Assessment of mechanical properties of concrete incorporating carbonated recycled concrete aggregates

Dongxing Xuan, Baojian Zhan, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

170 Citations (Scopus)

Abstract

An accelerated carbonation technique was employed to strengthen the quality of recycled concrete aggregates (RCAs) in this study. The properties of the carbonated RCAs and their influence on the mechanical properties of new concrete were then evaluated. Two types of RCAs, an old type of RCAs sourced from demolished old buildings and a new type of RCAs derived from a designed concrete mixture, were used. The chosen RCAs were firstly carbonated for 24 h in a carbonation chamber with a 100% CO2concentration at a pressure level of 0.1 Bar and 5.0 Bar, respectively. The experimental results showed that the properties of RCAs were improved after the carbonation treatment. This resulted in performance enhancement of the new concrete prepared with the carbonated RCAs, especially an obvious increase of the mechanical strengths for the concrete prepared with the 100% carbonated new RCAs. Moreover, the replacement percentage of natural aggregates by the carbonated RCAs can be increased to 60% with an insignificant reduction in the mechanical properties of the new concrete.
Original languageEnglish
Pages (from-to)67-74
Number of pages8
JournalCement and Concrete Composites
Volume65
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Carbonation
  • Mechanical properties
  • Recycled aggregate concrete
  • Recycled concrete aggregates

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

Cite this