462 Page 336462 CONCRETE FOR INCIDENTAL CONSTRUCTION – CLASS M
462.1DESCRIPTION
This work consists of site preparation, form construction, and the furnishing, handling, placing, curing, and finishing of concrete for minor structures and incidental construction.
462.2MATERIALS
Material will conform to the following Sections: A.Cement: Section 750. Type II cement will be used, unless otherwise specified. B.Fine Aggregate: Section 800. C.Coarse Aggregate: Section 820. D.Water: Section 790. E.Admixtures: Section 751 and Section 752. F.Reinforcing Steel: Section 1010 . G.Curing Materials: Section 821. H.Preformed Expansion Joint Filler: Section 860. I.Joint Sealer: Section 870. J.Fly Ash: Section 605 and Section 753. K.Grout: Section 460.2 K.
462.3CONSTRUCTION REQUIREMENTS
The supplier of Class M concrete will be required to furnish a written statement certifying the concrete furnished meets the applicable requirements of Section 462 for Class M concrete. With the exception of Section 462.3 A, the requirements of Section 462.3 will not apply to Class M concrete produced at a commercial precast facility regularly producing other precast items under and Section 462.3 A. A.Concrete Quality and Proportion: The concrete specified in this section will be designated as Class M6 concrete. 1.The following requirements will apply for Class M6 concrete:
a.The concrete aggregate mixture will contain a minimum of 50% coarse aggregate by weight. 462 Page 337b.The mixture will contain at least 600 pounds of cement per cubic yard. c.The minimum 28 day compressive strength will be 4000 psi. When Class M6 concrete is specified, the design mix for Class A40 concrete may be substituted when approved. The 28 day compressive strength will be determined in accordance with Section 460.3 B. If the 28 day compressive strength is less than the specified 28 day compressive strength, the Department’s Concrete Engineer will evaluate the average compressive strength and determine if the concrete is structurally adequate. 2.Class M6 concrete will conform to the following slump and entrained air requirements: a.The slump at time of placement will be maintained between 1 inch and 4½ inches. When high range water reducing admixtures (HRWRA) are used at a commercial precast facility regularly producing other precast items under Section 560, the slump at time of precast concrete placements will be maintained between 4 inches and 8 inches. b.The entrained air content for cast in place concrete will be 6.5% plus 1.0% minus 1.5%. The entrained air content for precast concrete, cast at a commercial precast facility regularly producing other precast items under Section 560, will be 6.0% plus or minus 1.5%. B.Equipment: Equipment will conform to the following: 1.Batching Equipment: A concrete batch ticket will accompany each load of concrete to the project site and will be presented to the Engineer prior to discharging the load at the project site unless the Engineer approves an alternate procedure. The concrete batch ticket must contain the following minimum information: Date and time batched Total volume of the load, in cubic yards Actual weight (mass) or volume of each component of the mix: Coarse Aggregate Fine Aggregate Cement Fly Ash Admixtures Computerized batching equipment will conform to Section 460.3 C.2. 2.Mixing and Hauling Equipment: Mixers will be capable of combining the concrete ingredients into a thoroughly mixed and uniform mass and will uniformly discharge the concrete. 3.Forms: Wood and metal forms will conform to Section 460.3 C.4. 462 Page 338C.Mixing Concrete: Concrete mixing will conform to Section 460.3 E. D.Limitations of Mixing: Limitations of mixing will conform to Section 460.3 F. E.Delivery Requirements: Concrete delivery will conform to Section 460.3 G. F.Placing Concrete: Concrete placing will conform to Section 460.3 J. G.Underwater Concrete Placement: Depositing concrete in water will conform to Section 465.3 K. H.Surface Finish: Surface finish will conform to Section 460.3 L. I.Curing Concrete: Curing concrete will conform to Section 460.3 M. J.Protection of Concrete: Concrete will be protected in accordance with Section 460.3 N. K.Subsequent Construction: Removal of formwork, construction of superimposed elements, backfilling, and application of liveloads will conform to Section 460.3 O. and Section 460.3 P. L.Joints: Joints will conform to Section 460.3 Q.
462.4METHOD OF MEASUREMENT
Class M concrete will be measured in accordance with neat line dimensions shown on the plans, unless changes are ordered during construction. Volumes will be computed to the nearest 0.1 cubic yard.
Deductions will not be made for concrete displaced by pipes or conduits less than 6 inches in diameter, reinforcing and structural steel, weep holes, joints, drains, and chamfers or fillets less than one square inch in cross section.
462.5BASIS OF PAYMENT
The accepted quantity of Class M concrete will be paid for at contract unit price per cubic yard. Payment will be full compensation for labor, equipment, materials, and incidentals required for placing, finishing, and curing the concrete. 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