Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Application of Accelerated Carbonation Reaction for Low Alkalinity of Recycled Aggregate

  • Lee, Jong-Chan (Building Structure & Resources Research Division, KICT) ;
  • Lee, Sae-Hyun (Building Structure & Resources Research Division, KICT) ;
  • Yoon, Sang-Hyuck (Building Structure & Resources Research Division, KICT) ;
  • Song, Tae-Hyeob (Building Structure & Resources Research Division, KICT)
  • Received : 2011.07.14
  • Accepted : 2011.08.31
  • Published : 2011.10.20
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Abstract

As Construction and Demolition (C&D) debris increases every year, systems have been adopted to compel the use of recycled aggregate made from C&D debris, and the use of recycled aggregate in the construction field has increased. But environmental problems linked to the alkalinity of recycled aggregate have occurred, and a study on approaches to lower the alkalinity of recycled aggregate is needed. It was certified by this study that a large amount of recycled aggregate could be carbonated in the C&D debris midterm-treatment field. As a result, the density and the water absorption of recycled aggregate after carbonation reaction was improved, and pH of recycled aggregate was lowered from over 11 to 9.4. X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), and Thermogravimetry/Differential Thermal Analysis (TG/DTA) methods also indicated the carbonation of recycled aggregate.

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References

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