01024773

Component

A porous elastic road surface (PERS) is a pavement which main materials are rubber chip and polyurethane. Its acoustical absorption characteristics and flexibility makes it superior for noise reduction of highway compared to drainage asphalt pavement (DAP) . Since 1994 we have been engaged in research and development of PERS, and have verified its effect on noise reduction and its durability as pavement. In earlier research and development, for example using a test track, the difference in sound power level (Lw) of cars has been regarded as the noise reduction effect since it was not possible to measure the change in equivalent continuous A-weighted sound pressure level (Leq) for a series of vehicles on such a limited length of surface. As the result of a comparatively major test construction on a highway, we have measured the noise reduction effect of PERS as the difference in Leq. First, we measured the motor vehicle Lw and Leq on each section. However, we found that the neighbouring paved sections also influenced Leq. Next, we calculated Leq according to a highway traffic noise model, using the difference in Lw measured in the different paved sections. Since the calculated Leq corresponded approximately with the measured Leq, we could verify the validity of the measured Lw. We again calculated Leq, assuming that each pavement is infinitely long. Consequently, we have found that the noise reduction effect of drainage asphalt pavement was 5-6dB, whereas that of PERS was 7-9dB.

01020180

06-0135

English

25p

2006

Transportation Research Board 85th Annual Meeting

CD-ROM

Figures (11) ; References; Tables (3)

Pavement performance; Polyurethane resins; Sound level; Sound transmission; Traffic noise

Drainage asphalt pavement; Noise reduction; Porous elastic road surface; Rubber chips

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2006 Paper #06-0135

TRIS, TRB

Mar 3 2006 10:16AM