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首页> 外文会议>International Biennial Conference on Ultrafine Grained and Nanostructured Materials >Capillary Forces and Sorption Hysteresis of Cement Pastes with Small Slit Pores
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Capillary Forces and Sorption Hysteresis of Cement Pastes with Small Slit Pores

机译：小狭缝孔隙毛细管的毛细管力和吸附滞后

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摘要

Cement-based materials often display an extraordinarily pronounced hysteresis of water sorption isotherms, even at low vapor pressures. This hysteresis is reflected in the volume change of the solid skeleton. To explain these observations, we propose a simple mechanism based on strong capillary forces in slit pores. Condensed water can exert capillary forces that change the volume of pores which are embedded in elastic solids. A macroscopic model predicts a pronounced sorption hysteresis for soft materials with narrow slit-shaped pores. The proposed mechanism can also be the origin of hysteresis in more rigid materials such as hardened cement pastes, which have a large fraction of micropores.
机译：即使在低蒸汽压力下，水泥基材料通常会显示出异味的水吸附等温线滞后。该滞后反映在固体骨架的体积变化中。为了解释这些观察，我们提出了一种基于狭缝孔隙强的毛细力的简单机制。冷凝水可以施加毛细管力，从而改变嵌入弹性固体中的孔的体积。宏观模型预测具有窄狭缝孔的软材料的发音吸附滞后。所提出的机制也可以是滞后的起源，例如更硬的材料，例如硬化的水泥浆料，其具有大量的微孔。

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