SMA experiences in Auckland, New Zealand

SMA was introduced into New Zealand almost a decade ago. The design methodology was borrowed mostly from Germany. In New Zealand the emphasis has been on surface texture-macro texture for retention of skid resistance. It was found that mixes made using the BCA 9808 specification tended to become full and lose macro texture with time. This did not necessarily mean catastrophic loss in skid resistance but aesthetically it was not acceptable and macro texture was certainly lost. Fulton Hogan Auckland embarked on a program to redesign the SMA mixes so that surface texture was retained. Binder rise was delineated into two types- flushing caused by draindown or the compromise of the integrity of the binder films and mastic rise caused by excess mastic or inadequate mastic stiffness. Mixes were designed to Transit NZ P23 specification rather than BCA 9808. Trials have indicated that surface texture can be maintained and that mastic rheology is a significant contributor top pavement performance. (a) For the covering entry of this conference, please see ITRD abstract no. E216180.

  • Authors:
    • HOLLERAN, G
    • RHODES, K
    • SIMMONS, D
  • Publication Date: 2007-10

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01099902
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD, ATRI
  • Created Date: May 27 2008 8:59AM