6−2 Table 1 Class of Concrete1 General Classification of Work X Structural & Precast Highway Bounds, Modular Wall Units, Elements Flared Ends, Drilled Shafts, Concrete-Filled Shell Piles. HP Structural & I-Beams, Cellular Slabs, Box Beams, Prestressed/Precast Cast-in-place Bridge Structures, Elements: Box Culverts, Retaining Walls, Backwalls, Beam Seats, Pier Caps, Pier Columns, Diaphragms, Abutment Stems, Pier Stems, Wall Stems, Bridge Decks, Railings, Parapets, End Posts, Bridge Sidewalks, Cast-in-place Piles, Reinforced Overhead Sign Foundations, Miscellaneous Prestressed/Precast Elements. XX Precast Elements: Collars, Catch Basins, Manholes, Drop Inlets, Sumps, Electrical Handholes, Median Barriers, Copings, Pipe. Structural Elements: Reinforced Footings, Approach Slabs. Miscellaneous: Road Pavements, Commercial Driveways, Headwalls, Endwalls, High Capacity Inlets, Road Base, Residential Driveways, Mast Arm Foundations. A Miscellaneous & Tremie Seals, Sidewalks, Fence Post Footings, General Use: Guardrail Anchorage, Unreinforced Footings, Paved Waterways, Concrete-Filled Pipe Piles, Non-specified use. Z Precast Elements: Curbing, Pipe. B General Use: Void Filler, Thrust Blocks, Class A Bedding. Notes: 1. All concrete shall be air entrained.
601.02 Materials.
601.02.1 Portland Cement. Portland cement shall conform to the requirements of SECTION
M.02; PORTLAND CEMENT CONCRETE, and be listed on the Department's Approved Materials List. For bridge projects, one brand of Portland cem ent shall be furnished and used for all visible portions of a structure, but is not required fo r interior deck slabs, beams or corresponding elements that are semi-exposed. The Contractor shall provide suitable means for storing and protecting the cement against dampness. Cement that becomes partially set or contains lumps of caked cement will be rejected. 6−3 All Portland cement used shall be supplied from mill silos that have cement which has been tested. A copy of a certified mill test report shall be furnished to the Engineer for the cement being used. Deliveries may be directed to the site or through a regional distribution base. No cement may be used for the project without a Certificate of Compliance issued by the manufacturer. In addition, the following will be required:
a.The manufacturer's Certificate of Compliance as referenced above and signed by the company representative having legal binding authorit y shall accompany each shipment of cement. The Certificate of Compliance shall conform to the Department's requirements. Copies of a standard form are available from the Department upon request.
b.Each shipment or truckload thus received will be sampled and tested by the Engineer. If rejected, the degree to which a structure has been affected by the use of this non-conforming product will be assessed and either the removal of the structure or an adjustment in price will be warranted.
c.Under all steps and conditions, delivery shall be made in weatherproofed and sealed transporting equipment. All cement shall be well protected from moisture and contaminants. Any cement which fails to meet any of the requi rements mentioned above shall be rejected and removed from the work. Any hydraulic cement stored by the Contractor for a period longer than 60 days shall be retested in accordance with AASHTO M85 by an independent laboratory at the Contractor's expense and approved by the Engineer before being used on the work. 601.02.2 Chemical Admixtures. Previously approved admixtu res shall be used when specified or ordered by the Engineer, or may be used at the Contractor's option if approved by the Engineer as described herein. Admixtures used in Portland cement concrete shall conform to the requirements of SECTION M.02 . No admixture shall be used in the work unless it is approved by the Engineer. Physical and chemical properties of admixtures shall be uniform throughout their use in the work. Should it be found that an admixture as furn ished is not uniform in properties, its use shall be discontinued. If more than one admixture type or brand is used, said admixtures shall be compatible with each other so that the desirable effects of all admixtures used will be realized. When the Contractor proposes to use an admix ture of a brand and type on the Department's Approved Materials List, he shall furnish a Certificate of Compliance from the manufacturer, certifying that the admixture furnished conforms to the chemical and physical requirements as specified by the Department. The Engineer may take samples for testing at any time. The cost of the admixtures, when approved for use, shall be distributed over the appropriate pay items at no extra compensation. The quantity of admixture used shall be in accordance with the manufacturer's recommended minimum and maximum dosage range. Air-entraining admixture shall be used in amounts to produce a concrete having the specified air-content. 6−4 Chemical admixtures, including air-entraining admixtures, shall be dispensed in liquid form. If more than one chemical admixture is used in t he concrete mix, a separate dispensing measuring unit shall be provided for each admixture. Dispensing shall be accomplished in accordance with manufacturer's approved recommendations. Dis pensers for chemical admixtures shall have sufficient capacity to measure at one time the prescribed quantity required for each batch of concrete. Each dispenser shall include a graduated measuring unit into which liquid admixtures are measured to within plus or minus 2 percent of the prescribed quantity (volume or weight, as applicable) for each batch of concrete. Dispensers shall be located and maintained so that the graduations can be accurately read from the point at which proportioning operations are controlled to permit a visual check of batching accuracy prior to discharge. Each dispensing unit shall be clearly marked for the type and quantity of admixture. Each liquid admixture dispensing system shall be equipped with a sampling device consisting of a valve located in a safe and readily accessible position such that a sample of the admixture may be withdrawn by the Engineer. For all types of admixtures, the water content as determined by manufacturer's recommendations and/or Departmental testing must be taken into account when calculating the total unit free water of the concrete mix. 601.02.3 Pozzolans . Mineral admixtures such as fly ash, blast furnace slag, and silica fume may be permitted as a partial replacement of Portl and cement in any concrete as approved by the Engineer. Mineral admixtures shall conform to the requirements of both Subsection M.02.06 and SECTION 602 of these Specifications, and furthermore, shall be listed on the Department's Approved Materials List. The Engineer will evaluate requests of alternate cement/pozzolans combinations in the concrete mix design. The Engineer's evaluation may include laboratory testing, field trial runs and other related work required to determine equivalency with specified materials, mix designs, and performance. The Contractor shall provide suitable means for storing and protecting the pozzolans against moisture. Pozzolans that become partially hydrated or contain lumps will be rejected. Handling and storage of all pozzolans shall conform to the requirements listed under Subsection 601.02.1; Portland Cement . The manufacturer's Certificate of Complianc e signed by a company representative having legal binding authority shall accompany each shipment of pozzolans. Any pozzolan stored by the Contractor for a period longer than 60 days shall be retested for compliance with the required specifications by an independent laboratory at the Contractor's expense and approved by the Engineer before being used on the work. 601.02.4 Aggregates . Coarse and Fine Aggregates shall conform to the requirements of Subsections M.01.05 and M.02.02 , respectively, of these Specifications.
a.Sources of Aggregates . Aggregates shall be obtained from sources which have been previously tested and approved by the State. Results and information of such tests may be obtained from the Engineer upon request. If the Contractor proposes to obtain aggregates from sources that have not been tested and approved, the Contractor shall:
1.Notify the State three months in advance of use, together with relevant test results in
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 254–256 of 826.