Magnesium phosphate glass cements with ceramic-type properties

Patent · Mon Mar 12 23:00:00 EST 1984

OSTI ID:864909

Sugama, Toshifumi ^[1]; Kukacka, Lawrence E ^[2]

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1. Mastic Beach, NY
2. Port Jefferson, NY

Rapid setting magnesium phosphate (Mg glass) cementitious materials consisting of magnesium phosphate cement paste, polyborax and water-saturated aggregate exhibiting rapid setting and high early strength characteristics. The magnesium glass cement is prepared from a cation-leachable powder and a bivalent metallic ion-accepting liquid such as an aqueous solution of diammonium phosphate and ammonium polyphosphate. The cation-leachable powder includes a mixture of two different magnesium oxide powders processed and sized differently which when mixed with the bivalent metallic ion-accepting liquid provides the magnesium glass cement consisting primarily of magnesium ortho phosphate tetrahydrate, with magnesium hydroxide and magnesium ammonium phosphate hexahydrate also present. The polyborax serves as a set-retarder. The resulting magnesium mono- and polyphosphate cements are particularly suitable for use as a cementing matrix in rapid repair systems for deteriorated concrete structures as well as construction materials and surface coatings for fireproof structures.

• Research Organization: ASSOC UNIVERSITIES INC
• DOE Contract Number: AC02-76CH00016
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4436555
• Application Number: 06/422,510
• OSTI ID: 864909
• Country of Publication: United States
• Language: English

Related Subjects

/106/501/
aggregate
air systems
ammonium
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aqueous
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bivalent
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cation-leachable
cement
cementing
cementitious
cementitious material
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ceramic-type
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concrete
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ortho
oxide
oxide powder
oxide powders
particularly
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paste
phosphate
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polyborax
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primarily
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rapid
rapid setting
repair
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