Patent ID: 7219479

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 waterproofing adhesive comprising a synthetic adhesive having an average thickness of 2–60 mils; said adhesive being selected from butyl rubber based adhesives, polyisobutylene based adhesives, polyisobutyl based adhesives, acrylic based adhesives, vinyl ether based adhesives, styrene-isoprene-styrene based adhesives, styrene-ethylene-butylene-styrene based adhesives, and styrene-butadiene-styrene based adhesives; and said waterproofing adhesive layer side being disposed in an upwards direction when said membrane is applied onto said substrate; said waterproofing membrane further comprising a protective layer comprising an elastomeric coating layer, or a finely divided particulate layer, or both of said layers whereby said protective layer is operative to resist foot traffic while permitting concrete to be cast onto said adhesive and protective layers so as to bond mechanically with said adhesive layer; and 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 and protective coating 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 comb polymer polycarboxylate superplasticizer in an amount no less than 0.03 and in an amount no greater than 5.0% based on dry weight of hydratable cementitious binder in said composition, said comb polymer polycarboxylate superplasticizer having a carbon-containing backbone with pendent cement-anchoring members and pendent oxyalkylene groups; and said mortar or concrete 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 shrinkage reducing admixture being selected from the group consisting of an oxyalkylene glycol, an oxyalkylene ether adduct of an alcohol, glycol, or glycerol, and an ammonium salt of tall oil fatty acid; and said mortar or concrete composition further having a vapor transmission rate equal to or less than 3 pounds/1000 square feet/24 hours at 3–90 days after placement.