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盐湖地区混凝土的长期腐蚀产物与腐蚀机理
作者:余红发 孙伟 王甲春 屈武 鄢良慧 魏占元 
单位:东南大学材料科学与工程系 东南大学材料科学与工程系 沈阳建筑工程学院材料科学与工程系 青海省电力设计院 沈阳建筑工程学院材料科学与工程系 青海省电力设计院 南京210096 沈阳建筑工程学院材料科学与工程系 沈阳110015  南京210096  沈阳110015  西宁810008  沈阳110015  西宁810008 
关键词:盐湖  腐蚀产物  水化硅酸钙-水硅酸镁  碱硅凝胶产物 
分类号:TU528.01
出版年,卷(期):页码:2003,31(5):434-440
DOI:
摘要:
运用XRD ,DTA -TG ,SEM -EDAX和IR方法研究了盐湖地区暴露 2 0a的实际混凝土工程的腐蚀产物 ,发现了混凝土在盐湖卤水腐蚀条件下 3种类型的化学腐蚀。首次报道了盐湖卤水中的碱金属离子对水化硅酸钙 (CSH)的两种腐蚀产物 ,即水化硅酸钙水硅酸镁CSH -MSH的过渡产物含水硅酸钙镁凝胶 (C1 -xMx) 1 1 5~ 1 70 SH(x =0 2 2~ 0 3 9)以及Na离子取代Ca的碱硅凝胶产物 (C1 -xNx) 1 85~ 1 6 0 SH (x =0 3 9~ 0 63 )。此外 ,还提出了水泥的 3种水化产物即氢氧钙石 (CH)、水化铝酸钙 (C3AH6 )和水化硅酸钙 (CSH)在盐湖地区的化学腐蚀机理。
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Attack products of concrete having exposed in salt lake for 20 years were investigated by XRD, DTA-TG, SEM-EDAX and IR method Three types of chemical corrosion on concrete exposed to salt lake bittern are found and reported firstly in this paper The results show that two attack products are corroded by alkali metal ions on calcium silicate hydrate CSH, i e transition pro duct calcium-magnesium silicate hydrate (C 1- x M x ) 1 15—1 70 SH( x =0 22—0 39)of calcium silicate hydrate CSH-magnesium silicate hydrate MSH and another type is the formation of alkali silica gel(C 1- x N x ) 1 85—1 60 SH( x =0 39—0 63) by Na ions substituting Ca ions Besides corrosion mechanism of three types of cement hydration products in salt lakes, i e portlandite CH, calcium aluminates hydrate C 3AH 6 and CSH gel, are proposed
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基金项目:
国家自然科学基金 (5 993 8170 )重点项目;; 国家自然科学(5 0 1780 44 )基金项目;; 青海省电力局 2 0 0 1年科技攻关项目 (4 2 0 0 3 0 10 11)
作者简介:
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参考文献:
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