Effects of Deicing Salt Trace Compounds on Deterioration of Portland Cement Concrete, HR-271, 1987

(1987) Effects of Deicing Salt Trace Compounds on Deterioration of Portland Cement Concrete, HR-271, 1987. Transportation, Department of

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Abstract

A study was made of the detrimental effects of trace amounts of calcium sulfate (occurring naturally in halite deposits used for deicing) on portland cement concrete pavements. It was found that sulfate introduced as gypsum with sodium chloride in deicing brines can have detrimental effects on portland cement mortar. Concentrations of sulfate as low as 0.5% of the solute rendered the brine destructive. Conditions of brine application were critical to specimen durability. The mechanisms of deterioration were found to be due to pore filling resulting from compound formation and deposition. A field evaluation of deteriorating joints suggests that the sulfate phenomena demonstrated in the laboratory also operates in the field. A preliminary evaluation was made of remedies: limits on sulfates, fly ash admixtures, treatment of existing pavement, and salt treatments. This report gives details of the research objectives, experimental design, field testing, and possible solutions. Recommendations for further study are presented.

Item Type: Departmental Report
Keywords: Admixtures, Applications, Brines, Calcium sulfates, Concrete pavements, Deicing chemicals, Deterioration, Field tests, Fly ash, Gypsum, Portland cement concrete, Sodium chloride, Trace elements
Subjects: Transportation > Pavements
Transportation > Pavements > Concrete
Transportation
Transportation > Roads and highways
Transportation > Research
ID Code: 16363
Deposited By: Iowa DOT Library
Deposited On: 14 Mar 2014 19:05
Last Modified: 05 Nov 2014 15:55
URI: http://publications.iowa.gov/id/eprint/16363