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Received: 2003-07-09

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Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.12 P.1517-1523


Self-desiccation mechanism of high-performance concrete

Author(s):  YANG Quan-bing, ZHANG Shu-qing

Affiliation(s):  Research Lab of Materials Engineering, College of Materials Science and Engineering, Tongji University, Shanghai 200433, China

Corresponding email(s):   qbyang@mail.tongji.edu.cn

Key Words:  High-performance concrete, Autogenous shrinkage, Self-desiccation, Relative humidity

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YANG Quan-bing, ZHANG Shu-qing. Self-desiccation mechanism of high-performance concrete[J]. Journal of Zhejiang University Science A, 2004, 5(12): 1517-1523.

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Investigations on the effects of W/C ratio and silica fume on the autogenous shrinkage and internal relative humidity of high performance concrete (HPC), and analysis of the self-desiccation mechanisms of HPC showed that the autogenous shrinkage and internal relative humidity of HPC increases and decreases with the reduction of W/C respectively; and that these phenomena were amplified by the addition of silica fume. Theoretical analyses indicated that the reduction of RH in HPC was not due to shortage of water, but due to the fact that the evaporable water in HPC was not evaporated freely. The reduction of internal relative humidity or the so-called self-desiccation of HPC was chiefly caused by the increase in mole concentration of soluble ions in HPC and the reduction of pore size or the increase in the fraction of micro-pore water in the total evaporable water (Tr/Tte ratio).

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