Ke Xinyuan, Bernal Susan A, Hussein Oday H, Provis John L
Department of Materials Science and Engineering, Sir Robert Hadfield Building, The University of Sheffield, Sheffield, S1 3JD UK.
Mater Struct. 2017;50(6):252. doi: 10.1617/s11527-017-1121-8. Epub 2017 Dec 1.
This study evaluates the chloride binding capacity and the migration of chloride in sodium carbonate-activated slag cements and mortars. The effect on chloride mobility and binding of adding a calcined layered double hydroxide (CLDH) to the binder mix was also assessed. Significantly improved durability characteristics can be achieved for sodium carbonate-activated slag mortars by the addition of small fractions of CLDH, as a consequence of a higher degree of reaction, higher chloride binding capacity, and the refined pore structures present in these modified materials, in comparison with alkali-activated cements produced without CLDH. The addition of CLDH enables the production of sodium carbonate-activated slag cements with notably reduced chloride ingress compared to silicate activated slag cements.
本研究评估了碳酸钠激发矿渣水泥及砂浆中氯离子的结合能力和迁移情况。还评估了向粘结剂混合物中添加煅烧层状双氢氧化物（CLDH）对氯离子迁移率和结合的影响。与未添加CLDH的碱激发水泥相比，通过添加少量CLDH，碳酸钠激发矿渣砂浆可显著提高耐久性，这是由于这些改性材料具有更高的反应程度、更高的氯离子结合能力以及细化的孔隙结构。与硅酸盐激发矿渣水泥相比，添加CLDH能够生产出氯化物侵入明显减少的碳酸钠激发矿渣水泥。
