Research On The Durability Of Fly Ash Concrete Under Acid Rain

With the development of modern industry and the increase in energy consumption, the acid emissions have increased, and the acid rain phenomenon has become more and more serious. Acid rain phenomenon is one of the top ten problems which are threat to the environment. Now China has become the third largest acid rain area in the world following Europe and North America. In the acid rain area, a large number of concrete structures exposed to the acid rain directly, and subjected to aid rain corrosion. That causes the deterioration of concrete durability, and even results in the damage of concrete structure. The huge economic losses are brought to the society.According to the composition and the characteristics of acid rain in our country, the simulated acid rain is configured, and the artificial simulated acid rain experiment is adopted. The specimens performed periodically dip in through dry-wet cycle method in the laboratory, and the test on corrosion of fly ash concrete under aid rain is carried out. The experiment results indicate that aid rain not only influence on concrete surface condition, but also influence on concrete quality, cube compressive strength of concrete, and neutralization depth of concrete. At the same time, the effect of every factor such as pH, SO₄^2- on the quality change of fly ash concrete, the compressive strength change of fly ash concrete, and the neutralization depth of fly ash concrete is studied qualitatively.Finally, according to the dimension analysis method, the forecasting model of neutralization depth of fly ash concrete is established, and the corrosion of concrete under aid rain is predicted better. The model has certain referential value for the design of concrete durability and life prediction.