Byggnads- och underhållsmetoder för CBÖ-vägar

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Pavement structures with a cement-bound granular material (CBGM) road base and an asphalt wearing course are relatively rigid and suitable for roads with heavy traffic. The road pavement type known as cement bitumen pavement (CB) is common in many European countries and was previously also widely used in Sweden, but has been used very little here in recent years. One reason for this is that many roads have had problems with reflection cracks in the asphalt due to crack formation arising in the cement-bound granular material road base (CBGM). This crack formation consists mainly of thermal cracks that continue up though the asphalt layers. Crack formation in the cement-bound layers arises at different distances, with wider cracks at a distance of 15–20 metres, and it is these that continue up through the overlying asphalt layers.

This report examines seven well known road objects that have been paved with CB and that have been trafficked for between 2 and 30 years. Because the roads have different traffic loads, the thickness of the CBGM layer has varied from 160 mm to 240 mm. Depending on when the roads were built, they have been subject to different building requirements for CB. The strength requirement for CBGM has varied from 8.5 MPa to 17 MPa. The thickness of the asphalt binder course between CBGM and the asphalt wearing course has varied from 50 mm to 115 mm and the type of binder course has varied from bitumen stabilized gravel (BSG) to various types of softer or harder asphalt types, and overlying this there has always been a 40 mm asphalt wearing course.

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25-26
Apr

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.
13-14
Jun

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.

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