在盐湖卤水环境中混凝土应力腐蚀行为

Stress corrosion of concretes exposed to salt lake bittern

用中型千斤顶加载装置施加30%-40%弯曲荷载,研究普通混凝土（OPC）、掺与不掺矿物掺合料的高强混凝土（HSC）、复合掺加矿物掺合料的钢纤维增强高强混凝土（SFRHSC）,在中国典型盐湖卤水中应力腐蚀后的力学性能变化.结果表明,在盐湖环境中,混凝土的应力腐蚀抗压强度低于非应力腐蚀抗压强度,抗压腐蚀系数明显低于其抗折腐蚀系数,根据抗压强度计算的应力腐蚀系数低于非应力腐蚀系数.此外,应力腐蚀系数的测定结果说明,SFRHSC适用于青海和西藏盐湖,不掺矿物掺合料的HSC适用于新疆和内蒙古盐湖.

Mechanical properties of ordinary Portland cement concrete （OPC）, high strength concrete （HSC）, with or without active additive, and steel fiber reinforced high strength concrete （SFRHSC） with active additive subjected to combined action of flexural load and bittern attacks were investigated, while the loads were 30% -40% of limiting flexural load generated by medium hydraulic jacks. Results show that compressive strength of samples subjected to combined actions of flexural load and bittern attacks is less than that subjected to single action of bittern attack. Corrosion - resisting coefficient according to compressive strength is much less than that to flexural strength. Stress corrosion -resisting coefficient according to compressive strength is lower than the corrosion coefficient without stress. According to the results of stress corrosion - resisting coefficient, SFRHPC adapts well to Qinghai and Tibet salt lakes, and HSC to Xinjiang and Inner Mongolia salt lakes.