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Research Report 137 Chipseal bitumen hardening trials In New Zealand

Published: | Category: Research & reports , Research programme , Performance monitoring , Activity management , Natural hazard risk management , Safety, security and public health , Environmental impacts of land transport , Transport demand management , Integrated land use and transport systems , Sustainable land transport , About the research programme , Economic development | Audience: General

This report summarises the results of several road trials carried out in New Zealand, over 15 years between 1989 and 1998, to investigate the hardening of bitumen in chipseals. Such hardening is expected to limit the potential lifetimes of the chipseals. Suggestions are made for further research to develop ways to select bitumens to minimise types of seal distress associated with bitumen aging.

Publication details

  • Author:
  • Published: 1999
  • Reference: 137

A PDF scan of this NZ Transport Agency research report is available from