Abstract
In this study, ultra high performance concrete (UHPC) was used to investigate the effect of UHPC and its precast product by the severe freeze-thaw testing. The UHPC to be used as a precast product material contains a large amount of cement and cementitious materials, a large amount of superplasticizer, and a very small amount of water. The UHPC mixes with eight different volumes of steel fibres were tested and evaluated to find the optimum quality of precast production. The results show that the mechanical properties of UHPC possess high strength, ductility, and bond stress. The results also indicate that most of UHPC specimens presented a steady decrease in compressive and flexural strength after freeze-thaw testing. The 2.5, 3.0 and 3.5% steel fibres by volume were chosen and used in UHPC precast products, after UHPC specimens were tested and finished on their performance evaluations. The results show that the loading capacity of UHPC precast products increased significantly after 600 free-thaw cycles. As a result of freeze-thaw resistance, the appropriate mixes of UHPC applied in the precast products have been obtained; it would provide a reference manufacturing for the UHPC products.
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