Evaluation of the Effects of Different Additives on Compressive Strength of Clay-based Concrete Admixtures

In this study, the effect of different additives on the compressive strength of clay-based concrete admixtures was evaluated using standard test methods such as slump test, concrete cube test, curing etc. It was observed that for control samples with no clay and high clay content at 7, 14, and 28 days, compressive strength were 21.05, 22.13, 30.62 and 13.57,14.26 21.49 N/mm2 respectively. For superplasticizer (conplast SP430), Hydrated Lime, Periwinkle shell ash and Rice husk ash at 7, 14 and 28 days at 10% each it compressive strength were (30.78, 33.48, 35.72), (23.36, 28.08,31.82), (22.11, 28.13, 29.30) and (25.47, 27.96, 29.46) N/mm2 respectively. From the results, superplasticizer (conplastSP430) at 10% yielded the highest amount of compressive strength of 30.78, 33.48, and 35.72 at 7, 14, and 28 days curing respectively. These suggest that additives can be utilized in concrete with high clay content to improved compressive strength within satisfactory levels.