Gateway Park Technical Specs Volume 1 (3)

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Gateway Park Center PERKINS+WILL 810495.00 12/06/18 033000-35 Cast-In-Place Concrete 10.The topping mix shall contain a minimum of 5 lbs. per cubic yard (2.43 kg/m3) of macro synthetic fibers and achieve an Average Residual Strength (ARS) of 200 psi (1.4MPa) unless a higher dosage or ARS is noted on the plans. 11.The topping slab shall be moist cured for a minimum of 36 hours after placement. 12.The topping slab shall have contraction joints located to match any joints in the base slab, to eliminate restraint conditions such as re-entrant corners and to isolate the slab from columns, walls, etc. and to limit the maximum distance between joints to 15 feet (4570mm). I.Hot-Weather Placement: 1.Hot weather is defined as air temperature which exceeds 90°F (32°C) or any combination of high temperature, low humidity and/or high wind velocity which causes a rate of evaporation in excess of 0.2 pounds per square feet per hour (1.0 kg/m² per hour) as determined by ACI 305R. 2.When hot weather conditions exist that would impair quality and strength of concrete, place concrete in compliance with ACI 305R and as specified in this section. 3.Cool ingredients before mixing to maintain concrete temperature at time of placement below 90°F. 4.Mixing water may be chilled, or chopped ice may be used to control temperature, provided water equivalent of ice is calculated to total amount of mixing water. 5.Use of liquid nitrogen to cool concrete is Contractor's option. 6.When concrete placement will occur late in the day and reinforcing steel will be heated by the sun, cover reinforcing steel with water-soaked burlap so that steel temperature will not exceed ambient air temperature immediately before embedding in concrete. 7.When concrete operations must be performed in direct sun, wind, high temperatures, low relative humidity, or other adverse placing conditions, the specified evaporation retarder shall be applied one or more times during the finishing operation to prevent plastic cracking. 3.5 CONCRETE FINISHES A.General: 1.Comply with recommendations for concrete finishing established by ACI 302.1R and ACI 304R. 2.Comply with dimensional tolerance limitations given by ACI 117. 3.For shored floor or slab on grade construction: Floor flatness/floor levelness tolerance compliance testing is to be performed prior to the removal of shores and forms but not later than 72 hours of concrete placement by Owner’s Testing Agency. 4.See architectural Drawings for locations of the various finishes listed below. 5.Comply with the specified overall SOFF and SOFL values listed below: