INSULATION MATERIALS IN ROAD CONSTRUCTION /IN NORWEGIAN/

INSULATION MATERIALS ARE USED TO REDUCE FROST ACTION DAMAGE TO HIGHWAYS IN NORWAY. THE INSULATION MATERIALS WILL REDUCE THE HEAT FLOW TO AND FROM THE SUBGRADE; ALSO, THEY WILL REDUCE THE TEMPERATURE VARIANCE IN THE SUB-GRADE. IF THE HEAT CONDUCTIVITY IN THE INSULATION IS SET TO O.03 KCAL/ M H DEG C, THE HEAT FLOW IS APPROXIMATELY PLUS OR MINUS 10,000 KCAL/M SQUARE. A TABLE IS PRESENTED SHOWING THE THICKNESS OF INSULATION (E.G., EXTRUDED POLYSTYRENE) AND THE CORRESPONDING HEAT FLOW IN LIEV TEST ROAD FROM NOVEMBER TO APRIL 1968/69. INSULATION MATERIALS WITH COMPRESSIVE STRENGTH BETWEEN 1 AND 4 KG/CM SQ SHOULD BE PROTECTED FROM CONSTRUCTION TRAFFIC (HEAVY LOADS) BY A 20 - 30 CM THICK CUSHION OF COMPACTED GRAVEL. DIFFERENT INSULATION MATERIALS WITH DENSITIES 24 - 40 KG/M CU WERE TESTED FOR VARIATIONS IN DENSITIES, COMPRESSIVE STRENGTH, AND DEFORMATION AT PULSATING LOADS. IT WAS FOUND THAT THE COMPRESSIVE STRENGTH VARIES WITH THE DENSITIES. A SEPARATE FILM OF POLYETHYLENE, ASPHALT OR ALUMINUM CAN BE USED ABOVE AND SOMETIMES BELOW THE INSULATION MATERIAL AS A BARRIER AGAINST WATER ABSORPTION IN INSULATION MATERIALS FOR VARIOUS COUNTRIES. SINCE INSULATION THICKNESS, DENSITIES, CLIMATES, AND GEOTECHNICAL CONDITIONS MUST BE TAKEN INTO CONSIDERATION. THE NORWEGIAN ROAD RESEARCH LABORATORY EXPERIMENTED WITH POLYSTYRENE, POLYSTYRENE CONCRETE, EXPANDED CLAY, EXTRUDED POLYSTYRENE, AND ROCKWOOL.

  • Supplemental Notes:
    • No 3, pp 29-42, 12 FIG, 5 TAB, 28 REF
  • Corporate Authors:

    Royal Norwegian Council Sci & Ind Res

    ,    
  • Authors:
    • Saetersdal, R
  • Publication Date: 1971-7

Subject/Index Terms

Filing Info

  • Accession Number: 00238009
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 29 1971 12:00AM