Early carbonation curing of concrete masonry units with Portland limestone cement

Hilal El-Hassan, Yixin Shao

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

Abstract The effect of carbonation curing on the mechanical properties and microstructure of concrete masonry units (CMU) with Portland limestone cement (PLC) as binder was examined. Slab samples, representing the web of a CMU, were initially cured at 25°C and 50% relative humidity for durations up to 18 h. Carbonation was then carried out for 4 h in a chamber at a pressure of 0.1 MPa. Based on Portland limestone cement content, CO2 uptake of PLC concrete after 18 h of initial curing reached 18%. Carbonated and hydrated concretes showed comparable compressive strength at both early and late ages due to the 18-h initial curing. Carbonation reaction converted early hydration products to a crystalline microstructure and subsequent hydration transformed amorphous carbonates into more crystalline calcite. Portland limestone cement could replace Ordinary Portland Cement (OPC) in making equivalent CMUs which have shown similar carbon sequestration potential.

Original languageEnglish
Article number2526
Pages (from-to)168-177
Number of pages10
JournalCement and Concrete Composites
Volume62
DOIs
Publication statusPublished - Aug 3 2015
Externally publishedYes

Keywords

  • CMU
  • CO<inf>2</inf> uptake
  • Compressive strength
  • Curing
  • Microstructure
  • PLC

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Early carbonation curing of concrete masonry units with Portland limestone cement'. Together they form a unique fingerprint.

Cite this