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Research Report 175 Effects of multiple presence & monitoring period on bridge health monitoring

Published: | Category: Research & reports , Research programme | Audience: General

Bridge health monitoring is a method of evaluating the ability of a bridge to perform its required task (also called fitness for purpose) by monitoring the response of the bridge to the traffic loads it has to withstand.

Research Report 258 Detailed experimental investigation for foamed bitumen stabilisation

Published: | Category: Research & reports , Research programme | Audience: General

As the demand for a cost-effective and environmentally friendly pavement stabilisation method increases, so has foamed bitumen stabilisation for unbound granular pavement layers started to gain broad acceptance worldwide.

Research Report 341 The prediction of pavement remaining life

Published: | Category: Research & reports , Research programme | Audience: General

The primary objective of the project was the development of criteria to define the end-of–life condition of pavements. These criteria could then be used in pavement performance modelling to obtain a more robust measure of remaining life. Another objective was the generation of a new model for maintenance costs. This could then be combined with the existing models for roughness and rutting to define a distress level at which rehabilitation should occur. None of the maintenance cost models developed were particularly successful in producing a reliable prediction of maintenance costs based on the pavement characteristics available from RAMM. Therefore, a logit model was developed to predict rehabilitation decisions. The major factors in the rehabilitation model were maintenance costs, traffic levels and roughness. The rehabilitation decision model derived for this study predicted rehabilitation decisions well. Approximately 72% of pavements that had been rehabilitated were predicted as requiring rehabilitation.

Research Report 424 Design moisture condition guidelines for pavement design and material assessment

Published: | Category: Research & reports , Research programme | Audience: General

A pavement design model developed in the USA is used to estimate the equilibrium degree of saturation in pavement subgrade and basecourse materials. The model is applicable to all the mainland US states, including areas with similar climatic conditions to New Zealand. The research on which this report is based, which was carried out in 2008/09, indicates that the US-based model is appropriate to New Zealand conditions, where typical equilibrium moisture conditions are in the range of 50–60% for granular basecourse and typically greater than 85% for fine-grained subgrade soils.

Research report 466 High-stress corners

Published: | Category: Research & reports , Research programme | Audience: General

A programme of research was undertaken to better understand chip loss on curves with the aim to improve chipseal design and selection practices. The research involved on-road measurements and computer simulation of tyre forces during cornering manoeuvres; correlation analysis using road surface, road geometry and traffic variables contained in the NZ Transport Agency's RAMM database; and finite element analysis of pavement surface stresses induced by a cornering truck.

Research Report 055 A model to predict logging traffic and associated pavement loading from New Zealand forests

Published: | Category: Research & reports , Research programme | Audience: General

A computer model was devised in 1993 to predict heavy traffic flows generated by the operations arising from the 30-year planning period of a production forest (from planting to harvest) in New Zealand, for an area served by a road network. Economic strategies are suggested.

Research Report 082 Protection from scour of bridge piers using riprap

Published: | Category: Research & reports , Research programme | Audience: General

The results of an experimental study carried out in 1993 of the use of riprap to protect bridge piers against scour are presented. Experiments involved several sizes of bed sediment and riprap, and different types of bridge piers, under conditions involving general sediment transport and bed lowering. The interaction between adjacent piers and between a pier and an adjacent abutment is considered.

Research Report 133 Fibre reinforcement of stabilised pavement basecourse layers – literature review

Published: | Category: Research & reports , Research programme | Audience: General

This report presents the results of a literature review on the topic of fibre reinforcement in cemented pavement base materials. While this specific topic has not been widely researched an abundance of literature exists on the topic of fibre-reinforced concrete. The researchers have used the qualitative similarity between fibre-reinforced cemented base materials and fibre-reinforced concrete to investigate the potential viability of using fibres to improve the mechanical performance of cemented base materials. Using fibres has great potential in cemented pavement base materials. Reinforcing fibres generally increase the ultimate tensile and flexural strengths, toughness and residual strength of cemented materials. In the realm of pavement base performance, reinforcing fibres may limit the extent of both drying shrinkage and fatigue cracking so that any cracks forming in the cemented matrix do not represent significant structural defects. Reinforcing fibres have been produced using a large number of synthetic and natural materials.

Research Report 177 Quantifying and improving the performance of road markings

Published: | Category: Research & reports , Research programme | Audience: General

This project was undertaken to establish reliable test methods by which the performance of road markings in New Zealand can be assessed. These tests can then be used by roading authorities in specifying performance and by contractors and manufacturers to improve products.

Research Report 218 Improved road segmentation for pavement management systems in New Zealand

Published: | Category: Research & reports , Research programme | Audience: General

A robust methodology has been developed, in 2000–2001, to locate change points (i.e. clearly defined breaks) in New Zealand roads where significant changes in pavement performance occur. Both pavement condition and construction data are required to apply the methodology, which utilises standard time-series and process control statistical techniques, i.e. auto-correlations and cusum methods respectively. The methodology has considerable potential for generating treatment length subdivisions for new or existing road networks, or for dividing road networks into like-performing (homogeneous) sections for the purposes of deterioration modelling and asset management, in existing pavement management systems.