List of tests for bitumens and asphalt mixtures

BRRC has several tests for bitumens and asphalt mixtures, which are used both for research purposes and in giving assistance to third parties.

1. Performance tests on bitumens

  • DSR: mainly to evaluate the stiffness of a binder.
  • BBR to evaluate the low-temperature properties of bitumens (mainly failure behaviour).
  • DTT to evaluate the low-temperature properties of bitumens. Specimens are strained to failure. The critical temperature is given for a failure strain of 1 %.
  • RCAT to simulate the ageing of bitumens in asphalt mixtures.
  • MSCRT to evaluate resistance to rutting.
  • Force-Ductility to evaluate cohesion in traction.

2. Performance tests on asphalt mixtures

  • Wheel tracking test to determine the resistance to rutting of asphalt mixtures.
  • Triaxial test to determine the resistance to permanent deformation of asphalt mixtures.
  • Indirect tensile test before and after conditioning in water, to determine the water sensitivity of asphalt mixtures.
  • TSRST to determine resistance to low-temperature cracking.
  • Indirect tensile test on cylindrical specimens, to determine the stiffness of asphalt mixtures.
  • Two-point bending test to determine the stiffness of asphalt mixtures.
  • Two-point bending test to determine the resistance to fatigue of asphalt mixtures.
  • Gyratory shear test to determine the compactibility of asphalt mixtures.
  • Method for the laboratory ageing of bulk asphalt, to simulate the ageing process of an asphalt mixture on site (under development).
  • Spectophotometer for the objective colour determination of coloured asphalt.
  • Conditioning method to evaluate the colour durability of coloured asphalt.
  • Fretting test to assess the susceptibility to fretting of a surface course.
  • Interlayer adhesion tests to measure the bond strength (in shear or direct tension) between two layers.

3. Field tests on asphalt

  • Determination of the density of asphalt layers with nuclear measuring devices.

4. Tests on mastic asphalt

  • Indentation test to determine resistance to permanent deformation by static point loading.
  • Uniaxial cyclic compression test to determine resistance to permanent deformation by dynamic loading.
  • Paris test to determine resistance to impression under long-term static loading.
  • Wheel tracking test to determine resistance to rutting.
  • TSRST to determine resistance to low-temperature cracking under restrained shrinkage conditions.
  • Restrained shrinkage: to determine the resistance to low-temperature cracking of frame-shaped specimens under restrained shrinkage conditions (French “retrait contrarié” method).
  • Two-point bending test: see 2. Performance tests on asphalt mixtures (modulus).
  • Two-point bending test: see 2. Performance tests on asphalt mixtures (fatigue).

5. Standard tests on bitumens

Including:

  • Penetration (*).
  • Ring-and-ball softening point (*).

6. Standard tests on fillers for asphalt mixtures

Including:

  • Grading (*).
  • Voids ratio (*).
  • Bitumen number (*).
  • Density (*).
  • Water content (*).
  • Water sensitivity (*).
  • Methylene blue value (*).
  • % of slaked lime (*).
  • Stiffening power (mastic test).
  • Solubility in water.

7. Standard tests on asphalt mixtures

Including:

  • Soluble binder content (*).
  • Grading (*).
  • Binder recovery (*).
  • Total thickness.
  • Thickness of the various layers.
  • Bulk density.
  • Maximum density.
  • Voids ratio.
  • Rate of compaction.

(*) Test within the scope of BELAC accreditation No. 175-TEST.