TEMPERATURE EFFECTS ON GRADE 30 CONCRETE USING RESPONSE SURFACE METHODOLOGY

Abstract

This work tends to investigate the effects of mild temperature variations on the compressive strength of grade 30
concrete using response surface methodology. An experimental research design was adopted, which produced ninety
(90) concrete specimens. The specimens were exposed to temperatures of 25°C, 62.5°C, and 100°C for one (1) hour
in an electric furnace, after 28 days of curing. The optimum results show 11.8% and 12.1% increase of concrete
compressive strength at 62.5°C and 100°C when compared to the control’s compressive strength at 28 days curing
duration. The adjusted coefficient of determination (R2) was 0.1630 which means that the independent variable was
able to explain 16.30% of the residual compressive strength variation in the linear model.