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Displaying Page 5 of 85

Research Report 308 Environmental impact of industrial by-products in road construction – a literature review

Published: | Category: Environmental impacts of land transport , Research programme , Research & reports | Audience: General

The objectives of this project, undertaken 2005/6, were to:

review the international technical literature on the topic of environmental issues relating to the use of waste and industrial by-products in road construction applications, and
recommend a set of guidelines to allow road controlling authorities and environmental agencies to determine if various waste or environmental by-products are appropriate for use in road construction. The international literature shows that the topic of environmental impact is extremely complex and, by necessity, any assessment strategy needs to be relatively conservative for it to be practical, cost effective and reliable. The study has shown that a number of documents that address the issues of hazardous substances and acceptance criteria for contaminants are currently available in New Zealand. A new assessment process has been suggested as a result of the literature review.

Research Report 372 Resealing strategies to increase seal life and prevent seal layer instability

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

A study of cores from multilayer chipseals shows that fine solid materials (passing 4. 75 mm) fill a significant proportion of the chipseal volume that would otherwise be available for bitumen. If fines are ignored, the available voids are typically about twice the expected volume of bitumen that would be sprayed. Generation of fines may therefore contribute significantly to premature flushing. The origin of these fine materials remains to be examined; at least six different processes may contribute, and the relative contributions may vary from site to site.

Research Report 437 Next generation of rural roads crash prediction models pilot study

Published: | Category: Safety, security and public health , Research programme , Research & reports | Audience: General

The majority of fatal and serious crashes in New Zealand occur on rural two-lane roads. Data on historic crash patterns is not always sufficient to enable a suitable diagnosis of the safety deficiencies of various sections of this rural road network. It also cannot readily identify safety issues on low-volume roads and shorter sections of highway, where the relative scarcity of crashes may mask the considerable potential for safety improvements. This pilot study covers the second stage of a three-stage research project that aims to quantify the impact of all key road features on the safety of two-lane rural roads. This stage of the study involved the collection of road alignment, roadside environment, traffic flow, and crash data for 200 sections of rural road, each one 400m long, throughout the Waikato region of New Zealand.

Research Report 501 Assessment of shear stress limits in New Zealand design standards for high-strength concrete bridge beams

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

The design of concrete beams for shear loading is governed in New Zealand by the provisions of NZS 3101. The shear design provisions of NZS 3101 impose two limits on the permissible design shear capacity, including a maximum shear capacity of 8MPa. This 8MPa limit influences the efficiency of concrete beam design, and in particular the design of concrete bridge beams that have concrete compressive strengths greater than 40MPa. The validity of this limit was assessed through an examination of a number of other international design standards, statistical analyses using databases composed of all previous experimental testing of reinforced concrete (RC) and prestressed concrete (PC) beams, and results from an experimental investigation aimed at addressing deficiencies in the compiled databases. The research found that the limits in NZS 3101 are excessively conservative compared with the limits imposed in most other design standards.

Research Report 059 Development of the RAMM system: summary of responses to discussion document and recommendations arising

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

Responses to a discussion document on the development of the Road Assessment and Maintenance Management (RAMM) system, issued by Transit New Zealand in 1995, are summarised. Conclusions are drawn from the information in the discussion document and from the responses. Recommendations are made for development of the RAMM system covering the scope, objectives and functionality of the system, developments that should be undertaken, the involvement of Transit New Zealand, Transfund and other agents, financial assistance and research needs. Keywords: Activity management, information system, maintenance management, pavement management, RAMM system, road management

Research Report 062 Use of tyre rubber in bitumous pavements in New Zealand

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

A literature review was carried out in 1993 on the potential use of crumb-sized ground tyre rubber (GTR), obtained from recycling waste tyres, as an additive to bitumen used in constructing New Zealand pavements. GTR, also called crumb rubber, has been used either mixed with bitumen or incorporated as part of the aggregate fraction in hot asphalt mixes. The expected cost of the GTR and the cost of specialised blending and spraying equipment would make bitumen-rubber blends more expensive to use as a chipseal binder than the synthetic rubber being used in 1993 in New Zealand pavements. GTR could possibly be used in hot asphalt mixes where it would be expected to increase pavement flexibility at low temperatures. Insufficient information was available to make a benefit/cost analysis of its use under typical New Zealand pavement construction conditions. Keywords: Tyres, environment, disposal, roads, pavements, bitumen, binders, asphalts, New Zealand

P46 stormwater specification

Published: | Category: Drainage , Maintenance , Specifications | Audiences: General, Road controlling authorities, Road traffic engineers & consultants, Roading contractors

This specification sets out the requirements for the design, construction and operation of all stormwater improvement projects. It is anticipated that the standard stormwater specification is a starting set of specifications and may be adapted to address local issues and the scope of the project.     

Motorist service signs on state highways - information and application form

Published: | Category: State highways , Leaflets & brochures | Audience: General

For owners of motorist service facilities who would like to apply to have blue symbol signs on a state highway. This leaflet should be read in conjunction with the NZ Transport Agency Traffic Control Devices Manual Part 2: Direction, Service and General Guide Signs, Section 5. 0: Service Signs.

Research Report 618 Trialling best value delineation treatments for rural roads

Published: | Category: Activity management , Research programme , Research & reports | Audiences: General, Roading contractors

Providing a safe, comfortable, cost-effective visual environment to help drivers navigate rural roads requires a better understanding of the strengths and limitations of different delineation devices, materials and treatment configurations. An international literature review examined different options to test on low-volume rural New Zealand road settings, and an expert panel prioritised four of these options to be trialled.  

Four on-road trials were run to examine delineation configurations and materials that could provide better value for rural roads. The key aspects to deciding treatments were to do with targeted delineation (to assist drivers in intuitively signalling more difficult parts of the road network), consolidation (where one configuration with a new product might replace two traditional products), and better delineation in rain, which is arguably a common poor visibility environment (where crashes are over represented).

Research Report 111 Moisture in pavements: direction for New Zealand research

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

Research into moisture in pavements in New Zealand started in 1979 and led to the instrumentation and monitoring of moisture in two sample pavements. The project recorded in this report was commissioned in 1995 to indicated the future directions that New Zealand research should take to evaluate moisture conditions in pavements. Fundamental studies in New Zealand should not be commissioned until the results of long-term projects underway in the US become available. These projects are researching the long-term effects of seasonal changes of moisture on the strength and performance of pavements. Instead, research during pavement operations is recommended and should:

Determine the effects of a range of pavement parameters on the theoretical distribution of moisture in pavements by performing a sensitivity analysis to select suitable sites.
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