Abstract
Recently a method for the detection of alkali-silica reactivity of sand has been proposed. In this method sand is digested in a mixture of Ca(OH) 2 and saturated KCl for 24 hours. The OH ion concentration is determined by titration. The OH ion concentration for a control mixture without sand is determined and difference between control and sample OH ion concentration is termed δ. This δ is a measure of alkali-silica reactivity. The method has been tested by six different laboratories. The reproducibility of the method is fairly high. To determine an acceptance criterion, 16 Danish sand types have been tested and δ value compared with flint content and expansion. A δ value of 110 separates expanding and non-expanding Danish sand types.
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