Abstract
There are only a few reports that have been studied synthetically how to decrease the amount of CO_2 effectively regarding the utilization of coal ash. The purpose of this report is to make utilization-models based on the present situation of coal ash utilization and to try to evaluate the quantity of CO_2-emissions in each model. The results are as follows.: 1) In the case of making the best use of 'Fly ash-mixed-cement', the amount of 1.44 million t-CO_2 can be reduced and is about the same as 30% CO_2-reduction effect of the 'Blast furnace slag-mixed-cement'. 2) In the case of partly replacing the fine aggregates with fly ash, the amount of 0.4 million t-CO_2 can only be cut down. 3) In the case of utilizing the artificial aggregates and slag made of fly ash, a great deal of fly ash disposed as the wastes can be reduced. 4) It is confirmed that one of the most effective ways of fly ash utilization is to use fly ash for the base-concrete of wooden houses, as compared with using it for mass concrete in the reactor building of nuclear power plants.
