Enhancing the Microstructure and Sustainability of Ultra-High-Performance Concrete Using Ultrafine Calcium Carbonate and High-Volume Fly Ash under Different Curing Regimes

In current practice, the performance-based concrete mix (PBCM) approach has become quite popular because it enhances quality of materials that are fundamentally necessary for a particular situation. present study, experimental analysis is performed to determine optimal mechanical properties and microstructural characteristics sustainable development cost effectiveness. Specifically, mixture high-volume fly ash (FA) ultrafine calcium carbonate (UFCC) investigated as partial substitution cement. For optimizing concrete’s performance, various curing regimes applied evaluate best conditions obtaining ideal properties. The results show containing 10% UFCC with mean particle size 3.5 µm blended 40% FA yielded an enhancement 25% in compressive strength early age. Moreover, improved compactness refined interstitial transition zone (ITZ). However, effects different methods on were insignificant after 28 days.