Formulating a low-alkalinity, high-resistance and low-heat concrete for radioactive waste repositories
- Commissariat a l'Energie Atomique, DTCD/SPDE/L2ED, CEN Valrho, 30207 Bagnols-sur-Ceze cedex (France)
- Universite Aix-Marseille II, Laboratoire EA(MS), Avenue Gaston Berger, 13625 Aix-en-Provence cedex (France)
- Ecole des Mines d'Ales, Centre des Materiaux de Grande Diffusion, 6 avenue de Clavieres, 30319 Ales Cedex (France)
- EDF, Centre de Recherche des Renardieres, BP1 Ecuelles, 77250 Moret-sur-Loing (France)
- ANDRA, Direction Scientifique/Service Colis-Materiaux, Parc de la Croix Blanche, 1-7 rue Jean Monnet, 92298 Chatenay-Malabry cedex (France)
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 deg. C under semi-adiabatic conditions) and high strength ({approx} 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.
- OSTI ID:
- 20871550
- Journal Information:
- Cement and Concrete Research, Vol. 36, Issue 12; Other Information: DOI: 10.1016/j.cemconres.2006.10.005; PII: S0008-8846(06)00248-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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