Acoustic Performance

Comprehensive Laboratory Testing for both acoustic and structural performance were carried out at the University of Auckland, New Zealand and Technical Research Centre The Helsinki, Finland Acoustics Laboratory. AIRBORNE SOUND INSULATION Permacrib Environmental Noise Barrier Systems are designed to provide adequate sound insulation so sound transmitted directly through the wall is not significant compared with the sound diffracted over the wall. (STC=30, RW=31) *1 According to pr EN 1793-1 and extrapolated based on results in laboratory test which indicate that compaction on infill does not reduce the absorption performance of Permacrib Environmental Noise Barriers over time. *2 According to pr EN 1793-2 and extrapolated based on laboratory results which indicate that compaction due to seismic activity and natural settling and accumulation of dust particles will cause the acoustic insulation properties of the wall to increase with time, (reference Marshall Day and Associates 1993) SOUND ABSORPTION Permacrib Environmental Noise Barrier Systems are designed to be effective as sound absorbing devices on the traffic side (noisy side of the wall) to reduce additional noise nuisance caused by reflected sound (NRC=0.8 dB). Circumstances in which this treatment may be needed include; - noise barriers, rocks, or retaining walls that can reflect sound rays toward the unprotected areas; - vertical cuttings or where reflective surfaces face each other; - Tunnels and their approaches; - Traffic passing close to a barrier where reflection between vehicles & the barrier may reduce effectiveness. Home | Contact Us | Timber Crib Retaining Walls | Timber Crib Design/Construct Package | Noise Barriers | Noise Barriers Acoustic Performance | Soil Panel | Soil Panel Design/Construct Package | Latest Project Examples Copyright © 2002 Phi Group NZ Limited