Errata to “Poroelastic model for concrete exposed to freezing temperatures” [Cement and Concrete Research 38 (2008) 40–48]
Errata to “Poroelastic model for concrete exposed to freezing temperatures” [Cement and Concrete Research 38 (2008) 40–48]
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DOI：
10.1016/j.cemconres.2009.01.009
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发表时间：
2009-04
影响因子：
11.4
通讯作者：
O. Coussy;P. Monteiro
中科院分区：
文献类型：
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作者：
O. Coussy;P. Monteiro
有许多相互竞争的理论来模拟暴露在冰冻温度下的混凝土，但很少有理论提供全面的力学行为定量预测，同时考虑到冰的受限结晶的多尺度物理。当孔隙中的一部分液体凝固时，就会产生压力，多余的液体从冻结处向多孔网络的其余部分排出。反过来，随着冷却程度的提高，冷冻抽吸过程将液体推向冷冻部位。非饱和孔隙弹性理论为这种复杂机制下的应力应变计算提供了新的视角。该公式包括冻结过程中所有相的变形。特别注意夹带的空隙对多孔材料抗冻性的影响。分析表明，空腔既是膨胀储层，又是高效的低温泵，两者的作用都得到了定量评价。该理论还允许估计临界间距因子。通过数值模拟研究了孔隙尺寸分布对临界间距因子和多孔材料冻结时内部压力的影响。
There are many competing theories to model concrete exposed to freezing temperatures but few of them provide comprehensive quantitative predictions of the mechanical behavior, while accounting for the multi-scale physics of the confined crystallization of ice. When a part of the liquid in the pores solidifies, a pressure build up is generated, and excess liquid is expelled from the freezing sites towards the remaining part of the porous network. In turn, with increasing cooling a cryo-suction process drives the liquid towards the frozen sites. Unsaturated poroelasticity theory provides new perspectives on the computation of stresses and strains developed in such a complex mechanism. The formulation includes the deformation of all the phases during the freezing process. Special attention is given to the influence of entrained air-voids on the frost resistance of the porous material. The analysis indicates that the air voids act both as expansion reservoirs and efficient cryo-pumps whose respective effects are quantitatively assessed. The theory also allows for the estimation of the critical spacing factor. Numerical simulations are conducted to study the effect of pore size distribution on the critical spacing factor and on the internal pressurization within the porous material as it freezes.