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<br />002438 <br /> <br />Durango Pumping Plant - Stage 1 <br /> <br />Apply curing compound using personnel qualified in the specified spray <br />techniques. <br /> <br />Apply the compound in a marmer conforming with safe control <br />proceedings outlined in the manufacturer's instructions and the MSDS. <br /> <br />In order to ensure bond of curing compound, remove excessive form oil <br />from concrete surfaces by washing with a solution of trisodium phosphate, <br />followed by a thorough rinsing of the surfaces with clear water. The <br />trisodium phosphate wash will be required when the amount of form oil on <br />the concrete will impair the bond of the curing compound or when <br />surfaces are exposed to public view. <br /> <br />Keep the formed concrete surfaces where curing compound is to be <br />applied continuously moist by repeated light spraying with water until <br />immediately prior to application of curing compound. Apply the curing <br />compound as soon as the surface film of moisture has disappeared, but <br />while the concrete still has a damp appearance. <br /> <br />After application of the curing compound has been completed and the <br />coating is dry to touch, perform all remaining required concrete repairs <br />without delay. Moisten and coat completed repairs with curing compound <br />in accordance with the foregoing requirements. <br /> <br />Repair without delay curing compound that is damaged, or that peels from <br />concrete surfaces within 28 days after application, by moistening the <br />concrete and applying additional compotmd in a manner satisfactory to the <br />Contracting Officer. <br /> <br />o. Reapply the curing compound as necessary to maintain a continuous, <br />water-retaining film on the surface for 28 days. <br /> <br />m. <br /> <br />n. <br /> <br />1. <br /> <br />J. <br /> <br />k. <br /> <br />I. <br /> <br />( <br /> <br />12. Curing with polyethylene film <br /> <br />a. Completely cover surfaces with polyethylene film to provide an airtight, <br />water-retaining film over the entire concrete surface for at least 14 days. <br /> <br />b. As soon as the concrete has hardened sufficiently to prevent damage, <br />thoroughly moisten all surfaces by spraying them lightly with water and <br />then covering them completely with polyethylene film. <br /> <br />c. Lap edges ofthe polyethylene strips to effect a seal to adjacent strips and, <br />at the extreme edge of the curing area, held tightly against the concrete <br />surface. <br /> <br />d. Adequately secure the polyethylene film to withstand wind and to prevent <br />circulation of air inside the curing fihn. <br /> <br />e. Sustain polyethylene film curing for at least 14 days and protect <br />polyethylene film as necessary to keep it intact, and keep the concrete <br />surface moist for the full curing period. <br /> <br />H. Protection during curing <br /> <br />Cast-in-Place Concrete <br />03300 . 34 <br />