Waterproofing membrane with mineral binder component

A method for waterproofing a substrate, the method comprising:

• providing a membrane comprising:
• a barrier layer having a first and a second opposing surface, and
• a contact layer having a first and a second opposing surface,
• applying the membrane to a surface of the substrate such that the second surface of the barrier layer is directed against the surface of the substrate,
• casting a fresh cementitious composition on the first surface of the contact layer, and hardening the fresh cementitious composition,
• wherein at least a portion of the first surface of the barrier layer and the second surface of the contact layer are directly bonded to each other,
• the barrier layer comprises a thermoplastic polymer component,
• the contact layer comprises a mixture including a mineral binder component, a thermoplastic polymer component, and a surfactant component, the thermoplastic polymer component being the only thermoplastic polymer component in the contact layer,
• wherein the surfactant comprises at least one surfactant selected from the group consisting of glycerol monostearates, polycarboxylate ethers, polyether-modified polysiloxanes, polyalkylene oxide siloxanes, hydroxyethyl amines, erucamides, stearyl stearamides, alkali metal alkanesulfonates, alkyl aryl sulfonates, and mixtures thereof,
• the thermoplastic polymer component of the contact layer consists of at least one ethylene-vinyl acetate co-polymer (EVA) or at least one ethylene-propylene co-polymer,
• an amount of the mineral binder component is in a range of 10.0-90.0 wt.-%, based on a total weight of the contact layer,
• the membrane has a concrete adhesion strength that is at least 15 N/50 mm, as determined by a method comprising peeling the membrane from a surface of a concrete specimen at a peeling angle of 90° using a material testing apparatus equipped with a peeling device or a testing apparatus fulfilling requirements of DIN EN 1372 standard, where the concrete specimen was casted on the first surface of the contact layer and hardened for 28 days under standard atmosphere,
• a thickness of the barrier layer is in a range of 0.1 to 10.0 mm,
• a thickness of the contact layer is in a range of 0.1 to 50.0 mm,
• the contact layer comprises not more than 1.5 wt.-% of hydrated mineral binders, based on the total weight of the contact layer,
• the membrane has a tensile strength at temperature of 23° C. measured according to standard DIN ISO 527-3 of at least 5 MPa, and
• the membrane has an elongation at break at a temperature of 23° C. measured according to standard DIN ISO 527-3 of at least 100%.