Vibration-controlled stabilization of concrete slabs for durable asphalt overlays with anticracking layers

This project (1st August 2007 through 31st July 2010) was funded bij Flemish Agency for Innovation by Science and Technology (IWT), and was completed jointly by the University of Leuven (KUL) and BRRC. The experimental field research for this project was carried out for the greater part on regional road N9 between Ghent and Eeklo (Belgium).

The project comprised several research actions:

  • WP1: survey of the condition of the existing concrete road at the start of the project, while focussing on the characteristics of the concrete slabs and the subgrade (WP1.1) and the problems with vibrations (WP1.2). Measurements were made to assess load transfer between slabs (Faultimeter and FWD), to determine slab rocking (Faultimeter) and step faulting (topographic measurements), and to evaluate the stability of the underlying structure (FWD). Vibrations were determined from ground accelaration measurements during the passage of a lorry. The Structural Mechanics Section of the University of Leuven (KUL) developed a user-friendly computer programme for the prognosis of vibration annoyance from road traffic;
  • WP2: stabilization of concrete slabs. With under-slab injections (WP2.1), investigation of slab rocking (WP2.2), and the insertion of dowels (WP2.3). Three methods were investigated: cracking and seating of slabs, under-slab injections, and inserting dowels (see The stabilization of concrete slab roads). The Structural Mechanics Section of the University of Leuven developed a non-linear predictive model for the prognosis of vibrations induced by cracking and seating;
  • WP3: anticracking interlayers. The Asphalt Roads, Bituminous Applications and Chemistry Division of BRRC tested various types of anticraking interlayer for effectiveness, both in the laboratory and in test sections. New laboratory tests were developed as well (see Aphalt overlays with anticracking interlayers). Test sections with anticracking interlayers were constructed and subsequently monitored (see Asphalt overlays with anticracking interlayers);
  • WP4: optimization of asphalt overlays. Various types of asphalt were tested in the laboratory with a view to a comparative analysis of their resistance to reflective cracking. Improved mix designs were found for the surface layers;
  • WP5: dissemination of the knowledge gained from the project.

Related subjects and documents

Perez S., Beelden A., Maeck J., Van Geem C., Vanelstraete A., Degrande G., Lombaert G., De Winne P.,
Evaluation des stabilisations de dalles en béton au moyen du FWD et du faultimètre.
XXIe Congrès belge de la Route, ABR/AWV,Gand, 22-25 septembre 2009, Thème II «Revêtements en béton», 10 p.

Vanelstraete A., Maeck J., Beeldens A., Perez S., De Visscher J., Vervaecke F., Van Geem C. e.a.,
Stabilisation par vibrations contrôlées de dalles en béton pour des recouvrements bitumineux à interfaces antifissures durables.
XXIe Congrès belge de la Route, ABR/AWV,Gand, 22-25 septembre 2009, Thème I “Revêtements bitumineux”, 10 p.

Vanelstraete A., Beeldens A., De Visscher J., Lombaert G., Degrande G.
Stabilisation par vibrations contrôlées de dalles en béton pour des recouvrements bitumineux à interfaces antifissures durables.
Geotechniek, 16(2012)2, pp. 54-7, Rotterdam: Educom, 2012, 4 p.

Denolf K., De Visscher J., Vanelstraete A.,
Performance of anti-cracking interface systems on overlaid cement concrete slabs – development of laboratory test to simulate slab rocking
7th RILEM International Conference on Cracking in Pavements (Delft, 2012), p. 1169 12 p.