Effect of Admixed Recycled Aggregate Concrete on Properties of Fresh and Hardened Concrete

• Published in: Journal of materials in civil engineering Vol. 24; no. 4; pp. 494 - 498
• Main Authors: Kumar, P. Saravana, Dhinakaran, G
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01-04-2012
• Subjects: Aggregates; Aggregates and other concrete constituents; Applied sciences; Buildings. Public works; Cement concrete constituents; Compressive strength; Concrete industry; Concretes; Concretes. Mortars. Grouts; Exact sciences and technology; Fly ash; General (composition, classification, performance, standards, patents, etc.); Hardening; Materials; Mixes; Plasticizers; Recovery materials; Technical Note; Technical Notes; Admixed concrete; Recycled aggregate; Fresh aggregate; Construction materials; Reuse; Concrete mix design; Concrete workability; Compressive strength; Fresh concrete; Recycled aggregate concrete (RAC); Fly ash; Aggregates; Fresh aggregate concrete (FAC); Admixture(concrete); Properties of materials; Hardened concrete; Recycled material; Recycling; Concrete admixtures; Aggregate(materials); Material properties
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000393

AbstractRecycled aggregate (RA) obtained from crushed concrete rubble, instead of being stored, can be reused in building industry. An attempt has been made to study the possibility of reusing the recycled concrete aggregate from demolished structures in the place of fresh aggregate. Four series of mixes of control concrete with fresh aggregate and recycled concrete aggregate with three different ages of 5, 10, and 15 years were prepared for the present study and used with three different combinations, 0% fly ash, 20% fly ash, and 20% fly ash with super plasticizer. The basic properties of aggregates, such as water absorption and specific gravity, mechanical properties, such as abrasion resistance, effect, and crushing values were considered. Workability of fresh concrete and strength parameters of hardened concrete, such as compressive strength and tensile strength, were studied. The preceding properties were tested for three different periods of curing of 7, 14, and 28 days. All these mixes were designed for M25 grade of concrete. In the present work, a comparison was made between the results of a laboratory investigation on various physical properties of concrete made with recycled aggregate concrete with fresh aggregate concrete and found that the results are encouraging to use concrete with RA.