Acoustic performance of a noise barrier coated with an absorptive material

摘要

A noise barrier design of the absorptive type, incorporating LECA(R) a well know material used in civil engineering because of its above-average sound absorption characteristics, as a coating material, is presented. The performance of the barrier was tested experimentally, using in situ measurements at Highway A2 in Portugal, and theoretically with MicroBruit, a computer program for traffic noise prediction. In general, results indicate that absorptive noise barriers made from concrete and coated with LECA(R) yield results similar to those obtained with uncoated reflective barriers. (C) 2005 Institute of Noise Control Engineering.