Skillnader i vägens uppbyggnad i tvärled: en analys av parallell provtagning utmed tre äldre vägar

Johan Ullberg

For many years, reconstruction of roads has been built on the sampling of existing materials in the road structure. There are various methods to accomplish this, which means more or less damages in the road. From experience, we know that it may differ in material layer build up depending on where the roadbed samples are taken. Sides of the road may differ; slope and road surface often have different structure which makes it critical were sampling was done laterally in the road structure.

Efforts in a reconstruction is to obtain as similar final product as possible, i.e. about the same service life along the entire route. If you get significantly different results along the route it may result in maintenance operations must be carried out earlier or later than expected. Previously Scheduled actions can be if they are extensive clearly increase the cost of a LCC perspective (Life Cycle Cost), while oversizing on the other hand can result in increased costs in the construction phase. For Road Administration planning, it is important that the right action is taken. It must be a balance between representativeness, road safety and cost when selecting sampling method.

During three bearing capacity projects on existing roads in northern Sweden it has been sampled from both the road verge and the roadway. Sampling has been done to receive layer structure build-up from each sampling method on each section.

The purpose of the study is to examine whether there is a difference between the two sampling methods, and if there is a risk that the wrong reconstruction action is selected based on the results. The report presents results from sampling along three roads, road 779Andersfors–Storbrännan, 897 Ålund– Jakobsfors and 726 Bygdsiljum–Burträsk. The results have been analysed whether there are systematic differences or similarities between the location of sampling and how these are related to the Transport Administration's rules for sampling, as described in TDOK2014: 0151 "Sampling of unbound materials."



Cost Benefit Analysis (CBA) workshop in Stockholm

An open seminar and workshop in Stockholm will be held on 25-26 April 2018. The workshop deals with the use of CBA as a basis for decision-making in the public sector. The workshop is organized by, among others, Professor Jan-Eric Nilsson, VTI.

The 6st Humanist Conference

The 6th HUMANIST Conference will take place 13-14 June 2018 in the Hague, The Netherlands. The scope of the conference covers a wide range of topics on Human Factors in Transport. Tania Willstrand and Alexander Eriksson will present their research results.



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...


Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...


Swedish road safety spreads internationally

Sweden is a leading country in terms of road safety, and the research conducted by the Swedish National Road and Transport Research Institute (VTI) has contributed to increased safety. VTI’s remit includes disseminating research results and keeping up to date...


A greater understanding of cyclists' behaviour

Cyclists are often accused of not following traffic rules and being hooligans on the road. New research shows that there is no support for this perception. "Our observations reveal no such general anarchy" says Sonja Forward, researcher at VTI.


New technology for road surface measurement tested

VTI has tested a new scanning-laser technology for road surface measurement. The tests show the new technology for comprehensive transverse-profile measurement provides dependable values in measuring transverse profile and rut depth.


Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018

VTI’s Senior Research Leader Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018 for his work on research into tyres and road surface.