摘要
研究了水胶比(质量比)为0.35,0.45的普通混凝土在3种溶液[3.5%(质量分数,下同)NaCl溶液,5.0%Na2SO4溶液,3.5%NaCl–5.0%Na2SO4复合溶液]和2种腐蚀制度(长期浸泡和浸泡烘干循环)下混凝土的损伤失效规律、特点及损伤叠加的效应。结果表明:在腐蚀初期,腐蚀溶液中硫酸盐的存在提高了混凝土抗氯离子扩散能力;腐蚀后期则降低之。复合溶液中氯盐的存在拉长了各腐蚀阶段时间,延缓了混凝土的硫酸盐损伤进程。混凝土经浸泡烘干循环,其相对动弹性模量(Erd)变化为下降、线性增加、缓慢下降和加速下降4个阶段。此外,用现代测试技术研究了上述规律产生的微观机理。
The damage process of concretes with water to cement mass ratios of 0.35 and 0.45 under continuous immersion or immersion-dry cycling conditions in solutions of 3.5 % NaCl （in mass, the same below）, 5 % Na2SO4, and composite of 3.5 % NaCl＋5.0% Na2SO4 were studied. The interactive effect of sulfate and chloride on the concrete damage process was also investigated. The results show that the presence of sulfate in the composite solution defers the ingress of chloride into concretes in the early exposure stage, but accelerates it in the later exposure stage. The presence of chloride in the composite solution retards the deterioration of the concretes caused by sulfate. When under immersion-dry cycling conditions, the relative dynamic module of elasticity of the concretes Erd exhibits a decreasing stage followed by a linear increasing stage, then a slowly decreasing stage, and finally the failure stage. The mechanism was also investigated by modern testing and analysis techniques.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第5期630-635,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(59938170)
江苏省重大工程(STDQ–04HT20SY–010)资助项目。
关键词
混凝土
氯盐
硫酸盐
浸泡烘干循环
交互作用
concrete
chloride
sulfate
immersion-dry cycling
interactive effect
