Performance of Silane Coupling Agent Modified Polypropylene Fiber Cement-Based Composites

Abstract

Abstract: In this paper, different types (KH550 and KH560) and different concentrations (0.5%, 1.0%, 1.5% and 2.0%, mass fraction) of SCA were used to modify the surface of polypropylene fiber (PPF). The bearing capacity of SCA modified polypropylene fiber cement-based composites was studied by unconfined compressive strength test and flexural test, and the modified polypropylene fiber cement-based composites were characterized by scanning electron microscopy. The results show that KH560 modified polypropylene fiber has a great influence on the fluidity of cement-based composites, followed by KH550. On the whole, the closer the SCA concentration is to 1.5%, the greater the influence on the fluidity of polypropylene fiber cement-based composites is. With the increase of KH550 concentration, the porosity of cement-based composites generally decreases. With the increase of KH560 concentration, the porosity of cement-based composites decreases first and then increases, and the porosity is the smallest when the concentration is 1.5%. Both SCAs improve the surface roughness of PPF and achieve chemical bonding at PPF-SCA-matrix interface. The two kinds of SCA have little effect on the flexural strength of polypropylene fiber cement-based composites, but can effectively improve compressive strength. Overall, the modification effect of KH550 is better than KH560.

Key words: silane coupling agent, polypropylene fiber, cement-based composite, surface modification, mechanical property, microstructure

CLC Number:

TU528

SUN Jiaqi, LIU Xi, WANG Chuanlin, SU Zhiqi, LU Xin, MAI Jingmin. Performance of Silane Coupling Agent Modified Polypropylene Fiber Cement-Based Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2355-2362.

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