Strength of Recycled Concrete Made From Crushed Concrete Coarse Aggregate

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Title: Strength of Recycled Concrete Made From Crushed Concrete Coarse Aggregate

Author(s): Torben C. Hansen and Henrik Narud

Publication: Concrete International

Volume: 5

Issue: 1

Appears on pages(s): 79-83

Keywords: aggregate gradation; coarse aggregates; compressive strength; crushed concrete; fresh con-cretes; hardened concretes; mortars (material); recycling; water-cement ratio; workability.

Date: 1/1/1983

Abstract:
Compressive strength of hardened concretes made from recycled concrete coarse aggregates was studied as a function Of the compressive strength of original concretes from which the coarse aggregates were derived Also studied were properties of fresh concretes made from recycled aggregates, gradings of crusher products, properties of recycled aggregates, and the amount of old mortar that remains attached to various grades and size fractions of recycled aggregate. it was found that the compressive strength of recycled concrete is largely controlled by the watercement ratio of the original concrete when other factors are essentially identical. If the water-cement ratio of the original concrete is the same as or lower than that of the recycled concrete, the new strengths will be as good as or better than the original strengths and vice versa.