硫酸铝盐水泥与硅酸盐水泥净浆水分蒸发区硫酸盐破坏对比  

Comparison of Paste Damage in Evaporation Zones of Portland Cement Paste and Calcium Sulphoaluminate Cement Paste

作　　者：刘赞群[1] 李湘宁[1] 邓德华[1] 候乐[1] 

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《硅酸盐学报》2016年第8期1173-1177,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51378508);长江学者和创新团队发展计划资助项目(IRT1296);国家"973"计划项目(2013CB036201)资助

摘　　要：将硫铝酸盐水泥净浆试件半浸泡在10%硫酸溶液中,运用环境扫描电子显微镜和X射线衍射仪研究了试件水分蒸发区的破坏特点,并对比了已有相同试验条件下硅酸盐水泥净浆试件破坏特征。结果表明:7 d后,硫铝酸盐水泥试件水分蒸发区产生了严重破坏,并在破坏部位检测到硫酸钠晶体,其破坏机理是硫酸盐物理结晶破坏;而硅酸盐水泥净浆试件水分蒸发区经过5个月后才产生破坏,在破坏净浆内部存在钙矾石和石膏等化学侵蚀产物,证明硫酸盐化学侵蚀破坏依然是主导普通硅酸盐水泥净浆试件水分蒸发区破坏的机理。Calcium sulphoaluminate cement paste was partially immersed in 10% Na2SO4 solution. The products in the damaged paste were analyzed by X-ray diffraction and environment scanning electron microsopy. The damage in the evaporation zone of calcium sulphoaluminate cement paste was investigated. The results show that the evaporation zone is damaged seriously and the classic salt crystallization occurs in the damage zone for 7 d. The calcium sulphaliuminate cement paste damage is due to Na2SO4 crystals appeared in damaged paste. However, portland cement paste is damaged after 5-month exposure, and ettringite and gypsum can be formed. The chemical sulfate attack is due to portland cement paste damage.

关 键 词：硫酸盐侵蚀 硫铝酸盐水泥 盐结晶 化学侵蚀 混凝土 

分 类 号：O482.3[理学—固体物理]