specifications - FAACO - Federal Aviation Administration Contract ...

FTWIC-2235June, 20094. When temporary coverings are used, keep them in place only until the slab hassufficiently hardened so that a cotton mat covering can be substituted withoutmarring or disturbing the slab finish. Thoroughly saturate cotton mats beforeplacing and keep the mats on the slab in a saturated condition for a period of atleast four (4) curing days.5. Curing by flooding or submerging concrete shall not be permitted.D. SHEET CURING:Sheet materials shall conform to ASTM C-171. They shall be in contact with the entireconcrete surface and applied according to the manufacturer's recommendations. Patchall holes. Where pedestrian traffic is unavoidable, provide suitable walkways to protectthe sheet material.E. MEMBRANE CURING:3.20 FILLING TIE HOLES:1. Membrane curing shall not be used on surfaces which receive paint, floorhardener, or plaster mix finish or other finish which would be hindered by the useof the curing compound.2. Cover the surface of the concrete with a continuous, uniform, water-impermeablecoating, conforming to ASTM C-309 "Liquid Membrane Forming Compoundsfor Curing Concrete" and apply according to ACI-308.3. Immediately after the removal of the side and end forms, apply a coating to thesides and ends of all concrete. Apply the solution under pressure with a spraynozzle so that the entire exposed surface is completely covered with a uniformfilm. The rate of application shall insure complete coverage, but the area coveredshall not exceed 150 square feet per gallon of curing compound.4. The coating shall be sufficiently transparent and free of permanent color to notresult in a pronounced color change from that of the natural concrete at theconclusion of the curing period. The coating shall, however, contain a dye ofcolor strength to render the film distinctively visible on the concrete for a periodof at least four (4) hours after application.5. After application and under normal conditions, the curing compound shall be dryto touch within one (1) hour and shall dry thoroughly and completely within four(4) hours. When thoroughly dry, it shall provide a continuous flexible membranefree from cracks or pinholes and shall not disintegrate, check, peel, or crackduring the required curing period.6. If the seal is broken during the curing period, immediately repair it withadditional sealing solution.After the tie rods are broken back or removed, thoroughly clean the holes to remove grease andloose particles. Patch holes with structural concrete repair material. After the holes are03300-28