Abstract
The scope of this investigation is to develop a material mainly composed (80% w/w) of ceramic wastes that can be applied in the manufacture of road traffic noise reducing devices. The characterization of the product has been carried out attending to its acoustic, physical and mechanical properties, by measuring the sound absorption coefficient at normal incidence, the open void ratio, density and compressive strength. Since the sound absorbing behavior of a porous material is related to the size of the pores and the thickness of the specimen tested, the influence of the particle grain size of the ceramic waste and the thickness of the samples tested on the properties of the final product has been analyzed. The results obtained have been compared to a porous concrete made of crushed granite aggregate as a reference commercial material traditionally used in similar applications. Compositions with coarse particles showed greater sound absorption properties than compositions made with finer particles, besides presenting better sound absorption behavior than the reference porous concrete. Therefore, a ceramic waste-based porous concrete can be potentially recycled in the highway noise barriers field.
Highlights
The scope of this investigation is to develop a material mainly composed (80% w/w) of ceramic wastes that can be applied in the manufacture of road traffic noise reducing devices
In order to analyze the influence of the particle grain size of the ceramic waste in the properties of the final product, specimens with different grain size of CW were manufactured
The properties of the CW products have been compared to a typical porous concrete (HP) [20]
Summary
The scope of this investigation is to develop a material mainly composed (80% w/w) of ceramic wastes that can be applied in the manufacture of road traffic noise reducing devices. The reutilization of ceramic waste as fine and coarse aggregates in the concrete production has been previously studied [4,5,6,7], its use in structural concrete is not a common practice, as fine aggregates [8]. It seems that the best engineering applications found for recycling ceramic waste is as in non-structural concretes as recycled aggregates. Another increasing environmental problem is the noise pollution. Changes in the regulations have led to the creation of programs under the European Directive on the Assessment and Management of Environmental Noise [9], which are likely to lead to growth in the use of noise barriers as a way of reducing traffic noise
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