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A method for making a cementitious material comprises forming a mixture of water and active ingredients consisting essentially of i) a compound capable of providing, in aqueous solution, magnesium ions, ii) a potassium phosphate compound and iii) optionally an additional phosphate source; wherein fo

A method for making a cementitious material comprises forming a mixture of water and active ingredients consisting essentially of i) a compound capable of providing, in aqueous solution, magnesium ions, ii) a potassium phosphate compound and iii) optionally an additional phosphate source; wherein forming said mixture is substantially in the absence of ammonia or an ammonium ion containing compound. A method for repairing a flaw in a cementitious structure comprises applying to the flaw the cementitious binder thus prepared.

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[ What is claimed is:] [1.] A method for making a cementitious material comprising:forming a mixture of water and active ingredients consisting essentially of i) a magnesium compound capable of providing, in aqueous solution, magnesium ions, ii) a potassium phosphate compound capable of providing ph

[ What is claimed is:] [1.] A method for making a cementitious material comprising:forming a mixture of water and active ingredients consisting essentially of i) a magnesium compound capable of providing, in aqueous solution, magnesium ions, ii) a potassium phosphate compound capable of providing phosphorous pentoxide, wherein the weight ratio of the magnesium compound to the phosphorous pentoxide from the potassium phosphate compound is from about 0.25 to less than 1, iii) optionally an additional phosphate source; and iv) optionally a retarder; wherein forming said mixture is in the absence of ammonia or an ammonium ion containing compound.