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Effects of desiccation on mechanical behaviour of concreteEffects of desiccation on mechanical behaviour of concrete

机译：干燥对混凝土力学性能的影响干燥对混凝土力学性能的影响

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摘要

The objective of this work is experimental characterisation and numerical modelling of coupled behaviours between drying shrinkage and plastic damage in concrete. In the first part, we present an original experimental study on an ordinary concrete in order to determine material damage induced by drying shrinkage. Uniaxial compression tests are performed on samples dried for different periods. It is shown that material damage can be caused by drying process. Mechanical behaviour becomes more brittle with higher damage kinetics when concrete is dried. In the second part, a constitutive model is proposed in order to describe coupled hydro-mechanical behaviour of partially saturated concrete. This model takes into account induced damage, mechanical and capillary plastic deformations. Numerical simulations of experimental tests are presented, and show a qualitatively good agreement with experimental data. The results are relevant with respect to the importance of drying process in the durability study of concrete structures.
机译：这项工作的目的是对混凝土的干缩和塑性损伤之间的耦合行为进行实验表征和数值模拟。在第一部分中，我们提出了对普通混凝土的原始实验研究，以确定由干缩引起的材料损伤。对经过不同时间干燥的样品进行单轴压缩测试。结果表明，干燥过程可能导致材料损坏。当混凝土干燥时，机械性能变得更脆，破坏动力学更高。在第二部分中，提出了本构模型以描述部分饱和混凝土的水力耦合特性。该模型考虑了诱发损伤，机械和毛细管塑性变形。给出了实验测试的数值模拟，并且在质量上与实验数据吻合。该结果与干燥过程在混凝土结构耐久性研究中的重要性有关。

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