Stable Exposure Duration of Field Test of Concrete and Its Analytical Technique
YANG Lufeng1,2,†,*, LONG Fengbo1,3,†, SUN Jiwei1,2, CHEN Junwu2,4
1 School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2 Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China 3 China West Construction Academy of Building Materials Co., Ltd., Chengdu 610218, China 4 Hualan Design Co., Ltd., Nanning 530011, China
Abstract: The field test of concrete is usually used to study the chloride diffusion coefficient of concrete, which requires an appropriate analytical technique and the stable exposure duration. To this end, the instantaneous diffusion theory and the average one were studied systematically, while parameters in the diffusion equation were specified with different time dependent property. It was proven that the analytical solution of instantaneous diffusion equation for diffusion process and concentration distribution of chloride ion in concrete was equivalent to that of average one. Then, the random number was employed to introduced sampling error in exposure test of concrete, while the Monte Carlo simulation was adopted to analyze the influence of exposure duration, sampling error and regression technique on the results of chloride diffusion coefficient of concrete under chloride environment. It was revealed that the results from the instantaneous diffusion solution was easily affected by the initial value of parameter in iteration when it was used for regression analysis of field test data of concrete, leading to instability of initial diffusion coefficient. Ho-wever, the average diffusion solution is more stable for regression analysis of chloride diffusion coefficient by using field test data of concrete exposed to chloride. Furthermore, the stable exposure duration was determined for concrete field test with different values under different sampling errors. Finally, the proposed technique of regression analysis and the stable exposure duration was validated as essential tools for treatment of field test data of concrete in chloride environment in two examples from engineering practice.
杨绿峰, 龙凤波, 孙继玮, 陈俊武. 混凝土暴露试验的稳定时长与试验分析方法[J]. 材料导报, 2024, 38(2): 22020091-7.
YANG Lufeng, LONG Fengbo, SUN Jiwei, CHEN Junwu. Stable Exposure Duration of Field Test of Concrete and Its Analytical Technique. Materials Reports, 2024, 38(2): 22020091-7.
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2024, Vol. 38 
