Freezing and Thawing Resistance of High Slag Content Concrete

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Title: Freezing and Thawing Resistance of High Slag Content Concrete

Author(s): J. Nakamoto, K, Togawa, T. Miyagawa, M. Fujii and S. Nagaoka

Publication: Special Publication

Volume: 179

Issue:

Appears on pages(s): 1059-1072

Keywords: blast furnace slag; compressive strength; durability; fineness; freeze thaw durability; slags

Date: 6/1/1998

Abstract:
It is essential that concrete structures should withstand the conditions for which it has been designed for long periods of time. The lack of durability may be caused either by the environment to which the concrete is exposed or by the concrete itself. In this study, the resistance to freezing and thawing of high-slag content concrete(HSC concrete), which is one of the external causes, have been discussed for the purpose of utilizing the ground granulated blast furnace slag (GGBS) as an ingredient of cement. The slag content in cement ranged from 0 to 9.5 % by weight of total cementitious materials and the fineness of slag was 816 m*/kg. The resistance of air entrained (AE) concrete with a slag content of 70% was superior or comparable to that of slag free concrete, whereas AE concretes have questionable performance in the case of slag content of 85%, and have less ability in the case of 95% slag content with respect to freezing and thawing resistance. HSC concretes could have satisfactory high resistance to freezing and thawing by using an air-entraining high range water-reducing admixture(AEHW admixture), even if the slag content was 95%. Then, the concretes with AEHW admixture, which is called SP concrete, would be recommended for freezing and thawing conditions with respect to the use of HSC concrete.