Effects of limestone powder on CaCO3precipitation in CO2cured cement pastes

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

doi:10.1016/j.cemconcomp.2016.05.019

Effects of limestone powder on CaCO₃precipitation in CO₂cured cement pastes

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

Research output: Journal article publication › Journal article › Academic research › peer-review

130 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 language	English
Pages (from-to)	9-16
Number of pages	8
Journal	Cement and Concrete Composites
Volume	72
DOIs	https://doi.org/10.1016/j.cemconcomp.2016.05.019
Publication status	Published - 1 Sept 2016

Keywords

CaCO precipitation 3
CO curing 2
Limestone powder
Microstructure

ASJC Scopus subject areas

Building and Construction
General Materials Science

More information

10.1016/j.cemconcomp.2016.05.019

Cite this

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title = "Effects of limestone powder on CaCO3precipitation in CO2cured cement pastes",

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.",

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AU - Tu, Zhenjun

AU - Guo, Ming Zhi

AU - Poon, Chi Sun

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AB - 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.

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