Development of Sustainable Concrete Paver Blocks Using Wood Ash and Coal Ash as Partial Replacement of Cement

Logesh S, Dr. Manju R

Abstract: The rapid growth of the construction industry has led to increased demand for cement, resulting in large-scale CO? emissions and environmental degradation. This study explores the potential of wood ash (WA) and coal ash (CA), two abundant industrial by-products, as supplementary cementitious materials for manufacturing M40-grade concrete paver blocks. Cement was partially replaced with WA and CA at proportions of 0%, 5%, 10%, 15%, and for CA, 20%. The mechanical properties-including compressive strength, water absorption, and flexural strength-were evaluated at 7, 21, and 28 days according to IS 516 (1959) and IS 15658 (2006). Results indicate that 10% replacement for both WA and CA provided optimum performance, achieving compressive strengths close to or higher than the control mix. The microstructural benefits of pozzolanic reactions were evident from reduced water absorption (<1.6%) and improved matrix densification. The findings confirm that WA and CA are viable alternatives to reduce cement consumption, minimize waste disposal, and support sustainable construction practices. The paper provides a comprehensive analysis, quantification of sustainability, and recommendations for industry adoption.

Keywords: wood ash utilization, coal ash concrete, sustainable construction, cement replacement materials, M40 paver performance

How to Cite?: Logesh S, Dr. Manju R, "Development of Sustainable Concrete Paver Blocks Using Wood Ash and Coal Ash as Partial Replacement of Cement", Volume 14 Issue 11, November 2025, International Journal of Science and Research (IJSR), Pages: 1686-1688, https://www.ijsr.net/getabstract.php?paperid=SR251124215408, DOI: https://dx.doi.org/10.21275/SR251124215408