Effects of using Cement-Bonded Particle Boards with a Composite Component in Terms of Acoustic Performance in Outdoor Noise Barriers

Abstract

Wood-cementcomposites are widely utilized in many countries for both interior and exteriorapplications because of their strength properties for building materials (e.g.,siding, roofing, cladding, fencing and sub-flooring) and for acousticproperties such as in highway sound barriers. These composites have uniqueadvantages over other conventional materials. Generally, these products combinethe good qualities of cement (relatively high resistance to water, fire fungus,and termite infestation coupled with good sound insulation) with those of wood(high strength to weight ratio and workability). Whilereflective products like concrete have been the traditional material foroutdoor noise barrier walls & enclosures, the advanced sound-absorptivematerials found in Cement-bonded particle board products present a much moreeffective abatement option. Products like concrete or brick simply bounce soundwaves off their surface in different directions. Cement-bonded particle boardproducts actually absorb or completely eliminate the sound waves that hit them,significantly reducing overall noise. In this paper, acoustic performance ofCement-Bonded Particle Boards for applications will be discusses in differentconstruction models. In this paper, sound transmission loss performance ofCement-Bonded Particle Board panels for especially noise barrier applications willbe discusses in different construction models. In this research, thegeneral form of the composite sound barrier panel is a sandwich panel type,there is one board at the front and one at the back and in between there is aninsulation layer. Thickness of the cement-bonded particle boards and insulationlayer were chosen according to model design. The analysis results show that thematerial derivative, density and layer thickness of the insulation layer to bepreferred in the sound barrier composite panel application are among the mainfactors directly affecting the Sound Reduction Index (Rw) performance of themodel design.