研究了硅灰、粉煤灰、矿渣对水泥砂浆TSA侵蚀的影响,采用掺30%石灰石填料的砂浆件,测试各砂浆在5±1℃的2%MgSO4溶液中浸泡1年后的外观、强度及矿物成分变化.结果表明:掺石灰石粉使水泥砂浆受侵蚀后表面呈软泥状,主要腐蚀产物为硅灰石膏和石膏,表现为典型的TSA破坏特征,其强度损失率大于纯水泥砂浆.矿物掺合料的加入降低了水泥石中CH晶体含量,从而在一定程度上提高了水泥砂浆的抗TSA侵蚀能力.矿物掺合料对水泥石中CH晶体的减少与对抗TSA侵蚀性的改善效果具有相同的规律,其优劣次序为:60%矿渣粉>5%硅灰+25%矿渣粉>8%硅灰>30%矿渣粉>20%粉煤灰>无掺合料.
参考文献
| [1] | Norah Crammond .The occurrence of thaumasite in modern construction - a review[J].Cement & concrete composites,2002(3/4):393-402. |
| [2] | E. Freyburg;A.M. Berninger .Field experiences in concrete deterioration by thaumasite formation: possibilities and problems in thaumasite analysis[J].Cement & concrete composites,2003(8):1105-1110. |
| [3] | Thaumasite Expert Group .The thaumasite form of sulfate attack:risks,diagnosis,remedial works and guidance on new construction[R].London:Department of the Environment,Transport and the Regions,1999. |
| [4] | S. A. Hartshorn;J. H. Sharp;R. N. Swamy .The thaumasite form of sulfate attack in Portland-limestone cement mortars stored in magnesium sulfate solution[J].Cement & concrete composites,2002(3/4):351-359. |
| [5] | G. Kakali;S. Tsivilis;A. Skaropoulou .Parameters affecting thaumasite formation in limestone cement mortar[J].Cement & concrete composites,2003(8):977-981. |
| [6] | 马保国,高小建,何忠茂,董荣珍.混凝土在SO42-和CO32-共同存在下的腐蚀破坏[J].硅酸盐学报,2004(10):1219-1224. |
| [7] | S.Tsivilisa;E.Chaniotakisb .A study on the parameters affecting the properties of Portland limestone cements[J].Cement & concrete composites,1999(2):107-116. |
| [8] | 高小建;马保国;朱洪波.低温环境中含石灰石粉水泥砂浆的硫酸盐侵蚀[J].材料研究学报 |
| [9] | E.E. Lachowski;S.J. Barnett;D.E. Macphee .Transmission electron optical study of ettringite and thaumasite[J].Cement & concrete composites,2003(8):819-822. |
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