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Magnesium monophosphate cements derived from diammonium phosphate solutions

Sugama, T. / Kukacka, L.E.

AbstractRapid-setting magnesium monophosphate cementitious materials were prepared by mixing calcined magnesium oxide (MgO) powder with an aqueous solution of diammonium phosphate (ADP) at 24°C. The activation energy for the curing reaction of the cement paste was determined to be 30.29 kcal/mole, and at age 1 hr the compressive strength was ≈900 psi (6.2 MPa). X-ray diffraction studies of the cured cement indicated that the major reaction product was magnesium orthophosphate tetrahydrate [Mg3(PO4)2·4H2O]. Magnesium ammonium phosphate hexahydrate [MgNH4PO4·6H2O] and Mg(OH)2 were also detected. Subsequent heating of the cement to 1300°C resulted in the conversion of the three compounds to a single phase of anhydrous magnesium orthophosphate [Mg3(PO4)2]. The resultant product had a compressive strength of 7000 psi (48.23 MPa) and was thermally stable in air at temperatures >1000°C.

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Magnesium monophosphate cements derived from diammonium phosphate solutions

Sugama, T. / Kukacka, L.E.

AbstractRapid-setting magnesium monophosphate cementitious materials were prepared by mixing calcined magnesium oxide (MgO) powder with an aqueous solution of diammonium phosphate (ADP) at 24°C. The activation energy for the curing reaction of the cement paste was determined to be 30.29 kcal/mole, and at age 1 hr the compressive strength was ≈900 psi (6.2 MPa). X-ray diffraction studies of the cured cement indicated that the major reaction product was magnesium orthophosphate tetrahydrate [Mg3(PO4)2·4H2O]. Magnesium ammonium phosphate hexahydrate [MgNH4PO4·6H2O] and Mg(OH)2 were also detected. Subsequent heating of the cement to 1300°C resulted in the conversion of the three compounds to a single phase of anhydrous magnesium orthophosphate [Mg3(PO4)2]. The resultant product had a compressive strength of 7000 psi (48.23 MPa) and was thermally stable in air at temperatures >1000°C.

Magnesium monophosphate cements derived from diammonium phosphate solutions

Sugama, T. / Kukacka, L.E.

AbstractRapid-setting magnesium monophosphate cementitious materials were prepared by mixing calcined magnesium oxide (MgO) powder with an aqueous solution of diammonium phosphate (ADP) at 24°C. The activation energy for the curing reaction of the cement paste was determined to be 30.29 kcal/mole, and at age 1 hr the compressive strength was ≈900 psi (6.2 MPa). X-ray diffraction studies of the cured cement indicated that the major reaction product was magnesium orthophosphate tetrahydrate [Mg3(PO4)2·4H2O]. Magnesium ammonium phosphate hexahydrate [MgNH4PO4·6H2O] and Mg(OH)2 were also detected. Subsequent heating of the cement to 1300°C resulted in the conversion of the three compounds to a single phase of anhydrous magnesium orthophosphate [Mg3(PO4)2]. The resultant product had a compressive strength of 7000 psi (48.23 MPa) and was thermally stable in air at temperatures >1000°C.

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Title:

Magnesium monophosphate cements derived from diammonium phosphate solutions

Contributors:

Sugama, T. (author) / Kukacka, L.E. (author)

Published in:

Cement and Concrete Research ; 13 ; 407-416

Publication date:

1983-03-01

Size:

10 pages

ISSN:

DOI:

https://doi.org/10.1016/0008-8846(83)90041-8

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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