Sorption Hysteresis of Hardened Cement Pastes
Sorption Hysteresis of Hardened Cement Pastes
复制标题
硬化水泥浆体的吸附滞后
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
H. Mögel
中科院分区：
文献类型：
--
作者：
P. Schiller;M. Wahab;T. Bier;S. Waida;H. Mögel
多孔固体中的中孔可以在孔中冷凝的环境气体的中等和高降低蒸汽压下产生明显的吸附滞后。与其他传统多孔材料不同，水泥浆体通常表现异常。在非常低的湿度下，吸水滞后现象经常持续存在。这种滞后反映在实体骨架体积的相应滞后回线中。我们讨论了一个基于凝结物对嵌入弹性固体的窄缝孔壁施加的强压缩力的理论模型。该压缩力被证明能够移动窄缝孔的壁。即使在低湿度下，取决于湿度的狭缝孔的关闭和重新打开也会产生磁滞回线。
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.