Experimental Investigation On Bending Performances Of Reinforced Polyvinyl Alcohol Fibers Reinforced Cementitious Composite Beam

Civil engineering in our country, ECC is commonly known as bendable concrete. This is a new concept that use the modified organic fibers instead of coarse aggregate of conventional concrete, which makes the brittle concrete can be transformed into a super toughness materials- fiber cement-based composite materials. It has immeasurable prospect.In this paper, PVA fiber cement-based composite materials as the research object, the beam with commonly used components, combine with the existed research results at home and abroad. Mainly to complete the three parts:First, on the basis of the same mixture ratio, made different fiber volume content and reinforcement ratio of polyvinyl alcohol fiber cement-based composite materials long beam specimen to carry on the four-point bending test, it is concluded that the load deformation curve of specimen and stress process are analyzed in detail, meanwhile influence factors are analyzed. Drawn the conclusion that fiber cement base composite material and reinforced are deformed compatibility, The bottom of specimen’s cracking of reinforced with fiber cement-based composite materials have little effect in bondingSecond, in view of the contribution of fiber on the number and width of cracks, cracks developed elaborate rules are in detail, it is concluded that crack distribution characteristics, fracture form are compared between polyvinyl alcohol fiber cement matrix composites and concrete, the role of fiber crack resistance are analyzed in detail.Third, long beam flexural failure modes are researched. According to the existing theory, fiber’s role are considered, capacity calculation formula, balanced reinforcement ratio, the minimum reinforcement ratio are obtained.