Experimental Research on Carbonation of Forced Concrete Specimens

Abstract:

For the purpose of research on carbonation regularity of concrete bridges, the durability experiments of forced concrete specimens in accelerated carbonation corrosive environments were carried out. The degradation mechanism of carbonized concrete structure was analyzed. The results show that tensile or compressive stress can accelerate or slow down carbonation rate, respectively. Larger changes of stress will cause larger changes of carbonation rate. The carbonation depth of bridge-common used C50 strength concrete is far smaller than low strength concrete but the relative carbonation depth of C50 strength concrete applied tensile stress is larger than low strength concrete. According to the tests, the working stress influence coefficient in existing concrete carbonation depth prediction model was modified. The crack in concrete bridges has little effect on concrete carbonation if its width can meet standard requirements, and the durable performance of prestressed concrete bridges is better than reinforced concrete bridges.