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City of Santa Ana Public Library Renovation <br />Page & Turnbull Group 4 Architecture Research + Planning, Inc. <br />ASI 034 – December 24, 2025 Group 4 Project No. 22575-01 <br /> <br />03 0130-4 REHABILITATION OF CAST-IN-PLACE-CONCRETE <br /> <br />3.2 DEMOLITION AND SURFACE PREPARATION <br />A. Close off, seal, mask, or board up areas, materials, and surfaces as required to protect from <br />damage. Protect surfaces from damage and immediately remove stains, efflorescence, and <br />excess materials resulting from concrete repair. <br />B. Completely remove cracked existing concrete patches where shown on drawings. <br />C. Locate and identify form ties, straps, reinforcing bars, and other metal embedded into <br />concrete that have breached the surface. Cut form ties and straps to 1 in. behind finished <br />concrete surface and prime exposed edge with anti-corrosion coating. <br />D. Conduct concrete removal in a manner to prevent cutting, nicking, bending, or otherwise <br />damaging the reinforcing bars. Repair or replace accidentally damaged reinforcement at no <br />cost to the Owner. <br />E. Remove all loose particles and deleterious materials from the exposed sound concrete, and <br />clean reinforcing bars by wire brushing. Clean metal to SSPC-6, commercial blast finish, or <br />better. <br />F. Concrete Surfaces <br />1. After delaminated concrete removal, concrete surfaces shall have a slightly open, <br />scarified substrate. All surfaces must be clean, dry, sound, and frost-free with all <br />residues and other contaminants removed. <br />G. Spalls <br />1. Provide 3/4 in. deep saw cut edges around the perimeter of the repair area, normal to <br />the face of the surrounding concrete. Make saw cuts after sufficient concrete is <br />removed to locate and determine actual concrete cover over reinforcement. Do not <br />cut into reinforcement. Reduce depth of saw cut over reinforcement as required. <br />2. Remove all loose and unsound concrete in the area to be repaired. Remove <br />concrete to such additional breadth and depth as required to expose undamaged <br />reinforcing bars and a surface of sound uncontaminated concrete. Where reinforcing <br />bars are exposed for more than one-half the bar perimeter, remove concrete to a <br />minimum depth of 3/4 in. beyond the reinforcing bar. Conduct concrete removal in a <br />manner to prevent cutting, nicking, bending, or otherwise damaging the <br />reinforcement. Repair or replace accidentally damaged reinforcement at no cost to <br />the Owner. <br />3. Exposed steel reinforcement within the substrate should be high-pressure washed <br />and mechanically cleaned to shiny metal. Prime with Anti-Corrosion Coating in <br />accordance with manufacturer’s written instructions before applying patching mortar. <br />Refer to manufacturer’s literature for maximum open times. <br />H. Cracks <br />1. Route out all cracks to a minimum 1/4 in. wide and 1/4 in. deep. <br />I. Pressure wash wall surface. Take all appropriate measures to contain water so as to avoid <br />water overspray onto adjacent properties and street. <br />1. Do not allow water to run into cavity between building wall and walls of adjacent <br />properties. <br />J. Beginning of installation means installer accepts existing conditions.