Use of protein concentrates of plant origin in cement-based adhesive mortars and thereby available cement-based adhesive mortar

Using protein concentrates of vegetable origin in amounts of ≤ 3 wt .-%, based on the still dry multi-component mixture of glue mortar, as an additional component in cement-based adhesive mortars to intensify and / or to compensate for the setting and interlayer adhesion disturbing influences between a fixed lower base and - by means of the adhesive mortar - mounted thereon ceramic and / or mineral coating materials.