Abstract
In this paper, we will report the development of “ductile” high performance fly ash composites. These fly ash composites are made from 100% fly ash or with various amounts of chemical promoter (NaOH). An innovative process involving mixing, mechanical pressing and hydrothermal reaction is being developed. These three major steps follow a sequential order. After mixing, a fly ash mix is filled in the mold, then compressed by a press machine to specified pressures up to 20 MPa. After reaching specified pressure, the mold is heated to moderate temperatures up to 300°C and for a period of specified times, during which hydrothermal reaction develops and solidifies the samples. In addition, a small amount of short fibers is added to the mix to further increase the ductility and crack resistance of the high strength fly ash composites. Both Class C and Class F fly ash have been used in this study. The differences in the types of fly ash and optimal processing conditions (pressure, temperature and time) will be discussed, together with their mechanical performance.
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