A CASE-STUDY OF 2 AIRPORT-RUNWAYS AFFECTED BY ALKALI-CARBONATE REACTION .1. EVIDENCE OF DETERIORATION AND EVALUATION OF AGGREGATES

Through the inspection of field concrete and detailed petrographic exa minations of concrete cores collected from two airport runways, it was found that the main reason of the damages in the concrete structures was alkali-carbonate reaction. The test results of the newly developed autoclave method agreed well with the field performance of the aggreg ates used. It is suggested that the autoclave method is an effective m ethod to evaluate the reactivity of carbonate aggregates though its ge neral validity should be widely inspected. (C) 1997 Elsevier Science L td.