specifications - FAACO - Federal Aviation Administration Contract ...

Concrete TemperatureFTWIC-2235June, 2009Maximum Time From Additionof Water to PlacementNon-Agitated ConcreteUp to 80 degrees FOver 80 degrees F30 Minutes15 MinutesAgitated ConcreteUp to 75 degrees F90 Minutes75 degrees to 89 degrees F 60 MinutesOver 90 degrees F(max. permissible concrete temp) 45 MinutesThe use of an approved set-retarding admixture will permit the extension of theabove time maximums by 30 minutes, for agitated concrete only.The use of an approved high range water reducing (HRWR) admixture will allowplacement time extensions as determined by the manufacturer.2. The maximum temperature of concrete shall not exceed 90 degrees F at the timethe concrete is placed. The temperatures of the mixing water shall be reduced bythe use of chilled water or ice.3. The maximum temperature of concrete with high range water reducing admixtureshall not exceed 100 degrees F at the time concrete is placed.4. Under extreme heat, wind, or humidity conditions, concreting operations may besuspended if the quality of the concrete being placed is not acceptable.PART 2.00PRODUCTS2.01 MATERIALS:A. CEMENT; GENERAL:If the fine and/or coarse aggregates test "Potentially Reactive", in accordance with ASTMC-289, a low alkali Portland Cement shall be used. The total alkali content calculated asthe percentage of sodium oxide (Na 2 O) plus 0.658 times the percentage of potassiumoxide (K 2 O) shall not exceed 0.6.03300-11