Thaumasite form of sulfate attack in limestone cement mortars: A study on long term efficiency of mineral admixtures
Thaumasite form of sulfate attack in limestone cement mortars: A study on long term efficiency of mineral admixtures
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DOI：
10.1016/j.conbuildmat.2008.11.004
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发表时间：
2009-06
影响因子：
7.4
通讯作者：
A. Skaropoulou;S. Tsivilis;G. Kakali;J. Sharp;R. Swamy
中科院分区：
文献类型：
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作者：
A. Skaropoulou;S. Tsivilis;G. Kakali;J. Sharp;R. Swamy
由石灰石水泥制成的混凝土和砂浆可能由于碳硫硅钙石的形成而表现出缺乏耐久性。添加提高混凝土耐久性的矿物质有望减缓碳硫硅钙石的形成。研究了天然火山灰、粉煤灰、矿渣微粉和偏高岭土对石灰石水泥砂浆中碳硫硅钙石形成的影响。使用含有15%w/w石灰石的石灰石水泥。用上述矿物代替部分石灰石水泥制备砂浆试样。将试样浸入1.8%MgSO4溶液中，并在5和25°C下固化。根据目视检查、抗压强度、质量测量、超声脉冲速度测量和分析技术，报告了5年储存期后样品的状态。它的结论是使用特定的矿物，作为部分替代水泥，抑制碳硫硅钙石形成石灰石水泥砂浆。
Concrete and mortar made from limestone cement may exhibit a lack of durability due to the formation of thaumasite. The addition of minerals that improve the concrete durability is expected to slow down the formation of thaumasite. In this work the effect of natural pozzolana, fly ash, ground granulated blastfurnace slag and metakaolin on the thaumasite formation in limestone cement mortar is examined. A limestone cement, containing 15% w/w limestone, was used. Mortar specimens were prepared by replacing a part of limestone cement with the above minerals. The specimens were immersed in a 1.8% MgSO4solution and cured at 5 and 25°C. The status of the samples after a storage period of 5 years was reported based on visual inspection, compressive strength, mass measurements, ultrasonic pulse velocity measurements and analytical techniques. It is concluded that the use of specific minerals, as partial replacement of cement, inhibits thaumasite formation in limestone cement mortar.