Experimental Studies on Mechanical Properties of Concrete under Freeze-thaw Action

摘要

The influence caused by freeze-thaw action on mechanical properties of concrete, such as on compressive stress-strain relationship and cleavage and bonding performance, is studied. Moreover, according to bearing state of column members in actual engineering, we also investigate the degradation of material and mechanical properties of concrete suffered from dual factors of compressive stress and freeze-thaw cycles. The research results disclosure that structural mechanical properties and synchronous service capacity with reinforcement bars and concrete are degraded at the same time when material performances of concrete are damaged. From the experimental results, conclusions have been drawn that if bearing state of structure is considered, the deterioration caused by freeze-thaw action is aggravated, and the descending tendency is more significant than that singly under freeze-thaw action. This paper refers some valuable information to consummate durability design theory for concrete structures which serve in freeze-thaw environment.