Prov med olika överbyggnadstyper - VTI

Long-term performance study of different pavement structures. A ten year study
of flexible, semi-rigid and rigid pavement structures, 1996–2006
by Leif G Wiman, Håkan Carlsson, Leif Viman and Bengt-Åke Hultqvist
VTI (Swedish National Road and Transport Research Institute)
SE-581 95 Linköping Sweden
Summary
In connection with the construction of a new part of the European road 6 (E6) close to
the city of Halmstad, (section Fastarp–Heberg), the Swedish Road Administration
decided to investigate the long-term behaviour of different types of pavement structures.
VTI got the mission to make documentation during the construction and to follow-up
the performance of these pavement structures on selected sections. The total length of
this new road was 21 km and 1/3 was constructed with flexible pavement structures and
2/3 with rigid pavement structures (cement concrete). The road section was opened to
traffic in the autumn 1996.
The main objective of the study is to investigate the pavements resistance to rutting,
both regarding wear from studded tires and deformation from heavy traffic. The
objective is also to study surface characteristics, such as evenness, friction and noise.
This report includes results and analyses from the first ten years of the study (1996–
2006).
In summary the conclusions so far are as follows:
• Performance based specifications clearly improved the deformation
properties of the bitumen bound layers.
• Semi-rigid pavement structures showed good resistance to rutting.
• Investigation is needed to improve the resistance to reflective cracking of the
semi-rigid structures.
• The vertical position of the steel net in reinforced flexible structures is
important. A position below a thin wearing course (40 mm) can not be
recommended according to this study.
• More than half of the surface rutting on the flexible structures could be
referred to deformation from the heavy traffic and a great deal of the
deformation occurred after the first year.
• Rigid pavement sections showed good wear resistance.
• The difference in surface friction and noise was small between flexible and
rigid pavement sections, however, regarding noise, it was only followed-up
during the first three years of the study.
VTI rapport 632 11