Patent ID: 6898917

Claim:
Method for making a concrete floor structure, comprising: applying onto a substrate having a horizontal upward-facing surface a continuous waterproofing membrane having a polymeric film carrier sheet having two major sides and a self-adhering, pressure-sensitive waterproofing adhesive layer disposed on at least one of said two major sides, said pressure-sensitive waterproofing adhesive comprising a synthetic adhesive having an average thickness of 2-60 mils, said waterproofing adhesive layer side being disposed in an upwards direction when said membrane is applied onto said substrate, and said waterproofing membrane further comprising a finely divided particulate layer to protect said pressure-sensitive waterproofing adhesive from foot traffic; casting a hydratable mortar or concrete composition, which comprises a hydratable cementitious binder and water in a water/cementitious binder ratio of no less than 0.20 and no greater than 0.45 by weight, onto said waterproofing adhesive layer side of said waterproofing membrane and allowing said composition to bond to and form a horizontal slab upon said membrane, said composition further comprising a polycarboxylate superplasticizer in an amount no less than 0.03 and in an amount no greater than 5.0% based on dry weight of said hydratable cementitious binder in said composition, and said composition further comprising at least one shrinkage reducing admixture in an amount no less than 0.05% and in an amount no greater than 5.0% based on dry weight of said hydratable cementitious binder, said at least one shinkage reducing admixture comprising an oxyalkylene compound; applying a water-based adhesive layer onto said composition within 3-90 days after casting said composition onto said membrane; and applying a floor covering onto said water-based adhesive layer within 3-90 days after casting said composition onto said membrane.