Finding the value of materials testing, a field study. David Alexander, Road Science


The civil construction industry in New Zealand is serviced by a large number of laboratories carrying out testing for materials used. The results these laboratories produce are often compared to a specification that gives site engineers the satisfaction they need to ensure that they will stand the test of time.
This presentation will examine how this laboratory based information can be matched up with measurements taken from the field, and used to determine the lifespan of materials as they degrade. The methodology discussed will expose the end of life failure mechanism for asphalt surfacing, and how this mechanism can be quantified in the field. Field trials took place in the upper North Island where sites were reviewed after ten years in service.
The findings from these trials allow for the calculation of surface course life with unprecedented accuracy. Development of a tool that predicts the amount of time a surface course is expected to deliver a specific level of service is currently under development.

David is the Road Science R&D Projects Manager. His unique approach and insight has enabled Road Science developments to greatly accelerate. His current portfolio spans from materials development to IT solutions. Through his insights, David has established himself within Road Science as the first port of call for design life, asset whole of life cost, weather forecasting, and commercial feasibility. David’s new ideas are paving the way forward, delivering innovative solutions to age old problems