New Applications of Magnesium Phosphate Cements Magnesium Phosphate Cements

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Title: New Applications of Magnesium Phosphate Cements Magnesium Phosphate Cements

Author(s): J. P&a and J. Ambroise

Publication: Special Publication

Volume: 179

Issue:

Appears on pages(s): 39-52

Keywords: aging; composites; ductility; durability; repairs; toughness

Date: 6/1/1998

Abstract:
Magnesium-phosphate cements, which exhibit fast setting and high early strength, are already used for rapid repairs to damaged concrete. The present paper describes two new applications of them. The first application deals with the development of composites. Magnesium-phosphate cements are typically brittle in nature but their ductility can be significantly improved by addition of fibers. Composites were prepared according to the premix method, the matrix being composed of 50 % of magnesium-phosphate cement and 50 % of sand. Various fibers were used to reinforce the composites, the fiber volume fraction was in the range of 0.69 % to 1.32 %. Very ductile composites were obtained using polypropylene fibers. When subjected to accelerated aging, these composites maintained their initial performances. The second new application of magnesium-phosphate cements concerns the production of durable grouts. Composed of 50 % of magnesium-phosphate cement and 50 % class F fly ash, such grouts behaved well in severe environments like ammonium sulfate, and lactic acid.