1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China;
2. School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou Gansu 730050, China
Mechanical Analysis of Frost Heaving Damage of Closed Pore in Cement Mortar
LI Sheng1, WANG Qi-cai1, MA Li2, YU Ben-tian1, DENG Xiao1
1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China;
2. School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou Gansu 730050, China
摘要Based on the thermodynamic equilibrium principle and elastic mechanics theory, the mechanical calculation of borehole wall stress under ice-formation pressure effect is carried out for the water saturation condition of cement mortar closed pore. The pore configuration cement mortar can be approximated as spherical or cylindrical. A micro-mechanics calculation model is established. The borehole wall inner and outer surface tensile stress is deduced in different pores under the ice-formation pressure effect. For the cement mortar component, the borehole wall stress of spherical and cylindrical pores is calculated at -20℃. Results show that the spherical pore is more constant than the cylindrical pore under the same ice-formation pressure effect. The borehole wall tensile stress of the spherical pore is much smaller than that of the cylindrical one, which is advantageous in frost resistant. Finally, according to the theoretic calculation method, the pore configuration, radius, borehole thickness and freezing temperature are the main factors in borehole wall tensile stress, as shown by the parameter analysis. Trying to useful practice in freezing and thawing destruction mechanisms of concrete in cement mortar, it can contribute to concrete durability design theories in bridge engineering.
Abstract：Based on the thermodynamic equilibrium principle and elastic mechanics theory, the mechanical calculation of borehole wall stress under ice-formation pressure effect is carried out for the water saturation condition of cement mortar closed pore. The pore configuration cement mortar can be approximated as spherical or cylindrical. A micro-mechanics calculation model is established. The borehole wall inner and outer surface tensile stress is deduced in different pores under the ice-formation pressure effect. For the cement mortar component, the borehole wall stress of spherical and cylindrical pores is calculated at -20℃. Results show that the spherical pore is more constant than the cylindrical pore under the same ice-formation pressure effect. The borehole wall tensile stress of the spherical pore is much smaller than that of the cylindrical one, which is advantageous in frost resistant. Finally, according to the theoretic calculation method, the pore configuration, radius, borehole thickness and freezing temperature are the main factors in borehole wall tensile stress, as shown by the parameter analysis. Trying to useful practice in freezing and thawing destruction mechanisms of concrete in cement mortar, it can contribute to concrete durability design theories in bridge engineering.
基金资助:Supported by the National Natural Science Foundation of China (No.51268032); the Program for Changjiang Scholars and Innovative Research Team in University of China (No.IRT1139)
通讯作者:
LI Sheng, E-mail:ligwin@126.com
E-mail: ligwin@126.com
引用本文:
李盛, 王起才, 马莉, 于本田, 邓晓. 水泥砂浆封闭孔隙冻胀破坏问题的力学分析[J]. Journal of Highway and Transportation Research and Development, 2015, 9(3): 55-62.
LI Sheng, WANG Qi-cai, MA Li, YU Ben-tian, DENG Xiao. Mechanical Analysis of Frost Heaving Damage of Closed Pore in Cement Mortar. Journal of Highway and Transportation Research and Development, 2015, 9(3): 55-62.
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2015, Vol. 9 
