Abstract: This study assessed the durability of cowbones-ash blended cement concrete in aggressive environment. The experimentations covered the; production of cowbone ash (CBA) from waste cowbones, physical and chemical characterisation of the cowbone ash and the production of cowbone ash blended cement concrete (CBABC) mixes containing; 0%, 10%, 20% and 30% CBA as partial replacement of cement. Uniform water to binder ratio of 0.50 along with concrete mix ratio 1:2:4 was adopted. The CBABC cubic specimen of sizes 100mm by 100mm by 100mm were exposed to aggressive and non-aggressive conditions. The specimens were tested for compressive strength after 28 days curing duration.