Abstract
A further hydration test was conducted to study the effects of temperature and humidity conditions on the compressive strength and microstructure of ultra-high performance concrete with coarse aggregates (UHPC-CA), while analyzing the mechanisms influencing its compressive strength. The results indicated that the higher temperatures resulted in more significant strength and pore structure variations, with strength and pore structure changes being greater in liquid water environments compared to water vapor environments. The hardness of interfacial transition zone (ITZ) increased initially and then declined. The influence of further hydration on the strength of UHPC-CA was primarily divided into three stages: enhancement, damage and filling. These findings provide a theoretical foundation for the evaluation and design of UHPC materials for long-term service in aquatic environments.
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