Page 412605 FLY ASH
605.1 Description
This specification allows the substitution of fly ash for a portion of Portland cement in concrete.
605.2 Materials
Fly ash will conform to Section 753.
605.3 Construction Requirements
A.Limitations: Fly ash will not be permitted when Type III cement is used. B.Storage: Fly ash will be stored at the concrete plant site in clearly marked separate containers. Use of divided bins in the same silo will be permitted if the silo is commercially manufactured with divided bins or if the contractor/concrete supplier has a certification by a registered professional engineer that the divided bins will structurally handle the load associated with the use of the silo. C.Design Mix: Fly ash may be substituted for cement in concrete. The addition or deletion of fly ash from the mix will be at no cost to the Department. If fly ash is used, the minimum amount of cement to be replaced is 15% and the maximum amount is 25% at a 1:1 ratio by weight. Changes in fly ash source or mill plant coal supply will require a new mix design approval. D.Batching: Fly ash may be weighed on a separate scale or on the same scale as the cement. If the cement scale is used, the cement must be weighed first.
605.4 Method of Measurement
No measurement will be made for fly ash.
605.5 Basis of Payment
Payment for the use of fly ash will not be made. All costs for sampling, testing, and using fly ash will be incidental to the respective concrete bid item. Page 413610 CATTLE GUARDS
610.1 Description
This work consists of furnishing and constructing cattle guards.
610.2 Materials
The materials will conform to the kind, type, grade, and size specified in the plans and the proposal.
610.3 Construction Requirements
The cattle guards inclusive of foundations, approaches, and grating will be accurately placed and constructed after completion of the grading work.
610.4 Method of Measurement
Cattle guards will be measured per each cattle guard furnished and installed.
610.5 Basis of Payment
Cattle guards will be paid for at the contract unit price per each. Payment will be full compensation for materials, equipment, labor, excavating, backfilling, and incidentals necessary.
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