, there is a pressing need to develop sustainable alternative methods to manage hazardous CRT glass waste. This study assesses the feasibility of utilizing CRT glass as a substitute for natural aggregates in Cement Mortar. The CRT glass investigated was an acid-washed funnel glass of dismantled CRT from computer monitors and old TV sets. The mechanical properties of Mortar mixes containing 0%, 25%, 50%, 75% and 100% of CRT glass were investigated. The potential of the alkali-silica reaction (ASR) and leachability of lead were also evaluated. The results confirmed that the properties of the Mortar mixes prepared with CRT glass was similar to that of the control Mortar using sand as fine aggregate, and displayed innocuous behaviour in the ASR expansion test. Incorporating CRT glass in Cement Mortar successfully prevented the leaching of lead. We conclude that it is feasible to utilize CRT glass in Cement Mortar production.
Meifeng Cai - One of the best experts on this subject based on the ideXlab platform.
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Modification and in-place mechanical characteristics research on Cement Mortar with fly ash and lime compound admixture in high chlorine environment
Elsevier, 2019Co-Authors: Kouame Joseph Arthu Kouame, Peng Yang, Meifeng CaiAbstract:As industrial waste, the comprehensive utilization of fly ash involves many fields, among which it is widely used in Cement Mortar and concrete. As brine water is used in the preparation of filling slurry of Sanshandao Gold Mine, the chloride ions in the slurry have a great negative effect on the strength of the backfill. Therefore, the effects of fly ash and lime on the transport performance and the mechanical properties of Cement Mortar test blocks were studied by experiment. Based on fly ash XRD analysis, Cement Mortar block scanning electron microscope test (SEM) and fly ash with various amount and different way of adding test, the mechanism of improving the strength of the Cement Mortar test block produced by the fly ash and the best mixing amount of the fly ash were determined under the condition of brine water through experiment and theoretical research. Application of fly ash in undersea metal mine is a major breakthrough in the application of filling materials of metal mine undersea metal filling, having great effect on reducing the adverse effects on the strength of the filling body of bittern ions and improving the strength of the filling body. Keywords: Cement Mortar, Brine water, Fly ash, Compressive strengt
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modification and in place mechanical characteristics research on Cement Mortar with fly ash and lime compound admixture in high chlorine environment
Journal of materials research and technology, 2019Co-Authors: Kouame Joseph Arthu Kouame, Peng Yang, Meifeng Cai, Bingqian YanAbstract:Abstract As industrial waste, the comprehensive utilization of fly ash involves many fields, among which it is widely used in Cement Mortar and concrete. As brine water is used in the preparation of filling slurry of Sanshandao Gold Mine, the chloride ions in the slurry have a great negative effect on the strength of the backfill. Therefore, the effects of fly ash and lime on the transport performance and the mechanical properties of Cement Mortar test blocks were studied by experiment. Based on fly ash XRD analysis, Cement Mortar block scanning electron microscope test (SEM) and fly ash with various amount and different way of adding test, the mechanism of improving the strength of the Cement Mortar test block produced by the fly ash and the best mixing amount of the fly ash were determined under the condition of brine water through experiment and theoretical research. Application of fly ash in undersea metal mine is a major breakthrough in the application of filling materials of metal mine undersea metal filling, having great effect on reducing the adverse effects on the strength of the filling body of bittern ions and improving the strength of the filling body.
M C Tsai - One of the best experts on this subject based on the ideXlab platform.
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effects of nano sio2 and different ash particle sizes on sludge ash Cement Mortar
Journal of Environmental Management, 2008Co-Authors: Kae-long Lin, W C Chang, D F Lin, Huanlin Luo, M C TsaiAbstract:The effects of nano-SiO2 on three ash particle sizes in Mortar were studied by replacing a portion of the Cement with incinerated sewage sludge ash. Results indicate that the amount of water needed at standard consistency increased as more nano-SiO2 was added. Moreover, a reduction in setting time became noticeable for smaller ash particle sizes. The compressive strength of the ash–Cement Mortar increased as more nano-SiO2 was added. Additionally, with 2% nano-SiO2 added and a cure length of 7 days, the compressive strength of the ash–Cement Mortar with 1 μm ash particle size was about 1.5 times better that of 75 μm particle size. Further, nano-SiO2 functioned to fill pores for ash–Cement Mortar with different ash particle sizes. However, the effects of this pore-filling varied with ash particle size. Higher amounts of nano-SiO2 better influenced the ash–Cement Mortar with larger ash particle sizes.
Jinmiao Tan - One of the best experts on this subject based on the ideXlab platform.
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heat storage properties of the Cement Mortar incorporated with composite phase change material
Applied Energy, 2013Co-Authors: Jinmiao TanAbstract:An experimental study is presented on the Cement Mortar incorporated with expanded graphite (EG)/paraffin composite phase change material (PCM). The composite PCM was prepared by absorbing paraffin into EG with vacuum absorption method. The heat storage Cement Mortar (HSCM) with proper mass fraction of the composite PCM was prepared. A testing device was designed for evaluating the heat storage effect of HSCM. Temperature variation and heat storage coefficient of HSCM were compared to those of the ordinary Cement Mortar (OCM). For a cubic with one HSCM board and a cubic with one OCM board, the maximum indoor center temperature difference is 2.2K during the heat storage and 1.5K during the heat release process. The heat storage coefficient of HSCM board is 1.74 times of that of OCM board. The results indicate that the HSCM board has good heat storage property.