硅烷偶联剂改性聚丙烯纤维水泥基复合材料的性能研究OA北大核心CSTPCD

In this paper,different types(KH550 and KH560)and different concentrations(0.5％,1.0％,1.5％and 2.0％,mass fraction)of SC A were used to modify the surface of polypropylene fiber(PPF).The bearing capacity of SC A 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 SC A 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 SC As improve the surface roughness of PPF and achieve chemical bonding at PPF-SCA-matrix interface.The two kinds of SC A 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.