Abstract
Abstract The objective of this study was to evaluate ultra high performance concrete (UHPC) as a precast product material containing portland type II cement, quartz powder, silica fume, silica sand, steel fiber, superplasticizer, water, and a specific amount of incinerator fly ash (IFA). The UHPC mixes containing different volumes of IFA were evaluated to find the optimum quality of precast production, while 2.5 % of steel fiber by volume was blended at every mix. The results indicate that the properties of UHPC exhibit high strength, ductility, and bonding stress. The compressive strength of UHPC decreases greatly as IFA for part replacement of cement or quartz powder increases. However, the flexural strength of UHPC decreases a little as IFA for part replacement of quartz powder increases. The results demonstrate that the UHPC products with 10 % or 15 % IFA were able to withstand a 98-kN proof load to the cover and frame without cracks or permanent deformation. It has to be noted that heavy metals that originated in the IFA are confined in the UHPC matrix and yield rather low leachability results.
Published Version
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