Issuu on Google+

Ålegårdens forlængelse, Kolding DENMARK – 1989

Roads (01-007-A)


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).

Construction

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.

construction is


01-007-A – pag 3/3

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.

www.maxit-group.com maxitGroup AB, Box 415, SE-191 24 Sollentuna, Sweden Tel.: +46 (0)8 858 70 64 00, E-mail: info@maxit-group.com

construction is


1.007 - Denmark - Kolding - 1989