Over the last 10 years, 164 kilometres of the Hawkes Bay and Gisborne State Highway network has been recycled. This has involved the milling of 1,323,000 square metres of pavement to remove unstable chip seal layers and to minimise the whole of life maintenance cost. A programme of monitoring the outcome of this low cost maintenance treatment has been implemented by Transit New Zealand. This has identified a range of factors influencing the risk of post construction failure over the life of the recycled pavement. Some of these are unavoidable such as unforeseen changes in the depth and characteristics of the in-situ pavement materials, while others are sensitive to the skill and construction practices implemented by the contractor. This paper describes the development of a probabilistic model to evaluate the present worth value of good construction practices over a 25 year analysis period. The paper then outlines the way the output from this analysis can be used, within a competitive pricing environment, to determine how much more a road controlling authority should be prepared to pay to secure the supplier with the highest non-price (quality) attributes, compared to any of the other potential suppliers, in advance of the pricing envelopes being opened. (a) For the covering entry of this conference, please see ITRD abstract no. 0612AR242E.
Samenvatting