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Progress in the study of New Zealand aggregates

  • Barneveld J. H. Van 
  • Bartley F. G. 
  • Dunlop R. J. 
International Symposium on Aggregates Theme IV Aggregates for Pavements

Abstract

Granular roadbases with surfacings of bitumen and crushed aggregate chippings can be used to sustain loadings in excess of 2×106 equivalent 8 tonne axles.

Geological and petrological skills suited to predicting the behaviour of lesser quality aggregates have been developed and the effect of water and fine particles on stability and elastic deformation have been studied.

Full scale pavement test strips and a 19 m diameter circular test track have been used for performance monitoring of unbound roadbase aggregates.

The refinement of aggregate selection criteria and fundamental concepts related to aggregate behaviour are continuing.

Keywords

Bitumen Test Section Greywacke Aggregate Resource Crushed Aggregate 

Progres dans l'etude des granulats en Nouvelle Zelande

Résumé

Des couches de base composées de granulats non traités revêtues d'un enduit à gravillons de roches concassées peuvent être utilisées pour supporter des charges dépassant 2×106 essieux de 8 tonnes équivalents.

Des méthodes d'étude pétrographiques permettant la prévision du comportement des granulats de moindre qualité ont été mises au point, et l'action de l'eau et des fines sur la stabilité et la déformation réversible a été étudiée.

L'utilisation de planches expérimentales grandeur nature et d'un manège de 19 m de diamètre a permis un contrôle des performances des granulats sans liant de la couche de base.

Le perfectionnement des critères de sélection et des notions fondamentales relatives au comportement des granulats se poursuit à l'heure actuelle.

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Copyright information

© International Association of Engineering Geology 1984

Authors and Affiliations

  • Barneveld J. H. Van 
    • 1
  • Bartley F. G. 
  • Dunlop R. J. 
  1. 1.Technical Secretary Pavements CommitteeNational Roads BoardWellington NorthNew Zealand

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