Attachment_10_Amendment_No_0004_0004.pdf
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- Attached to
- FKC Middle Reach Capacity Correction Project Phase Federal contract opportunity
- Solicitation number
- 140R2020R0009
About this file
This document is an amendment to a solicitation for the FKC Middle Reach Capacity Correction Project Phase 1. The solicitation is issued by the Department of the Interior Bureau of Reclamation for cast-in-place concrete work on the project. The amendment modifies curing requirements and provides specifications for measuring cement, aggregate, and water quantities in concrete batches. Ready-mixed concrete may be used if it meets material, batching, mixing, transporting, and placement standards in accordance with cited ASTM standards and specifications. Non-agitating equipment cannot be used for transporting ready-mixed concrete.
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Text version
Solicitation No: 140R2020R0009 Specifications No. 20-C0907
STANTEC/184031016 CAST-IN-PLACE CONCRETE
FKC MIDDLE REACH CAPACITY CORRECTION PROJECT PHASE 1 PAGE 03 31 00 - 27
5. modifying the curing requirements; or
6. other actions to minimize shrinkage or the effects of shrinkage.
2.9 MEASUREMENT OF CEMENT AND AGGREGATE
A. The amount of cement and of each separate size of aggregate entering into each batch of concrete shall be determined by direct weighing equipment furnished by the CONTRACTOR and acceptable to the CONTRACTING OFFICERS
REPRESENTATIVE.
B. Weighing Tolerances
Material Percent of Total Weight
Cement 1
Aggregates 3
Admixtures 3
2.10 MEASUREMENT OF WATER
A. The quantity of water entering the mixer shall be measured by a suitable water meter or other measuring device of a type acceptable to the CONTRACTING OFFICERS REPRESENTATIVE and capable of measuring the water in variable amounts within a tolerance of one percent.
B. The water feed control mechanism shall be capable of being locked in position in order to constantly deliver the required amount of water to each batch of concrete.
C. A positive, quick-acting valve shall be used for a cut-off in the water line to the mixer, and the operating mechanism shall prevent leakage when the valve is closed.
PART 3 -- EXECUTION
3.1 READY-MIXED CONCRETE
A. General
1. At the CONTRACTOR's option, ready-mixed concrete may be used if it meets the indicated requirements as to materials, batching, mixing, transporting and placement, and is in accordance with ASTM C 94 and the following supplementary requirements.
2. Ready-mixed concrete shall be delivered to the WORK, and discharge shall be completed within one hour after the addition of the cement to the aggregates or before the drum has been revolved 250 revolutions, whichever occurs first.
3. The use of non-agitating equipment for transporting ready-mixed concrete will not be permitted.
Attachment 10 Amendment No 0004 swolfert Text Box This does not apply to canal lining concrete transported from a batch plant central mixer.
swolfert Polygon
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