文献类型：期刊文献

中文题名：时间与拉应力耦合作用对混凝土中氯离子扩散影响

英文题名：Influence of coupled effects of time and tensile stress on chloride diffusion in concrete

作者：钱金权[1];钱晓倩[2];张聪燕[1]

机构：[1]绍兴文理学院元培学院建筑工程分院,浙江绍兴312000;[2]浙江大学建筑工程学院,浙江杭州310058

年份：2022

期号：4

起止页码：28

中文期刊名：混凝土

外文期刊名：Concrete

收录：CSTPCD、、北大核心、北大核心2020

基金：国家自然科学基金项目(51809233);浙江省重点研发计划项目(2017C01052)。

语种：中文

中文关键词：混凝土;氯离子扩散;表观氯离子扩散系数;表面氯离子浓度;时间依赖性;应力依赖性

外文关键词：concrete;chloride diffusion;apparent chloride diffusion coefficient;surface chloride concentration;time-dependent;stress-dependent

中文摘要：通过224 d氯离子浸泡试验,研究了氯离子侵蚀时间与混凝土拉应力耦合作用对氯离子扩散的影响。首先,通过试验数据确定了不同拉应力水平与不同氯离子侵蚀时间下的表观氯离子扩散系数及表面氯离子浓度;然后,建立了考虑拉应力水平与氯离子侵蚀时间耦合作用影响的表面氯离子浓度计算模型与表观氯离子扩散系数计算模型。研究结果表明,表面氯离子浓度与时间之间的关系近似符合平方根函数模型;表面氯离子浓度与表观氯离子扩散系数均具有时间和应力依赖性,均可以表示为拉应力水平与氯离子侵蚀时间的二元函数;经验系数具有应力依赖性,可以表示成拉应力水平的三次函数;相同拉应力水平下,表观氯离子扩散系数随着氯离子侵蚀时间的增加而减小,而表面氯离子浓度随着氯离子侵蚀时间的增加而增大;相同氯离子侵蚀时间下,表观氯离子扩散系数与表面氯离子浓度均随着拉应力水平的增加而增大。

外文摘要：The influence of coupled effects of exposure time and concrete tensile stress on chloride diffusion is investigated on the basis of chloride immersion test up to 224 days.Firstly,the apparent chloride diffusion coefficient and surface chloride concentration under different tensile stress levels and different exposure time are determined based on the experimental data.Then,the surface chloride concentration calculation model and apparent chloride diffusion coefficient calculation model considering the influence of coupled effects of tensile stress level and exposure time are established,respectively.The results show that the relationship between the surface chloride concentration and exposure time approximately conforms to the square root function model.Both surface chloride concentration and apparent chloride diffusion coefficient are time and stress-dependent,and both can be expressed as a binary function of tensile stress level and exposure time.The empirical coefficient is stress-dependent and can be expressed as a cubic function of tensile stress level.Under the same tensile stress level,the apparent chloride diffusion coefficient decreases with the increase of exposure time,while the surface chloride concentration increases with the increase of exposure time.Under the same exposure time,both apparent chloride diffusion coefficient and surface chloride concentration increase with the increase of tensile stress level.