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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 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 152 Field evaluation of catchbasin insert performance

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

Studies carried out (between 1992 and 1995) on stormwater quality in Auckland Region, New Zealand, reveal that suspended solids, heavy metals (such as lead, copper and zinc), and petroleum-based hydrocarbons are present in significant concentrations in stormwater. The main source of these contaminants is the transport system, including run-off from roads and emissions from vehicles.

Research Report 446 The variability of road traffic noise and implications for compliance with the noise conditions of roading designations

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

Many road designations have conditions with respect to noise that require that when the road is completed, measurements will be undertaken to prove that the performance standards of those conditions have been fulfilled. However all measurements are subject to variability, and the designation conditions do not address either the expected nature of this variability, or how it should be accounted for in establishing compliance with the conditions.

Research Report 343 Environmental effects of emulsions

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

This report describes a study, carried out in 2006–2007, of the potential toxicity to the environment (ecotoxicity) of cationic bitumen emulsions used for chipsealing (surface dressing) in New Zealand. The ecotoxicities of the separate components of bitumen emulsions are reviewed to assess their contribution to emulsion ecotoxicity. Overseas reports on the environmental dangers of a non-ionic bitumen emulsion (a power station fuel) and runoff from cold mix asphalt are examined for relevant applications to sealing emulsions. Ecotoxicities are measured for four representative New Zealand emulsions. The implications of the findings for possible environmental classification of emulsions by environmental authorities are discussed.

Research Report 393 Relative costs and benefits of modal transport solutions

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

This report describes the outcomes of a study commissioned by the NZ Transport Agency to inform local authorities about the costs and benefits of transport modes. The aim of the study has been to provide general advice on the relative cost and benefits of alternatives with a focus on passenger transport in urban areas.

Research Report 441 Are the harmful emissions from New Zealand's light duty vehicle fleet improving?

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

Vehicle emission reduction technologies are continually improving. In theory, as new vehicles replace old ones in the fleet and as fuel quality improves, the amount of pollutants discharged on a per vehicle basis should (on average) be reducing. However, it is unclear how much influence new technology and improved fuel is actually having on the 'real-world' emissions from the light duty vehicle fleet as a whole. This project used remote sensing to measure real-world vehicle emissions in Auckland in 2009 and then compared the results with measurements taken at the same sites in comparable campaigns undertaken in 2003 and 2005. The main objective of the project was to address the question: Are the harmful emissions from New Zealand's light duty fleet improving under the current 'business as usual' scenario? Emissions measurements (carbon monoxide, nitric oxide, hydrocarbons and uvSmoke as an indicator of fine particulate matter) were stored together with vehicle...

Research Report 019 Land transport externalities

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

The report provides a literature review and research plan describing where further research is needed to quantify or value external effects, otherwise known as externalities, from the land transport system. It examines the efficiency and effectiveness of economic and regulatory instruments and mechanisms for internalising transport-related costs. The report examines how the prnciples of sustainable management apply to the land transport system under the Resource Management Act 1991.

Research Report 395 Enhancing the control of contaminants from New Zealand's roads: results of a road runoff sampling programme

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

This study provides guidance on vehicle emission factors (VEFs) for loads of copper and zinc discharged in road runoff, and the performance of stormwater treatment devices for removing these metals and total suspended sediments (TSS). Between February 2008 and June 2009, a field programme comprising the measurement of road runoff volumes and the collection and analysis of runoff samples was conducted at four sites, of differing traffic characteristics, in the Auckland Region. Concentrations of copper and zinc were higher at a congested site than at two sites at which traffic generally moved freely. Substantially lower TSS and metal concentrations were measured at a moderately congested site, counter to expectations and possibly reflecting the recent resealing of the road surface at this location with open-graded porous asphalt (OGPA). VEFs estimated using a contaminant accumulation/wash-off model provided the basis for determining a set of guideline copper and zinc VEF values for (1)...

Research Report 348 The development of gravel deterioration models for adoption in a New Zealand gravel road management system

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

This report provides the outcomes from research based on the Land Transport New Zealand gravel road monitoring programme that commenced during 2002 and included the cooperation of 51 local authorities. These sections were monitored on a sixmonthly basis and all relevant data such as maintenance, rainfall where available and evaporation were incorporated into a national database. This research project included the provision of practical guidelines for the construction and maintenance of gravel roads. In addition, the gravel road data were analysed and outcomes are presented. The resulting models are effective indications of gravel loss on a network scale but further research would be required for more detailed models. This can be achieved by collecting more information on the impact of routine maintenance such as blading.
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