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Research Report 132 Environmental management for roading contractors: III. Provisional guidelines for environmental management during road works

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

This project was undertaken in 1997–98 to prepare two sets of provisional environmental guidelines for roading contractors carrying out road works in New Zealand.

Research Report 083 Road noise generated by concrete block pavements

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

The use of concrete block pavers as a road surfacing in residential and industrial areas is increasing in New Zealand. This has raised concerns regarding the noise levels generated by vehicles travelling over such surfaces.

Research Report 219 Recycling of materials for more sustainable road construction

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

This research project examined the economic, structural and attitudinal impediments to the recycling of materials in roading in New Zealand. It found that, although several materials (eg asphalt, tyres, waste oil, base course and aggregates from crushed concrete) could be recycled, little (excepting some base course) is recycled into New Zealand roads at present. The structural process of specifications, tender evaluation and risk sharing are major impediments, along with the lack of knowledge of and experience with recycling withing the roading industry in New Zealand. However, the industry believes it could quickly develop recycling and build its expertise if a supportive structural process was established. Based on industry input and a review of international recycling initiatives, recommendations to overcome these impediments are proposed.

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 260 Integrated stormwater management guidelines for the New Zealand roading network

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

These guidelines for integrated stormwater management provide guidance on a range of issues relating to the management of stormwater run-off from state highways and local roads in New Zealand, including:

Research Report 261 Strategic environmental assessment: application to transport planning in New Zealand

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

Strategic environmental assessment (SEA) is widely used in transport policy development and planning in Europe and North America. It is recognised as a valuable means of analysing and addressing the potential environmental and social impacts of transport policies and plans. In focusing attention on the environment, SEA also serves to highlight the importance of environmental sustainability in transport planning. To date, experience of SEA in New Zealand has been limited. However, recent changes to New Zealand's transport policy and legislative framework provide the opportunity to develop a more systematic approach to SEA. The introduction of the New Zealand Transport Strategy and the Land Tranport Mangement Act 2003 has enhanced significantly recognition of the environmental and social impacts associated with tranport. Importantly, the provisions of the act also incorporate a number of elements of effective SEA. These include the act's sustainability focus, its requirements for early and full consideration of alternatives...

Research Report 345 Contaminant characterisation and toxicity of road sweepings and catchpit sediments: towards more sustainable reuse options

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

In 2006–2007, 35 road-derived sediments (RDS) consisting of street sweepings and catchpit (ie sump) sediments, were collected from three cities in New Zealand; namely Auckland, Hamilton and Christchurch. The concentrations, mobility and toxicity of contaminants were determined in order to assess the suitability of RDS for certain reuse applications. The current situation in New Zealand is that all RDS must be disposed of in landfills. The RDS were analysed for total petroleum hydrocarbons (TPH), polycyclic aromatic hydrocarbons (PAHs) and the heavy metals, lead, copper and zinc – with respective median (n=35) concentrations of 1220, 6.3, 122, 67, 422 μg/g. Comparisons with soil guideline values for ecological protection (Dutch and Canadian) and reuse of biosolids for land application (New Zealand), indicated that zinc will be the most problematic contaminant with respect to mitigating environmental risks in any reuse applications of RDS in New Zealand.

Research Report 221 A methodology for assessing the biodiversity of road networks: a New Zealand case study

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

The public road network makes an extensive and unique contribution to the public lands of New Zealand. It has a total area greater than our fifth largest national park, and connects and bisects New Zealand's towns and landscapes. While the main purposes of road construction and management are transport efficiency and safety, significant benefit can be obtained by enhancing other aspects of the road reserve, such as its biodiversity or scenic values, and reducing the negative impacts of the road and roading activities on the surrounding areas.

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 306 Assessing the environmental effect of new and recycled materials in road construction

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

The introduction of new or alternative (recycled wastes) materials in road construction may have benefits in terms of cost reductions, improved surfacing or pavement performance. However, it is essential to ensure that such innovations do not result in long-term negative impacts on the environment eg through the leaching of toxic chemicals into waterways. The aim of this research, conducted in 2005–2006, was to develop guidelines to provide assistance to New Zealand roading authorities, roading contractors and suppliers when deciding whether to approve, or seek approval for, new or recycled materials for road construction. The guidelines do not consider environmental impacts, such as sediment runoff, which are associated specifically with construction activities. Guidelines for minimising environmental impacts during construction have been published previously and will also apply to construction activities using new or recycled materials. Keywords: classification, ecotoxicity, environmental assessment, hazardous substances, leaching, legislation, road construction materials, recycling, regulations, testing, toxicity,...
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