TheEffect of Pozzolans and Slags on the Sulfate Resistance of Hydraulic Cement Mortars


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Title: TheEffect of Pozzolans and Slags on the Sulfate Resistance of Hydraulic Cement Mortars

Author(s): G. Sam Wong and Toy S. Poole

Publication: Special Publication

Volume: 100


Appears on pages(s): 2121-2134

Keywords: blended cements; expansion; fly ash; mortars (material); portland cements; portland pozzolan cements; portland slag cements; sulfate resistance; Materials Research

Date: 4/1/1987

This paper reviews the sulfate resistance of mortars made using Type IP and IS cements and blends of portland cement and pozzolans produced in the U.S. during the late 1970s and 1980s. These data were obtained during the development of ASTM C 1012. Data were expressed as rates of expansion. Two analyses were performed. First, a comparative analysis of sulfate-resistance properties among the various cements was performed. Type IP cements were found to perform as well as Type II cements and, in some cases, as well as Type V cements. The performance of Type IS cements was variable. Pozzolans blended with portland cements generally improved resistance to sulfate attack, but with some cements, the improvement was not to the level of Type II cements. Second, the relationship between commonly measured properties of pozzolans and the effect these pozzolans have on the sulfate resistance of portland pozzolan cements was examined by multiple regression. Fineness (Blaine) of pozzolans was found to correlate strongly with rates of expansion in two cements which were highly susceptible to sulfate attack. When the same pozzolans were blended with another less reactive cement, the sulfate content of these pozzolans correlated with rates of expansion.