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PART 3 - EXECUTION <br /> <br />3.1 INSTALLATION, GENERAL <br /> <br /> A. Formwork: Design, construct, erect, shore, brace, and maintain formwork according to ACI <br /> 301. <br /> <br /> B. Vapor Retarder: Install, protect, and repair vapor-retarder sheets according to ASTM E 1643; <br /> place sheets in position with longest dimension parallel with direction of pour. <br /> 1. Lap joints 6 inches (150 mm) and seal with manufacturer's recommended tape. <br /> <br /> C. Steel Reinforcement: Comply with CRSI's "Manual of Standard Practice" for fabricating, <br /> placing, and supporting reinforcement. <br /> 1. Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder before <br /> placing concrete. <br /> <br /> D. Joints: Construct joints tree to line with faces perpendicular to surface plane of concrete. <br /> 1. Construction Joints: Locate and install so as not to impair strength or appearance of con- <br /> crete, at locations indicated by engineer of foundations and floor slabs. <br /> 2. Isolation Joints: Install joint-filler strips at junctions with slabs-on-grade and vertical sur- <br /> faces, such as column pedestals, foundation walls, grade beams and other locations, as <br /> indicated by engineer of foundations and floor slabs. <br /> a. Extend joint fillers full width and depth of joint, terminating flush with finished <br /> concrete surface, unless otherwise indicated. <br /> 3. Contraction Joints in Slabs-on-Grade: Form weakened-plane contraction joints, section- <br /> ing concrete into areas as indicated. Construct contraction joints for a depth equal to at <br /> least one-fourth of the concrete thickness, as follows: <br /> a. Grooved Joints: Form contraction joints after initial floating by grooving and fin- <br /> ishing each edge of joint with groover tool to a radius of 1/8 inch (3 mm). Repeat <br /> grooving of contraction joints after applying surface finishes. Eliminate groover <br /> marks on concrete surfaces. <br /> b. Sawed Joints: Form contraction joints with power saws equipped with shatter- <br /> proof abrasive or diamond-rimmed blades. Cut 1/8-inch (3-mm) wide joints into <br /> concrete when cutting action will not tear, abrade, or otherwise damage surface <br /> and before concrete develops random contraction cracks. <br /> <br /> E. Tolerances: Comply with ACI 117, "Specifications for Tolerances for Concrete Construction <br /> and Materials." <br /> <br />3.2 CONCRETE PLACEMENT <br /> <br /> A. Comply with recommendations of ACI 304R for measuring, mixing, transporting, and placing <br /> concrete. <br /> <br /> B. Consolidate concrete with mechanical vibrating equipment. <br />3.3 FINISHING FORMED SURFACES <br /> <br /> A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes <br /> and defective areas repaired and patched, and fins and other projections exceeding ~,4 inch (6 <br /> mm) in height rubbed down or chipped off. <br /> 1. Apply to concrete surfaces not exposed to public view. <br /> <br />City of Pads, Texas 03300 - 3 T-Hangar Building <br /> <br /> <br />