Zhou Tingtao, Ioannidou Katerina, Masoero Enrico, Mirzadeh Mohammad, Pellenq Roland J-M, Bazant Martin Z
School of Engineering , Newcastle University , Newcastle upon Tyne NE1 7RU , U.K.
Langmuir. 2019 Mar 26;35(12):4397-4402. doi: 10.1021/acs.langmuir.8b03400. Epub 2019 Mar 13.
A numerical and theoretical framework to address the poromechanical effect of capillary stress in complex mesoporous materials is proposed and exemplified for water sorption in cement. We first predict the capillary condensation/evaporation isotherm using lattice-gas simulations in a realistic nanogranular cement model. A phase-field model to calculate moisture-induced capillary stress is then introduced and applied to cement at different water contents. We show that capillary stress is an effective mechanism for eigenstress relaxation in granular heterogeneous porous media, which contributes to the durability of cement.
提出了一个数值和理论框架，用于解决复杂介孔材料中毛细应力的孔隙力学效应，并以水泥中的水吸附为例进行了说明。我们首先在一个实际的纳米颗粒水泥模型中使用晶格气体模拟预测毛细凝聚/蒸发等温线。然后引入一个相场模型来计算水分诱导的毛细应力，并将其应用于不同含水量的水泥。我们表明，毛细应力是颗粒状非均质多孔介质中本征应力松弛的有效机制，这有助于提高水泥的耐久性。
