Performance enhancement of recycled concrete aggregates through carbonation

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

159 Citations (Scopus)

Abstract

The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, CO2reacted with Ca(OH)2and calcium silicate hydrate (C-S-H) to form CaCO3and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.
Original languageEnglish
Article number04015029
JournalJournal of Materials in Civil Engineering
Volume27
Issue number11
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Carbonation treatment
  • Mechanical properties
  • Physical properties
  • Recycled concrete aggregate

ASJC Scopus subject areas

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

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