Mortar compositions

An aqueous mortar composition having a viscosity in the range of 10,000 to 1,200,000 cps comprising

• a film-forming, room temperature cross-linkable polymer in the form of an emulsion, suspension, dispersion or partial solution, having substituents on the polymer chain selected from the group consisting of epoxy, hydroxy, methylol, carboxy, ester, .alpha.-olefin, isocyanate, methylol acrylamide, amino, N-methylol amide, internal double bond and combinations thereof, wherein said substituents are capable of reacting at room temperature to cross-link said polymer,
• a water-insoluble filler selected from the group consisting of glass, quartz, silica, limestone, barytes, wollastonite, mica, flint powder, kryolite, alumina trihydrate, talc, pyrophyllite, zinc oxide and mixtures thereof, and
• a cross-linking aid which is an acidic catalyst selected from the group consisting of inorganic and organic salts, organic acids, and amine acid-addition salts,
• said polymer comprising from 2% to 16% by weight, and said filler from 50% to 90% by weight of the total aqueous composition and wherein said composition is a non-hydraulic mortar.