MUMBAI, India, Jan. 9 -- Intellectual Property India has published a patent application (202521109801 A) filed by Visvesvaraya National Institute Of Technology, Nagpur, Maharashtra, on Nov. 11, 2025, for 'a method for preparing eco-friendly bottom ash bricks.'
Inventor(s) include Latkar, Madhuwanti Vinayak; Khare, Shubhangi Pradeep; and Junwale, Rishabh Deepak.
The application for the patent was published on Dec. 12, under issue no. 50/2025.
According to the abstract released by the Intellectual Property India: "The present invention relates to a method for preparing eco-friendly construction bricks using bottom ash (BA), a byproduct of coal combustion, in combination with Portland Pozzolana Cement (PPC) and manufactured sand (M-sand). The method employs enzyme induced calcium carbonate precipitation (EICCP) to enhance the mechanical and durability properties of BA bricks without the firing or compaction process. The optimal brick composition comprises 30% BA, 60% M-sand, and 10% cement. EICCP biocementing solution, prepared using 20 g/L soya bean hulls' powder as a urease enzyme source, 15 g/L urea as a substrate, and 39 g/L gypsum as a calcium source, is mixed with water and incorporated into the dry materials at a water/mix ratio of 0.15. The mixture is cast into molds and cured for 7, 14, and 28 days, inducing calcium carbonate precipitation within micropores, resulting in enhanced compressive strength (up to 13.2 MPa), reduced water absorption and improved ultrasonic pulse velocity (~3.4 km/s). The invention provides a sustainable, high-performance, and eco-friendly alternative to conventional construction bricks."
Disclaimer: Curated by HT Syndication.
