Study on Toughness and Toughness Mechanism of High Toughness Fiber Concrete
Toughness is the mechanical index of comprehensive evaluation of the strength and deformation ability of cement matrix composite materials.The stronger the toughness is,the lower the possibility of brittle fracture is.A total of 9 different polypropylene fiber mixing speci-mens were prepared to evaluate the damage resistance and bending deformation under shock load by shock test and four-point bending test,and the microscopic interface was observed by SEM.The test results show that the addition of thick and thin fiber can improve the toughness of con-crete.The bending toughness of thick polypropylene fiber and thin fiber is better than single fiber,and the optimal ratio is the volume of poly-propylene thick and thin fiber is 1%.Finally,the toughening mechanism of high toughness fiber concrete is proposed by analyzing the micro-scopic interface structure and fracture morphology.
High toughness fiber concreteMixed fiberToughnessToughness mechanism
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