MUMBAI, India, Oct. 5 -- Intellectual Property India has published a patent application (202641116151 A) filed by A. Anil Kumar; Mr. Guguloth Sai Kumar; Dr. G. Vikas Paul; Mrs. Reshma Sulthana; Syed Riyazuddin; Farhan Quadri Bhati; Mohammed Sohail; and Syed Khaja Wajahath Ali on September 28, 2026, for A Sustainable Lightweight Concrete Composition Incorporating Waste Pumice Aggregate And A Method For Evaluating Its Mechanical And Durability Properties.
Inventors include A. Anil Kumar; Mr. Guguloth Sai Kumar; Dr. G. Vikas Paul; Mrs. Reshma Sulthana; Syed Riyazuddin; Farhan Quadri Bhati; Mohammed Sohail; and Syed Khaja Wajahath Ali.
The application for the patent was published on October 02, 2026, under issue no. 40/2026.
Abstract: ABSTRACT OF THE INVENTION The present invention provides a sustainable lightweight concrete composition incorporating waste pumice aggregate (WPA) as a partial replacement for conventional natural coarse aggregates, and a method for evaluating its mechanical and durability properties. The invention addresses the critical need for environmentally sustainable construction materials that maintain structural performance for M35 grade applications. The lightweight concrete composition comprises cement (OPC 53 grade), fine aggregate (Zone II sand), natural coarse aggregate (20 mm crushed stone), waste pumice aggregate, water, and superplasticizer. The waste pumice aggregate is incorporated at replacement levels ranging from 0% to 50% by volume of natural coarse aggregate, with 30% WPA replacement identified as optimal for balancing strength and weight reduction. The concrete composition is designed for M35 grade with a target mean strength of 43.25 MPa using IS 10262:2019 guidelines. The mix design for 30% WPA replacement comprises cement content of 450 kg/m³, water content of 208 kg/m³, fine aggregate content of 649 kg/m³, natural coarse aggregate content of 767.9 kg/m³, waste pumice aggregate content of 132 kg/m³, and superplasticizer content of 4.5 kg/m³. Laboratory testing demonstrates that compressive strength gradually decreases with increasing WPA content across all curing periods. The control mix (0% WPA) achieves the highest 28- day strength of 45.2 MPa. At 30% WPA replacement, the 28-day strength is 39.8 MPa, indicating a well-balanced mix for strength and weight reduction. Even at 50% WPA, the 28-day compressive strength remains above 35.6 MPa, satisfying the minimum requirement for M35 grade applications. The present invention offers significant advantages including reduced concrete density, lower self-weight of structures, cost savings in foundation and structural elements, improved thermal insulation properties, reduced carbon footprint, conservation of natural resources, and utilization of waste materials. The invention is particularly suitable for structural and non-structural applications in sustainable construction, contributing to green building practices and circular economy principles.
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