Abstract
Improvements in the properties of portland cement concrete can be achieved through the use of mineral admixtures such as coal fly ash. One such improvement is the potential reduction of alkali-silica reactivity (asr), which causes an expansive reaction in certain aggregates and can lead to deterioration of the concrete. In sufficient amounts, fly ash may be used to inhibit asr. This paper appears in transportation research record no. 1301, Factors affecting propertiesand performance of pavements and bridges 1991.