Abstract Considering the triaxial behavior of concrete is highly related to its hydration process with curing temperature and time, the triaxial mechanical behavior of early age concrete under different curing conditions is investigated. Uniaxial/triaxial compression tests of a C30 concrete cured at representative temperature and time are performed while its pore characteristic is determined. Based on experimental analysis, a curing factor indicative of the effect of curing conditions is proposed and discussed by empirical functions. It is found that the uniaxial/triaxial failure strength and elastic modulus increase with curing factor, but the deformation decreases slightly. The pore structures evolve with curing factor. Furthermore, the influence of curing factor on the strength decreases with the confining pressure. Finally, a hydration dependent modelling is proposed by introducing curing factor. Numerical simulations show that the proposed modelling can well predict the triaxial mechanical behavior of early age concrete under different curing conditions.

中文翻译：

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早期混凝土的三轴力学行为：试验与建模研究

摘要 考虑到混凝土的三轴行为与养护温度和时间的水化过程密切相关，研究了不同养护条件下早期混凝土的三轴力学行为。在确定其孔隙特性的同时，对在代表性温度和时间固化的 C30 混凝土进行单轴/三轴压缩试验。在实验分析的基础上，通过经验函数提出并讨论了指示固化条件影响的固化因子。发现单轴/三轴破坏强度和弹性模量随着固化因子的增加而增加，但变形量略有减少。孔隙结构随固化因子而变化。此外，固化因子对强度的影响随着围压的增加而减小。最后，通过引入固化因子，提出了依赖于水化的建模。数值模拟表明，所提出的模型可以很好地预测不同养护条件下早期混凝土的三轴力学行为。