HEAT-INSULATING COURSES FOR RURAL ROADS

THE AUTHOR STATES THAT NORMAL SAND AND GRAVEL FROST BLANKETS, WHICH ARE OFTEN VERY DIFFICULT TO CONSTRUCT AND ARE EXPENSIVE, MAY BE REPLACED BY HEAT INSULATING COURSES. TWO TYPES OF INSULATING COURSE ARE DESCRIBED: (1) HARD EXPANDED MATERIAL 2.5 CM THICK COMBINED WITH A THIN FROST BLANKET, AND (2) LIGHTWEIGHT MATERIALS 15.20 CM THICK WITHOUT A FROST BLANKET. THEY DIFFER WITH RESPECT TO HEAT CONDUCTIVITY, DRY DENSITY, SENSITIVITY TO TEMPERATURE, MODULUS OF ELASTICITY AND BEHAVIOUR UNDER TRAFFIC. THE LIGHTWEIGHT MATERIALS SUCH AS STYROPOR CONCRETE, EXPANDED CLAY WITH CEMENT OR BITUMEN, OR GAS CONCRETE CAN BE PLACED WITH FINISHERS AND FORM PART OF THE ROADBASE, WHEREAS THE LAYING OF THE EXPANDED MATERIALS HAS TO BE CARRIED OUT MANUALLY TO A LARGE EXTENT. THE RESULTS OF MEASUREMENTS TEMPERATURE AND COMPRESSION STRESSES ON EXPERIMENTAL ROADS ARE GIVEN.

Media Info

  • Features: Figures; References;
  • Pagination: p. 73-82
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00238170
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Jul 31 1974 12:00AM