SEM-Based Microstructural Analysis and Experimental Optimization of Sawdust Ash in Stabilized Lateritic Bricks (SLB).

Abstract:

This study examines the compressed lateritic brick stabilizer sawdust ash (SDA) optimization and microstructural evaluation. In the experiment, Response Surface Methodology's Box Behnken Design (BBD) was employed. Following air drying and pulverization, lateritic soil was combined with water, cement, and pozzolan (SDA). Pouring the slurry into a hydraulic brick moulder produced stabilized interlocking lateritic bricks. Compressive strength, water absorption, abrasion, impact, and sulphate attack were evaluated at 28, 56, 108, and 365 days for membrane-cured bricks. The microstructure of the bricks was also examined using a SEM. As curing ages progressed, SDA's increasing silica oxide content, calcium, alumina, and ferric oxides made it a superior pozzolan with improved compressive strength, resistance to water absorption, abrasion, impact, and sulphate. Based on optimization results, the following properties are obtained at 365 days: 5.186 N/mm² compressive strength, 6.106% water absorption, 4.067% abrasion resistance, 8.598% impact resistance, and 9.853% sulphate attack resistance: 4.571% SDA, 0.047% cement, and 25.00% water content. The optimal mix demonstrated durability by having a compressive strength that was higher than load-bearing brick standards and a decreased water absorption rate. Particle bonding, pore closure, and pozzolanic activity were all enhanced in SEM micrographs at optimal SDA levels. Based on the data, SDA can be a cost-effective and environmentally friendly stabilizing agent for waste management and construction.