Modeling of the Compressive Strength of Basalt Fiber Concrete Based on Pore Structure Under Single-side Freeze-Thaw Condition
ZHAO Yanru1, LIU Fangfang1, WANG Lei1, GUO Zilin2
1 School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051, China 2 Shandong Tongyuan Design Group Co. Ltd,Jinan 250000, China
Abstract: In this paper, the effects of different basalt fiber content and freeze-thaw times on the frost resistance and pore structure of concrete were stu-died through the single-side freeze-thaw cycle test. Grey entropy method was used to analyze the influence of pore structure parameters on the compressive strength of concrete after freeze-thaw cycles.The contribution rate formula of basalt fiber under different freeze-thaw cycles was obtained by fitting. The compressive strength model was established based on multiple factors such as pore specific surface area, pore volume and basalt fiber contribution rate. The results showed that the compressive strength of the different fiber contents specimens decreased with the increase of freeze-thaw cycles, the air content, average pore chord length and pore spacing coefficient of specimens increased with the increase of freeze-thaw cycles, and the specific surface area of pores decreased with the increase of freeze-thaw cycles. In this test, the frost resistance of concrete is optimal when the fiber content is 0.2vol%. According to the grey entropy analysis, the correlation degree of compressive strength with the pore specific surface area and pore diameter of less than 100 μm is the highest.The regression effect of the compressive strength and the specific surface area of pores, pore volume and the contribution rate of basalt fiber is significant, which can predict the quantitative relationship between the compressive strength of basalt fiber concrete and the pore structure after the single-side freeze-thaw cycle test, and evaluate the durability of basalt fiber concrete in cold areas.
赵燕茹, 刘芳芳, 王磊, 郭子麟. 单面盐冻条件下基于孔结构的玄武岩纤维混凝土抗压强度模型[J]. 材料导报, 2020, 34(12): 12064-12069.
ZHAO Yanru, LIU Fangfang, WANG Lei, GUO Zilin. Modeling of the Compressive Strength of Basalt Fiber Concrete Based on Pore Structure Under Single-side Freeze-Thaw Condition. Materials Reports, 2020, 34(12): 12064-12069.
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2020, Vol. 34 
