Influence of carbonated recycled concrete aggregate on properties of cement mortar

Jiake Zhang, Caijun Shi, Yake Li, Xiaoying Pan, Chi Sun Poon, Zhaobin Xie

Research output: Journal article publicationJournal articleAcademic researchpeer-review

92 Citations (Scopus)

Abstract

This work investigated the effect of carbon dioxide treatment of recycled concrete aggregate (RCA) on the performance of RCA and RCA mortar. The results indicated that carbonation increased the apparent density, and reduced both water absorption and the crushing value of the RCA. The flowability and compressive strength of the RCA mortar were lower than those of natural sand mortar. However, the properties of mortar made with carbon dioxide treated RCA were very similar to those of natural sand mortar. Compared with the mortar made of un-carbonated RCA, the mortar made with carbonated RCA showed increased autogenous shrinkage, reduced drying shrinkage, water absorption, and chloride migration coefficient. Scanning electron microscope (SEM) examination on the interfacial transition zone (ITZ) in the RCA and RCA mortar found that carbonation treatment of RCA not only improved the original ITZ in the RCA, but also improved the newly formed ITZ in the RCA mortar.
Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalConstruction and Building Materials
Volume98
DOIs
Publication statusPublished - 15 Nov 2015

Keywords

  • Carbonation treatment
  • Chloride migration coefficient
  • Microstructure
  • Mortar
  • Recycled concrete aggregate
  • Shrinkage

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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