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Characterization of Recycled Coarse Aggregate (RCA) via a Surface Coating Method

Title
Characterization of Recycled Coarse Aggregate (RCA) via a Surface Coating Method
Author
유재석
Keywords
recycled coarse aggregate (RCA); polycarboxylate(PC); dispersan coated RCA (CRCA)water reduction ratio, workability
Issue Date
2014-06
Publisher
한국콘크리트학회 Korea Concrete Institute
Citation
International Journal of Concrete Structures and Materials, Vol.8 No.2, pp 165–172
Abstract
Recycled coarse aggregate (RCA) made from waste concrete is not a suitable structural material as it has highabsorption of cement mortar, which adheres on the aggregate surface and on the tiny cracks thereon. Therefore, when using RCAmade from waste concrete, much water must be added with the concrete, and slump loss occurs when transporting. Hence, itsworkability is significantly worse than that of other materials. In this study, surface of RCA was coated with water-solublepolycarboxylate (PC) dispersant so that its characteristics improved. Each possibility was evaluated: whether its slump loss can becontrolled, by measuring its workability based on the elapsed time; and whether it can be used as a structural material, bymeasuring its strength. Moreover, the carbonation due to cement mortar adhesion was measured through a carbonation test. As aresult, RCA coated with PC dispersant was found to be better than crushed coarse aggregate and RCAwhen the physical propertiesof the fresh concrete and the mechanical, durability of the hardened concrete were tested.
URI
https://www.kci.go.kr/kciportal/ci/sereArticleSearch/ciSereArtiView.kci?sereArticleSearchBean.artiId=ART001877007http://hdl.handle.net/20.500.11754/56453
ISSN
1229-5515; 1976-0485
DOI
10.1007/s40069-014-0067-2
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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