摘要
进行了普通混凝土(OPC)和高性能混凝土(HPC)试件在质量分数为3.5%,12.5%,25%的醋酸钙镁(CMA)溶液中的浸泡试验,测定了腐蚀过程中混凝土试件的质量变化和相对动弹性模量,跟踪了试件表面的剥落特征,比较了硅酸盐水泥HPC和抗硫酸盐水泥HPC的抗CMA腐蚀性。结果表明:CMA对水泥混凝土的腐蚀破坏以表面剥落及其引起的质量损失为特征,反映内在质量的相对动弹性模量并没有显著降低;混凝土的CMA腐蚀剥落程度与CMA溶液浓度和腐蚀时间有关,当浸泡腐蚀时间超过450d以后,其腐蚀剥落现象开始加剧,而且浓度越大,腐蚀剥落越明显;25%质量分数CMA溶液对OPC具有非常严重的腐蚀破坏,对P.Ⅱ52.5水泥HPC的腐蚀破坏最小,对P.HSR42.5水泥HPC的腐蚀破坏介于两者之间;CMA对混凝土的腐蚀破坏属于表面腐蚀剥落,并不会在混凝土内部产生腐蚀微裂缝,这为今后研究CMA对混凝土的腐蚀破坏机理提供了可靠的试验基础;采用P.Ⅱ52.5水泥HPC可以解决机场道面水泥混凝土的CMA机场道面除冰液的腐蚀破坏问题,为中国北方地区机场道面HPC的研发提供了依据。
The immersion tests that ordinary Portland concrete （OPC） and high performance concrete （HPC） specimens placed in calcium magnesium acetate （CMA） of 3.5%, 12. 5% and 25% mass fraction of solution were carried out, and the mass loss and the relative dynamic elastic modulus were measured. Meanwhile, the surface exfoliative characteristics of specimens were observed, the corrosion resistances between Portland cement HPC and resisting sulfate cement HPC in CMA were compared. The results show that the surface exfoliative phenomenon and the quality loss are the main characteristics of corrosive damage in the CMA, its inner relative dynamic elastic modulus doesn＇t reduced significantly. The concrete＇s CMA corrosive exfoliative degree is related with the concentration of CMA solution and the corrosion time. When soaked corrosive time is more than 450 d, the corrosive exfoliative phenomena grow serious when the CMA＇s concentration becomes greater, the corrosive exfoliative phenomenon is more obvious. The 250/00 mass fraction of CMA solution has the most severe corrosion in OPC among the threekinds of concrete and the HPC-P Ⅱ 52.5 is better than the HPC-P HSR42.5. Therefore, the CMA＇s corrosion and damage to the concrete are the surface corrosion not the interior corrosion, and the research of CMA to the concrete corrosion damage mechanism provides reliable experimental basis for the future. Furthermore, adopting HPC-PⅡ 11 52.5 cement can solve the corrosive and damage problem which caused by the CMA deicing fluid and can provide a basis for the airport pavement HPC＇s research in the northern region.
出处
《建筑科学与工程学报》
CAS
北大核心
2012年第2期61-66,共6页
Journal of Architecture and Civil Engineering
基金
国家重点基础研究发展计划("九七三"计划)项目(2009CB623203)
国家自然科学基金项目(51178221)
关键词
水泥混凝土
机场道面除冰液
醋酸钙镁
化学腐蚀
剥落
cement concrete
airport pavement deicing fluid
calcium magnesium acetate
chemi-cal corrosion
exfoliation
