A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Investigation of Shrinkage Compensating Cements
Types K, M, and S expansive cements were investigated for expansive capabilities as unrestrained mortars made with and without fly ash and calcium lignosulfonate and cured at 50, 73, and 90 deg F. Restrained cement-sand mortars were studied at 73 and 90 deg F. Rates of formation and amounts of ettringite were related to extent and time of expansion and setting characteristics. All 3 types of cements without addition of admixtures showed satisfactory expansive capability. Fly ash and lignosulfonate affected variously, and frequently adversely, the expansive behavior. The key to controlling abnormal setting and expansive characteristics of these cements appears to be the control of rate and amount of ettringite precipitation. A clue for improving setting characteristics of one of the cements is presented. (Author)
Investigation of Shrinkage Compensating Cements
Types K, M, and S expansive cements were investigated for expansive capabilities as unrestrained mortars made with and without fly ash and calcium lignosulfonate and cured at 50, 73, and 90 deg F. Restrained cement-sand mortars were studied at 73 and 90 deg F. Rates of formation and amounts of ettringite were related to extent and time of expansion and setting characteristics. All 3 types of cements without addition of admixtures showed satisfactory expansive capability. Fly ash and lignosulfonate affected variously, and frequently adversely, the expansive behavior. The key to controlling abnormal setting and expansive characteristics of these cements appears to be the control of rate and amount of ettringite precipitation. A clue for improving setting characteristics of one of the cements is presented. (Author)
Investigation of Shrinkage Compensating Cements
G. L. Kalousek (author)
1970
16 pages
Report
No indication
English
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