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Assessment of a microgranite source rock for use in concrete

  • Shayan A. 
  • Lancucki C. J. 
  • Way S. J. 
International Symposium on Aggregates Theme 3. Tests on Aggregates

Abstract

A microgranite, showing varying degrees of weathering with depth, has been investigated as a source of concrete aggregate for dam construction. Diamond drilled cores and percussion drilled samples, taken to 40 m depth, were used for mineralogical, petrological, and methylene blue dye adsorption (MBA) studies and for measurement of drying shrinkage in order to assess the influence of deleterious secondary minerals, largely swelling clays, on the dimensional stability of the rock.

A highly significant correlation between MBA and drying shrinkage indicated that samples which had MBA values less than 1.5 mL/g would produce concrete shrinkages acceptable for structural purposes.

Keywords

Shrinkage Source Rock Percussion Drilling Structural Purpose Methylene Blue Adsorption 

Evaluation d'une roche mere microgranitique par rapport a son emploi dans la fabrication de beton

Résumé

On a examiné un microgranite aux degrés d'altération climatique variant en fonction de la profondeur par rapport à l'emploi de celui-ci dans la production de granulats à béton destiné à être utilisé dans la construction de barrages. On a fait sur des carottes obtenues au moyen d'une foreuse à couronne diamantée et sur des échantillons produits par des forages à percussion, pris jusqu'à une profondeur de 40 m, des études minéralogiques, pétrologiques et d'adsorption du colorant bleu de méthylène (ABM), ainsi que des mesures du retrait au séchage, afin d'évaluer l'influence des minéraux secondaires délétères, pour la plupart des argiles gonflantes, sur la stabilité dimensionnelle de la roche.

Une corrélation hautement significative entre l'ABM et le retrait au séchage indiquait que les échantillons qui avaient des valeurs d'ABM de moins de 1,5 mL/g donneraient des retraits du béton qui seraient admissibles pour la construction.

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References

  1. BUILDING RESEARCH STATION. (1963): Shrinkage of natural aggregates in concrete. Digest 35.Google Scholar
  2. COLE W.F. (1979): Dimensionally unstable grey basalt. Cement and Concrete Research 9, 425–430.CrossRefGoogle Scholar
  3. COLE W.F., LANCUCKI C.J. and SANDY M.J. (1981): Products formed in an aged concrete. Cement and Concrete Research 11, 443–454.CrossRefGoogle Scholar
  4. COLE W.F. and BERESFORD F.D. (1980): Influence of basalt aggregate on concrete durability. ASTM, Special Technical Publication 691, 617–628.Google Scholar
  5. FAIRBAIRN P.E. and ROBERTSON R.H.S. (1957): Liqid limit and dye adsorption. Clay Minerals Bulletin 3, 129–136.CrossRefGoogle Scholar
  6. HOBBS D.W. (1974): Influence of aggregate restraint on the shrinkage of concrete. ACI Journal 71, 445–450.Google Scholar
  7. JONES F.O. (1964): New, fast accurate test measurement of bentonite in drilling mud. Oil and Gas Journal 1, 76–78.Google Scholar
  8. ROPER H. (1960): Volume changes of concrete affected by aggregate type. Journal of the PCA Research and Development Laboratories 2, 13–19.Google Scholar
  9. SAMESHIMA T., BLACK P.M. and HEMING R.F. (1978): Hydrochemical degradation of greywacke road aggregate. Australian Road Research Board, Proceedings 9 (15) 21–26.Google Scholar
  10. SNOWDON L.C. and Edwards A.G. (1962): The moisture movement of natural aggregate and its effect on concrete. Magazine of Concrete Research 14, 109–116.CrossRefGoogle Scholar
  11. STUTTERHEIM N. (1960): Deterioration of concrete in hot dry regions due to excessive shrinkage of aggregates. International symposium on concrete and reinforced concrete in hot countries. Israel.Google Scholar

Copyright information

© International Association of Engineering Geology 1984

Authors and Affiliations

  • Shayan A. 
  • Lancucki C. J. 
  • Way S. J. 
    • 1
  1. 1.CSIRO Division of Building ResearchMelbourneHighettAustralia

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