Study on mechanical behaviours of PAN,PVA,PP fiber cement-based composite materials
The effects of fiber type and fiber content on the flexural strength and compressive strength of cement based composites at 3 d and 28 d were compared and analyzed by using three types of fibers,namely,polyacrylonitrile(PAN)fiber,polyvinyl alcohol(PVA)fiber,and polypropylene(PP)fiber.The distribution of fibers in cement based composites was observed using scanning electron microscopy,and the mechanism of action was discussed.The results showed that the best effect on the 28 d flexural strength of cement based composites was obtained by adding PAN fiber alone;PVA fiber alone has the greatest effect on improving the 28 d compressive strength of cement based composites;PP fiber alone has a significant effect on the 3 d flexural strength and compressive strength of cement based composites.When the content of PAN fiber is 0.8％and the content of PVA fiber is 0.2％,the 28 d flexural strength of the cement based composite material is the highest,reaching 9.728 MPa;When the content of PVA fiber is 0.8％and the content of PAN fiber is 0.2％,the compressive strength of the cement based composite material at 28 days is the highest,reaching 41.92 MPa.
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