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Environmentally friendly sound absorbing noise barrier made from concrete waste - further developments

Krezel, Zbigniew Adam and McManus, Kerry 2010, Environmentally friendly sound absorbing noise barrier made from concrete waste - further developments, International journal of pavement research and technology, vol. 3, no. 4, pp. 223-227.

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Title Environmentally friendly sound absorbing noise barrier made from concrete waste - further developments
Author(s) Krezel, Zbigniew Adam
McManus, Kerry
Journal name International journal of pavement research and technology
Volume number 3
Issue number 4
Start page 223
End page 227
Publisher Chinese Society of Pavement Engineering
Place of publication Suffolk, Va.
Publication date 2010-07
ISSN 1997-1400
Keyword(s) concrete waste
noise barrier
road traffic noise
Summary This paper reports on the second phase of a research project aimed at the development of an environmentally friendly noise barrier for urban freeways, also known as KMAK [1]. The concrete barrier, which has some unique capabilities to mitigate transportation noise, is made from recycled concrete (RC) aggregate and industrial by-products such as fly ash and reclaimed water. The current developmental work expands on a research project that resulted in a two-layer (2L) concrete barrier. Two prototypes of the 2L barrier were produced, followed by extensive acoustic testing and a number of simulations where standard timber and/or concrete barriers were substituted with KMAK barrier [2]. Current research investigates a variety of architectural finishes applied to the original KMAK barrier with the aim of improving its visual appearance and also fine-tuning its acoustic performance. The new three-layer (3L) barrier optimizes sound absorption in a frequency range characteristic similar to that of transportation noise, especially road traffic noise. Three major aspects related to the development of architectural finishes were considered; environmentally responsible materials, surface features, and production methods. The findings of the current investigation demonstrate that there is a positive correlation between surface features, percentage of perforation as well as depth of the architectural layer, and increased potential of the 3L barrier to mitigate transportation noise. On average, the addition of perforated architectural finish contributes to a 20% increase in sound absorption. The preliminary results also show that the sound absorbency of the 3L barrier can be better controlled and tuned to specific noise frequency than the 2L type. The visual appearance has been significantly improved with the addition of the architectural finish, which makes the barrier an attractive, feasible, and viable alternative to road barriers made from standard concrete or timber.
Language eng
Field of Research 090503 Construction Materials
091202 Composite and Hybrid Materials
120104 Architectural Science and Technology (incl Acoustics, Lighting, Structure and Ecologically Sustainable Design)
Socio Economic Objective 970112 Expanding Knowledge in Built Environment and Design
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Chinese Society of Pavement Engineering
Persistent URL http://hdl.handle.net/10536/DRO/DU:30033856

Document type: Journal Article
Collections: School of Architecture and Built Environment
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