Durability of recycled aggregate concrete prepared with carbonated recycled concrete aggregates

Dongxing Xuan, Baojian Zhan, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

117 Citations (Scopus)

Abstract

However, the durability of RAC prepared with carbonated RCAs remains to be accessed. In this study, the durability properties of RAC prepared with non-carbonated RCAs and carbonated RCAs, in terms of deformation (drying shrinkage), water absorption and permeability (bulk electrical conductivity, gas and chloride ion permeability), are presented. The experimental results indicated that: (i) the incorporation of the carbonated RCAs in RAC not only helped to reduce the water absorption of RAC, but also reduced its permeability; (ii) when 100% carbonated NRCAs was used, the improvement extent of impermeability was 15.1%, 36.4% and 42.4% for bulk electrical conductivity, chloride ion permeability and gas permeability, respectively. Comparing the results of the mechanical and durability properties, the CO2curing treatment of RCAs had a greater beneficial impact on the durability properties of the RAC; and (iii) there was a good correlation between the water absorption of RAC and its permeability indicators. The water absorption value of RAC may be used as a criterion of the durability of RAC.
Original languageEnglish
Pages (from-to)214-221
Number of pages8
JournalCement and Concrete Composites
Volume84
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • Carbonation treatment
  • Durability
  • Permeability
  • Recycled aggregate concrete
  • Recycled concrete aggregates

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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