Relative Humidity Evolution of High Performance Concrete Caused by Self-desiccation and Moisture diffusion

被引：0
|
作者：
Chang H. [1 ]
Jin Z. [2 ]
Liu J. [1 ]
机构：
[1] School of Qilu Transportation, Jinan
[2] School of Civil Engineering, Qingdao University of Technology, Qingdao
来源：
Cailiao Daobao/Materials Reports | 2019年 / 33卷 / 07期
基金：
中国国家自然科学基金;
关键词：
High performance concrete; Humidity; Moisture diffusion; Self-desiccation;
D O I：
10.11896/cldb.18060063
中图分类号：
学科分类号：
摘要：
In order to explore the influence of self-desiccation and moisture diffusion on the internal humidity evolution of high performance concrete, specimens were subjected to self-desiccation condition and constant temperature and humidity condition. Then the evolution law of humidity under above conditions was systematically investigated. The results show that the internal humidity decrement caused by self-desiccation mainly occurs within the age of 28 d while that triggered by moisture distribution mainly occurs within the age of 14 d. Besides, the adding of fly ash decreases humidity decrement significantly either induced by self-desiccation or moisture diffusion and makes the matrix stay in the moisture saturation phase for at least 8 d. However, the mixture of ground granulated blast furnace slag accelerates internal humidity decrement. Moreover, the evolution of internal humidity is dominated by self-desiccation in the early stage, and when the dosage of fly ash was 50%, moisture diffusion takes the lead. Furthermore, with increase of water to binder ratio or the decrease of depth, the percentage of self-desiccation influence on humidity decrement descends gradually accompanied by the increasing proportion of moisture diffusion influence. © 2019, Materials Review Magazine. All right reserved.
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页码：2370 / 2375
页数：5
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