Every aggressive agent present in the environment surrounding a concrete structure can percolate, diffuse, and penetrate across the pores of the concrete according to transport mechanism laws. This article reports on a study in which fine and coarse recycled aggregates recovered from demolished masonry and concrete structures were utilized in the manufacture of new concrete mixtures. Three properties of these new concretes were then analyzed: water absorption, total pores volume, and carbonation. The recycled concrete families were created by replacing parts of the natural aggregates forming families of concrete with 0%, 20%, 50%, and 100% of aggregates from recycled sources. The results show that the family concrete with the highest pore volume and with the same compressive strength of 20, 30, and 40 MPa (2900, 4350, and 5800 psi) did not always correspond to the concrete family with the highest degree of carbonation. Concrete made with recycled aggregates (20%, 50%, and 100% replacement) from old masonry or from old concrete can have the same fresh workability and can achieve the same compressive strength of concrete made by natural aggregates in the range of 20-40 MPa at 28 days. Some compositional characteristics of concrete could have more influence on the durability that the traditional physical aspects. The authors note that the mix design nomogram (MDN) is a new and useful tool that allows the researchers to compare properties and behaviors of different concretes.

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    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Levy, S M
    • Helene, P
  • Publication Date: 2004-11


  • English

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  • Accession Number: 00986429
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 8 2005 12:00AM