Study of a Road Test Track With and Without Crumb Rubber. Solutions for Noise Pollution

End-of-life tires are waste materials that pollute landscapes when they are disposed of in tire dumps.However, its life cycle is not finished when they are scrapped.The rubber of end-of-life tires could be used for new purposes as construction material in road rehabilitation.A gap-graded mix characterization was carried out in this work by means of laboratory and field performance tests.The mixture has a high content of crumb rubber (CR) by weight of bitumen.Crumb Rubber was added to the binder by a wet process.Close proximity methodology has been used in in-situ characterization of the acoustic behaviour.Moreover, absorption and dynamic stiffness tests were also conducted to determine the noise generation mechanisms involved in noise.According to the results achieved, a reduction of the noise emitted by the tire/pavement interaction could be accomplished with the construction of roads with mixture with CR added by a wet process.In addition, this would result in a decrease of the amount of waste tires in landfills.