This paper reports the results of investigation on the effect of some likely aggressive media on the strength properties of concrete made with ordinary Portland cement (OPC) used in construction in Nigeria. Concrete cube specimens were prepared and subjected to Sea water, tannery waste effluent, and prepared NPK and Urea solutions. The samples were immersed in the media at immersion ages of 3, 7, 28 and 56 days. The results obtained showed that the ordinary Portland cement concrete is susceptible to different aggressiveness of the solutions of Sea Water, Tannery waste effluent, NPK and Urea solutions as they led to decrease in rates of compressive strength development of concrete specimens. Corrosion rate was highest in Sea Water (20%) and this is followed by Urea (18%), NPK (16%) and Tannery effluent (15%) reductions in strength respectively. It was also found that the entire media except the control medium led to decrease in strength of concrete specimens after two months of immersion.
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