Preparation of MgO- and CaO-Bearing Expansive Agent Used for Cement-Based Materials

Preparation of MgO- and CaO-Bearing Expansive Agent Used for Cement-Based Materials

Blended expansive agents consisting of MgO and CaO were prepared by calcining the mixtures of dolomite and magnesite. The mineral phases and microstructures of expansive agent were examined by XRD and SEM. The expansion properties of cement pastes containing 5% and 6% of expansive agent as well as t...

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Veröffentlicht in:Key engineering materials 2013-01, Vol.539, p.211-214
Hauptverfasser: Deng, Min, Mo, Li Wu, Deng, Yang, Lu, An Qun
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Blended
Cements
Dolomite
Expansion
Magnesite
Magnesium carbonate
Magnesium oxide
Pastes
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Lu, An Qun
description Blended expansive agents consisting of MgO and CaO were prepared by calcining the mixtures of dolomite and magnesite. The mineral phases and microstructures of expansive agent were examined by XRD and SEM. The expansion properties of cement pastes containing 5% and 6% of expansive agent as well as the microstructure of hydrated expansive agent in cement paste were investigated. Results indicated that the contents of MgO and CaO in the blended expansive agent could be adjusted by changing the mix proportion of dolomite and magnesite. All the cement pastes containing expansive agent produced rapid expansion. At the same addition dosage, irrespective of curing temperature, expansive agent containing higher content of MgO produced greater expansion in cement pastes, particularly at late age, which probably ascribes to the relatively slow hydration of MgO.
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subjects Blended
Cements
Dolomite
Expansion
Magnesite
Magnesium carbonate
Magnesium oxide
Pastes
title Preparation of MgO- and CaO-Bearing Expansive Agent Used for Cement-Based Materials
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