Influence of exposure temperature on chloride diffusion in concrete
Author:
Affiliation:
Fund Project:
摘要
|
图/表
|
访问统计
|
参考文献
|
相似文献
|
引证文献
|
资源附件
|
文章评论
摘要:
混凝土中氯离子侵蚀过程与外部环境条件、混凝土自身性能等因素密切相关。通过开展2～40 ℃ 5个不同环境温度和28、56及90 d 3个养护龄期的室内盐水浸泡试验，研究环境温度和养护龄期对普通混凝土和高性能混凝土氯离子侵蚀规律的影响。结果表明：环境温度影响混凝土中氯离子的扩散速度，随着环境温度的升高，混凝土中氯离子扩散系数增大，并且环境温度对氯离子扩散速度的影响程度及混凝土活化能Ea与混凝土性能、养护龄期相关；在对南北不同地区混凝土耐久性设计和施工时，应充分考虑混凝土材料的差异性及养护时间对活化能Ea取值的影响。
Abstract:
Chloride diffusion process on concrete is closely related to the factors such as environment condition and performance of concrete.This paper examines the effect of five exposure temperatures from 2 ℃ to 40 ℃ and curing age of 28，56 and 90 days on chloride diffusion in ordinary concrete and high-performance concrete.The result indicates that chloride diffusion on concrete increases with the exposure temperature.The degree of influence and activation energy Ea for the exposure temperature is related to the concrete performance and curing age.For the design and construction of concrete structure’s durability under different environmental regions，we should give full consideration to differences of concrete material and curing time on the values of activation energy Ea.
