The demand for electricity in Israel is growing exponentially and is increa
singly based on power generated from coal. Current means of ash disposal ar
e both inadequate and wasteful and have reached their maximum potential, th
us future ash disposal presents considerable economic and environmental pro
blems. Two representative samples of coal fly ash from Israeli power plants
were examined for their mineralogical, chemical, physical and technical pr
operties. Both samples are good-quality type F Ay ashes (ASTM nomenclature)
with excellent pozzolanic characteristics. On the basis of strength index
data, the South African fly ash was found to be a better pozzolan than the
Colombian. A simple beneficiation process is suggested to produce a high-qu
ality, reproducible and valuable raw material. Some specific uses for fly a
sh in the Israel context are suggested. (C) 1998 Elsevier Science Ltd. All
rights reserved.