FLEXIBLE ROAD CONSTRUCTION IN GERMANY

FULLY FLEXIBLE CONSTRUCTION IN GERMANY IS GAINING RAPID HEADWAY AND IT IS CLAIMED THAT SOME 36 PER CENT OF NEW CONSTRUCTION IS IN THIS FORM. NORMAL CONSTRUCTION OF A FLEXIBLE CARRIAGEWAY IS TO HAVE 18CM OF BITUMEN BASE, 8.5 CM OF A BINDER COURSE AND 3.5 CM GUSSASPHALT. EXPERIMENTS ARE TAKING PLACE IN AN ENDEAVOR TO PROVIDE A MORE ECONOMIC METHOD OF INSULATING THE SUB-GRADE. ONE EXPERIMENT USED AN INSULATOR WHICH CONSISTED OF BAKED CLAY COATED WITH 20 PER CENT OF BITUMEN. THE MATERIAL HAD A SPECIFIC GRAVITY OF ABOUT 1.2. THIS LAYER COULD BE USED TO A DEPTH OF 10 CM INSTEAD OF THE DESIGNED THICKNESS OF A FROST FREE LAYER OF 50 CM. IN GERMANY IT IS NORMAL FOR HIGH SPEED ROUTES TO BE SURFACED WITH ASPHALTIC CONCRETE OR GUSSASPHALT AND THE LATTER IS GAINING IN FAVOR BECAUSE IT IS CLAIMED THAT A SURFACING CONTRACTOR CAN GAIN AN ADDITIONAL TWO MONTHS LAYING DURING THE YEAR, DUE PRINCIPALLY TO THE FACT THAT GUSSASPHALT IS CAPABLE OF BEING LAID AT TEMPERATURES DOWN TO MINUS 4 DEGREES C. THE REASON FOR THIS IS THAT NO CONSOLIDATION OF THE MIX IS REQUIRED AS IT IS FED INTO STIRRER POTS MOUNTED ON VEHICLES AND THE GUSSASPHALT IS POURED DIRECTLY ON TO THE ROAD. THE MACHINE SPREADS THIS MATERIAL UP TO 7M IN WIDTH AND IS CAPABLE OF LAYING 1.2M LINEARLY PER MINUTE AT 3.5 CM THICKNESS. THERE IS A HEATED SCREED BAR AND THE MACHINE RUNS ON STEEL LINES. A FURTHER ADVANTAGE OF GUSSASPHALT IS THAT IT APPEARS TO PERFORM BETTER THAN OTHER TYPES OF SURFACING WHERE STUDDED TIRES ARE USED. /AUTHOR/

  • Supplemental Notes:
    • Vol 130, No 3928, PP 36
  • Publication Date: 1967-9-16

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  • Accession Number: 00214750
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 16 1994 12:00AM