464 Page 339464 CONTROLLED DENSITY FILL
464.1DESCRIPTION
This work consists of furnishing, handling, and placing controlled density fill.
464.2MATERIALS
Materials will conform to the following sections. A.Cement: Section 750. Type I, Type II, Type III, or Type V cement may be used, unless otherwise specified. B.Fine Aggregate: Fine aggregate will be a natural sand conforming to the following gradation: Sieve Size Percent Passing 3/8 inch 100 #200 0 – 10.0 C.Water: Section 790. D.Admixtures: Controlled low strength material (CLSM) performance additive (foaming admixture) as listed on the Department’s approved products list. E.Fly Ash: Section 753.
464.3CONSTRUCTION REQUIREMENT
A.General: Controlled density fill will be a mortar material with a free-flowing consistency. B.Mix Design: The controlled density fill mix design will be in accordance with Section 462, except as modified below: Unless specified otherwise, the controlled density mix may conform to either of the two alternate mix designs. 1.Standard Mix Design: MaterialRate per Cubic Yard Cement 100 pounds Fine Aggregate 2,600 pounds Water 60 gallons Fly Ash 300 pounds 464 Page 3402.CLSM Mix Design: MaterialRate per Cubic Yard Cement 200 pounds Fine Aggregate 2,600 pounds Water 35 gallons CLSM Performance AdditiveAs recommended by the CLSM performance additive manufacturer to produce a target air content*1 of 20% ±5 *1evaluated for specification at mix design only Both alternate mix designs shown above are designed to produce a minimum compressive strength of 100 psi. C.Placement: The Contractor may adjust the proportion of water during placement to provide the necessary consistency of the mix, as approved by the Engineer. Controlled density fill will be contained within the required limits with sandbags or other methods approved by the Engineer. The Contractor will prevent floatation, uplift, and movement due to the buoyant force of the controlled density fill until the controlled density fill hardens. Overlying surfacing materials will not be placed sooner than 4 hours after placement of the controlled density fill.
464.4METHOD OF MEASUREMENT
Measurement for controlled density fill will not be made. Plans quantity will be used for payment. If changes are ordered by the Engineer, the volume will be measured to the nearest 0.1 cubic yard and the quantity adjusted.
464.5BASIS OF PAYMENT
Controlled density fill will be paid for at the contract unit price per cubic yard. Payment will be full compensation for furnishing and installing the controlled density fill and for all sandbags, equipment, labor, material, and all other incidental items required to complete the work. 465 Page 341465 DRILLED SHAFT CONSTRUCTION
465.1DESCRIPTION
This work consists of all labor, materials, equipment, and services required in the construction of drilled shafts.
465.2MATERIALS
A.Concrete: Drilled shaft concrete will conform to the requirements of Section 460, except as modified by this Section. B.Controlled Density Fill: Section 464. C.Casing: Casing will be smooth steel of sufficient thickness to withstand handling stresses, concrete pressure, surrounding earth and fluid pressures, and live load surcharges (if applicable). The casing will be of the diameter specified and will have teeth at the bottom to facilitate proper seating of the casing into the plans specified formation. D.Access Tubes for Crosshole Sonic Log (CSL) Testing: Access tubes will be 1.5 to 2 inch I.D. steel pipe conforming to ASTM A53. The selected pipes must have a round diameter free of defects or obstructions, including any at the pipe joints, to permit a free, unobstructed passage of the source and receiver probes. The pipes must be watertight and free from corrosion with clean internal and external faces to ensure smooth passage of the probes and to secure a good bond between the concrete and tubes. The pipes will each be fitted with a watertight shoe on the bottom, which can be penetrated from the surface to allow tip grouting, and a removable cap on the top. E.Grout: Grout for filling the access tubes at the completion of the CSL tests will conform to the requirements of Section 460.2 or will consist of Portland cement, water, and a water reducing admixture mixed in the following proportions: Portland Cement Type I or II........................ 1 Sack (94 lbs.) Water ............................................................ 4.5 Gallons Maximum Water Reducing Admixture .......................... Manufacturer’s Recommendation Fly Ash (Optional) ........................................ 20 Pounds Maximum
465.3CONSTRUCTION REQUIREMENTS
A.Concrete Quality and Proportioning: The Contractor will design and be responsible for the performance of the concrete mix. The concrete mix will have the following characteristics: 1.Minimum cementitious content of 750 pounds per cubic yard. The maximum cementitious content (total cement, fly ash, and other cementitious admixture) content will be 800 pounds per cubic yard. The Contractor will substitute a portion of the cement with Class F modified fly ash in accordance with Section 605. The amount of cement to be replaced will be 20% to 25% by weight. The ratio of substitution of fly ash to cement will be 1:1 by weight;