Study On The High Performance Concrete Carbonization And Correlative Capability

Concrete protects the steel against corrosion for it provides the alkaline condition. Carbonization is a key factor that makes alkalinity of concrete reduce. The high performance concrete is applied in engineering field increasingly for its high fluidness , high intensity and good durability(carbonization capability). The high performance concrete is synthesized by low water/cement ratio, high quality fly ash , superplasticized admixture and air entraining in this paper. The paper based on the Water Project (the transportation of water from the south to the north) analyzes the carbonization idiosyncrasy and correlative capability systematically. The result can be a reference to generalize the application range of the high performance concrete and strengthen the research of the high performance concrete.Firstly, the paper analyzes the influence of environment factors (such as the concentration of CO2, relative humidity etc. )on the carbonization properties of high performance concrete and the reasons of the influence by the way of microcosmic analyses and theories.Secondly, the paper analyzes the influence of fly ash, superplasticized admixture and air entraining on the carbonization capability of the concrete by the way of carbonization test and microcosmic analyses. It' s show the advantage of high performance concrete in carbonization properties relative to common concrete.Then, the paper analyzes the influence of carbonization on the development of intensity of high performance concrete by the way of intensity test. And it analyzes the pore structure of the mortar in the concrete to find the reason.Finally, the paper puts forward the study of the relationship between the carbonization and steel bar corrosion. And it makes a comparisonbetween high performance concrete and common concrete regarding the capability of protecting steel.