Abstract
This paper examines the effect of curing age and type on compressive strength of blended non-proprietary ultra-high-performance concrete (UHPC). Eleven plain UHPCs were batched using a constant water to-cementitious materials ratio of 0.21 and an aggregate-to-cementitious materials ratio of 1.20. Four binary, four ternary, and two quaternary blend cementitious materials combinations using Class F fly ash, slag, natural pozzolan, and silica fume, as a partial replacement of Portland cement, were compared with the UHPC made using 100% Portland cement. The findings revealed that, when the UHPCs were moist cured, the ternary blend containing 15% fly ash and 5% silica fume, as a partial substitute of Portland cement, displayed the highest compressive strength at all testing ages. Under moist curing conditions, quaternary blended UHPC containing 20% fly ash, 20% natural pozzolan, and 10% silica fume showed the highest increase in strength once curing age was extended from 90 to 365 days. Most of the UHPCs specimen cured for 7 days in 90°C environment showed superior to similar strength to that of the companion 28-day moist-cured UHPCs.
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