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Durability assessment of crush rock road base

  • Smith Robert Brian
International Symposium on Aggregates Theme 3. Tests on Aggregates
  • 41 Downloads

Abstract

Crushed rock road base derived from either volcanic breccia or dolerite is used extensively in the Syndey Metropolitan area. At present three methods of pretreatment of part of a sample are specified by the Department of Main Roads to predict material breakdown during construction. In addition the dry/wet strength variation is measured to determine material durability. This testing is based on the 10% Fines Test procedure. This paper describes an investigation carried out to ascertain whether the three methods of pretreatment are, indeed, necessary with volcanic breccia and to determine the relationship between the effects of various methods of pretreatment and the aggregate strength parameters.

Keywords

Breccia Main Road Liquid Limit Plasticity Index Plastic Limit 

Evaluation de la durabilite des granulats utilises en couche d'assise routiere

Résumé

Les granulats provenant soit de brèches volcaniques soit de dolérites sont largement utilisés pour les couches d'assise routières dans la Zone Métropolitaine de Sydney. En vue de prévoir la désagrégation pendant la mise en œuvre, le Service des Routes Principales (Department of Main Roads) spécifie à présent, pour une partie des échantillons, un pré-traitement à l'aide de trois méthodes.

En outre, les variations de résistances sèche/humide après 24 heures de trempage sont également mesurées pour déterminer la durabilité du matériau. Ces essais sont basés sur la méthode standard “Dix Pour Cent de Fines”.

Ce document décrit une étude effectuée pour vérifier si les trois méthodes de pré-traitement sont bien réellement nécessaires lorsqu'il s'agit de brèches et pour déterminer la relation entre les effets des différentes méthodes de pré-traitement et les paramètres de résistance des granulats.

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References

  1. DAVIDSON W.H. (1972): “The influence of constitution on the engineering properties of crushed rock.” Proc. Australian Road Research Board, Vol. 6 (5), 71–90.Google Scholar
  2. DEPARTMENT OF MAIN ROADS NSW (1975): Materials Testing Manual Volume 1 Aggregates Soil Concrete. Sydney: Department of Main Roads;Google Scholar
  3. DEPARTMENT OF MAIN ROADS NSW (1975): Main Road Form No. 744: Specification for the supply of natural gravel or crushed rock for road pavement;Google Scholar
  4. DEPARTMENT OF MAIN ROADS NSW (1982): Test Method T215: Wet/Dry Strength Variation.Google Scholar
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Copyright information

© International Association of Engineering Geology 1984

Authors and Affiliations

  • Smith Robert Brian
    • 1
  1. 1.Department of Main RoadsNSWParramattaAustralia

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