Study on the Setting Hardening and Mechanical Properties of Polyacrylonitrile Fiber Regulated Cement-based Filling Materials
The setting and hardening time,compressive strength,bond strength,bending strength and tensile strength of cement-based filling materials were analyzed by using polyacrylonitrile(PAN)fiber.The effects of different fiber content(0.5％,1.0％,1.5％)and length to diameter ratio(100,200,300)on the mechanical properties of polyacrylonitrile fibers were studied.The results showed that when the content of PAN fiber was 1.5％,the initial coagulation time and the final coagu-lation time in CM group were reduced by 11.1％and 5.7％,respectively.The compressive strength of PAN fiber cement-based filling material decreases with the increase of PAN fiber content.Compared with CM group(PAN fiber is not blended),when the volume content of PAN fiber was 0.5％,1％and 1.5％,the compressive strength decreased by 13.0％,3.7％and 7.4％,respectively.The bending strength of cement-based filling material with fiber content of 1％and length-diameter ratio of 200 in-creased by 78.6％compared with CM group,and the grouth rate was the largest.The bonding strength and bending strength of cement-based filling materials increase first,and then decrease with the increase of PAN volume and length-diameter ratio.With the addition of PAN fiber,the tensile strength of cement-based filling material is improved,and the tensile strength of PAN fiber cement-based filling material is increased by 36.4％～418.2％compared with CM group.
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