Aging features and mechanism of Granite’s damage under the action of acidic chemical solutions

In the study on granite,the transformation of macroscopic appearances,microscopic structures,defect mor- phology,elements composition and porosity induced by acidic chemical corrosion are observed with SEM and electron spectrum. The aging features of interaction between granite and chemical solutions are analyzed based on the testing data at different soaking times of mass,elastic wave velocity of specimens and pH value of solutions,and ion chroma- tography detection results of solutions’ chemical constituents and concentration after soaking. According to the testing results of X-ray diffraction for mineral composition and X-ray fluorescence for chemical elements and compound of granite,the chemical reactions between granite and acidic solutions and rock chemical damage process during rock- chemical solutions interaction are discussed combined with chemical kinetics theory. The damage mechanism of chemi- cal corrosion on rock is related to the coupling impacts between properties,components of chemical solution and miner- al composition,structures such as particles,pores and cracks of rock,which finally changes the micro ingredients and structure of rock.