Yang Quan-Bing, Zhang Shu-Qing
Research Lab of Materials Engineering, College of Materials Science and Engineering, Tongji University, Shanghai 200433, China.
J Zhejiang Univ Sci. 2004 Dec;5(12):1517-23. doi: 10.1631/jzus.2004.1517.
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 (T(r)/T(te) ratio).
关于水灰比和硅灰对高性能混凝土（HPC）自生收缩及内部相对湿度的影响的研究，以及对高性能混凝土自干燥机理的分析表明，高性能混凝土的自生收缩随水灰比的降低而增大，内部相对湿度则随水灰比的降低而减小；并且这些现象因硅灰的加入而加剧。理论分析表明，高性能混凝土中相对湿度的降低并非由于缺水，而是由于高性能混凝土中可蒸发水不能自由蒸发。高性能混凝土内部相对湿度的降低或所谓的自干燥主要是由高性能混凝土中可溶性离子摩尔浓度的增加以及孔径的减小或微孔水在总可蒸发水中所占比例（T(r)/T(te) 比值）的增加引起的。
