[1]余红发,孙伟,王甲春,等.盐湖地区侵蚀性离子在混凝土中的扩散及其相互作用[J].东南大学学报(自然科学版),2003,33(2):156-159.[doi:10.3969/j.issn.1001-0505.2003.02.010]
 Yu Hongfa,Sun Wei,Wang Jiachun,et al.Diffusion of corrosive ions into concrete exposed to salt lake and interaction between corrosive-ions and concrete[J].Journal of Southeast University (Natural Science Edition),2003,33(2):156-159.[doi:10.3969/j.issn.1001-0505.2003.02.010]
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盐湖地区侵蚀性离子在混凝土中的扩散及其相互作用()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
33
期数:
2003年第2期
页码:
156-159
栏目:
材料科学与工程
出版日期:
2003-03-20

文章信息/Info

Title:
Diffusion of corrosive ions into concrete exposed to salt lake and interaction between corrosive-ions and concrete
作者:
余红发12 孙伟1 王甲春2 屈武3 鄢良慧2 魏占元3
1 东南大学材料科学与工程系, 南京 210096; 2 沈阳建筑工程学院材料科学与工程系, 沈阳 110015; 3 青海省电力设计院,西宁 810008
Author(s):
Yu Hongfa12 Sun Wei1 Wang Jiachun2 Qu Wu3 Yan Lianghui2 Wei Zhanyuan3
1 Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China
2 Department of Materials Science and Engineering, Shenyang Architecture and Civil Engineering Institute, Shenyang 110015, China
关键词:
混凝土 盐湖 扩散 固溶 含水硅酸钙镁 碱硅凝胶
Keywords:
concrete salt lake diffusion solid solution calcium-magnesium silicate hydrate alkali-silicon gel
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2003.02.010
摘要:
采用化学分析方法探索了盐湖环境的Na+,K+,Mg2+,SO42-和Cl-离子在混凝土和钢筋混凝土结构中的扩散规律,并用XRD,DTA-TG和SEM-EDAX方法研究了侵蚀性离子与混凝土之间的相互作用机理.结果表明,Mg2+和SO42-离子在混凝土中呈现出不同的分布规律,Na+,K+和Cl-离子的扩散速度大小顺序为:VCl->VNa+VK+.盐湖侵蚀性离子渗入混凝土后,一部分吸附于孔隙内表面,结晶成食盐NaCl和光卤石KCl·MgCl2·6H2O; 另一部分与水化产物发生化学腐蚀,形成石膏CaSO4·2H2O,南极石CaCl2·6H2O和氢氧化镁Mg(OH)2; 还有一部分与CSH凝胶发生3种相互作用:吸附于凝胶粒子表面,进入凝胶结构形成含水硅酸钙镁(C1-xMx)1.15-1.70SH(x=0.22~0.39)和碱硅凝胶(C1-xNx)1.85-1.60SH(x=0.39~0.63).
Abstract:
Diffusion of Na+, K+, Mg2+, SO42- and Cl-ions into concrete and reinforced concrete structures exposed to salt lake was investigated by chemical analyzing. Interaction between corrosive-ions and concrete was studied by means of XRD, DTA-TG and SEM-EDAX method. Results show that Mg2+and SO42- ions present different distributions in concrete, and the rate of diffusivities are in the order of VCl->VNa+VK+. Some of the penetrated corrosive-ions are adsorbed to the inner surfaces of concrete holes, forming NaCl and KCl·MgCl2·6H2O; another part of the ions chemically react with cement hydration products, forming CaSO4·2H2O, CaCl2·6H2O and Mg(OH)2. And three kinds of interactions occur between the residual penetrated corrosive-ions and CSH gel, namely adsorption to surfaces of CSH gel grains, ingress into the gel forming calcium-magnesium silicate hydrate(C1-xMx)1.15-1.70SH(x=0.22-0.39)or alkali-silicon gel(C1-xNx)1.85-1.60SH(x=0.39-0.63).

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备注/Memo

备注/Memo:
基金项目: 国家自然科学基金重点资助项目(59938170)、国家自然科学基金资助项目(50178044)、青海省电力局2001年科技攻关资助项目(4200301011).
作者简介: 余红发(1964—),男,博士生,教授,yuhongfa@hotmail.com; 孙伟(联系人),女,教授,博士生导师,sunwei@seu.edu.cn.
更新日期/Last Update: 2003-03-20