Abstract
Marginal aggregates have been used to a very limited extent in the construction of embankments and highway pavement structures. However, the State of Florida has successfully utilized relatively poor limestones for base course construction. It has been observed that limerock bases increase in strength with ageing. A study of this phenomena revealed that Sparry Calcite cementation and drying during ageing produced strength gains as high as 100 per cent.
Investigations into moisture effects and behavior of a dense graded shale aggregate indicated strength losses due to moisture content fluctuation similar to that of good limestone aggregate. A structural equivalency of 1,4∶1,0 was obtained for shale and limestone base courses.
Résumé
Les granulats marginaux ont rarement été utilisés pour la construction des remblais et des chaussées à l'exception des calcaires marginaux de l'état de la Floride qui sont couramment utilisés comme matériau de fondation. Des études démontrent que la résistance de ces granulats peut doubler dans le temps avec le séchage et ce, grâce à la cimentation calcitique.
Par ailleurs, des études sur l'influence de la variation de la tenuer en eau sur le comportement des schistes concassés denses de la région de Montréal démontrent que la perte de résistance par l'humidité est comparable à celle de bons granulats de calcaire. Un facteur d'équivalence structural de 1,4∶1,0 entre les deux granulats denses est suggéré pour la couche de fondation.
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References
EADES J.L.: “Florida Limerock Cementation Investigation,” Final Report submitted to the Florida Department of Transportation, Department of Geology, University of Florida, 1979.
ZIMPFER W.H.: “Florida Limerock Investigation: Strength Gain Study of High and Low Carbonate Base Materials,” Final Report and submitted to the Florida Department of Transportation, Department of Civil Engineering, University of Florida, 1981.
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Keyser, J.H., Eades, J.L., Ruth, B.E. et al. Marginal aggregates for highway pavements. Bulletin of the International Association of Engineering Geology 30, 425–429 (1984). https://doi.org/10.1007/BF02594355
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DOI: https://doi.org/10.1007/BF02594355