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- Title
Microstructure-Based Relative Humidity in Cementitious System Due to Self-Desiccation.
- Authors
Zhang, Yong; Ouyang, Xiaowei; Yang, Zhengxian
- Abstract
The internal relative humidity (RH) plays a crucial role in most of the concrete properties. Self-desiccation caused by continuous cement hydration is a major factor affecting the RH of concrete. This paper investigates the relationship between RH and microstructure for cementitious systems in the case of self-desiccation. A series of paste specimens prepared with different binder and water-binder-ratio (w/b) were cured under sealed conditions from 1 day to 1.5 years. The RH and microstructure of the paste specimens were measured. The microstructure characteristics under study include porosity, pore size, evaporable and non-evaporable water content. The results reveal that the RH of cementitious system drops to a great extent in the first 105 days' hydration and decreases slowly afterwards. The blended materials such as fly ash, slag or limestone powder have different influences on the RH. A mathematical model between RH and the average pore diameter is proposed for cementitious systems under self-desiccation, regardless of age, w/b or cement type.
- Subjects
CEMENT composites; HUMIDITY; EFFECT of temperature on cement; MICROSTRUCTURE; HYDRATION
- Publication
Materials (1996-1944), 2019, Vol 12, Issue 8, p1214
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma12081214