Organic Low-Cost Anti-Algal Powder for Brickwork in Construction Projects

In construction projects, brickwork often remains exposed to rain and humidity before plastering, leading to moisture absorption and the growth of algae and fungi on wall surfaces. This biological growth affects the appearance of buildings and reduces the bond strength between brick and plaster, causing peeling, dampness, and surface deterioration. Conventional cleaning methods such as manual scrubbing and chemical treatments are time-consuming, expensive, and harmful to both workers and the environment. This study proposes the development of an organic low- cost anti-algal powder composed of hydrated lime, borax, neem powder, and fly ash. These materials were selected due to their antimicrobial properties, availability, and environmental safety. The powder is designed to be mixed with water to form a brushable solution that can be applied directly on algae-affected brick surfaces. Experimental testing was conducted on algae-grown brick samples to evaluate the cleaning efficiency of the developed formulation. The results showed that the unfiltered mixture achieved approximately 99% algae removal, while the filtered solution removed around 80% of algae. The treatment effectively cleaned the brick surface without causing structural damage and improved surface roughness beneficial for plaster adhesion. The study demonstrates that the developed organic powder can serve as a safe, eco-friendly, and economical alternative to chemical cleaning methods used in construction sites.