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The growing shortage of quality aggregates and the trend toward higher alkali levels in portland cement has increased the risk of problems associated with alkali-aggregate reactivity (AAR). The use of ground granulated blast furnace slag as a partial replacement for portland cement is a recognized remedial alternative in cases where a potential for AAR exists.
This report reviews available literature dealing with the influence of ground granulated blast furnace slag on AAR. In general, it was concluded that when the binder consists of 50% or more of ground vitreous slag, an alkali content of up to 1.00% as sodium oxide (Na2O) equivalents can be tolerated without a risk of problems. Improved resistance to AAR was provided from slags ground to higher fineness.
Several theories, promulgated to explain the mechanism for enhanced resistance to alkali reaction, are also reviewed.
Technical manager, Atlantic, Blue Circle, Ravena, NY
Stock #: CCA10377J