Vol 2 - Garney Construction

1.02 DEFINITIONSp. C1583/C1583M, Standard Test Method for Tensile Strength ofConcrete Surfaces and the Bond Strength or Tensile Strength ofConcrete Repair and Overlay Materials by Direct Tension (PulloffMethod).q. D4258, Standard Practice for Surface Cleaning Concrete forCoating.r. D4259, Standard Practice for Abrading Concrete.s. E699, Standard Practice for Evaluation of Agencies Involved inTesting, Quality Assurance, and Evaluating of BuildingComponents.A. Abrasive Blasting: Surface preparation method that uses compressed airintermixed with an abrasive medium to clean surface of substrate concrete,exposed steel, and reinforcing steel. Compressed air and abrasive medium isprojected at high speed through a nozzle directly at the surface. Method isused to remove corrosion by-products, laitance, or other materials that mayinhibit bond of repair concrete.B. Defective Area: Surface defect such as honeycomb, rock pockets, indentationsand surface voids greater than 3/16-inch deep, surface voids greater than3/4-inch diameter, cracks in liquid containment structures and belowgradehabitable spaces 0.005-inch wide and wider, cracks in other structures0.010-inch wide and wider, spalls, chips, embedded debris, sand streaks,mortar leakage from form joints, deviations in formed surface that exceedspecified tolerances which include but are not limited to fins, form pop-outs,and other projections, and at exposed concrete which includes textureirregularities, stains, and other color variations that cannot be removed bycleaning.C. High-Pressure Water Blasting: Sometimes referred to as hydro-demolition.Uses water that may contain an abrasive medium, projected under highpressure and high velocity. Used for demolition, cutting, partial or full depthremoval, cleaning, scarifying, or roughening of concrete surfaces, or removingexisting coatings, for preparation of substrate concrete surfaces.D. Low-Pressure Spray Mortar: Mortar suitable to be applied by low-pressurespraying, and in small areas may be applied by hand troweling.E. New Concrete: Concrete less than 60 days old forming structures constructedas part of the Work.REPAIR OF VERTICAL AND OVERHEADPW/WBG/382059CONCRETE SURFACES AUGUST 15, 201203 01 32 - 2 ©COPYRIGHT 2012 CH2M HILL