
科学技术与工程

中国技术经济学会
Experimental Study on the Residual Mechanical Properties of Steel-PVA Hybrid Fiber High Performance Concrete after High Temperature
Cheng-xiang XU , Xiao-yue ZHAO , Qi-qi XU , Liang-li XIAO
Science Technology and Engineering ›› 2024, Vol. 24 ›› Issue (5) : 2015 -2025.
To investigate the effects of steel fiber, polyvinyl alcohol (PVA) fiber and slag powder on the residual mechanical properties of steel-PVA hybrid fiber high performance concrete (HFHPC) after high temperature, three levels of steel fiber, PVA fiber and slag powder were selected, and the orthogonal design of L9(33) scheme was adopted to test the cube compressive strength, splitting tensile strength and flexural strength of HFHPC subjected to high temperature, and extreme difference and ANOVA were performed. The results show that the steel fiber volume fraction of 2.0% could effectively improve all the strengths of HFHPC. The PVA fiber could inhibit the concrete bursting, and the mixing with steel fiber could reflect the complementary advantages. At 800 ℃, when the volume fraction of steel fiber is 2.0%, the volume fraction of PVA fiber is 0.3%, and the blending amount of slag powder is 10%, the residual rate of compressive strength and the residual rate of splitting tensile strength of HFHPC reach the highest, 60.23% and 74.5% respectively. The compressive strength of HFHPC can be significantly increased when the slag powder dosing is more than 10%, while the splitting tensile strength and flexural strength are slightly decreased. Finally, the prediction models of compressive strength, splitting tensile strength and flexural strength of HFHPC cubes were established respectively.
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