Undersökning av mekanisk nedbrytning av obundna material vid tung trafik under byggnation av vägar

Undersökning av mekanisk nedbrytning av obundna material vid tung trafik under byggnation av vägar: HVS (Heavy Vehicle Simulator) tester av olika typer bergmaterial

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Karin Appelquist
Linus Brander

In Sweden the rock qualities are based on mechanical analyses such as the Studded Tyre Test, Microdeval and Los Angeles Tests. One of the issues in this project is whether these tests are sufficient to determine the rock quality. The Heavy Vehicle Simulator (HVS) is a vehicle simulator at full scale in which the degradation of a road can be accelerated; the road can be exposed to large well defined traffic loads during a short time. In this project, the degradation and rutting of unbound base course have been studied. The results show that: (i) No clear relationship between rocks with high LA values or high MDE values with rutting development. (ii) The mineralogy of the rock material affects the rutting development. (iii) There is some correlation between the degree of the crushing and LA value. (iv) Some crushing provides increased stability and less rut depth development of trafficked base layers.

The confirmed results are in contrast to the current practice in road construction in Sweden, which suggest that materials with low LA values give lower rutting than materials with high LA values. The tests are performed under dry conditions which gives that the tests are not considering the impact of moisture on rutting and deterioration mechanism.

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