United States Department of Transportation
i
Controlling Sulfate Attack in Mississippi Department of Transportation Structures [2009-03]
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2009-03-31
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[PDF-2.31 MB]
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OCLC Number:665731665
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
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Abstract:At some construction sites in Mississippi, deterioration of con¬crete in contact with the surrounding soil could be related to the high sul¬fate content of the adjacent soils. Studies dating to 1966 have documented sulfate attack associated with specific types of sulfide or sulfate-rich soils. Future highway-related construction must include specified procedures and materials that will ensure the service life of concrete construction is not reduced by such aggressive soils.
In this project, three portland cements and five pozzolans, which can be used as cement replacements, were investigated to determine which of these cements and/or cement blends could be categorized as sulfate-resistant. Two screening procedures, the University of California Pavement Research Center’s Caltrans rapid sulfate test and the American Society for Testing and Materials’ Standard C1012 (standard test method for length change), were used to evaluate the cements/blended cements. Results from the Caltrans test identified only one of the blended cements investi¬gated that failed to qualify as sulfate resistant. The results from the bar expansion test (ASTM C1012) indicated that only one cement evaluated would not meet the criterion for an American Concrete Institute (ACI) Class 1 sulfate-resistant cement.
Further screening was done by examining the expansion trends and the conditions of the test bars after 1 year. Eight cements or blended cements could be judged on the basis of no or slow tendency to show change dimen¬¬sions and no discernible damage to the mortar test bars after 1 year of exposure. All of the cements performed well in this test program when blended with silica fume.
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