Ålegårdens forlængelse, Kolding DENMARK – 1989
01-007-A – pag 2/3
Problem Bad subsoil under the planned extension of the street, parallel to the Kolding-Å river.
Cubic Area: 2,300 m3. Load: ADT = approx. 30,000 vehicles/day. ADTT = approx. 3,000 vehicles/day
Composition Road bed 4 cm wearing course; 7 cm binder course; 20 cm bound base course; 40 cm unbound base course. Base Leca® 10-20 mm, thickness ~1.5m; Completely wrapped in geotextile; Flank cover 80 cm. Subsoil Bad subsoil (no details known).
Depiction of the street cross-section.
Building method Partial soil replacement 1. Excavation of surrounding earth to intended height; 2. Laying of the geotextile; 3. Application and spreading of the Leca® fill with a digger on caterpillar tracks in layers of up to 1 m; 4. Compaction with bulldozer or vibroplate (3-4 passes); 5. Wrap and cover Leca® with geotextile to protect it from infiltration by the surrounding earth; 6. Construction of the road bed. Application of the Leca® fill.
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Quality control Checks. –› Modulus of elasticity = 30-40 MPa.
Performance Measurements Topographical levelling at six double points during the first 3 years. –› maximum settlements of 1 to 2 cm.
Extensive repair areas.
Flaws/damage Type: depressions, cracks in the road surface. Time: no data. Visual appraisal as of 05.06.2004 Deformations lengthways: - a number of clearly visible depressions of up to around 5 cm crossways: - a number of small depressions, potholes around 1-3 cm deep - grooves in front of the traffic light very clear, around 3-5 cm - 5 cm application of asphalt, visible at drain inlet Transitional/contact areas Numerous cracks, transition not clearly detectable. Road surface Numerous cracks, mostly lengthways; Many shallow asphalt replacements.
Maintenance work Probably frequent and extensive.
Appraisal/Experiences Road probably too low over Leca® fill for the heavy load selected; Possibly shoddy work during application and compaction of the Leca®.
Cracks predominantly lengthways.
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