<p>I worked on high-performance concrete by partially replacing cement with metakaolin as per ASTM standards.<br>At 28 and 56 days, the compressive strength was higher compared to normal concrete.<br>It also improved durability by reducing permeability, chloride penetration, and sulfate attack.<br>Workability slightly decreased, but I managed it using superplasticizers.<br>Overall, the concrete showed better strength, durability, and long-term performance.&nbsp;</p>