Abstract
Generally, porous concrete is a suitable noise barrier that absorbs sound energy from noise sources and converts it to heat within the voids. This paper investigated oil palm shell waste (OPS) and vermiculite in enhancing the acoustical properties of porous concrete. The objectives of the study were to obtain the optimum OPS replacement and investigate the effects of OPS and vermiculite on sound absorption coefficient (SAC). Initially, three mixtures were developed; a control mix without OPS and mixtures with proportions of 25 and 50% OPS replacement on coarse aggregate. Results indicated that 25% OPS replacement was the optimum mix based on the compressive strength. Furthermore, 10, 15 and 20% of vermiculite were added to the optimum mix. The results also showed that vermiculite caused an increase in porosity, which changed the acoustical performance. Vermiculite reduced SAC at 1000 Hz and increased SAC at 2000 Hz for all specimens. The SAC curve had two peaks with the highest occurring at the first peak at 400 Hz. The additional vermiculite did increase the NRC value of the porous concrete containing OPS up to 0.43.
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