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Title: Development of low-pH cementitious materials for HLRW repositories

Abstract

One of the most accepted engineering construction concepts of underground repositories for high radioactive waste considers the use of low-pH cementitious materials. This paper deals with the design of those based on Ordinary Portland Cements with high contents of silica fume and/or fly ashes that modify most of the concrete 'standard' properties, the pore fluid composition and the microstructure of the hydrated products. Their resistance to long-term groundwater aggression is also evaluated. The results show that the use of OPC cement binders with high silica content produces low-pH pore waters and the microstructure of these cement pastes is different from the conventional OPC ones, generating C-S-H gels with lower CaO/SiO{sub 2} ratios that possibly bind alkali ions. Leaching tests show a good resistance of low-pH concretes against groundwater aggression although an altered front can be observed.

Authors:
;  [1];  [2]
  1. Instituto de CC. de la Construccion Eduardo Torroja, CSIC, Serrano Galvache 4, 28033 Madrid (Spain)
  2. INTECIN-Universidad de Buenos Aires, Av. Paseo Colon, 850. C1063ACV Buenos Aires (Argentina)
Publication Date:
OSTI Identifier:
21483648
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 40; Journal Issue: 8; Other Information: DOI: 10.1016/j.cemconres.2009.11.008; PII: S0008-8846(09)00339-1; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BINDERS; CALCIUM OXIDES; CONCRETES; CONSTRUCTION; ENGINEERING; FLY ASH; GELS; GROUND WATER; HIGH-LEVEL RADIOACTIVE WASTES; HYDRATION; LEACHING; MICROSTRUCTURE; PERFORMANCE; PH VALUE; PORTLAND CEMENT; RADIOACTIVE WASTE DISPOSAL; SILICA; SILICON OXIDES; STANDARDS; AEROSOL WASTES; ALKALINE EARTH METAL COMPOUNDS; ASHES; BUILDING MATERIALS; CALCIUM COMPOUNDS; CEMENTS; CHALCOGENIDES; COLLOIDS; COMBUSTION PRODUCTS; DISPERSIONS; DISSOLUTION; HYDROGEN COMPOUNDS; MANAGEMENT; MATERIALS; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTE MANAGEMENT; RADIOACTIVE WASTES; RESIDUES; SEPARATION PROCESSES; SILICON COMPOUNDS; SOLVATION; WASTE DISPOSAL; WASTE MANAGEMENT; WASTES; WATER

Citation Formats

Garcia Calvo, J.L., E-mail: jolgac@ietcc.csic.e, Hidalgo, A, Alonso, C, and Fernandez Luco, L. Development of low-pH cementitious materials for HLRW repositories. United States: N. p., 2010. Web. doi:10.1016/j.cemconres.2009.11.008.
Garcia Calvo, J.L., E-mail: jolgac@ietcc.csic.e, Hidalgo, A, Alonso, C, & Fernandez Luco, L. Development of low-pH cementitious materials for HLRW repositories. United States. doi:10.1016/j.cemconres.2009.11.008.
Garcia Calvo, J.L., E-mail: jolgac@ietcc.csic.e, Hidalgo, A, Alonso, C, and Fernandez Luco, L. Sun . "Development of low-pH cementitious materials for HLRW repositories". United States. doi:10.1016/j.cemconres.2009.11.008.
@article{osti_21483648,
title = {Development of low-pH cementitious materials for HLRW repositories},
author = {Garcia Calvo, J.L., E-mail: jolgac@ietcc.csic.e and Hidalgo, A and Alonso, C and Fernandez Luco, L},
abstractNote = {One of the most accepted engineering construction concepts of underground repositories for high radioactive waste considers the use of low-pH cementitious materials. This paper deals with the design of those based on Ordinary Portland Cements with high contents of silica fume and/or fly ashes that modify most of the concrete 'standard' properties, the pore fluid composition and the microstructure of the hydrated products. Their resistance to long-term groundwater aggression is also evaluated. The results show that the use of OPC cement binders with high silica content produces low-pH pore waters and the microstructure of these cement pastes is different from the conventional OPC ones, generating C-S-H gels with lower CaO/SiO{sub 2} ratios that possibly bind alkali ions. Leaching tests show a good resistance of low-pH concretes against groundwater aggression although an altered front can be observed.},
doi = {10.1016/j.cemconres.2009.11.008},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 8,
volume = 40,
place = {United States},
year = {2010},
month = {8}
}