酸雨对普通硅酸盐建筑物表面腐蚀的形态模拟研究

运用ＰＨ＝５．０，４．０，３．０的人工模酸雨和ＰＨ＝５．７的人工模拟自然降水，对普能硅酸盐水泥建筑物表面进行了同步模块降雨的试验，运用扫描电子显微镜分析被腐蚀的建筑物表面的形特征。

A MORPHOLOGY STUDY ON ACID RAIN EROSION OF THE SURFACE OF SILICATE-BUILDING MATERIALS

Synchronous sirnulative predpitation experiments of ordinary silicaiC cement constrUCtion surface are conduCted by using man--made sirnulative add rain (PH is 5.0, 4.0 and3.0 aspdrively) and man--made simulative natule preCipitation (PH 5.7). The characteristicmorphology of the eroded constrUction surface is analyst by means of scanning eleCtronmicroscopy (SEM). The results show that when the PH of acid rain is equivalent to or leSsthan 4.0, the profuses of ordinary silicate ~ construCtion surface erosion obviously reinforce.The small granule on the cement suAsce is eroded, tile exposure of subsurface of the largegranule sharply increases,and the ratio of tiny crackle on construCtion surface and subsurfacesharply rises. Tuns the erosion-- profuses of acid rain relatively enlarge in the aspCCt of earthe and effed area. In order tO proton urban construCtion and the equilibrium of man-- madeeresystffo, exhausting SO, of high density must be restricted and foeing incite acid rainmUSt be decreased.