Statistical modelling of compressive strength of ordinary Portland cement concrete with rice Husk Ash

Abstract

ABSTRACT The study aimed at developing a model function to analyse the statistical data of the compressive strength of an ordinary Portland cement concrete with 15% replacement of cement with RHA. A total of twenty (20) concrete cubes were produced and cured for 28 days and the compressive strengths were plotted against cube weights. Regression analysis was then used to analyse the experimental values. R2 values between 31-44% were recorded from the different models. It was observed that the polynomial function has the highest coefficient of determination to the experimental values. The linear function shows the least statistical values of 1.39 for standard deviation and 0.15 for coefficient of correlation. The mathematical models developed are in conformity with experimental values with minimal variability.