Design of New Process to Utilize Stubble Char for Constraction of M25 Concrete.

Considering the challenges posed by agricultural waste, specifically rice straw, this study focuses on implementing cost-effective and eco-friendly processes to transform rice straw waste intovaluable, high-demand materials (sodium carbonate and M-25 concrete). The analysis of rice straw reveals its primary composition of cellulose and sodium silicate, with a layered cellulose microstructure. To produce sodium carbonate, rice straw is subjected to incineration ina furnace, with the resulting effluent gas passing through aqueous NaOH to effectively capture CO2 at room temperature and ambient pressure. Simultaneously, the ash generated from burning rice straw is employed as a pozzolanic material in the production of M25 grade concrete. Notably, the concrete containing 20% ash demonstrates an impressive compressive strength of 29.05 MPa after a 28-day curing period. These results are highly promising for the potentialutilization of agricultural waste in the production of soda and concrete. [ABSTRACT FROM AUTHOR]