Performance Evaluation of Concrete with Cow Dung Ash and Rice Husk Ash as Cement Replacement.

This study investigates the use of Cow Dung Ash (CDA) and Rice Husk Ash (RHA) as partial cement replacements in M20 concrete. Experimental results indicate that optimum replacement at 2.5–5% (combined CDA+RHA) improves compressive strength at 28 days. Workability decreases with increasing replacement. The study confirms the potential of CDA and RHA as sustainable materials in concrete production.