Accelerated Carbonation of Portland Limestone Cement

Accelerated carbonation is a process in which carbon dioxide (CO2) is intentionally introduced to concrete at an early age for a short period of time to promote rapid strength gain. The accelerated carbonation of portland limestone cement (PLC) was studied to examine the possibility of replacing ordinary portland cement (OPC) by PLC in carbonation curing of precast concrete products. Carbonation behavior was characterized by strength gain, CO2 uptake, pH change, XRD, TG, SEM, FTIR, and Si29 NMR spectroscopy. It was found that PLC was a CO2 reactive material. Its CO2 uptake reached 12% based on dry cement mass. In reference to hydrated PLC, the strength of carbonated PLC was 79% higher at 20 h and of close value at 28 days, even though the ultimate CaCO3 content in carbonated PLC was over 40%. The calcium carbonates produced by accelerated carbonation were found to be imbedded in calcium silicate hydrates, forming an intermingled microstructure. The high carbonation reactivity of PLC was possibly attributed to its fine particle size and the existence of limestone powder nuclei for calcium carbonate precipitation. The use of PLC in accelerated carbonation of concrete products can significantly contribute to a net gain in carbon emission reduction.

• Record URL:
  • https://doi.org/10.1061/(ASCE)MT.1943-5533.0000773
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • Copyright © 2014 American Society of Civil Engineers.
• Authors:
  • Shao, Yixin
  • Rostami, Vahid
  • He, Zhen
  • Boyd, Andrew J
• Publication Date: 2014-1

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 117-124
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 26
  • Issue Number: 1
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Calcium carbonate; Carbon dioxide; Carbonation; Curing agents; Limestone; Microstructure; Portland cement
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01501833
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Dec 23 2013 7:52AM