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Materials and Structures

, Volume 48, Issue 11, pp 3557–3569 | Cite as

Combined experimental methods to assess absorption rate of natural and recycled aggregates

  • A. Z. Bendimerad
  • E. Roziere
  • A. Loukili
Original Article

Abstract

The assessment of maximum water absorption and absorption rate are necessary in order to design concrete mixtures from relatively porous aggregates, such as recycled aggregates. The experimental research presented in this paper investigates and improves the existing procedures for determining water absorption rates. New equations and experimental procedures are proposed to correct the existing procedures. Three types of aggregates were studied. Natural aggregates with two gradations 4–10 and 6.3–20 mm, natural limestone aggregates with gradation 4–20 mm and recycled aggregates with two gradations 4–10 and 10–20 mm. For each granular type, two tests were conducted, the first with oven-dried aggregates and the second with aggregates having initial moisture. Effects of initial moisture state were deduced from the first part of the experimental program. Then existing procedures were combined in order to design new procedures. Finally a method was developed for testing the volume variation of aggregates by hydrostatic weighing; the detailed testing procedure and equations of the new method are illustrated using the natural and recycled aggregates. Results from pycnometer method and hydrostatic weighing showed very good correlation.

Keywords

Water saturation Absorption Recycled aggregate Mix design 

Notes

Acknowledgments

Support from the Agence Nationale de la Recherche (National Research Agency, France) is acknowledged (ECOREB project). The authors would like to thank UNPG (National Association of Aggregate Producers, France) for providing some of the aggregates.

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Copyright information

© RILEM 2014

Authors and Affiliations

  1. 1.Institut de Recherche en Génie Civil et Mécanique (GeM), UMR-CNRS 6183Ecole Centrale de NantesNantesFrance

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