The damage that can be caused by moisture entering the road surface has been of deep concern to highway engineers for many years. There have been numerous tests introduced to try and determine the adhesive bond between a given bitumen and aggregate pairing. Many of these tests have been criticised as they do not replicate the conditions that are occurring on the road itself. The authors, in an attempt to overcome this problem, have investigated the use of two very different test methods. These tests allow different parameters to be investigated permitting a clearer overall view of the various factors that interact to give a specific level of adhesion. This investigation uses three different types of aggregate, i.e. Old Red Sandstone, Tertiary basalt and Silurian greywacke with a 200 pen bitumen. The use of different rock types with one bitumen allows the effect of aggregate mineralogy to be determined. The two tests (the SHRP Net Adsorption test and the Cantabrian test) permit the assessment of the aggregate bitumen bond in dry and wet conditions. As a result the effect of introducing moisture into a given system can be calculated, allowing the prediction of those systems which may have a higher likelihood of stripping before the actual roadworks commence. (A) For the covering abstract see IRRD 877985.


  • English

Media Info

  • Features: References;
  • Pagination: p. 123-33

Subject/Index Terms

Filing Info

  • Accession Number: 00723109
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-86050-287-2
  • Files: ITRD
  • Created Date: Jul 26 1996 12:00AM