Effect of Limestone Powder on Microstructure of Ternary Cementitious System

Title

Effect of Limestone Powder on Microstructure of Ternary Cementitious System

 Author

Zhang, Y.
Ye, G.

Faculty

Civil Engineering and Geosciences

 Department

Structural Engineering

 Date

2012-12-31

 Abstract

The pressure to reach sustainability favours the development of ternary composite cement. The synergistic effect on mechanical behaviour at 28 days between limestone powder (LP) and pozzolanic additives, i.e. fly ash (FA) and blast furnace slag (BFS), has been documented. In order to better understand the synergistic effect, this article investigated the effect of LP on the microstructure of PC-FA and PC-BFS cementitious system. The mineralogy and pore structure were determined after 28 days of curing at 20°C and 95% relative humidity. The mineralogy in pastes was identified by means of X-Ray diffraction (XRD) and thermogravimetry (TG). The pore structure was evaluated by Mercury intrusion porosimetry (MIP). The results showed that neither monosulfoaluminate nor ettringite was found in any of the XRD patterns, instead carboaluminate was observed. Hemicarboaluminate produced in FA-PC or BFS-PC system transformed into monocarboaluminate with the addition of LP. The porosity was enlarged compared with LP-free paste system. It seems that both the physical and chemical effect of LP contribute to the synergistic effect on mechanical behaviour of cementitious system hydrated up to 28 days.

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 Source

SusCom 2012: 2nd International Conference on Sustainable Construction Materials: Design, Performance and Application, Wuhan, China, 18-22 October 2012

 Part of collection

Institutional Repository

 Document type

conference paper

 Rights

(c) 2012 Zhang, Y.
Ye, G.
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