Key aspects of good performing Cape Seals

The Cape Seal originated in the Western Cape Province of South Africa and typically consists of a single seal with the voids between the aggregate filled with slurry. Good performance under most conditions, which include urban and rural environments, low maintenance capability and cold weather construction, resulted in this seal type being selected as the preferred initial seal type on many roads. However, increase in traffic volume and load, availability of new binder types and variations in the seal structure and construction process, have led to some premature failures in recent years in the form of early cracking, bleeding and/or ravelling. Information and conclusions drawn from seven investigations, as well as laboratory testing results, have provided significant insight into the causes and mechanisms of failure. This paper summarises the findings related to various case studies and relevant testing and provides recommendations regarding the selection of appropriate binders for different conditions, design and construction processes to ensure good-performing Cape Seals.


  • English

Media Info

  • Pagination: 9p
  • 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: 01597127
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:16AM