The Experiment Research On Anti-corrosion By Sulfuric Acid Of Concrete And Cement Mortar

As the rapid development of industrialization and urbanization, acid rain has gradually become a global issue. The component of acid rain in China is coal-generated sulfur oxides and is sulfuric acid-based acid rain, hence the study of sulfuric acid corrosion of the concrete or cement mortar is of significantly importance.In this dissertation, the concrete and the different admixture of cement mortar (where, by using different proportions of fly ash or silica fume replace the same amount of cement in some specimens respectively) are served as the objects of research, through the long-term immersion test and theoretical analysis, the corrosion mechanisms and the laws by the sulfuric acid are revealed. The main research contents and methods are as follows:By recording the amount of sulfuric acid consumed in a certain period of time, the law of the acid consumption rate varying with time is obtained. Based on reaction boundary layer tentative, the corrosion mechanism and a theoretical model are proposed. By analyzing the test data, which shows that the theoretical model can well reflect the results. At the same time, the validity of theoretical model is proved.Through the non-parametric regression analysis or partial correlation analysis, the law of concrete or cement mortar corrosion by sulfuric acid is obtained. And moreover, the conclusion that the relation between the influence of fly ash or silica fume on anti-corrosion by sulfuric acid of cement mortar and water cement ratio and fluidity is obtained.The research results obtained in this dissertation provide a foundation for the further study of structural materials corrosion by sulfuric acid and a theoretical support for an early settlement of the durability of concrete structure in the sulfuric acid environment.This dissertation is part of the project sponsored by the Natural Science Foundation of China and Yunnan Province (Grant No.51078175,2008E038M).