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Section 50 – Construction Materials

hour, the Agency may shut down the work for the remainder of the day. If the work is shut

down, the Contractor, at the Contractor’s expense, shall make a construction joint in the

concrete already placed at the location and of the type directed by the Agency.

Transit-mixed concrete shall be delivered to the site of the Work and discharge shall be

completed within ninety (90) minutes after the addition of the cement to the aggregates or

before the drum has been revolved two hundred fifty (250) revolutions, whichever comes first.

In hot weather or under conditions contributing to quick stiffening of the concrete or when the

temperature of the concrete is eighty-five degrees (85°) F or above, the time between the

introduction of the cement to the aggregates and discharge shall not exceed forty-five (45)

Batch or transit-mixed concrete delivered to the Work shall be accompanied by a ticket

showing the volume of the concrete, the weight of cement in pounds, and the total weight of all

ingredients in pounds. The ticket shall also show the time of day the materials were batched.

The Agency may stop concrete pouring if the placing of the concrete is causing separation

of constituent materials of the concrete.

Transporting of concrete in non-mixing trucks or trailers will not be permitted.

50-5.04 Water Control

Within the limits hereinafter specified, the amount of water required for the proper

consistency of concrete shall be determined by the slump test, in accordance with ASTM

The Allowance for slump, unless otherwise directed by the Agency, shall be as follows:

Concrete paving and unreinforced structures—Not more than three inches (3”)

Reinforced structures and columns—Not more than four inches (4”)

Concrete placed under water—Not less than six inches (6”) nor more than eight

No additional mixing water shall be incorporated into the concrete during hauling or after

arrival at the delivery point, unless authorized by the Agency. If the Agency authorizes

additional water to be incorporated into the concrete, the drum shall be revolved not less than

thirty (30) revolutions at mixing speed after the water is added and before discharge is

If the concrete is mixed in transit, the control equipment shall be at the proportioning plant

and there shall be no water added after the mixture leaves the plant, unless directed by the

The Contractor shall furnish, without charge, such materials as may be required for making

tests of concrete during the progress of the Work. Such tests will be made at the Agency’s

50-6 CURING COMPOUNDS FOR CONCRETE

Concrete curing compounds shall be used where specified in these Specifications and the

The compounds shall meet the requirements of Section 90-7.01B, “Curing Compound

Method”, of the State Specifications.

50-7 AGGREGATE BASES

Aggregate bases shall conform to the requirements of Section 26, “Aggregate Bases”, of the

State Specifications, and these Specifications.

The combined aggregate shall conform to the gradation requirements specified for the 3/4-

inch maximum aggregate for Class 2 aggregate base, unless otherwise specified in the Special