SYMPOSIA PAPER Published: 01 November 2012
STP104439

Estimating Acoustic Performance Trends of Various Asphalt-Surface Mixtures Based on Field Measurement

Source

As one measure to reduce traffic noise, designing a noise-reducing (“quiet”) pavement surface has received increasing attention. For asphalt pavements, some existing asphalt mixtures have shown better noise-reducing capabilities than conventional dense-graded asphalt concrete (DGAC) pavements. To design a new asphalt mixture optimized for noise reduction, the acoustic performance of existing asphalt–surface mixtures needs to be evaluated and understood. For this purpose, a study was conducted to measure tire/pavement noise on a variety of asphalt pavements for four consecutive years. The tire/pavement noise was measured with an on-board sound-intensity (OBSI) method that was continuously improved during the study. Regression analysis was applied to determine the levels and increase rates of tire/pavement noise on four major asphalt mixtures, and the effects of mix design variables on tire/pavement noise. Results show that tire/pavement noise generally increases with pavement age on all types of asphalt pavements. For newly placed or overlaid pavements, open-graded or rubberized gap-graded mixtures exhibit lower noise levels than conventional dense-graded asphalt mixture. Open-graded asphalt mixtures can retain noise-reduction benefit for a longer period than gap-graded mixtures. Using rubberized binders in the open-graded mixtures can further reduce the noise-increase rate. Pavement surface permeability, macrotexture, and existing surface distresses may affect the tire/pavement noise level.

Author Information

Lu, Qing
Dept. of Civil and Environmental Engineering, Univ. of South Florida, Tampa, Florida, US
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Details
Developed by Committee: E17
Pages: 150–159
DOI: 10.1520/STP104439
ISBN-EB: 978-0-8031-7565-5
ISBN-13: 978-0-8031-7541-9