Cloride ion diffusion in low water-to-solid cement pastes

Technical Report · Sat Jun 01 04:00:00 EDT 1991

OSTI ID:5620093

Clifton, J R; Knab, L I; Garboczi, E J ^[1]; Xiong, L X ^[2]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (USA)
2. Shanghai Research Inst., SH (China)

Diffusion coefficients of 0.3 water to solids ratio (w/s) hydrated portland cement paste specimens were measured using a conventional diffusion cell. Specimens were made from both ASTM Type 1 and Type 2 portland cements and blends containing mineral admixtures (fly ash, granulated blastfurnace slag, or silica fume). The average diffusion coefficient for the portland cement paste specimens was 14 {times} 10{sup {minus}13} m{sup 2}/s. The diffusion coefficients for the specimens containing mineral admixtures were such more variable than those for the portland cement paste specimens. A probable cause of the variability in the test results was the presence of cracks observed in the test specimens. The effects of the depth of concrete cover over reinforcing steel and of the chloride ion diffusion coefficient on the service life of reinforced concrete exposed to chloride ions were predicted based on a diffusion model. Based on the model, the effect of the cover was shown to be proportional to the square of the cover depth. 18 refs., 5 figs., 6 tabs.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Engineering; National Inst. of Standards and Technology, Gaithersburg, MD (USA)
• Sponsoring Organization: NRC; Nuclear Regulatory Commission, Washington, DC (USA)
• OSTI ID: 5620093
• Report Number(s): NUREG/CR-5727; NISTIR--4549; ON: TI91014873
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
42 ENGINEERING
420500 -- Engineering-- Materials Testing
AEROSOL WASTES
ALLOYS
ASHES
BUILDING MATERIALS
CEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
DIFFUSION
FLY ASH
HALIDES
HALOGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
LOW-LEVEL RADIOACTIVE WASTES
MANAGEMENT
MATERIALS
MATERIALS TESTING
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PORTLAND CEMENT
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTES
RESIDUES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SLAGS
STEELS
STRESSES
TESTING
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES