高寒区混凝土多场耦合损伤劣化机制研究进展OA北大核心CSTPCD

In the actual service process,the concrete structure in alpine region is not only affected by vehicle load,but also by environmental factors such as salt corrosion and freeze-thaw.Under the action of multi-field coupling such as load,salt corrosion and freeze-thaw,the deterioration of concrete in alpine region involves the interaction of chemical,physical and mechanical effects.The complex chemical reaction between chloride salt and concrete produces expansive double salt,which leads to internal volume expansion of concrete and chemical damage.At the same time,freeze-thaw cycles and dynamic loads cause physical damage to concrete,and concrete deteriorates rapidly under the coupling of chemical damage and physical damage.In this paper,the research status of the influence of salt corrosion,freeze-thaw cycle and dynamic load multi-field coupling on the performance of concrete is reviewed,and the most advanced material non-destructive characterization techniques and modeling methods in this field are summarized.The prediction model of physical and chemical damage characteristic parameters is established from macro,fine and micro scales,and the damage degradation mechanism and degradation behavior prediction model of concrete under multi-field coupling are formed.Finally,the shortcomings of the current research are put forward.