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Research Report 001 Use of non-standard road aggregates from Whanganui and Taranaki regions

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

Road aggregates in the Whanganui and Taranaki regions are generally softer than those used elsewhere in New Zealand. However the costs of importing premium quality aggregate (e.g. that which complies with TNZ M/4 specification) is prohibitive. Instead, local practitioners have utilised local materials with success.

Research Report 002 Communicating about use of road aggregates

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

A limited survey of roading practitioners was carried out to determine their opinion and needs with respect to communicating the findings of research about the properties of unbound aggregates.

Research Report 006 Geotextiles

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

Geotextiles are permeable textile fabrics used in engineering applications.

Research Report 011 Emulsified bituminous materials in road maintenance and construction: a survey of current New Zealand practice

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

Bitumen emulsions are now being used in almost every application in which hot, cut-back or fluxed bitumen binders are used.

Research Report 012 Quantification of intangibles: a review of intangible factors for Transit New Zealand's project evaluation manual

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

Appendix A7, Intangible Costs and Benefits, of Transit New Zealand's Project Evaluation Manual (1991 edition) is reviewed. The review makes suggestions on: additional intangibles which should be included; modifications to intangibles already recognised in the PEM; methods by which the intangibles could be measured or quantified; and further research to assist the quantification of the intangibles to be used in Appendix A7.

Research Report 013 Evaluation sensitivity analysis

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

The guidelines for sensitivity analysis in project evaluation, as used in the Transit New Zealand Project Evaluation Manual (PEM), have been improved. This report provides an approach and methodology for sensitivity analysis that is of practical assistance in road project evaluation, and includes a revised version of Appendix A9, Sensitivity Analysis, for the PEM. Sensitivity analysis determines how sensitive a project analysis (eg its benefit:cost ratio) is to the effect of varying one input parameter at a time.

Research Report 017 Aggregates for road pavements

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

A review has been made of literature describing the results of research into the properties and performance of unbound mineral aggregate used in the construction of road pavements. This review highlights the different approach taken in New Zealand to the design and construction of highway pavements, compared to that used in the United Kingdom, the United States, Australia and Europe. In New Zealand, unbound aggregate is used as a structural layer immediately under a thin bituman seal.

Research Report 021 Investigation into the use of solvents for bitumen testing

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

Dipentene (a solvent derived from radiata pine) and toluene were investigated as alternatives to the ozone-depleting methyl chloroform used in bitumen content determinations of asphalt. Toluene was also considered as an alternative to trichloroethene used in the determination of bitumen solubility, as specificed in Transit New Zealand Specification M/1.

Research Report 022 Safaniya bitumen – verification of chemical properties

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

One 1986 and three 1991 180/200 penetration grade Safaniya bitumens (from Saudi Arabia) produced by the Marsden Point Refinery were analysed by a range of procedures to detect any significant differences in chemical composition. Changes in chemical composition may have helped explain the unusually high incidence of chipseal stripping failures that occurred over the 1990/91 sealing period.

Research Report 025 Investigation into the high incidence of pavement chip loss

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

A high incidence of unexplained chip loss occurred on New Zealand roads following the 1989/90 to 1991/92 sealing seasons. Data based on detailed interviews followed by site inspections covering over 80 cases from Auckland to Invercargill are analysed. Principal causes are identified. Recommendations for immediate action to reduce chip loss are made.
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