In accordance with DIN 18157 the installation of tiles to dense concrete is only recommended after 6 months at the earliest. Causes for damage are high shrinkage stresses, which green concrete substrates exhibit. In these named areas, the use of single part flexible adhesives is not represented.
In our experience, when installing to green concrete, only products such as UNIFIX-S3/-S3-fast are to be recommended. These are highly elastic tile adhesives – tested to DIN 12004 and with a deformability of S2 to DIN 12002.
Only a product, which exhibits this type of highly deformable technological profile – reliably disspating high shear forces – can be used.
Before installing the tiles, it is mandatory to prepare the substrate using shot blasting, high presssure washing or similar techniques in order to remove laitance layers present.
NOTE: Exclude moisture rising from the substrate. This type of installation does not conform to recognised technical regulations and is to be contractually declared separately.