Mechanical Properties of High Cost Performance Hybrid Fiber Engineered Cementitious Composites

Abstract

Abstract: In order to improve the economic applicability of engineered cementitious composites (ECC) and ensure its good tensile ductility, the preparation method of PVA-ECC was studied, and PVA-ECC with high cost performance was prepared to provide more material selection for practical engineering. Firstly, based on the micro-mechanical model and multi-scale structural characteristics of ECC, the optimization direction of ECC mix ratio was determined. Then, the uniaxial compression test and uniaxial tensile test were carried out by designing 12 groups of ECC specimens with different mix ratios. The effects of silica fume, cement -fly ash ratio, water-binder ratio, PVA fiber type and CaCO₃ whisker on the mechanical properties of ECC were studied, and the optimal mix ratio of hybrid fiber cement-based composites was determined. Finally, the economic value of the hybrid fiber engineered cementitious composites prepared in this paper was compared and analyzed by the value engineering method. According to its cost and performance, three representative mix ratios were proposed: H12 with low cost, relatively low tensile ductility and reinforced by domestic PVA fibers, H11 with moderate cost, relatively high tensile ductility and reinforced by hybrid PVA fibers and H8 with high cost, high tensile ductility and reinforced by Japanese PVA fibers and CaCO₃ whisker. This study can provide data reference for achieving the dual goals of mechanical performance optimization and economic improvement.

Key words: engineered cementitious composite, PVA fiber, CaCO₃whisker, mechanical property, economic value

CLC Number:

TU502⁺.6

ZHANG Pinle, ZHU Haotian, HU Jing, ZENG Jingyuan, TAO Zhong. Mechanical Properties of High Cost Performance Hybrid Fiber Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3816-3826.

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