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<br />r. 3. Polyethylene Film <br />~ e. :Where polyethylene f~1m is used, lapped edges at the seams <br />shall be covered with tape. Prior precautions shall be taken to <br />protect the polyethylene from construction traffic, etc., so <br />that no damage is done to the polyethylene. <br />b. Polyethylene film may be used only for curing flat slabs. <br />c. Concrete under the polyethylene film shall be kept moist. <br />_ Polyethylene film shall be secured to the area being cured in a <br />proper manner to prevent loss of the film or damage to it. <br />4. Curing Compound <br />e. When liquid membrane seal is used for curing, the application <br />rate shall be one gallon per 150 sq.ft. to one gallon per 200 sq. <br />ft. depending upon the roughness of the concrete surface. <br />b. Application should be such that an even, white continuous <br />_. membrance is produced on the concrete surface. <br />- c. The Contractor will be required to thoroughly remove liquid <br />_ • membrane compound from concrete surfaces to which a <br />bonding compound, joint sealer or waterproofing material is to <br />be applied. <br />-- J. Protection <br />1. Weather <br />e. The Contractor is expected to schedule the placement of <br />structural concrete so that the date and hour decided upon <br />reflect consideration of weather conditions. <br />_ b. Concrete shall be protected from rainwater until the surface <br />has attained sufficient set to withstand the mechanical force <br />- of the raindrops, the erosion of the surface during runoff and <br />the over-dispersion of cement particles. <br />c. Concrete shall not be placed against surfaces whose <br />temperature is below 40°F. Concrete shall be protected from <br />- freezing using approved coverings and, when necessary, the <br />surrounding air heated in such manner that drying of the <br />concrete w~11 not occur. <br />d. Reasonable protection shall be provided to prevent rapid <br />- drying of concrete as a result of conditions of low humidity, <br />_ . high wind, high atmospheric temperatures, or combinations of <br />the aforementioned. <br />03300-13 <br />