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This paper describes the influence of ground granulated blastfurnace slag (GGBS) on the durability of lime-stabilized kaolinite in 4·2% Na2SO4 solution. Sulphate durability was assessed in the laboratory by means of linear expansions measurements, microstructure and mineral phase analysis of compacted cylinders of the lime-stabilized kaolinite with different percentages of lime replacement by GGBS. The cylinders were immersed in 4·2% Na2SO4 solution and also in deionized water for various time periods. The exposure test data showed that the effect of GGBS on reducing expansion in 4·2% Na2SO4 solution is dramatic. The results also showed that high percentages of replacement of lime with slag (in particular 83%), with just enough lime to activate the slag, were the most effective in preventing sulphate solution attack.

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