Use of mineral admixtures to improve the resistance of limestone cement concrete against thaumasite form of sulfate attack
Use of mineral admixtures to improve the resistance of limestone cement concrete against thaumasite form of sulfate attack
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DOI：
10.1016/j.cemconcomp.2013.01.007
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发表时间：
2013-03
影响因子：
10.5
通讯作者：
A. Skaropoulou;K. Sotiriadis;G. Kakali;S. Tsivilis
中科院分区：
文献类型：
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作者：
A. Skaropoulou;K. Sotiriadis;G. Kakali;S. Tsivilis
本文研究了矿物外加剂对石灰石水泥混凝土中硫酸盐侵蚀的影响。此外，还研究了砂的类型（钙质或硅质）和储存温度的影响。石灰石水泥，含有15%的石灰石。用所研究的矿物代替部分水泥制备混凝土试件。样品浸泡在1.8% mgso4溶液中，在5°C和25°C下保存3年。由石灰石水泥和粉煤灰、高炉炉渣或偏高岭土制成的设计良好的混凝土，似乎有能力抵御硫马石形式的硫酸盐侵蚀。天然火山灰的加入对混凝土抗硫酸盐性能的改善有限。低温条件下，砂的种类及其与水泥浆体的粘结性对混凝土的性能有显著影响。最后，在25°C的硫酸盐溶液中，没有观察到试样的损伤。
In this work the effect of mineral admixtures on the thaumasite form of sulfate attack in limestone cement concrete is studied. Additionally, the effect of the type of sand (calcareous or siliceous) and the storage temperature is investigated. Limestone cement, containing 15% limestone, was used. Concrete specimens were prepared by replacing a part of cement with the studied minerals. The specimens were immersed in a 1.8% MgSO4solution and stored at 5°C and 25°C for 3years. A well designed concrete made with limestone cement and fly ash, blastfurnace slag or metakaolin seems to have the ability to withstand thaumasite form of sulfate attack. The addition of natural pozzolana presented only a limited improvement of concrete’s sulfate resistance. The type of the sand and its cohesion with the cement paste has a remarkable effect on the performance of concrete at low temperature. Finally, no damage was observed in the specimens exposed to sulfate solution at 25°C.