Abstract
In order to improve the reuse efficiency of construction waste, industrial waste and textile waste, this study mixed the waste polypropylene fiber with polyacrylonitrile fiber in a certain proportion, and studied the influence of different blending ratio of hybrid fiber on crack resistance of recycled concrete beams. The experimental results showed that the mixing of hybrid fibers not only improves the basic mechanical properties and strength of recycled concrete test blocks, but also effectively inhibits the generation and development of cracks, and improves the crack resistance of recycled concrete beams. The article proposes the formula of maximum crack width in the limit state of normal use of hybrid fiber recycled concrete beams by theoretical analysis.
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