硅酸盐学报2009，Vol.37Issue(5)：880-884,5.
酸雨侵蚀下水泥石物相组成变化的微观分析
MICROANALYSIS OF THE CHANGE OF PHASE COMPOSITIONS OF HARDENED CEMENT PASTE IN RESPONSE TO ACID RAIN ATTACK
摘要
Abstract
The change of phase compositions of hardened ordinary Portland cement paste exposed to simulated acid rain was analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray diffraction analysis. The pH value of the simulated acid rain, containing SO42-, NO3-, NH4+ and Mg2+, was 2. The results show that under the sus2+taining action of acid rain, normal cement hydrated products, such as Ca(OH)2, hydrated calcium silicate (C-S-H) gel, xCaO·Al2O3·yH2O(CxAHy) and ettringite are decomposed gradually and transformed into a white mushy mixture consisting of CaSO4·2H2O crystal, SiO2·nH2O gel and Al2O3·nH2O gel. The destruction of the cement matrix by acid rain attack is predominantly due to the coordinated effect of the dissolving erosion by H+ and the expanding erosion by SO42-, and occurs from the surface to the interior of materials.关键词
水泥净浆/酸雨侵蚀/物相组成/腐蚀机理/微观分析Key words
cement paste/acid rain attack/phase compositions/corrosion mechanism/microanalysis分类
土木建筑引用本文复制引用
王凯,马保国,龙世宗..酸雨侵蚀下水泥石物相组成变化的微观分析[J].硅酸盐学报,2009,37(5):880-884,5.基金项目
国家高技术发展计划(2005AA332010)资助项目. （2005AA332010）
