Improvement of the mechanical properties of concrete by the addition of Metakaolin and rice husk hydrolyzed using a new method

Researchers are continually exploring materials to enhance concrete properties, reduce costs, and mitigate environmental impact. This study investigates the incorporation of rice husk subjected to dilute acid hydrolysis as a concrete additive, employing an innovative chemical method distinct from prior approaches. During acid hydrolysis, the acid catalyzed the breakdown of rice husk bonds, resulting in their shortened structure. When combined with metakaolin, this hydrolyzed rice husk exhibited remarkable improvements in adhesion, strength, and concrete weight reduction. Without metakaolin, concrete strength declined; however, their synergistic use significantly enhanced mechanical properties, elevating compressive strength by up to 16% and tensile strength by up to 9%. Furthermore, this combination reduced concrete weight and hydration temperature during concreting by 10% and 19%, respectively. The study also identifies the optimal additive percentage among those tested, providing valuable insights for concrete production and structural applications. The proposed blend of metakaolin and hydrolyzed rice husk emerges as a promising approach with potential benefits for concrete manufacturing and construction projects.