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Study on analysis and preventive measures for damage of durability of reinforced concrete bridges

SUN Jia-ying~1,HUANG Cheng-hua~2 (1.Shanghai Municipal Engineering Research Institute, Shanghai 200031, China; 2.State Key Lab of Concrete Materials Research, Tongji University, Shanghai 200092, China)  
Based on the damage of five corrosive bridges concrete in Shanghai, it suggested that the strength and durability of C30 concrete have been decreased badly. The main measure in this article is to design the durability of concrete aiming at the reasons that durability decreases at the different environmental conditions. The results of the research suggested that the over-replacement with active mixture technology could assuredly make Cl~- penetrative resistance, freezing and thawing resistance and carbonizing resistance improve. It was best when coefficient of over-replacement was 1.3, and slag was best followed by steel slag, and then fly ash. Furthermore, the over-replacement with active mixture technology could stay concrete forepart shrinkage rate, thereby the durability of concrete improved.
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