MEASURES TO INHIBIT ALKALI-DOLOMITE REACTION

The effectiveness of mineral admixtures, sulfoaluminate cement and sup ersulfated cement in reducing expansion due to alkali-dolomite reactio n were evaluated by concrete microbar expansion tests. Owing to the lo w pH value of pore solutions in sulfoaluminate and supersulfated cemen t concrete, reactive dolomitic aggregates were almost unattacked, thus no expansion was observed in these two concrete. Mineral admixtures, such as PFA, BFS and SF, were more or less effective in decreasing exp ansion of dolomitic aggregates. To prevent damage from alkali-dolomite reaction, a high volume of mineral admixtures must be incorporated in to low alkali Portland cement concrete.