Cement-based, flexible, powdered, frost-resistant, additive-enhanced, hydraulic-bonding, adhesive mortar. Suitable for ceramic tiles, paving slabs, mosaics, natural and artificial stones, fine stone slabs, and granite slabs, on standard building substrates, both indoors and outdoors. Particularly suitable for surfaces subject to high mechanical and thermodynamic stresses (indoor and outdoor floors, etc.), heated surfaces, terraces, balconies, swimming pools and thermal pools).