Formulating a low-alkalinity, high-resistance and low-heat concrete for radioactive waste repositories
Formulating a low-alkalinity, high-resistance and low-heat concrete for radioactive waste repositories
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DOI：
10.1016/j.cemconres.2006.10.005
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发表时间：
2006-12-01
影响因子：
11.4
通讯作者：
Bourbon, Xavier
中科院分区：
文献类型：
--
作者：
Coumes, Celine Cau Dit;Courtois, Simone;Bourbon, Xavier
为了配制和表征与地下废物处置环境相容的低碱度和低热水泥，进行了调查。对几种由普通硅酸盐水泥（OPC）、快速反应的火山灰（硅灰（SF）或偏高岭土（MK））以及在某些情况下缓慢反应的产物（粉煤灰（FA）或高炉渣（BFS））组成的体系进行了比较。一些OPC和SF的二元混合物，以及一些OPC、SF和FA或BFS的三元混合物取得了令人满意的结果：与完全水化水泥的平衡水的pH值降至11以下。研究了低ph共混物中高FA和SF含量对标准砂浆性能的影响。SF和FA的结合似乎很有吸引力，因为SF弥补了FA的低反应性，而FA可以减少砂浆的需水量和尺寸变化。最后，用两种低ph水泥制备低热（半绝热条件下δ T< 20℃）和高强度（约70-80 MPa）混凝土：一种是由60% OPC和40% SF组成的二元混合物，一种是由37.5% OPC、32.5% SF和30% FA组成的三元混合物。(C) 2006年Elsevier Ltd.出版
Investigations were carried out in order to formulate and characterize low-alkalinity and low-heat cements which would be compatible with an underground waste repository environment. Several systems comprising Ordinary Portland Cement (OPC), a fast-reacting pozzolan (silica fume (SF) or metakaolin (MK)) and, in some cases, a slow-reacting product (fly ash (FA) or blastfurnace slag (BFS)) were compared. Promising results were obtained with some binary mixtures of OPC and SF, and with some ternary blends of OPC, SF and FA or BFS: pH of water in equilibrium with the fully hydrated cements dropped below 11. Dependence of the properties of standard mortars on the high contents of FA and SF in the low-pH blends was examined. Combining SF and FA seemed attractive since SF compensated for the low reactivity of FA, while FA allowed to reduce the water demand, and dimensional variations of the mortars. Finally, low-heat (Delta T< 20 degrees C under semi-adiabatic conditions) and high strength (approximate to 70-80 MPa) concretes were prepared from two low-pH cements: a binary blend made from 60% of OPC and 40% of SF, and a ternary blend including 37.5% OPC, 32.5% SF and 30% FA. (C) 2006 Published by Elsevier Ltd.