This paper describes the effect of cement and fine aggregate replacement of fly ash on the fresh properties and compressive strength of concrete, aiming at developing low environmental-impact fly ash concrete. In addition, the environmental impact reduction effect, such as CO
2 emission and the reduction of aggregate used, was examined. The results showed that the use of fly ash deceases the breeding and length change of concrete compared with that without fly ash, that the strength development of fly ash concrete is equal or greater than that of concrete without fly ash depending on the water-binder ratio and age, and that the fly ash concrete reduces the environmental impact in the production.
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