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Study on Iraqi limestone aggregates in bituminous mixes

  • Subbash C. Saxena
  • Faris F. Khalid
International Symposium on Aggregates Theme IV Aggregates for Pavements
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Abstract

In North Iraq, there are two major sources of crushed stone aggregates, the Darbandibazian source of limestones and the Kalachwalan source. Limestones are generally not used in bituminous mixes as they are considered weak and unsuitable.

In this study, these two available sources of crushed stone aggregates are rationally analysed for their engineering properties and suitability for use in bituminous mixes.

It was observed that limestones do meet the Marshall test requirements of a bituminous mix and can be used satisfactorily, with slightly higher percentage of bitumen. Huge amount of locally available limestones thus have a potential for use.

Keywords

Asphalt Bitumen Iraq Asphalt Mixture Limestone Aggregate 

Etude sur les granulats calcaires en melanges bitumineux Irak

Résumé

En Irak du Nord il y a deux principales sources de granulats concassés: les calcaires du Darbandibazian et du Kalachwalan. D'habitude les calcaires ne sont pas employés dans les mélanges bitumineux car on les trouve insuffisamment durs et peu appropriés.

Dans cette étude, ces deux sources de granulats concassés sont analysées de façon rationnelle en ce qui concerne leurs propriétés en génie civil et leur emploi possible en mélanges bitumineux.

Il a été remarqué que les calcaires remplissent les conditions du test Marshall sur les mélanges bitumineux et peuvent être utilisés de façon satisfaisante avec un pourcentage de bitume légèrement supérieur. Les abondants dépots de calcaires accessibles localement peuvent donc être utilisés.

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References

  1. [1]
    BENSON J.R. (1970): “Effect of Aggregate size, shape and surface texture on the properties of Bituminous mixtures”, Special report No. 109, Highway Research Board, U.S.A. pp. 12–22.Google Scholar
  2. [2]
    BRITISH STANDARD INSTITUTION, (1970): “Method of sampling and testing aggregates, sands and fillers”, B.S.812, London pp. 10–30.Google Scholar
  3. [3]
    MONISMITH C.L. (1970): “Influence of shape, size and surface texture on stiffness and fatigue response of asphalt mixtures”, Highway Research Board, Special report No. 109, pp. 4–11.Google Scholar
  4. [4]
    WALLACE, H.A. and MARTIN J.R. (1967): “Asphalt Pavement Engineering” McGraw Hill Co. U.S.A. pp. 64–82.Google Scholar

Copyright information

© International Association of Engineering Geology 1984

Authors and Affiliations

  • Subbash C. Saxena
    • 1
  • Faris F. Khalid
    • 2
  1. 1.Department of Civil EngineeringUniversity of MalayaKuala LumpurMalaysia
  2. 2.University of SulaimaniaSulaimaniaIraq

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