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Characteristics of magnesium polyphosphate cements derived from ammonium polyphosphate solutions
AbstractMagnesium polyphosphate cement pastes prepared by mixing MgO powder and ammonium polyphosphate (AmPP) solutions yielded early strengths of 2000 psi (13.78 MPa) at an age of 1 hr. The major reaction products responsible for the initial strength development at room temperature were found to be ternary phases of NH4MgPO4·6H2O and Mg3(PO4)2·4H2O. The former exhibited morphological features resembling interlocking crystals composed of thin plates ∼ 7 μm in length.The use of sodium tetraborate decahydrate (borax) as an additive to reduce the rate of reaction between MgO and AmPP was demonstrated. The inclusion of 20% borax by weight of AmPP extended the reaction time to 20 min, compared with a reaction time of <3 min for specimens without borax.
Characteristics of magnesium polyphosphate cements derived from ammonium polyphosphate solutions
AbstractMagnesium polyphosphate cement pastes prepared by mixing MgO powder and ammonium polyphosphate (AmPP) solutions yielded early strengths of 2000 psi (13.78 MPa) at an age of 1 hr. The major reaction products responsible for the initial strength development at room temperature were found to be ternary phases of NH4MgPO4·6H2O and Mg3(PO4)2·4H2O. The former exhibited morphological features resembling interlocking crystals composed of thin plates ∼ 7 μm in length.The use of sodium tetraborate decahydrate (borax) as an additive to reduce the rate of reaction between MgO and AmPP was demonstrated. The inclusion of 20% borax by weight of AmPP extended the reaction time to 20 min, compared with a reaction time of <3 min for specimens without borax.
Characteristics of magnesium polyphosphate cements derived from ammonium polyphosphate solutions
Sugama, T. (author) / Kukacka, L.E. (author)
Cement and Concrete Research ; 13 ; 499-506
1983-03-01
8 pages
Article (Journal)
Electronic Resource
English
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