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2-layer ZOAB, as it is called in Dutch, consists of two layers of the well-known porous asphalt. By laying two layers on top of each other, the road surface contains even more hollow spaces, which absorb noise. More hollow spaces mean more noise absorption.
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In IPG-Weg, this noise measure has been tested and found to be effective. The measure has now been approved for use, which means that 2-layer porous asphalt may be applied in the Netherlands. After 2-layer porous asphalt has been laid, noise production is reduced by roughly 6 decibels compared with non-porous asphalt. But the development of 2-layer porous asphalt must go on. IPG-Weg is investigating the possibilities of increasing the life of the product, among other things.
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