Bitumens having a relatively high permittivity 'weather' more rapidly in rolled-asphalt wearing course than those with a lower value. The development of the permittivity test for bitumen is described. The method uses a commercially available micrometer capacitor with guard ring and the bitumen sample is cast into a parallel-faced glass cell. Permittivity is measured at 25 deg plus or minus 0.25 deg C using a bridge frequency of 1592 hz. The repeatability and reproducibility of the test are 0.006 and 0.008 respectively; this precision is considered to be adequate for an acceptance test. Possible further test development is outlined. /Author/TRRL/

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • DAINES, M E
  • Publication Date: 1977


  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 31 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00165632
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: TRRL Suppl. Rpt. 312Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jun 14 1978 12:00AM