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

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.



Swedish organisations in EU project on traffic safety and crash testing

Crash safety testing is one of the tools used to improve safety on roads. The EU is therefore funding a research project that started recently to develop virtual methods of crash testing. The long-term goal is to supplement the physical evaluation of crash...


International Conference on Electric Road Systems starts today

Electric Road Systems (ERS) is a relatively new concept with many initiatives on the way. To learn from each other and stimulate new collaborations the Swedish Research and Innovation Platform for Electric Roads arranged the first international conference...


Same survey of road users’ attitudes in 50 countries

At the Road Safety on Five Continents Conference, RS5C, one entire session presented a large survey of road users' attitudes in 38 countries. Results show large differences between countries in many areas, both regarding behavior and attitudes. A new survey...


Good results with alcohol interlock program according to Swedish study

An alcohol interlock program makes it possible for drink driving offenders to continue their everyday lives. In a Swedish study most of the participants were satisfied with the program and experienced improved health. They also reported drinking alcohol more...


Traffic safety in the spotlight

Today the Conference Road Safety on Five Continents (RS5C) opened in Jeju Island, South Korea. More than 220 participators have come from all over the world to present findings and learn about traffic safety. Dr. Young Tae Kim, Secretary-General of the...


VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...