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Research Report 129 Durability of concrete road bridges 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

Transit New Zealand regional offices and selected local authorities were asked for information from their records on age and proximity to the coast of their bridges. Together they maintain more than 10,500 bridges with concrete superstructures on New Zealand roads. They also completed a questionnaire to identify common durability problems on concrete bridges, and to identify ways that would enable the bridge asset to be more effectively managed.

Responses showed that most concrete bridges are in acceptable condition. Deck joint deterioration is the most common maintenance problem, and affects bridges of all ages. Reinforcement corrosion is more common on older bridges and on those near the coast. Current standard concrete construction specifications ensure at least a 50-year service life if they are followed during design and construction. A national bridge management system would provide a cost-effective means of managing information on bridge condition, location and construction details.

Publication details

  • Author:
  • Published: 1999

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