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Research Report 142 Materials & methods needed to prepare subgrades suitable for CAPTIF

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

The Canterbury Accelerated Pavement Testing Indoor Facility (CAPTIF) is a state-of-the-art pavement testing facility located at Christchurch, New Zealand. This report presents the results of the third stage, carried out in 1998, of a three-stage project to determine the materials and methods necessary to prepare appropriate subgrades of a desired strength to be used at CAPTIF. A subgrade construction specification was developed using the recommendations of reports from previous stages of the project. This primariy involved controlling the water content of the subgrade to achieve different subgrade strengths. A trial pavement was constructed at CAPTIF and subjected to 147,000 load repetitions. The properties of each pavement layer were carefully monitored during construction, at intervals during the loading and at the completion of the loading sequence.

Research Report 193 Valuation of travel time savings – market research

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

This project involved market research among motorists in New Zealand to establish unit behavioural values of travel time savings under a range of conditions, for application in the evaluation of transport projects.

Research Report 240 The economics of travel for education in New Zealand

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

A study undertaken in 2001–02 on the economics of travel for education had the following objectives:

Research Report 291 Bitumen durability

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

This report describes research in 2004 and 2005 aimed at improving the means by which the durability of bitumens manufactured or imported to New Zealand for use in chipseals is assessed and monitored. Bitumen durability refers to the long-term resistance to oxidative hardening of the material in the field. Although, in-service, all bitumens harden with time through reaction with oxygen in the air, excessive rates of hardening (poor durability) can lead to premature binder embrittlement and surfacing failure resulting in cracking and chip loss. Some means of assessing durability by accelerating the process in the laboratory is necessary. However, no internationally accepted ‘standard’ exists for bitumen durability, as for some other bitumen tests (eg penetration). Keywords: bitumen, chipseal, durability, oxidation, pavements, roads, testing

Research Report 339 Measurement valuation of public transport reliability

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

Reliability in public transport is important for operators and passengers alike. Reliability can affect users in one of two ways: as a delay when picking up the passenger and as a delay when the passenger is on the service. Reliability measures are typically used within performance regimes to evaluate the quality of service of public transport providers. This research, carried out in 2007, aims to find a method of measuring the value placed on public transport reliability in different contexts in New Zealand. As part of this project, a stated preference survey was designed and implemented to collect information about passengers’ current public transport usage, their attitudes to reliability and how they valued reliability.

Research Report 388 Reconstruction of coal tar contaminated roads by in-situ recycling using foamed bitumen stabilisation

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

Coal tar-derived roading material contains over 1000 times more polycyclic aromatic hydrocarbons (PAHs) than equivalent bitumen pavements and has been identified as a major source of PAHs in both Christchurch and Auckland aquatic receiving environments. Many old streets containing coal tar will soon require reconstruction, and therefore the excavation and potential disposal of contaminated road construction layers represents a significant financial and environmental problem. To address this problem, we evaluated in-situ foamed bitumen (FB)/cement stabilisation as an environmental acceptable method to reuse the contaminated tar road material.

Research report 436 Benefits of new and improved pedestrian facilities - before and after studies

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

Walking is an essential mode of transport. New and improved pedestrian facilities promote walking and provide greater access and mobility within our communities. The NZ Transport Agency has recently updated the procedures for the evaluation of pedestrian improvement projects. The benefit factor applying to new pedestrian trips was increased from $0.50 to $2.70/km, making pedestrian facility improvement projects more economically viable. Thus, estimating the increase in pedestrian flows (as opposed to simply recording existing pedestrian flows) is now important in the economic evaluation of new or improved facilities. This research analysed case studies at eight New Zealand sites where the implementation of new pedestrian facilities (or the improvement of existing facilities) led to increased pedestrian usage and improved perception of the sites. The study recorded pedestrian rates both before and after facility implementation, and analysed accompanying factors such as safety, delay and directness.

Research report 485 Ground vibration from road construction

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

There is an increasing requirement to control and manage ground vibrations generated by road construction and maintenance activities through project specific construction management plans. The objective is to minimise any potential adverse effects. The ability to reliably estimate vibration levels of specific construction activities at the project planning stage and to assess their likely effect on structures and their occupants is therefore required. Typical vibration characteristics for various activities, including site preparation, dynamic compaction and piling were measured for representative equipment and soil types to obtain baseline values for use in preconstruction assessments and to enable validation of available prediction methods. A review of international standards was also undertaken leading to two proposed criteria against which predicted vibrations can be assessed for damage and human perception. The possible application of data acquired from commonly used geotechnical methods, notably scala penetrometer for estimating soil attenuation and falling weight deflectometer to generate...

Research Report 535 Accurate and affordable location technology for New Zealand

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

A potential gap between available location technology and its use on the ground was identified in the New Zealand land transport sector. This research sought to bridge that gap and support the NZ Transport Agency's ('Transport Agency') goal to increase the use of appropriate location technology by its key providers. Consultation with these was undertaken to understand the requirements for location technology and any lessons learnt from previous implementations. A literature and technology review and evaluation identified suitably accurate and affordable location technologies for use in road asset management in New Zealand.

Research Report 074 Non-traditional materials for trench & bridge abutment backfill

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

An overview of non-traditional backfill materials has been compiled from material identified in an international literature search carried out in 1992. Materials considered include controlled low strength materials (CLSM), foamed concrete, fly ash, wood waste, expanded polystyrene (EPS), and various miscellaneous materials. General information as well as composition, properties, advantages, limitations and typical applications are pr4esented for each material. The properties determine the backfilling application to which each material is best suited. Most of these materials have potential for use in New Zealand provided their advantages and limitations are recognised and understood by would-be users.