The present invention pertains to a use of
sodium polyphosphate, preferably selected from the group consisting of
sodium tripolyphosphate (STPP, Na5P3O10),
sodium hexametaphosphate (SHMP, Na6P6O18),
sodium trimetaphosphate (STMP, Na3P3O9),
sodium metaphosphate (SMP, NaPO3) and mixtures thereof, in an inorganic
mortar system for a chemical fastening of anchors and post-installed reinforcing bars in mineral substrates, comprising a curable aluminous
cement component A and an initiator component B for initiating the curing process. Component A comprises a
calcium aluminate cement, at least one blocking agent selected from the group consisting of
boric acid,
phosphoric acid,
metaphosphoric acid,
phosphorous acid and phosphonic acids and water, and component B comprises an activator and water. Moreover, the present invention pertains to a use of sodium
polyphosphate, preferably selected from the group consisting of sodium tripolyphosphate (STPP, Na5P3O10),
sodium hexametaphosphate (SHMP, Na6P6O18),
sodium trimetaphosphate (STMP, Na3P3O9),
sodium metaphosphate (SMP, NaPO3) and mixtures thereof, in an inorganic
mortar to accelerate
calcium aluminate cement hydration as well as to a method for a chemical fastening of anchors and post-installed reinforcing bars, preferably of
metal anchors and post-installed reinforcing bars, in mineral substrates, such as structures made of
brickwork, concrete,
pervious concrete or
natural stone.