Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

被引:5
|
作者
Yang, Bowei [1 ]
Wang, Chen [1 ,2 ]
Chen, Song [1 ,3 ]
Qiu, Kaixin [1 ]
Jiang, Jiuhong [1 ]
机构
[1] Hubei Univ Technol, Coll Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China
[2] China Construct Seventh Engn Div Co Ltd, Zhengzhou 450003, Peoples R China
[3] China Construct Third Engn Bur Shenzhen Co Ltd, Shenzhen 518000, Peoples R China
关键词
ECC; PE; CWs; CNTs; response surface method; HIGH-PERFORMANCE CONCRETE; WHISKERS;
D O I
10.3390/polym15173531
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Engineered cementitious composites (ECCs) are cement-based composite materials with strain-hardening and multiple-cracking characteristics. ECCs have multiscale defects, including nanoscale hydrated silicate gels, micron-scale capillary pores, and millimetre-scale cracks. By using millimetre-scale polyethylene (PE) fibres, microscale calcium carbonate whiskers (CWs), and nanoscale carbon nanotubes (CNTs) as exo-doped fibres, a multiscale enhancement system was formed, and the effects of multiscale fibres on the mechanical properties of ECCs were tested. The Box-Behnken experimental design method, which is a response surface methodology, was used to construct a quadratic polynomial regression equation to optimise ECC design and provide an optimisation of ECC mix proportions. The results of this study showed that a multiscale reinforcement system consisting of PE fibres, CWs, and CNTs enhanced the mechanical properties of ECCs. CWs had the greatest effect on the compressive strengths of highly ductile-fibre-reinforced cementitious composites, followed by CNTs and PE fibres. PE fibres had the greatest effect on the flexural and tensile strengths of high-ductility fibre-reinforced cementitious composites, followed by CWs and CNTs. The final optimisation results showed that when the ECC matrix was doped with 1.55% PE fibres, 2.17% CWs, and 0.154% CNTs, the compressive strength, flexural strength, and tensile strength of the matrix were optimal.
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页数:21
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