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 in the 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 . 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 for frost resistance. 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. Knowledge of useful practices in freezing and thawing destruction mechanisms of concrete in cement mortar can contribute to concrete durability design theories in bridge engineering.
Mechanical Analysis of Frost Heaving Damage of Closed Pore in Cement Mortar
14.08.2015
82015-01-01 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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