The Experts below are selected from a list of 79863 Experts worldwide ranked by ideXlab platform

Yunhua Cui - One of the best experts on this subject based on the ideXlab platform.

  • Comparative study on the effect of synthetic fiber on the preparation and durability of airport pavement concrete
    Construction and Building Materials, 2018
    Co-Authors: Yue Chen, Guoping Cen, Yunhua Cui
    Abstract:

    Abstract In order to improve the durability of airport pavement concrete, four kinds of synthetic fiber reinforced concrete were researched in this paper. Modified polyester synthetic fiber concrete (MPFC), Monofilament polypropylene synthetic fiber reinforced concrete (MPSFC), Reticular polypropylene synthetic fiber reinforced concrete (RPFC), and Polyacrylonitrile synthetic fiber reinforced concrete (PSFC) were prepared in this paper. Strength, Impermeability and frost resistance of them were investigated. The Impermeability test was carried out by hydrostatic pressure and chloride ion penetration method, while the frost resistance test was conducted by quick freezing method. The results show that the synthetic fiber improves concrete flexural strength, but it has little effect on compressive strength. Under the same volume fraction (0.1%), the flexural strength of MPFC and PSFC increased by about 6% compared with that of ordinary concrete (PC), but the flexural strength of PSFC increased slightly, with only 1–2%. Single fiber can improve concrete Impermeability and frost resistance. Among them PSFC Impermeability is the best, which is 2.4 times of that of PC, up to P24; the frost resistance of MPFC is the best, which is 2 times of that of PC, reaching F350. Polycarboxylic synthetic water-reducer (SDJ) can improve concrete Impermeability and frost resistance greatly. It has best Impermeability when mixing with polyacrylonitrile fiber, and its frost resistance grades were all up to above F600 when mixing with the four kinds of fibers separately. It is suggested that the optimum volume fraction is 0.10–0.14%, as the fiber content also has certain influence on the performance of the synthetic fiber concrete. At last, the Cost-benefit analysis of the fiber reinforced concrete was put forward, which showed that the application of fiber concrete in the airport pavement engineering has great economic benefits and broad prospects for development.

Yue Chen - One of the best experts on this subject based on the ideXlab platform.

  • Comparative study on the effect of synthetic fiber on the preparation and durability of airport pavement concrete
    Construction and Building Materials, 2018
    Co-Authors: Yue Chen, Guoping Cen, Yunhua Cui
    Abstract:

    Abstract In order to improve the durability of airport pavement concrete, four kinds of synthetic fiber reinforced concrete were researched in this paper. Modified polyester synthetic fiber concrete (MPFC), Monofilament polypropylene synthetic fiber reinforced concrete (MPSFC), Reticular polypropylene synthetic fiber reinforced concrete (RPFC), and Polyacrylonitrile synthetic fiber reinforced concrete (PSFC) were prepared in this paper. Strength, Impermeability and frost resistance of them were investigated. The Impermeability test was carried out by hydrostatic pressure and chloride ion penetration method, while the frost resistance test was conducted by quick freezing method. The results show that the synthetic fiber improves concrete flexural strength, but it has little effect on compressive strength. Under the same volume fraction (0.1%), the flexural strength of MPFC and PSFC increased by about 6% compared with that of ordinary concrete (PC), but the flexural strength of PSFC increased slightly, with only 1–2%. Single fiber can improve concrete Impermeability and frost resistance. Among them PSFC Impermeability is the best, which is 2.4 times of that of PC, up to P24; the frost resistance of MPFC is the best, which is 2 times of that of PC, reaching F350. Polycarboxylic synthetic water-reducer (SDJ) can improve concrete Impermeability and frost resistance greatly. It has best Impermeability when mixing with polyacrylonitrile fiber, and its frost resistance grades were all up to above F600 when mixing with the four kinds of fibers separately. It is suggested that the optimum volume fraction is 0.10–0.14%, as the fiber content also has certain influence on the performance of the synthetic fiber concrete. At last, the Cost-benefit analysis of the fiber reinforced concrete was put forward, which showed that the application of fiber concrete in the airport pavement engineering has great economic benefits and broad prospects for development.

Huigang Xiao - One of the best experts on this subject based on the ideXlab platform.

  • role of nano sio2 in improving the microstructure and Impermeability of concrete with different aggregate gradations
    Construction and Building Materials, 2018
    Co-Authors: Huigang Xiao, Rui Liu, Fengling Zhang, Min Liu
    Abstract:

    Abstract Permeability is a significant and key property of concrete, and aggregate gradation is one factor that can affect the properties of concrete. Therefore, the aim of this study is to explore the improvement characteristics of nano-SiO2 on the microstructure and Impermeability of concrete with different aggregate gradations. Two innovative test procedures have been applied in this research to obtain the parameters related to permeability: water permeability and real-time monitoring of water sorptivity. In addition, kernel density estimation and step function fitting are used to statistically characterize and quantify the microstructure features of samples. The results reveal that different aggregate gradations induce diverse types of defects. When the Fuller exponent (q) ranges from approximately 0.4–1.0, the microstructure of concrete is the densest and the Impermeability is the strongest, in the meantime, the roles of nano-SiO2 become much clearer in weakening the connectivity of microdefects and improving the Impermeability of concrete.

