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

Author(s): C.J. Zega, V.A. Villagrán-Zaccardi, A.A. Di Maio

Publication: RILEM

Volume: 43

Issue: 1

Appears on pages(s): 195-202

Keywords: Natural aggregate, Recycled Aggregate, Absorption, Los Angles Abrasion, Flakiness index, Mortar Content

DOI:

Date: 12/1/2009

Abstract:
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.