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5~40 ℃不同硫酸盐侵蚀对铝酸盐水泥水化的影响
作者:王中平1 2  相1 赵亚婷1 杨浩宇1 徐玲琳1 2 刁桂芝3 刘光华3 
单位:(1. 同济大学材料科学与工程学院 上海 201804 2. 同济大学先进土木工程材料教育部重点实验室 上海 201804 3. 中国建筑材料科学研究总院 北京 100024) 
关键词:铝酸盐水泥 硫酸盐侵蚀 钙矾石 石膏 温度 
分类号:TU 528
出版年,卷(期):页码:2019,47(11):0-0
DOI:
摘要:

 采用X射线衍射仪、热分析仪、压汞仪等分别研究了5 ℃、20 ℃和40 ℃ Na2SO4和MgSO4侵蚀对铝酸盐水泥(CAC)水化的影响。结果表明:不同温度CAC水化产物的稳定性与硫酸盐种类密切相关。在5 ℃和20 ℃,浆体中主要生成十水铝酸钙(CAH10)和八水铝酸二钙(C2AH8),两者在MgSO4溶液侵蚀下均能稳定存在;但在Na2SO4溶液侵蚀下,C2AH8不稳定而基本消失,并有膨胀性钙矾石形成,试样强度降低。在40 ℃,浆体中主要生成C2AH8和六水铝酸三钙(C3AH6),其中C3AH6在Na2SO4溶液侵蚀下基本稳定,而C2AH8在两种硫酸盐溶液侵蚀下均基本消失,Na2SO4侵蚀样中形成大量钙矾石,MgSO4侵蚀样中则形成大量石膏,试样破坏严重。但在40 ℃高温条件下,两种硫酸盐侵蚀均可在一定程度上起到收缩补偿作用。

基金项目:
国家重点研发计划项目(2016YFB0303503);国家自然科学基金项目(51772212)。
作者简介:
参考文献:

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