AWAM International Conference on Civil Engineering 2019 (AICCE'19) - Nibong Tebal - Malaysia (2019-08-21)

Acoustical Properties of Porous Concrete Containing OPS and Vermiculite
Generally, porous concrete is suitable to be used as part of noise barrier to absorb sound energy from noise sources and converts it into heat within the void. This paper investigates porous concrete contain Oil palm shell waste (OPS) and vermiculite in order to enhance the acoustic properties of porous concrete. The objectives of the study were to obtained the optimum OPS replacement and to investigate effect of OPS and vermiculite on sound absorption coefficient (SAC). Initially three mixes were developed with control mix without OPS and mixtures proportion with 25% and 50% OPS replacement on course aggregate. It was obtained 25% OPS replacement was the optimum mix based on the compressive strength. Further, 10, 15 and 20% of vermiculite were added to the optimum mixture. The result showed that vermiculite causes the increase of porosity and change the acoustic performance. Vermiculite reduced SAC at 1000 Hz and increased SAC at 2000 Hz for all specimens. The SAC curve has two peaks with the highest occurs at the 1st peak at 400 Hz. The additional vermiculite did increase the NRC value of porous concrete up to 0.43.
Assoc. Prof. Zaiton Haron, Miss Zanariah Jahya, Dr. Khairulzan Yahya