Nabuuma, R., Tigalana, D. and Otim, D. 2023. Effect of Cow Dung Ash and Recycled Concrete Aggregates on the Mechanical and Physical Properties of Concrete: Central Composite Design (CCD) Optimisation. East African Journal of Engineering. 6, 1 (Nov. 2023), 167-187. DOI:https://doi.org/10.37284/eaje.6.1.1573.