Experimental Study on Dynamic Tensile Properties of UHTCC Under Wet and Dry Cycle of Seawater
HE Xiaoyu1, ZHAO Xin2, CHEN Yikun3, LI Qinghua3,*
1 Zhejiang Institute of Communications Co., Ltd., Hangzhou 310006, China 2 School of Civil Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China 3 Institute of Advanced Engineering Structures, Zhejiang University, Hangzhou 310058, China
Abstract: To investigate the influence of strain rate and seawater wet-dry cycling on the dynamic tensile properties of ultra-high toughness cementitious composites (UHTCC), dynamic direct tensile tests were conducted on UHTCC specimens subjected to seawater wet-dry cycles for 0—120 days. The variations in tensile stress-strain response, tensile strength, ultimate tensile strain, and energy dissipation with strain rate and wet-dry cycling periods were analyzed. Under static loading, the ultimate tensile deformation of UHTCC progressively decreased with increasing cycle duration; at a strain rate of 10-5 s-1, the ultimate tensile strain of specimens subjected to 120 days of cycles was reduced by 39.7% compared to unexposed specimens. Meanwhile, the multiple cracking and strain-hardening characteristics exhibited significant degradation. Under dynamic loading, the deteriorating effect of seawater wet-dry cycling was further intensified:the strain capacity of corroded UHTCC decreased more severely with increasing strain rate, while the rate-dependent enhancement in tensile strength was attenuated, leading to a continuous reduction in dynamic energy dissipation with longer exposure durations. Compared with static conditions, unexposed UHTCC specimens exhibited up to a 20% reduction in tensile energy dissipation under dynamic loading, whereas specimens exposed for more than 90 days experienced reductions of up to 80%.
何晓宇, 赵昕, 陈奕琨, 李庆华. 海水干湿循环作用下UHTCC不同应变率拉伸性能试验研究[J]. 材料导报, 2026, 40(12): 24120240-9.
HE Xiaoyu, ZHAO Xin, CHEN Yikun, LI Qinghua. Experimental Study on Dynamic Tensile Properties of UHTCC Under Wet and Dry Cycle of Seawater. Materials Reports, 2026, 40(12): 24120240-9.
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2026, Vol. 40 
