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Title: DEVELOPMENT OF HIGH-PERFORMANCE CONCRETE (M70) WITH PARTIAL CEMENT REPLACEMENT USING MARBLE DUST

Authors: Mr. Ruchit Patel

Abstract: The development of high-performance concrete (HPC) has emerged as a key area of research in the construction industry due to its superior strength, durability, and sustainability. This study investigates the production of M70-grade high-performance concrete with partial replacement of cement by marble dust, a byproduct of the marble industry. The primary objectives are to evaluate the feasibility of utilizing marble dust as a supplementary cementitious material and to assess its impact on the mechanical and durability properties of HPC.

The experimental program involved replacing cement with marble dust in varying proportions (0%, 10%, 15%, and 20% by weight) and optimizing the mix design to achieve the desired properties. Key parameters such as compressive strength, split tensile strength, flexural strength, and workability were analyzed. Durability tests, including water absorption, chloride penetration, and resistance to acid attack, were conducted to assess the performance of the modified concrete under harsh environmental conditions.

The results indicated that replacing cement with up to 15% marble dust enhanced the compressive strength, achieving values above 70 MPa at 28 days, while maintaining good workability. Durability properties were also improved due to the refined microstructure and reduced permeability. Beyond 15% replacement, the strength and durability properties declined due to excessive dilution of the cement matrix.

This research highlights the potential of marble dust as a sustainable and cost-effective alternative to cement in the production of HPC. By reducing cement consumption and reusing industrial waste, this approach contributes to environmental sustainability and promotes circular economy practices in the construction industry.

Keywords: Cement (53 grade), Marble powder, Fine aggregate (M-sand), Coarse aggregate (20mm size)