Effect of Gypsum Content in Cement on Autogenous Shrinkage of Portland Blast-Furnace Slag Cement Concrete

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Title: Effect of Gypsum Content in Cement on Autogenous Shrinkage of Portland Blast-Furnace Slag Cement Concrete

Author(s): H. Tsuruta, H. Matsushita, K. Harada, and T. Goto

Publication: Special Publication

Volume: 221

Issue:

Appears on pages(s): 683-702

Keywords: autogenous shrinkage strain; degree of slag hydration; gypsum content; thermal expansion strain; transition from ettringite to monosulfate

Date: 5/1/2004

Abstract:
When low-heat portland blast-furnace slag cement is used, the thermal expansion strain of concrete shows reversal deformation in spite of the continuous temperature rising as the result of rapid autogenous shrinkage greater than the thermal expansion. In this study, the autogenous shrinkage strain was investigated in terms of gypsum con-tent in cement. It was possible to reduce the autogenous shrinkage by increasing the gypsum content in cement. Prevention of the early-age rapid hydration development of granulated blast-furnace slag at high temperature was also examined. Moreover, the amount of transition from ettringite to monosulfate of hydration product was deter-mined. As the result, it affected autogenous shrinkage of blast-fumace slag cement concrete significantly.