Design of Eco-Sustainable Self-Compacting Lime- Based Concretes with Pozzolanic and Hydraulic Additions for Structural Use

Abstract

This study investigates the development of eco-sustainable self-compacting concretes based on natural hydraulic lime, aiming to provide a viable structural alternative aligned with modern sustainability standards. The research addresses the growing need for high-performance lime- based binders by formulating concretes capable of meeting structural requirements while minimizing environmental impact. Particular emphasis is placed on the synergistic role of pozzolanic and hydraulic mineral additions, which are combined with natural hydraulic lime to enhance mechanical performance and durability. A carefully controlled mix design, based on an algebraic approach, ensures consistent self-compacting behavior and reliable structural properties. The resulting concretes exhibit compressive strengths exceeding 25 MPa, with peak values reaching 47.1 MPa. Additional key properties include an elastic modulus up to 36.9 GPa, flexural strength of 6.8 MPa, and specific fracture energy of 153 N/m. These results demonstrate the potential of lime- based concretes with pozzolanic and hydraulic additions for sustainable structural applications, offering a promising pathway for future advancements in eco-efficient construction materials.