Abstract
Porous concrete (PC) is considered as an environmentally friendly pavement material due to its internal porosity. It has good functions such as: mitigate stormwater runoff, removal water pollutants, noise reduction, and mitigate urban heat island benefits. Many parameters have an effect on the sound reduction of PC, especially the porosity was often considered as the main factor affecting the sound absorption ability of PC. Therefore, thirty-six groups of porous concrete were selected to obtain different porosities of PC samples in this study. These groups include twelve kinds of aggregate gradation and three kinds of cement to aggregate (C/A) ratios. The selected concrete materials are mixed and cast on different thicknesses to study the influence of different mixtures on the sound absorption ability of PC using impedance tubes method with varied sound frequency (200 ~ 2000 Hz). In addition, the correlation between the sound absorption ability and the porosity of mixtures was investigated. The results show that the porosity, aggregate gradation, C/A ratio and pavement thickness have significant effects on the sound absorption performance for the examined PC mixtures.
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