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For hardened concrete, the compressive strength, elastic modulus, flexural strength, and splitting tensile strength showed no clear trend with the substitution of recycled coarse aggregate in the range considered in this study. These properties, however, did show an overall decrease with the substitution of recycled fine aggregate.
Concrete Made with Recycled Aggregate Properties
The recycled aggregates were obtained from a concrete slab identified by the Pavement Management Unit of the North Carolina Department of Transportation (NCDOT). The slab was obtained from Davie County and the material was removed from Interstate 40, Milepost 165, Station 675+00, in the east-bound lane. This location is close to the US 64 exit at the Iredell-Davie County line near Hunting Creek. Information from the NCDOT indicates that Smithgrove, North Carolina was the source of the course aggregate.
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One day before mixing, coarse and fine aggregates were weighed and covered up to prevent either absorption or evaporation of moisture from the air. At this time, representative samples of the aggregates were taken for determination of water content.The concrete mixer was buttered with a mortar consisting of Type I cement and a representative sample of the fine aggregates for the mixture. The mixer was then turned upside down for 1 minute to allow excess water and mortar to drain from the mixer.
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The shape of natural aggregates depends on the strength, abrasion resistance, and on the degree of wear to which they have been subjected in their depositional environment. Natural aggregates tend be more spherical and less angular. On the other hand, the shape of manufactured aggregate depends on the rock type and the crushing equipment. Manufactured aggregates are more angular when compared to natural aggregates.