Properties of Recycled Aggregate Concretes as Affected by Admixtures in Original Concretes

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Title: Properties of Recycled Aggregate Concretes as Affected by Admixtures in Original Concretes

Author(s): Torben C. Hansen and Soren E. Hedegkd

Publication: Journal Proceedings

Volume: 81

Issue: 1

Appears on pages(s): 21-26

Keywords: mixtures; accelerating agents; aggregates; air-entraining agents; air entrainment;compressive strength; corrosion; deicers; crushed concrete;reinforcing steels; retardants; setting (hardening).

Date: 1/1/1984

Abstract:
Experimental results are reported that show that addition of a plasticizing, an air entraining, a retarding, and an acclerating admixture to original concretes had little or no effect on the properties of new concretes produced from recycled aggregates obtained by the crushing of original concretes. When four percent of water-free calcium cholride, corresponding to 2.56percent of soluble chloride ion by the weight of cement, was added to an original concrete to simulate the accumulated deicing salts, the chloride content of a correled concrete exceeded current ACI 201.2R-77 limits for concrete prior to service exposure.