Models of Transport Processes in Concrete

Technical Report · Tue Jan 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/6127638· OSTI ID:6127638

Pommersheim, J. M. ^[1]; Clifton, J. R. ^[2]

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1. Bucknell Univ., Lewisburg, PA (United States)
2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

An approach being considered by the US Nuclear Regulatory Commission for disposal of low-level radioactive waste is to place the waste forms in concrete vaults buried underground. The vaults would need a service life of 500 years. Approaches for predicting the service life of concrete of such vaults include the use of mathematical models. Mathematical models are presented in this report for the major degradation processes anticipated for the concrete vaults, which are corrosion of steel reinforcement, sulfate attack, acid attack, and leaching. The models mathematically represent rate controlling processes including diffusion, convection, and reaction and sorption of chemical species. These models can form the basis for predicting the life of concrete under in-service conditions.

• Research Organization: US Nuclear Regulatory Commission (NRC), Washington, DC (United States). Office of Nuclear Regulatory Research; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Bucknell Univ., Lewisburg, PA (United States)
• Sponsoring Organization: USNRC
• OSTI ID: 6127638
• Report Number(s): NUREG/CR--4269; NISTIR--4405; ON: TI91006816
• Country of Publication: United States
• Language: English

Related Subjects

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12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
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990200 -- Mathematics & Computers
ADSORPTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM SILICATES
CALCIUM SULFATES
CEMENTS
CHEMICAL REACTION KINETICS
CHLORIDES
CHLORINE COMPOUNDS
CONCRETES
CONVECTION
DIFFUSION
DISSOLUTION
ENERGY TRANSFER
ENVIRONMENTAL TRANSPORT
GYPSUM
HALIDES
HALOGEN COMPOUNDS
HEAT TRANSFER
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
LEACHING
LOW-LEVEL RADIOACTIVE WASTES
MANAGEMENT
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
MINERALS
OXYGEN COMPOUNDS
POROSITY
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTES
RADIONUCLIDE MIGRATION
REACTION KINETICS
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SORPTION
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES