Orange County NC Website
Browse       Search
<br />High Rock Road Waste and Recycling Center Improvements 32 13 13 - 5 <br />Orange County, North Carolina JULY 2021 <br />DAA PN: R00592-213N <br /> <br />the surface. Do not further disturb concrete surfaces before beginning finishing <br />operations or spreading surface treatments. <br />3.6 FLOAT FINISHING <br />A. General: Do not add water to concrete surfaces during finishing operations. <br />B. Float Finish: Begin the second floating operation when bleed-water sheen has <br />disappeared and concrete surface has stiffened sufficiently to permit <br />operations. Float surface with power-driven floats, or by hand floating if area is <br />small or inaccessible to power units. Finish surfaces to true planes. Cut down <br />high spots and fill low spots. Refloat surface immediately to uniform granular <br />texture. <br />1. Medium-to-Coarse-Textured Broom Finish: Provide a coarse finish by <br />striating float-finished concrete surface 1/16 to 1/8 inch deep with a stiff- <br />bristled broom, perpendicular to line of traffic. <br />C. Slip-Resistive Aggregate Finish: Before final floating, spread slip -resistive <br />aggregate finish on pavement surface according to manufacturer's written <br />instructions. <br />1. Cure concrete with curing compound recommended by slip-resistive <br />aggregate manufacturer. Apply curing compound immediately after final <br />finishing. <br />2. After curing, lightly work surface with a steel wire brush or abrasive stone <br />and water to expose nonslip aggregate. <br />3.7 CONCRETE PROTECTION AND CURING <br />A. General: Protect freshly placed concrete from premature drying and excessive <br />cold or hot temperatures. <br />B. Comply with ACI 306.1 for cold-weather protection. <br />C. Evaporation Retarder: Apply evaporation retarder to concrete surfaces if hot, <br />dry, or windy conditions cause moisture loss approaching 0.2 lb/sq. ft. x h <br />before and during finishing operations. Apply according to manufacturer's <br />written instructions after placing, screeding, and bull floating or darbying <br />concrete, but before float finishing. <br />D. Begin curing after finishing concrete but not before free water has disappeared <br />from concrete surface. <br />E. Curing Methods: Cure concrete by moisture curing. <br />DocuSign Envelope ID: BBF56E0A-3618-497E-AA70-92F097E8F598