DOI: 10.36347/sjet

Pages: 129-133

This paper presents the findings of an investigation on the resistance of Groundnut Shell Ash (GSA)-Rice Husk Ash (RHA) modified concrete to hydrochloric acid aggression and a regression model of the concrete resistance to hydrochloric acid environment. The GSA and RHA used were obtained by controlled burning of groundnut shell and rice husk, respectively in a kiln to a temperature of 600 oC, and after allowing cooling, sieved through sieve 75 µm and characterized. A total of fifteen 100 mm cubes of GSA-RHA-Concrete grade 20 mixes at replacement levels of 0, 10, 20, 30 and 40 %, respectively by weight of cement were cast, cured in water for 28 days and exposed to attack from 10 % concentration of diluted solution of hydrochloric acid (HCl) and the concrete resistance was also modeled using Minitab statistical software to establish regression model. The results of the investigations showed that the resistance of OPC concrete against HCl aggression was better than that of blended GSA-RHA concrete. The weight loss of OPC concrete after 28 days of exposure was 18.5 % as opposed to an average loss of 36.8 % for GSA-RHA concrete. The regression model of GSA-RHA-Concrete resistance against hydrochloric acid was developed with R2 value of 0.683 and was adequate for prediction of the sensitivities of pozzolanic activity of GSA-RHA in hydrochloric acid environment