Sorption Hysteresis of Hardened Cement Pastes
Sorption Hysteresis of Hardened Cement Pastes作者机构：Inst. Phys. Chem. TU-Bergakademie Freiberg Freiberg Germany IKGB TU-Bergakademie Freiberg Freiberg Germany
出 版 物：《Journal of Materials Science and Chemical Engineering》 (材料科学与化学工程（英文）)
年 卷 期：2016年第4卷第2期
页 面：40-48页
学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学]
主 题：Porous Solids Sorption Hysteresis Capillary Forces Cement-Based Materials
摘 要：Mesopores in porous solids can produce a pronounced sorption hysteresis at moderate and high reduced vapor pressures of the ambient gas that is condensed in the pores. Unlike to other conventional porous materials, cement pastes often behave exceptionally. The water sorption hysteresis frequently persists at very low humidity. This hysteresis is reflected in a corresponding hysteresis loop of the solid skeleton volume. We discuss a theoretical model based on the strong compression force exerted by a condensate on the walls of narrow slit pores embedded in an elastic solid. This compression force is shown to be capable of shifting walls of narrow slit pores. Humidity-dependent closing and reopening of slit pores can produce hysteresis loops even at low humidity.
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