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Research Report 122 Flushing processes in chipseals: effects of trafficking

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

Flushed and unflushed chipseal samples were taken in 1997–98, near sites where flushing had occurred on state highways in the Wairarapa, New Zealand. The unflushed seals were tracked with a weighted wheel in a temperature-controlled cabinet, and the changes of texture depth occurring during approximately 100,000 wheel passes were measured. Bitumens from flushed seal samples were characterised rheologically. The results were analysed to determine factors controlling the occurrence and degree of flushing resulting from trafficking of chipseal surfaces.

Publication details

  • Author:
  • Published: 1998
  • Reference: 122

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