ABSTRACT
Since the increase in alkali-aggregate reaction problems in Japan, the interest of workers has been focused on the elucidation of the mechanisms of the inhibition of the ASR by fly ash, blast furnace slag and silica fume. The major results obtained between 1983 and 1988 in Japan are as follows:
(1) The enhancement of expansion in Beltane opal mortars containing silica fume is attributable to the delay in softening of the gels formed in the mortars4.
