Effect of Blast Furnace Slag in Reducing Expansion Due to Alkali-Silica Reaction in Concrete


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Title: Effect of Blast Furnace Slag in Reducing Expansion Due to Alkali-Silica Reaction in Concrete

Author(s): T. Wang

Publication: Special Publication

Volume: 153


Appears on pages(s): 1069-1086

Keywords: aggregates; alkali content; alkali-aggregate reactions; expansion; blast furnace slag; cement aggregate reactions; crack width and spacing; modulus of elasticity; slags; Materials Research

Date: 6/1/1995

In Japan, the use of blast furnace slag is a specified measure for reducing alkali-silica reaction (ASR) expansion in concrete. Most of the studies on the effect of blast furnace slag on reducing ASR expansion have been carried out with mortar tests; few studies have been carried out on the relationship between expansions in mortar and concrete. The studies on concrete containing different contents of reactive aggregate and blast furnace slag have been very limited. A proper method for estimating the effect of slag on reducing expansion has not been established. In this study, the expansion characteristics of mortar made using reactive aggregate and slag cement and the effect of replacement of portland cement by slag to reduce the expansion of concrete due to ASR were investigated. The effect of blast furnace slag for reducing expansion due to ASR is described from the viewpoint of dilution, stabilization, and immobilization of alkali. The pessimum conditions of expansion in concrete containing different reactive aggregate contents were studied. The expansion of concrete with 100 percent reactive fine aggregate was the largest. In addition, in the concrete with 100 percent reactive coarse aggregate and 50 percent slag, the limit value of total alkali content was estimated, as 8.0 kg/m 3 without considering the alkali content in slag, and as 9.0 kg/m 3 when the alkali content in slag is taken into consideration.