  • Effects of nano-SiO2 on the permeability-related properties of cement-based composites with different water/cement ratios
    Journal of Materials Science, 2018
    Co-Authors: Rui Liu, Zhenyu Pi, Ghulam Qadir Waqar, Tao Du, Huigang Xiao, Hui Li, Li Sun, Lei Yu
    Abstract:

    To find the suitable conditions under which nano-SiO2 can exhibit a significant Impermeability enhancement effect and the mechanism underlying this effect, comparisons between the permeability-related properties of a nano-SiO2-filled cement paste and those of a reference cement paste composed of different water/cement (W/C) ratios were carried out in this research. Permeability-related properties of cement paste, such as the chloride-ion penetration coefficient (Dnssm), water permeability coefficient (Kp), and initial water sorptivity coefficient (Si), were tested. Furthermore, Power’s model, mercury intrusion porosimetry data, and the general effective media theory were also applied to analyse the evolution mechanism. The results indicate that the effect of nano-SiO2 on the enhancement of the Impermeability becomes more remarkable at a lower W/C ratio. The decreasing rates of Dnssm, Kp, and Si increase as the W/C ratio decreases. Furthermore, it can be concluded that the effects of nano-SiO2 on promoting the hydration, refining the pore structure, narrowing the width of microcrack and thus enhancing the Impermeability of cement paste become much clearer as the W/C ratio decreases.

Rui Liu - One of the best experts on this subject based on the ideXlab platform.

  • role of nano sio2 in improving the microstructure and Impermeability of concrete with different aggregate gradations
    Construction and Building Materials, 2018
    Co-Authors: Huigang Xiao, Rui Liu, Fengling Zhang, Min Liu
    Abstract:

    Abstract Permeability is a significant and key property of concrete, and aggregate gradation is one factor that can affect the properties of concrete. Therefore, the aim of this study is to explore the improvement characteristics of nano-SiO2 on the microstructure and Impermeability of concrete with different aggregate gradations. Two innovative test procedures have been applied in this research to obtain the parameters related to permeability: water permeability and real-time monitoring of water sorptivity. In addition, kernel density estimation and step function fitting are used to statistically characterize and quantify the microstructure features of samples. The results reveal that different aggregate gradations induce diverse types of defects. When the Fuller exponent (q) ranges from approximately 0.4–1.0, the microstructure of concrete is the densest and the Impermeability is the strongest, in the meantime, the roles of nano-SiO2 become much clearer in weakening the connectivity of microdefects and improving the Impermeability of concrete.

  • Effects of nano-SiO2 on the permeability-related properties of cement-based composites with different water/cement ratios
    Journal of Materials Science, 2018
    Co-Authors: Rui Liu, Zhenyu Pi, Ghulam Qadir Waqar, Tao Du, Huigang Xiao, Hui Li, Li Sun, Lei Yu
    Abstract:

    To find the suitable conditions under which nano-SiO2 can exhibit a significant Impermeability enhancement effect and the mechanism underlying this effect, comparisons between the permeability-related properties of a nano-SiO2-filled cement paste and those of a reference cement paste composed of different water/cement (W/C) ratios were carried out in this research. Permeability-related properties of cement paste, such as the chloride-ion penetration coefficient (Dnssm), water permeability coefficient (Kp), and initial water sorptivity coefficient (Si), were tested. Furthermore, Power’s model, mercury intrusion porosimetry data, and the general effective media theory were also applied to analyse the evolution mechanism. The results indicate that the effect of nano-SiO2 on the enhancement of the Impermeability becomes more remarkable at a lower W/C ratio. The decreasing rates of Dnssm, Kp, and Si increase as the W/C ratio decreases. Furthermore, it can be concluded that the effects of nano-SiO2 on promoting the hydration, refining the pore structure, narrowing the width of microcrack and thus enhancing the Impermeability of cement paste become much clearer as the W/C ratio decreases.

Song Yan - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Research on Impermeability of Crumb Rubber Lightweight Concrete
    Bulletin of the Chinese ceramic society, 2014
    Co-Authors: Song Yan
    Abstract:

    In order to study the permeability of rubber lightweight aggregate concrete,through the combination of the penetration height method and electron microscope scanning test method to analysis the rubber aggregate content,particle size and rubber aggregate concrete compressive strength and pore structure of concrete permeability. Experimental results showed that in the same rubber content,rubber particle size,capacity of rubber concrete resistance to penetration of more strong; while in the rubber particle size is the same,Impermeability also increased with the addition of rubber concrete,lightweight aggregate concrete strength has obviously difference with the anti permeability relationship the performance between the ordinary concrete,rubber aggregate,improve the pore structure of the concrete,Impermeability is improved; the permeability of crumb rubber concrete regression equation which we can estimate permeability of crumb rubber concrete height value has the actual guiding sense to the project.