Vol 2 - Garney Construction

2.02 SYSTEM D—SITE-MIXED PORTLAND-CEMENT MORTAR2.03 WATERA. Mortar Materials:1. Use same materials as concrete to be repaired with no coarse aggregate,per Section 03 30 00, Cast-in-Place Concrete. Use of 3/8-inch nominalpea gravel acceptable where repairs are in excess of 1 inch deep.2. For repairs to exposed concrete, make trial batches to check colorcompatibility of repair mortar with existing surrounding concrete.3. When repair is too dark, substitute white portland cement for part of thegray portland cement to produce desired color closely matching color ofsurrounding concrete.A. Clean and free from oil, acid, alkali, organic matter, or other deleterioussubstances, meeting federal drinking water standards, as specified inSection 03 30 00, Cast-in-Place Concrete.2.04 REINFORCEMENTA. Mesh Reinforcement: Welded wire fabric flat sheets with spacing of wires andwire size in accordance with ASTM A185/A185M, wire 75 ksi minimumtensile strength per ASTM A82/A82M,and repair mortar systemmanufacturer’s recommendations.B. Mesh Anchors:1. Manufacturers and Products:a. Powers Fastening, Inc., Brewster, NY; Tie Wire Version ofPower-Stud.b. Hilti Fastener Systems, Tulsa, OK; Kwik Bolt II HHDCA,1/4-inch ceiling hanger.2.05 CEMENTITIOUS BONDING AGENT AND REINFORCEMENT COATINGA. Cementitious adhesive, specifically formulated for bonding plastic portlandcement concrete or mortar to hardened portland cement concrete.1. Mixed Bonding Agent Properties:a. Pot Life: 75 minutes to 105 minutes.b. Contact Time: 24 hours.2. Cured Cementitious Adhesive Properties:a. Splitting Tensile Strength, ASTM C496/C496M at 28 Days:500 psi minimum.b. Flexural Strength, ASTM C348: 1,000 psi minimum.REPAIR OF VERTICAL AND OVERHEADPW/WBG/382059CONCRETE SURFACES AUGUST 15, 201203 01 32 - 6 ©COPYRIGHT 2012 CH2M HILL