EXPERIENCE WITH UNBOUND COARSE AGGREGATE ROADBASES IN BADEN-WURTTEMBERG

ERFAHRUNGEN MIT UNGEBUNDENEN SCHOTTERTRAGSCHICHTEN IN BADEN-WUERTTEMBERG

IN BADEN-WURTTEMBERG UNBOUND ROADBASES HAVE BEEN CONSTRUCTED OVER A VERY LONG PERIOD FROM LOCALLY OCCURRING SHELL AND JURASSIC LIMESTONES, WHICH SATISFY FEDERAL SPECIFICATIONS. IT WAS ANNOYING THAT, TO A VARYING DEGREE, UNSUITABLE MATERIAL HAD TO BE SORTED OUT AND EXCLUDED. NEITHER OF THE TWO TYPES OF STONE COULD, HOWEVER, COMPLY WITH THE HIGHEST LIMITS FOR FINE COMPONENTS OF CONCRETE ROADBASES INTRODUCED IN THE NINETEEN-SIXTIES. DUE TO THE SHORTAGE OF GRAVEL AND SAND THESE WERE LATER REPLACED TO AN INCREASING MEASURE BY LIMESTONE AGGREGATES. IT WAS SHOWN, HOWEVER, THAT THE REQUIRED MINIMAL THICKNESS OF THIS TYPE OF FROST BLANKET WAS NOT SUFFICIENTLY ROBUST IN BAD WEATHER TO CARRY CONSTRUCTION TRAFFIC. SINCE NO DAMAGE OCCURRED TO THICKER FROST PROTECTION LAYERS, A COMBINATION WAS INTRODUCED OF OVER 35 CM DEPTH OF FROST BLANKET AND ROADBASE. THE REQUIREMENTS OF ZTV-STB76 WERE FULFILLED AND CONSEQUENTLY ACHIEVEMENT OF THE STANDARD PAVING ACCORDING TO LOCAL CONDITIONS. A NUMBER OF EXAMPLES ARE PROVIDED.

Language

  • German

Media Info

  • Pagination: 15-20
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01288909
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 1:32AM