制革排污管盐结晶区混凝土硫酸盐侵蚀的研究  

Sulfate Attack on Concrete in Salt Crystallization Zone of Tannery Sewage Pipeline

作　　者：唐旭光[1,2] 谢友均[1] 龙广成[1] 马昆林[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]湖南科技大学土木工程学院,湘潭411201

出　　处：《腐蚀科学与防护技术》2016年第2期103-108,共6页Corrosion Science and Protection Technology

摘　　要：基于对制革工业园排污混凝土管破坏特征的现场调查和对混凝土的微观形貌及腐蚀产物的测试分析,探讨了污水对制革排污管混凝土的硫酸盐侵蚀破坏机理。结果表明,埋于地下的排污混凝土管,污水含有的硫酸盐对管内壁混凝土为半浸泡的盐侵蚀作用,内壁混凝土受化学腐蚀与物理侵蚀的双重复合作用。污水对管壁混凝土的化学腐蚀主要是低SO_4^(2-)浓度下的钙矾石型侵蚀(EA)、碳硫硅钙石型硫酸盐侵蚀(TSA)、高钙硅比C-S-H凝胶向低钙硅比C-S-H凝胶转化、钙矾石和碳硫硅钙石向石膏转化等。物理结晶侵蚀劣化则与盐的种类、环境温湿度及变动情况、混凝土的渗透性等因素相关。Deterioration process of concrete in salts crystallization zone of tannery sewage pipelines that half- buried（half- immersed） in sulfate solution environment was studied by examining the appearance and, microstructure and phase composition of the broken concrete sewage pipe, as well as the local environmental conditions, water quality analysis etc. It shows that concrete in salts crystallization regions that half- buried in sulfate solution environment is typically suffered from both of chemical corrosion and physical attack. The chemical corrosion processes includes the corrosion attacks of the formed products ettringite and thaumasite in low sulfate ion concentration, the transformation process of the C-S-H gel with high ratio of Ca to Si into depleted C-S-H gel, and the conversion process of ettringite and thaumasite into gypsum etc. The physical attack may be related to the type of salt species, temperature and humidity of environment, and the permeability of concrete.

关 键 词：制革综合污水 埋地混凝土 硫酸盐侵蚀 盐结晶区 侵蚀机理 

分 类 号：TG172[金属学及工艺—金属表面处理]