Laboratory measurement of bond between asphalt layers

The laboratory measurement of bond strength between asphalt layers undertaken using a modified version of the Leutner shear test and a laboratory version of the torque test is described. Cores were taken from slabs prepared in the laboratory as well as from the field coring. The shear strength measured from the Leutner test was found to increase approximately in proportion to the shear displacement at the shear strength, independent of the bond condition. The shear strengths from the 20mm dense bitumen macadam / 28mm dense bitumen macadam specimens were generally found to be lower than the corresponding shear strengths of the stone mastic asphalt / 20 mm dense bitumen macadam specimens. The shear strength was found to decrease as the temperature increases and as the loading rate decreases. The peak torque values measured from the torque test for the stone mastic asphalt / 20 mm dense bitumen macadam specimens was found to be generally higher than those for the 20mm dense bitumen macadam / 28mm dense bitumen macadam specimens. The peak torque was found to reduce with increasing temperature and there was found to be a reasonably good correlation between the shear strength measured from the Leutner test and the peak torque. Results from Leutner tests on field cores showed that the shear strength at the interface between surfacing and binder course is typically higher than at the interface between binder course and base. The maximum shear strength measured using the modified Leutner shear test and the peak torque showed a similar correlation to that obtained from the laboratory manufactured specimens. For the covering abstract see ITRD E145817

  • Authors:
    • SUTANTO, M
    • COLLOP, A
    • AIREY, G
    • ELLIOTT, R
    • CHOI, Y
  • Publication Date: 2006

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01155342
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Apr 23 2010 11:02AM