Use of an injectable synthetic mortar for fixing anchoring elements in holes, wherein the injectable synthetic mortar comprises at least one component a) alone based on at least one silane-terminated synthetic resin that includes at least one Si-bonded hydrolysable group and is introduced into a hole or, in the case of a multicomponent injectable synthetic mortar, additionally comprises at least one component b) having a water-based hardener, wherein in the case of a multicomponent injectable synthetic mortar the components are mixed together at the site of use and introduced simultaneously and/or subsequently into a hole; and simultaneously or subsequently an anchoring element is introduced into the hole, the injectable synthetic mortar having been deaerated so as to be free of finely distributed gases in such a way that the volume of gases dissolved therein is less than 0.5 % by volume at room temperature and normal pressure; and the silane-terminated synthetic resins that include at least one Si-bonded hydrolysable group which are present in the at least one component a) are those obtainable (i) by reaction of organic polyamines with silanes that include one or more epoxy and/or isocyanate and/or (meth)acrylic and/or anhydrido groups and include at least one Si-bonded hydrolysable group; (ii) by reaction of mono-functional or higher functional hydroxy-group-containing resins or polyols with silanes that include one or more epoxy and/or isocyanate and/or anhydrido groups and include at least one Si-bonded hydrolysable group; (iii) by reaction of vinyl-group-containing resins with silanes that include one or more amino and/or thiol groups and include at least one Si-bonded hydrolysable group; (iv) by reaction of anhydride-group-containing compounds with silanes that include one or more amino groups or isocyanato groups and at least one Si-bonded hydrolysable group; (v) by reaction of resins that carry isocyanate radicals, at least some of which radicals, as a result of reaction with one another, are present in the form of biuret, allophanate, uretdione, isocyanurate, iminooxadiazinedione and/or uretonimine groups, with silanes having as substituents at least one Si-bonded hydrolysable group and at least one group that is reactive towards isocyanate groups selected from amino, sec.-amino, mercapto, epoxy, isocyanato and/or anhydrido group(s), especially an amino group; (vi) or by use of the products of two or more of the afore-mentioned reactions. (i) by reaction of organic polyamines with silanes that include one or more epoxy and/or isocyanate and/or (meth)acrylic and/or anhydrido groups and include at least one Si-bonded hydrolysable group; (ii) by reaction of mono-functional or higher functional hydroxy-group-containing resins or polyols with silanes that include one or more epoxy and/or isocyanate and/or anhydrido groups and include at least one Si-bonded hydrolysable group; (iii) by reaction of vinyl-group-containing resins with silanes that include one or more amino and/or thiol groups and include at least one Si-bonded hydrolysable group; (iv) by reaction of anhydride-group-containing compounds with silanes that include one or more amino groups or isocyanato groups and at least one Si-bonded hydrolysable group; (v) by reaction of resins that carry isocyanate radicals, at least some of which radicals, as a result of reaction with one another, are present in the form of biuret, allophanate, uretdione, isocyanurate, iminooxadiazinedione and/or uretonimine groups, with silanes having as substituents at least one Si-bonded hydrolysable group and at least one group that is reactive towards isocyanate groups selected from amino, sec.-amino, mercapto, epoxy, isocyanato and/or anhydrido group(s), especially an amino group; (vi) or by use of the products of two or more of the afore-mentioned reactions.