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首页> 外文期刊>Cement and Concrete Research >Modelling and simulations of the chemo-mechanical behaviour of leached cement-based materials Leaching process and induced loss of stiffness
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Modelling and simulations of the chemo-mechanical behaviour of leached cement-based materials Leaching process and induced loss of stiffness

机译：沥滤水泥基材料化学力学行为的建模与模拟

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The present paper aims at modelling the decalcification process in cement-based materials and its impact on the material stiffness, which represents a serious matter in terms of long-term durability. The resistance of cementitious materials to this chemical alteration is strongly conditioned by their mineral composition and porosity. For this purpose, a multi-scale homogenization approach (Stora et al., Trans. For. Med. 73,3,2008) is implemented in the numerical platform ALLIANCES (P. Montarnal, C. Miigler, J. Colin, M. Descotes, A. Dimier, E. Jacquot, Presentation and use of a reactive transport code in porous media, Phys. Chem. Earth 32,2007) to estimate from these data the elastic and diffusive properties of cement-based materials. The association of this homogenization model and of the integration platform, which can couple different numerical codes, then allows for evaluating the evolution of the mineral composition and of the diffusive and mechanical properties of a concrete material during chemical deterioration processes. Simulations of pure water leaching of hydrated cement pastes are performed and the consequences of this decalcification on the material's residual elastic behaviour are estimated. The numerical results are confronted with available experimental data and analyzed. The simulations of the non-linear mechanical behaviour of leached cementitious materials taking into account interactions between damage and leaching is not reported here for conciseness but can be found in another document (Stora, Modelling and simulations of the chemo-mechanical behaviour of leached cement-based materials. PhD Dissertation, univ. of Paris-Est 2008).
机译：本文旨在对水泥基材料中的脱钙过程及其对材料刚度的影响进行建模，这对于长期耐用性而言是一个严重的问题。胶结材料对这种化学变化的抵抗力受其矿物成分和孔隙率的强烈影响。为此，在数值平台ALLIANCES（P. Montarnal，C. Miigler，J. Colin，M.）中实施了多尺度均质化方法（Stora等，Trans。For。Med。73,3,2008）。 Descotes，A。Dimier，E。Jacquot，在多孔介质中的反应性运输代码的呈现和使用，Phys。Chem。Earth 32，2007），以从这些数据中估算水泥基材料的弹性和扩散特性。该均质化模型和集成平台的关联可以耦合不同的数字代码，然后可以评估矿物成分的演变以及化学劣化过程中混凝土材料的扩散和机械性能。对水合水泥浆的纯水浸出进行了模拟，并估算了这种脱钙对材料残余弹性行为的影响。数值结果与可用的实验数据相面对并进行了分析。为简洁起见，此处未报告考虑到破坏与浸出之间相互作用的浸出胶结材料非线性机械性能的模拟，但可以在另一篇文档中找到（Stora，浸出胶结材料化学力学行为的建模和模拟，基础材料（博士学位论文，巴黎，巴黎，2008年）。

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