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中文摘要：
基于热力学平衡原理,利用弹性力学理论,对水饱和状态下中封闭孔隙在结冰压力作用下的孔壁应力进行了力学计算分析.把水泥砂浆中的孔隙形状近似看成是球形或圆柱形,分别建立了细观力学计算模型,并推导了不同孔隙在结冰压力作用下的孔壁内外表面拉应力,并对某一水泥砂浆构件在受冻温度为-20℃时,球形和圆柱形孔隙的孔壁应力进行了计算,结果表明,在相同结冰压作用下,由于球形孔隙较圆柱形受力更为均匀,其孔壁拉应力明显小于圆柱形孔隙,有利于抗冻.最后,依据此理论计算方法,对孔隙形状、半径、孔壁厚度、冻结温度等对孔壁应力的主要影响因素进行了参数分析,以期能够从砂浆入手对混凝土受冻破坏机理做些有益尝试.
英文摘要：
Based on the thermodynamic equilibrium principle and the elastic mechanics theory, in terms of the cement mortar closed pore under water saturation condition, the mechanical calculation of pore wall stress under the freezing pressure effect is carried out. Regarding the pore configuration in cement mortar as sphere or cylinder approximately, the meso-mechanics calculation models are established respectively. The tensile stress of inside and outside surfaces of pore wall with different pore under the freezing pressure effect is derived, and the pore wall stresses of sphere and cylinder of a cement mortar component at the freezing temperature of -20℃ are calculated. The result shows that due to the stress of the sphere pore is more uniform than that of the cylindrical pore under the same freezing pressure effect, the hole wall tensile stress is much smaller than that of the cylindrical one, it is advantageous to the frost resistant. Finally, according to the theoretic calculation method, parameter analysis are performed to study the main influencing factors on pore wall stress such as pore configuration, radius, borehole thickness and freezing temperature for analysing the cold failure mechanism of concrete from cement mortar.
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