FRACTURE TOUGHNESS AND FRATURE ENERGY OF CONCRETE SUBJECTED TO FREEZE-THAW CYCLES

摘要：

According to GBJ82-85 test method for frost resistance of concrete, four-point bendingtests were used to examine the effects of water-cement ratio and air-entraining agent onfracture toughness, fracture energy and dynamic elastic modulus of concrete subjected to 300rapid freeze-thaw cycles. The microstructure of the concrete was also analyzed. The resultsshow that with the increase of the number of freeze-thaw cycles, the fracture toughness ofconcrete, and the loss of fracture energy as well as the loss of relative dynamic elasticmodulus showed a downward trend. The higher water-cement ratio, the severer the damage ofconcrete as the number of freeze-thaw cycles increased. Air-entraining agent can significantlyreduce the damage of concrete structure due to freeze-thaw cycles. The loss of fracture energyand the loss of relative dynamic elastic modulus kept a good linear relationship.

作者: Zuojun Ning Hengjing Ba Yingzi Yang

作者单位: School of Civil Engineering,Harbin Institute of Technology,China

会议类型: 国际会议

会议名称: 1st International Conference on Microstructure Related Durability of Cementitious Composites(首届与水泥基复合材料耐久性相关的微观结构国际会议)

会议地点: 南京

会议语种:英文

页码: 815-823

在线出版日期: 2008-10-13（万方平台首次上网日期，不代表论文的发表时间）