关键词: 高性能混凝土;卤水腐蚀;强度;最佳配合比

Abstract: Aiming at the research of concrete durability in the construction of rail transit engineering in Xining,Qinghai Province,HPC with different mixture ratio was made, and the changes of compression and flexural strength with corrosion age during the 2 year corrosion period were recorded and analyzed. The results show that:the change of flexural and compressive strength of concrete is closely related to ion erosion in the period of 0.5-1.0a、1.0-1.5a、1.5-2.0a at the bittern corrosion environment.The flexural strength was enhanced and the compressive strength was reduced.in the age.The HPC specimens of Ca50z marked as the best mixture ratio show good corrosion resistance.The addition of mineral admixture can effectively improve the corrosion resistance of concrete.The damage of concrete caused by sulfate ion erosion is one of the reasons for its decrease of compressive strength,and chloride can slow down the rate of sulfate attack.

Key words: high performance concrete;the bittern corrosion;strength;the best mixture ratio