MUMBAI, India, Jan. 9 -- Intellectual Property India has published a patent application (202541133516 A) filed by National Institute Of Technology, Calicut, Kerala, on Dec. 30, 2025, for 'development of clay brick dust (cbd) blended ground granulated blast furnace slag (ggbs) based geopolymer concrete paving blocks.'
Inventor(s) include Mini Remanan; Abdu Salam Parapparakkal; Jaza Nellikurussi; Azeema Shanavas; and Gajavalli Durga Sai Bhargavi.
The application for the patent was published on Jan. 9, under issue no. 02/2026.
According to the abstract released by the Intellectual Property India: "A geopolymer concrete paving block for very heavy-traffic applications, comprising: a binder system consisting essentially of 90% by weight ground granulated blast furnace slag (GGBS) and 10% by weight clay brick dust (CBD), wherein said CBD is derived from pulverized construction and demolition waste clay bricks and has a particle size of less than 45 microns; an alkaline activator comprising sodium hydroxide at a molarity of 10 M and sodium silicate in a sodium hydroxide-to-sodium silicate weight ratio of 2.5; fine aggregates comprising river sand passing a 4.75 mm sieve; coarse aggregates having a nominal size of 12.5 mm; and potable water, wherein the solution-to-binder ratio is 0.6, and the paving block is cured at ambient temperature (20-35 C) to achieve a 28-day compressive strength of at least 59.125 MPa (M 55), a split tensile strength of at least 3.6 N/mm, a flexural strength of at least 6.05 N/mm, water absorption of less than 6% and dry abrasion resistance value less than 18,000 mm3 /5000 mm2 and wet abrasion value less than 20000 mm3 /5000 mm2 said paving block being cement-free and exhibiting a zig-zag interlocking geometry with a surface area of approximately 300 cm and thickness of 10 cm."
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