Rev. 7-17-97

HIGH RANGE WATER REDUCERS 
IN PRECAST PRESTRESSED CONCRETE STRUCTURAL MEMBERS
707-B-013

The Standard Specfications are revised as follows:

 SECTION 707, BEGIN LINE 121, DELETE AND INSERT AS FOLLOWS:
        (c) Concrete. Concrete shall be air entrained and in accordance with the applicable provisions requirements of 702.05. Water-reducing admixtures, or water-reducing and retarding
admixtures, or high range water reducing and retarding admixture systems may be used. Admixture and admixture systems shall be in accordance with 912.03. The use of either a type A or a type D chemical admixture shall be in accordance with 702.05 as specified for class C concrete. If a high range water reducing admixture system is to be used in portland cement concrete, the procedures for batching shall be consistent. The concrete shall be mixed until a uniform consistency is achieved.
Admixtures shall not contain chlorides which have been added

SECTION 707, LINE 128, INSERT AS FOLLOWS:
will not apply. Slump shall be no less than 50 mm (2 in.) nor more than 125 mm (5 in.). Concrete with high range water reducing or a high range water reducing retarding admixture system shall be in accordance with the requirements as follows:

  1. The slump shall be a minimum of 75 mm (3 in.) and a maximum of 150 mm (6 in.).

  2. The amount of time from mixing to final placement and consolidation shall be a maximum of 30 minutes.

  3. The concrete mixture shall not be retempered with additional amounts of high range water reducing or high range water reducing and retarding admixture after the initial mixing has been completed.