Experimental Study on Properties of Recycled Tyre Polymer Fiber Reinforced Concrete

doi:10.12068/j.issn.1005-3026.2020.06.019

Abstract

Abstract: To study the effect of recycled rubber tyre polymer fiber (RTPF) on the working performance and mechanical properties of concrete， tests on the properties of the mixtures， the basic mechanical properties and the mechanism of the fiber performances were conducted on the plain concrete (F0)， RTPF concrete and polypropylene fiber (PPF) concrete. The results showed that the air content increases with the increasing of the RTPF fraction， and the air entraining capacity of PPF is better than that of the RTPF with the same volume fraction (0.1%). The slump decreases with the increasing of the RTPF fraction， and the slump of the PPF concrete is lower than that of the RTPF concrete under the same volume fraction (0.1%); the compressive strength of concrete decreases with the increasing of the RTPF fraction. Both the splitting tensile strength and the flexural strength of the RTPF concrete increase at the initially stage and then decrease; 0.2% is determined as the optimal volume fraction. The SEM showed that the RTPF was pulled out from the matrix or broken by tension， which indicates that the RTPF can effectively provide bridging effect. This study showed that the RTPF can improve the mechanical properties of concrete and can replace the PPF effectively within a certain range of the fiber fraction.

Key words: fiber reinforced concrete, recycled tyre polymer fiber(RTPF), polypropylene fiber, working performance, mechanical properties

CLC Number:

TU528.572

CHEN Meng， LIU Yang-bo， TAO Yun-xiao， WANG Hao. Experimental Study on Properties of Recycled Tyre Polymer Fiber Reinforced Concrete[J]. Journal of Northeastern University Natural Science, 2020, 41(6): 870-874.

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