Effect of natural coarse aggregate type on the physical and mechanical properties of recycled coarse aggregates

Many environmental problems caused by the large volumes of construction and demolition waste (C&DW), the lack of adequate deposition sites and the shortage of natural resources have led to the use of C&DW as replacement of natural aggregates in the production of new concrete. As in the case...

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Bibliographic Details
Published in:Materials and structures 2010, Vol.43 (1-2), p.195-202
Main Authors: Zega, C. J., Villagrán-Zaccardi, Y. A., Di Maio, A. A.
Format: Article
Language:English
Subjects:
Aggregates
Aggregates and other concrete constituents
Applied sciences
Building construction
Building Materials
Buildings. Public works
Cement concrete constituents
Civil Engineering
Compressive strength
Concretes
Engineering
Exact sciences and technology
Machines
Manufacturing
Materials
Materials Science
Mechanical properties
Natural aggregates
Natural resources
Original Article
Processes
Recycled
Solid Mechanics
Surface layer
Texture
Theoretical and Applied Mechanics
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Summary:Many environmental problems caused by the large volumes of construction and demolition waste (C&DW), the lack of adequate deposition sites and the shortage of natural resources have led to the use of C&DW as replacement of natural aggregates in the production of new concrete. As in the case of natural aggregates, when recycled aggregates are used to manufacture structural concrete, the assessment of their physical, mechanical and durable characteristics is a key issue. The different physical and mechanical properties of the recycled coarse aggregate (RCA) are evaluated. RCA was obtained by crushing conventional concretes with different strength levels (different w/c ratios) containing four different types of natural coarse aggregates (three crushed stones and a siliceous gravel), which differ in shape, composition and surface texture. There is a significant influence of the natural coarse aggregate (NCA) on the properties of RCA, which in many cases is greater than that of the w/c ratio of the source concrete.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-009-9480-4