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Investigations on Phosphate Cements Hardening at Room Temperature

Published online by Cambridge University Press:  21 February 2011

Alfred Zurz ,
I. Odler  and
B. Dettki
Alfred Zurz
Affiliation:
Technical University Clausthal, Institute of Nonmetallic Materials, ZehntnerstraBde 2A, D-3392 Clausthal-Zellerfeld, Federal Republic of Germany
I. Odler
Affiliation:
Technical University Clausthal, Institute of Nonmetallic Materials, ZehntnerstraBde 2A, D-3392 Clausthal-Zellerfeld, Federal Republic of Germany
B. Dettki
Affiliation:
Technical University Clausthal, Institute of Nonmetallic Materials, ZehntnerstraBde 2A, D-3392 Clausthal-Zellerfeld, Federal Republic of Germany
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Abstract

Pastes prepared from diammonium orthophosphate and calcined magnesia, MgO, exhibit a fast setting and hardening associated with NH3 liberation. Struvite, MgNH4PO4.6H2O, was found to be the main reaction product. Pastes made with NaH2PO4 or Na-polyphosphate exhibit a similar hardening reaction. The hardening reaction may be retarded and the ultimate strength moderately increased by adding appropriate retarders, such as Na2B4O7 10H2O to the system. The quality of the used MgO and its fineness has a significant effect on the rate of the hardening reaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 179: Symposium Y – Specialty Cements with Advanced Properties , 1989 , 69
Copyright
Copyright © Materials Research Society 1991

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