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Abstract
Based on the backgrounds of green development trend of ultra-high-performance concrete (UHPC)and low early
strength of low-heat cement (mainly belite phase), the strength and hydration microstructure of low heat cement UHPC and
Portland cement UHPC prepared under standard curing, steam curing and autoclave curing conditions were studied. The
results showed that the compressive strength and flexural strength of UHPC were lower than ordinary Portland cement after
1 day of standard curing, but which was higher than ordinary Portland cement at 28 days age and 90 days age. After thermal
curing, the mechanical strength of low heat cement UHPC is significantly improved, exceeding the ordinary Portland cement
UHPC. UHPC paste of low-heat cement has higher C-S-H content, lower CH content and higher density of matrix, which is
especially obvious after thermal curing. When autoclaved curing for 90 days, the maximum compressive strength of low heat
cement UHPC is 197.5 MPa.
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2023, Vol. 0 
