E20 Gothenburg, Sweden

Major carriageway refurbishment has been carried out to the E20 near Gotheburg, western Sweden, during June and July 2016. Asphalting took place in parallel across three lanes to speed surfacing works and minimise disruption to traffic.
NYNAS BITUMENNYPOL 67 AND 73
  • SITE TYPE Motorway
  • PRODUCT Nypol 67 and Nypol 73
  • EXTRA
  • HOT MIX APPLICATIONS

Nypol is a group of polymer modified binders that provide enhanced resistance to rutting, deformation, cracking and wear, making them ideal for surfaces that are subjected to heavy loads.

Background

Traffic on the E20 approaching Gothenburg from the west gets busier the nearer you get to the city. An average of 50,000 vehicles use this section every day, 10% consisting of heavy goods vehicles. The condition of certain sections of the road has worsened in recent years. This is partly due to a porous asphalt surfacing whose open structure can age more quickly because of exposure to water and air. The problems on the E20 were evident in particular along a 5km section of primarily three lane highway.

Solution

Aiming to achieve a long term solution, the Swedish Transport Administration decided to mill off the entire surface course of this section plus some of the underlying binder layer. A total review of the road’s geometry was conducted at the same time in order to correct lane gradients and adjust for subsidence.

A computer generated  model of the road was entered into the milling machine’s control equipment. By calculating the position of the machine using total stations, the milling depth could automatically be adjusted according to the model. The gradient between the lanes was thereby precisely secured, an essential prerequisite for use of a widened asphalt paver to lay two or more lanes simultaneously.

The whole section was refurbished in two layers because of the depth of the original material removed. Polymer modified binder (PMB) was used in both the binder layer (50 mm) and surface course (30 mm) to meet tough demands for stability and fatigue resistance. The choice of PMB – Nypol 67 and Nypol 73 from Nynas – means that the estimated lifespan of the refurbished carriageway has been increased compared with a conventional surfacing. A total of approximately 20,000t of polymer modified asphalt was used to complete the project.

Details

Roadworks and other disruption to the section of E20 being refurbished could have had an impact to varying degrees on other traffic in and around Gothenburg. Temporary lane changes were made at night time to minimise any restrictions to accessibility and also to increase employee safety; these changes were then reversed to ensure normal traffic running in the morning.

The minimum requirement from the client was that two lanes should be laid in parallel as it was deemed the tight schedule could not otherwise be met. In the event, the contractor chose to lay the three lanes simultaneously to speed the project and also earn a bonus. One widened paver was used to lay two lanes with a supplementary machine operated in tandem to lay the third lane. This had the added advantage of minimising the number of transverse and longitudinal joints in the carriageway surfacing.

LOCATION E20 Gothenburg, Sweden

ASSIGNMENT New binder and surface course 

CLIENT Swedish Transport Administration   

CONTRACTOR Svevia 

DATE Summer 2016