Modelling chemical degradation of concrete during leaching with rain and soil water types
- Belgian Nuclear Research Centre (SCK-CEN), Institute for Environment, Health, and Safety, Boeretang 200, B-2400 Mol (Belgium)
Percolation of external water through concrete results in the degradation of cement and changes the concrete pore water and solid phase composition. The assessment of long-term degradation of concrete is possible by means of model simulation. This paper describes simulations of chemical degradation of cement for different types of rain and soil water at an ambient earth surface temperature (10 {sup o}C). Rain and soil water types were derived using generic equations and measurement of atmospheric boundary conditions representative for North-Belgium. An up-to-date and consistent thermodynamic model is used to calculate the geochemical changes during chemical degradation of the concrete. A general pattern of four degradation stages was simulated with the third stage being the geochemically most complex stage involving reactions with calcium-silicate hydrates, AFm and AFt phases. Whereas the sequence of the dissolution reactions was relatively insensitive to the composition of the percolating water, the duration of the different reactions depends strongly on the percolating water composition. Major identified factors influencing the velocity of cement degradation are the effect of dry deposition and biological activity increasing the partial pressure of CO{sub 2(g)} in the soil air phase (and thus increasing the inorganic carbon content in the percolating water). Soil weathering processes have only a minor impact, at least for the relatively inert sandy material considered in this study.
- OSTI ID:
- 21483650
- Journal Information:
- Cement and Concrete Research, Vol. 40, Issue 8; Other Information: DOI: 10.1016/j.cemconres.2010.02.008; PII: S0008-8846(10)00045-1; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ATOMIC FORCE MICROSCOPY
BOUNDARY CONDITIONS
CALCIUM SILICATES
CARBON DIOXIDE
CEMENTS
CONCRETES
GEOCHEMISTRY
GROUND WATER
HYDRATES
LEACHING
PARTIAL PRESSURE
PERFORMANCE
POROUS MATERIALS
RADIOACTIVE WASTE MANAGEMENT
RAIN
SIMULATION
TEMPERATURE RANGE 0273-0400 K
THERMODYNAMIC MODEL
WATER
WEATHERING
ALKALINE EARTH METAL COMPOUNDS
ATMOSPHERIC PRECIPITATIONS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
DISSOLUTION
HYDROGEN COMPOUNDS
MANAGEMENT
MATERIALS
MATHEMATICAL MODELS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PARTICLE MODELS
PHYSICAL PROPERTIES
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
STATISTICAL MODELS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
WASTE MANAGEMENT