混凝土应力腐蚀研究现状及问题

The Status Quo and Problem of Study of Stress Corrosion of Concrete

混凝土材料在实际工程中常常同时承受压力和腐蚀介质的双重作用 ,有必要研究混凝土的应力腐蚀效应。混凝土发展已经有一个半世纪了 ,但应力腐蚀的研究尚只有短短 10年左右的时间 ,远远不能满足工程应用的需要。高性能混凝土由于其高的强度、低水灰比而表现为高的脆性、低的变形 ,其应力腐蚀效应可能更加显著 ,应该深入进行研究 ,以满足下个世纪高性能混凝土广泛应用的需要。需要采用一些先进方法 ,对应力水平、腐蚀介质强度、腐蚀介质类型对混凝土力学性能、微观结构和耐久性的影响 ,以及各种抑制应力腐蚀的措施进行系统研究 ,以满足工程实际应用的要求。

? It is necessary to study the stress corrosion of concrete,for concrete structures are often under the action of stress and corrosion medium simultaneously. Concrete materials have been developed for more than 150 years,but the time of studying strss corrosion of concrete is only about 10 years,and this can not meet the application requirement of project.To meet the application requirement of HPC in the next cemtury,the stress corrosion of HPC should be studied thoroughly,because HPC is more likely to suffer stress corrosion owing to its high brittleness and low strain.To meet the application requirement,the effects of the level and kind of stress,the concentration and kind of corrosion medium on the properties of mechanics,micro structure,and durability,and the preventing approaches of stress corrosion of concrete should be studied systematically by the use of some advancing ways. 〔