混凝土抗压强度对氯离子在裂缝中扩散速率的影响  

Effect of concrete compressive strength on the diffusion rate of chloride ions in cracks

作　　者：陈士龙 顾春平 杨杨[1,2] 刘金涛 倪彤元 CHEN Shilong;GU Chunping;YANG Yang;LIU Jintao;NI Tongyuan(College of Civil Engineering&Architecture,Zhejiang University of Technology,Hangzhou 310023,China;Key Laboratory of Civil Engineering Structures&Disaster Prevention and Mitigation Technologyof Zhejiang Province,Hangzhou 310023,China)

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310023 [2]浙江省工程结构与防灾减灾技术研究重点实验室,浙江杭州310023

出　　处：《混凝土》2021年第4期16-19,24,共5页Concrete

基　　金：国家自然科学基金(51708502)。

摘　　要：通过氯离子稳态扩散试验,研究了混凝土强度(C30、C50、C80)、裂缝宽度(50~600μm)对氯离子在裂缝中扩散速率的影响。结果表明,氯离子在C30裂缝中扩散速率远小于在C50和C80裂缝中,其原因是由于C30中裂缝的曲折程度大于C50和C80;随着裂缝宽度的增大,混凝土裂缝中的氯离子扩散系数快速增大,但是当裂缝宽度大于150μm后,氯离子在裂缝中的扩散系数基本保持不变。The effects of concrete strength(C30,C50,and C80)and crack width(50~600 μm)on the diffusion behavior of chloride ions in cracks were studied with chloride steady-state diffusion tests.The results showed that the diffusion rate of chloride ions in C30 cracks was much lower than that in C50 and C80 cracks.The reason was that the tortuosity of cracks in C30 was higher than that in C50 and C80 cracks.As the crack width increases,the chloride diffusion coefficient increases rapidly,but when the crack width is bigger than 150 μm,the diffusion coefficient of chloride ions in the crack stayed almost constant.

关 键 词：抗压强度 氯离子扩散系数 裂缝宽度 

分 类 号：TU528.07[建筑科学—建筑技术科学]