Self-healing performance of concrete in sodium sulfate solution

被引：0
|
作者：
Liu, Surui [1 ]
Yang, Jiujun [1 ,3 ,4 ]
Wang, Zhanzhong [2 ]
Rong, Hui [1 ]
Zhang, Lei [1 ,3 ,4 ]
机构：
[1] College of Materials Science and Engineering, Tianjin Chengjian University, Tianjin
[2] China Railway 18th Bureau Group the 4th Engineering Company Limited, Tianjin
[3] Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin, Tianjin
[4] Engineering Research Centre of Construction Waste and Coal Waste Recycle Technology of Tianjin, Tianjin
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2015年 / 43卷 / 08期
关键词：
Concrete; Crack width; Cracks; Ettringite; Self-healing; Sodium sulfate solution; Strength;
D O I：
10.14062/j.issn.0454-5648.2015.08.10
中图分类号：
学科分类号：
摘要：
Concrete self-healing performance at different concentrations of sodium sulfate solution were investigated. The mechanical property, crack width, phase composition and microstructure before and after the repairment of concrete crack were analyzed. The results show that concrete self-healing performance in sodium sulfate solution is much better than that in water. The 2% sodium sulfate solution exhibits the optimum concrete self-healing performance at the curing age of 60 days, when the maximum strength restoration ratio is 126.5%. The 6% sodium sulfate solution has the optimum concrete self-healing performance in the curing age of 28 d, and the strength restoration ratio reduces from the maximum value of 137.8% to 75.8% at the curing age of 60 d. The 4% sodium sulfate solution shows a proper self-healing performance. The amount and size of hydration products, such as ettringite, gypsum and C-S-H gel, increase with the increase of sodium sulfate solution concentration. Ettringite, which is wrapped in C-S-H gel, fills the crack and makes it healed. If the sodium sulfate solution concentration was in an inappropriate range, hydration products would gather and inflate, leading to the second crack. ©, 2015, Chinese Ceramic Society. All right reserved.
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页码：1083 / 1089
页数：6
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