Effects of limestone powder on CaCO3precipitation in CO2cured cement pastes

Zhenjun Tu, Ming Zhi Guo, Chi Sun Poon, Caijun Shi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

51 Citations (Scopus)

Abstract

The concept of using limestone powder as supplementary materials to accelerate cement hydration has been explored widely. There have also been interests in using CO2curing to enhance the early strength of concretes. This study investigated the effects of incorporating limestone powder on CO2curing of cement-based materials. The results showed that using limestone powder to partially replace cement could significantly increase the CO2curing degree of the cement pastes. QXRD analysis showed that calcite was the major reaction product, accompanied by amorphous calcium carbonate. The mass ratio of poorly crystallized calcium carbonate to highly crystallized calcium carbonate (DC/HC ratio) formed was affected by both the applied CO2pressure and the use of limestone powder. At low pressure, incorporating limestone powder led to an increase in the DC/HC ratio. However, a reversed trend was observed in the case of high CO2pressure.
Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalCement and Concrete Composites
Volume72
DOIs
Publication statusPublished - 1 Sep 2016

Keywords

  • CaCO precipitation 3
  • CO curing 2
  • Limestone powder
  • Microstructure

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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