International Journal of Concrete Structures and Materials

  • 제8권2호
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  • Pages.165-172
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  • 2014
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  • 1976-0485(pISSN)
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  • 2234-1315(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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DOI QR코드

DOI QR Code

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

  • Ryou, J.S. (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Lee, Y.S. (Department of Civil and Environmental Engineering, Hanyang University)
  • 투고 : 2013.03.05
  • 심사 : 2014.01.01
  • 발행 : 2014.06.30
⟨ 이전 논문 다음 논문 ⟩

초록

Recycled coarse aggregate (RCA) made from waste concrete is not a suitable structural material as it has high absorption of cement mortar, which adheres on the aggregate surface and on the tiny cracks thereon. Therefore, when using RCA made from waste concrete, much water must be added with the concrete, and slump loss occurs when transporting. Hence, its workability is significantly worse than that of other materials. In this study, surface of RCA was coated with water-soluble polycarboxylate (PC) dispersant so that its characteristics improved. Each possibility was evaluated: whether its slump loss can be controlled, by measuring its workability based on the elapsed time; and whether it can be used as a structural material, by measuring its strength. Moreover, the carbonation due to cement mortar adhesion was measured through a carbonation test. As a result, RCA coated with PC dispersant was found to be better than crushed coarse aggregate and RCA when the physical properties of the fresh concrete and the mechanical, durability of the hardened concrete were tested.

키워드

참고문헌

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  10. Mechanical Behavior of Recycled Fine Aggregate Concrete with High Slump Property in Normal- and High-Strength vol.13, pp.1, 2014, https://doi.org/10.1186/s40069-019-0372-x
  11. Recycled Concrete Aggregate for Medium-Quality Structural Concrete vol.14, pp.16, 2014, https://doi.org/10.3390/ma14164612
  12. A importância da segregação do agregado reciclado na resistência e na durabilidade do concreto estrutural vol.21, pp.3, 2021, https://doi.org/10.1590/s1678-86212021000300545