Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.04.003· OSTI ID:21443310

Blanc, Ph ^[1]; Bourbon, X ^[2]; Lassin, A; Gaucher, E C ^[1]

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1. BRGM, 3 Avenue Claude Guillemin, 45060 Orleans Cedex 2 (France)
2. ANDRA - Scientific Division, 1-7 Rue Jean Monnet, Parc de la Croix Blanche, 92298 Chatenay Malabry Cedex (France)

In the context of waste confinement, concrete may be used both as a confinement and as a building material. Concerning radwaste, the heat released during radioactive decay will modify the equilibrium constants of the minerals forming the concrete. The present work aims to elucidate the temperature dependency of the thermodynamic functions related to minerals from the concrete or associated with some of its degradation products. A large set of experimental data has been collected, for the chemical systems SO{sub 3}-Al{sub 2}O{sub 3}-CaO-CO{sub 2}-Cl-H{sub 2}O and SiO{sub 2}-Al{sub 2}O{sub 3}-CaO-H{sub 2}O, including iron and magnesium bearing phases. Most of the data collected concern experiments in aqueous media but results from calorimetric studies were also included, when available. Based on selected thermodynamic properties for each phase, predominance diagrams were drawn for the chemical elements listed above. Phase relations reported into predominance diagram appear rather consistent with most of the literature results. The case of katoite has been especially discussed, because it shows inconsistencies with respect to a hydrogarnet-grossular solid solution and with respect to phase relations reported into already published works. Finally, we underline the chemical compatibility of Portland cement pastes with carbonate aggregates, compared to silicates, for long-term storage applications.

• OSTI ID: 21443310
• Journal Information: Cement and Concrete Research, Vol. 40, Issue 9; Other Information: DOI: 10.1016/j.cemconres.2010.04.003; PII: S0008-8846(10)00103-1; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CALCIUM OXIDES
CALORIMETRY
CARBON DIOXIDE
CARBONATES
CHLORIDES
COMPATIBILITY
CONCRETES
DIAGRAMS
EQUILIBRIUM
HEAT
IRON
MAGNESIUM
NUCLEAR DECAY
PORTLAND CEMENT
RADIOACTIVE WASTES
SILICATES
SILICON OXIDES
SOLID SOLUTIONS
SULFITES
THERMODYNAMIC PROPERTIES
WATER
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CEMENTS
CHALCOGENIDES
CHLORINE COMPOUNDS
DECAY
DISPERSIONS
ELEMENTS
ENERGY
HALIDES
HALOGEN COMPOUNDS
HOMOGENEOUS MIXTURES
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIOACTIVE MATERIALS
SILICON COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
TRANSITION ELEMENTS
WASTES