Enhancing mechanical and durability properties of recycled aggregate concrete. (15th January 2018)

• Record Type: Journal Article
• Authors: Dimitriou, George; Savva, Pericles; Petrou, Michael F.
• Is Part Of: Construction & building materials. Volume 158(2018)
• Page Start: 228
• Page End: 235
• Publication Date: 2018-01-15
• Subjects: Adhered mortar -- Treatment method -- Mineral admixtures -- Recycled concrete aggregate -- Recycled aggregate concrete -- Internal curing; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.09.137
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Different methods were used to improve the quality of recycled aggregate concrete. A treatment method was applied on recycled aggregates to remove adhered mortar. Treated and non-treated recycled aggregate mixtures were compared with Control. Mineral admixtures were employed to improve recycled aggregate concrete quality. Internal curing methodology was tested using recycled aggregates. Recycled aggregate concrete quality was improved using the proposed methodologies. Abstract: The main difference between Recycled Concrete Aggregate (RCA) and Natural Aggregate (NA) is the mortar adhered on RCA. This paper presents the effect of RCA to concrete and a treatment method utilized to improve the properties of RCA, by reducing the amount of the adhered mortar, and therefore the properties of the Recycled Aggregate Concrete (RAC). Mineral admixtures were used as partial replacement of cement. Three types of coarse RCA and two types of mineral admixtures were used (fly ash and silica fume). In addition, the RCA were employed as internal curing (IC) agents in concrete mixtures to assess their effectiveness in enhancing the properties of concrete. The mechanical properties and durability of RAC were improved using the proposed methodologies. Cost analysis showed that RAC mixtures could be less expensive than NA mixtures.