期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 47, 期 -, 页码 66-79出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.04.024
关键词
Chloride ions; Crack; Cracked concrete; Moisture influential depth; Artificial environments
资金
- High Technology Research and Development Program (863 Program)
- National Natural Science Foundation [50838008, 51178413]
Although Fick's second law is always applied to predict chloride profiles in concrete due to its simple mathematical expression, it takes no consideration of cracking affects. However, concrete structures are not always crack-free, therefore clarifying the internal environment and relevant chloride diffusivity in cracked concrete is essential to predict chloride ingress since cracking always has a negative impact on concrete durability. In present work, series of experimental investigations on two coefficients (i.e., chloride diffusion coefficients and moisture influential depth) affecting chloride profiles at cracked concrete were carried out. For the investigation of chloride diffusivity, Electron Probe Micro Analysis (EPMA) was used to extract the accurate chloride concentration via area scanning, line scanning, and point scanning. In addition, specimens with two different types of mix (i.e., ordinary concrete and blast furnace slag concrete) and with two different exposed times (i.e., 30 days and 60 days) were tested for different surface crack patterns. Crack width investigated in present work ranges from 0.05 mm to 0.20 mm. Furthermore, the effective chloride diffusion coefficient for cracked concrete was calculated under the law of flux conservation by taking consideration of both crack patterns and concrete mixtures. On the other hand, for the investigation of moisture influential depth, a series of laboratory experiments with different cracking specimens were conducted to clarify the influence of external artificial weather on the relative humidity distribution in concrete crack, including periodic changing of external relative humidity and temperature, fog and rainfall simulation environments, the drying phase after precipitation. (C) 2013 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据