In a test section on a cantonal road in the Canton Aargau three to four section, each in a length of about 100 m, with different wearing course will be placed. The noise behaviour and the development of noise characteristics and quality will be observed during two years.
The crucial objective of the project is to test the noise behaviour of Gussasphalt, Mastix asphalt, porous asphalt and asphalt concrete in a full scale test section.
There are field tests and field measurements at different layers performed, among others, two layers of mastic asphalt, which has been previously trimmed to "noise optimised properties" in the laboratory.
Field studies on various deck coverings and mastic asphalt with "constructed surface"will be provided in the other phase of the project.
In high speed contests the experimental results show the advantages of the mastic asphalt against the concrete asphalt fields. In a test section in the Canton Aargau six sections, each in a length of about 100 m, with different wearing course were placed.
Road wearing courses can be optimised against noise using more adequate bituminous mixture recipes. This is particularly true for mastic asphalt, since its recipe allows for choosing different types of crushed stones in the mixture.
The field tests in the Aargau County represent an ideal opportunity for measuring the time dependent development of the noise characteristics for different pavements.
The experimental results for the measurement type "high speed" are analysed, since these data are of great relevance for this research project (A2 Highway in Uri County). The experimental results for the measuring types “highest peak”, “high speed” and “lightly averaged peak” allow for the following conclusions:
- The split mastic and asphalt concrete wearing courses are the most noisy
- The raw asphalt and the draining asphalt are the less noisy
- The mastic asphalt with added minerals for the grip show noise level between the ones of the two precedent materials
The noise behaviour and the development of noise characteristics and quality will be observed during two years.