Experience with Winter Cape Seal construction in the Karoo: a case study

The pre-coating of surfacing aggregates can promote the early adhesion of the aggregate to the binder at lower temperatures. This case study investigate the performance of pre-coated versus untreated surfacing aggregate for the construction of a 19 mm Cape Seal on National Route projects with winter grade binders. The economic justification of pre-coating aggregate, dealt with briefly in the paper relates to reduced implementation time and time cost saving associated to it. This study further focus on the flux content of these binders and how it impacts on the lifespan of the seal. Since the introduction of the principle of using unfluxed binders in construction processes during winter periods, these are being accepted at face value on construction sites and any testing to determine possible fluxing derivatives are neglected. Possible fluxing content of these binders were later investigated and confirmed by means of laboratory testing. This adds some complexity as to how many controlling factors need to be consistently checked so that positive experiences are gained from the use of binders outside the embargo period.


  • English

Media Info

  • Pagination: 5p
  • Monograph Title: 11th Conference on Asphalt Pavements for Southern Africa: CAPSA15, 16-19 August 2015, Sun City, South Africa

Subject/Index Terms

Filing Info

  • Accession Number: 01597154
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:17AM