2016-042 Resolution - Laserfiche WebLink

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or Engineer -approved equal shall be sprayed on the screeded surface in conformity with manufacturer's directions if the air temperature is expected to reach 80°F or above before cure is complete. B. Floating shall start as soon as the screeded surface has stiffened sufficiently. Floating shall be performed as necessary to produce a smooth, even, textured finish. Floating shall be performed by hand using magnesium tools. C. The slab surface shall be tested for accuracy with a straight edge after the first floating finish is completed. Any depressions shall be filled and high areas shall be cut down and reworked. Straight edge testing and refloating shall continue until there are no deviations of more than 1/8 inch under a ten foot straight edge. D. Slabs and other surfaces, unless noted otherwise, shall be broomed after final floating to provide a nonskid surface. A soft bristled push broom shall be used, with a swirling motion. 3.12 CURING AND SEALING: A. All finished concrete shall be cured by a curing method compatible with the final floor finish for a minimum of 7 days in accordance with ACI 301 Chapter 12. One or more of the following methods may be used, if approved by the Engineer, except where a specified curing method is called for: 1. Water curing by ponding or continuous wetting of sand or burlap. 2. Form curing by leaving on the forms and wetting for seven days. 3. An approved sprayed -on curing compound applied in accordance with the manufacturer's instruction. 3.13 COLD WEATHER CONCRETING A. Thorough preparation for protection against cold weather damage to concrete shall be made well in advance. Cold weather concreting shall be performed in accordance with ACI 306. B. Concrete shall be protected from freezing for not less than the first 48 hours after placing after the first frost, or when the mean 24- hour temperature at the job site falls below 407. C. The placing temperature of the concrete shall be maintained above 50°F when the mean 24-hour temperature falls below 40°F. D. The temperature of fresh -placed concrete shall be between 50 and 607.