Electric vehicles play an important role in reducing noise pollution in cities and roads around the world. Also the asphalt on which they circulate helps to make planet Earth more silent.
These are the so-called silent or sound-absorbing asphalts. Thanks to the advanced materials and techniques used in the construction of these stealth roads, the rolling sound of vehicles against the surface can be reduced up to 75%.
These asphalts, more technologically advanced than conventional ones, have a less rough and, therefore, less noisy surface when in contact with the rubber of the tires.
A magic component
Unlike lifelong roads, these silent asphalts are made of a compound of crushed rubber (from recycling used tires) and gravel. The microagglomerate of discontinuous granulation - this is the name of this material - extends in layers three centimeters thick and, thanks to the greater space between its pebbles, absorbs part of the noise (hence its name of sound absorber) generated by cars at its He passed.
According to the tests carried out by numerous experts, the sound-absorbing flooring is able to reduce the rolling sound up to 6 decibels (dBA), a figure that in acoustics translates to a decrease of up to a quarter of the initial noise.
Surprising but not new, since we are not talking about a recent innovation. Although you may not have known them until now, these asphalts with a silencer have long been stealthier the traffic of cities and roads. During the last years, its composition has improved and several cities in Europe have spread to places.
Such are silent asphalts, pavements that, with their retreaded pebbles, also contribute to more sustainable mobility.