Experimental study on the flexural strength of reinforced and revibrated RHA concrete beam.

Abstract

This paper presents an experimental study undertaken on the flexural strength of reinforced and re-vibrated concrete beams partially replaced with Rice Husk Ash (RHA) for cement at several percentages (0%, 5%, 10% and 15%, 20%) using concrete mix ratio of 1:2:4 with water - cement ratio of 0.5. Thirty five (35) numbers of beams were re-vibrated at 10 min intervals for one hour time lag for all percentage replacement level. Flexural test of these 35 beams specimen were carried out and the results are presented. Results show that the maximum flexural strength (10.7 N/mm2) was obtained at 5% replacement and at 20 min for re-vibration time-lag interval. It was also observed that the flexural strength of RHA concrete decreases from 30 min to 60 min for all replacements.