Effect of blast furnace slag on self-healing of microcracks in cementitious materials
Effect of blast furnace slag on self-healing of microcracks in cementitious materials
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DOI：
10.1016/j.cemconres.2014.03.010
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发表时间：
2014-06-01
影响因子：
11.4
通讯作者：
Damidot, Denis
中科院分区：
文献类型：
--
作者：
Huang, Haoliang;Ye, Guang;Damidot, Denis
研究了高炉矿渣水泥净浆自修复的物理化学过程。在水泥净浆中矿渣含量为66%的情况下，以饱和Ca(OH)(2)溶液为活化剂，发现裂缝中形成的反应产物由C-S-H、钙矾石、水石榴石和OH-水滑石组成。反应产物中C-S-H的比例远大于其他矿物。裂纹中形成的大量钙矾石表明 SO42- 离子从本体糊中浸出，从而导致重新沉积。自愈在50小时内快速进行，然后减慢。根据热力学模型，当新形成的反应产物被碳化时，裂纹的填充率先增加后减少。形成硅胶、三水铝石、方解石等低溶矿物。与硅酸盐水泥浆体相比，当矿渣含量较高时，矿渣水泥浆体的自愈潜力较高。 (C) 2014 Elsevier Ltd. 保留所有权利。
The physico-chemical process of self-healing in blast furnace slag cement paste was investigated in this paper. With a high slag content i.e., 66% in cement paste and saturated Ca(OH)(2) solution as activator, it was found that the reaction products formed in cracks are composed of C-S-H, ettringite, hydrogarnet and OH-hydrotalcite. The fraction of C-S-H in the reaction products is much larger than the other minerals. Large amount of ettringite formed in cracks indicates the leaching of SO42- ions from the bulk paste and consequently the reaystallization. Self-healing proceeds fast within 50 h and then slows down. According to thermodynamic modeling, when the newly formed reaction products are carbonated, the filling fraction of crack increases first and then decreases. Low soluble minerals such as silica gel, gibbsite and calcite are formed. Compared to Portland cement paste, the potential of self-healing in slag cement paste is higher when the percentage of slag is high. (C) 2014 Elsevier Ltd. All rights reserved.