Effects of steel fibers and curing regime on damping property and&nbsp;mechanism of ultra-high performance concrete material

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (11) : 245-253.

CIVIL ENGINEERING

Effects of steel fibers and curing regime on damping property and mechanism of ultra-high performance concrete material

CHEN Zhaohui*1, TAO Ran1,2, WANG Yaojie1,3

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Abstract

Damping property and mechanism of ultra-high performance concrete (UHPC) were experimentally investigated considering the effects of steel fiber volume content, aspect ratio of steel fiber and curing regime. The results show that steel fibers can improve the damping property of UHPC, which is increased by 54.9% with the steel fiber volume content of 2.5% comparing with that without steel fibers. UHPC has better damping property with smaller aspect ratio of steel fibers and the employment of standard curing. With the reasonable selection of physical parameters of steel fiber and curing regime, UHPC materials with balanced damping property, mechanical strength and economic cost can be produced. A semi-empirical prediction formula for UHPC damping is established by considering the positive and negative effects of steel fibers. From microscale analysis, the addition of steel fibers into the UHPC matrix can introduce initial imperfections, including the fiber-matrix interface transition zones, micropores and microcracks, which are increased with the increasing volume content of steel fibers, the reducing aspect ratio of steel fibers and the application of standard curing. Therefore, the UHPC damping is generated by the deformation of steel fibers, friction between steel fibers and matrix, the opening and closing of microcracks, the strain around micropores, as well as the flexible cushion of air inside the micropores.

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ultra-high performance concrete (UHPC) / steel fiber / curing regime / damping property / microstructural analysis

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CHEN Zhaohui1, TAO Ran1, 2, WANG Yaojie1, 3. Effects of steel fibers and curing regime on damping property and mechanism of ultra-high performance concrete material[J]. Journal of Vibration and Shock, 2025, 44(11): 245-253

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