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1 <br /> for three (3) days or 50°F for five (5) days after placing. Provide temporary housing or <br /> coverings including tarpaulins or plastic film. Keep protections in place and intact at least <br /> 1 24 hours after artificial heat is discontinued. Keep concrete moist. Avoid rapid dry-out of <br /> concrete due to over-heating and avoid thermal shock due to sudden cooling or heating. <br /> 1 3. When air temperature has fallen to or is expected to fall below 40°F, uniformly heat all <br /> water and aggregates before mixing as required to obtain a concrete mixture temperature <br /> of not less than 50°F, and not more than 80°F, at point of placement. <br /> 4. Do not use frozen materials containing ice or snow. Do not place concrete on frozen <br /> subgrade or on subgrade containing frozen materials.Ascertain that forms,reinforcing steel <br /> and adjacent concrete surfaces are entirely free of frost, snow and ice before placing <br /> concrete. <br /> 1 5. Do not use calcium chloride, salt and other materials containing antifreeze agents or <br /> chemical accelerators unless otherwise accepted in mix designs. <br /> E. Hot Weather Placing <br /> 1. When hot weather conditions exist that would seriously impair the quality and strength of <br /> concrete,place concrete in compliance with ACI 305 and as herein specified. <br /> 2. Cool ingredients before mixing to maintain concrete temperature at time of placement <br /> below 90°F. Mixing water may be chilled, or chopped ice may be used to control the <br /> concrete temperature provided the water equivalent of the ice is calculated to the total <br /> amount of mixing water. <br /> 3. Cover reinforcing steel with water soaked burlap if it becomes too hot so that the steel <br /> temperature will not exceed the ambient air temperature immediately before embedment in <br /> concrete. <br /> 4. Wet forms thoroughly before placing concrete. <br /> t5. Do not use retarding admixtures unless otherwise accepted in mix designs. <br /> 3.4 FINISH OF FORMED SURFACES <br /> A. Rough Form Finish <br /> For formed concrete surfaces not exposed to view in the finish work or covered by other <br /> construction, unless otherwise shown or specified. This is the concrete surface having the <br /> texture imparted by the form facing material used, with tie holes and defective areas repaired <br /> and patched and fins and other projections exceeding 1/4inch in height rubbed down or chipped <br /> off. <br /> B. Smooth Form Finish <br /> I <br /> Legion Golf Course Stormwater Detention Project Concrete Work <br /> WO#UP3620 03 11 00-7 <br />