Concrete shall be composed of portland cement, air-entraining agent, aggregates, and water. These materials shall be furnished only from sources of supply approved by the Planning Commission, or its duly authorized representative, before shipments are started. The basis of approval of such sources shall be the ability to produce materials of the quality and in the quantity required.
2.1 PORTLAND CEMENT: Cement of the type specified shall conform to requirements of the current ASTM Specifications for portland cement Type I, or Type III (Designation C-150). Cement which for any reason has become partially set or which contains lumps of caked cement shall be rejected. Either packaged or bulk cement may be used.
2.2 AIR-ENTRAINING AGENT: Air-entraining agents shall conform to the requirements of the current ASTM Specifications for air-entraining agents for concrete (Designation C-260).
2.3 CHEMICAL ADMIXTURES FOR CONCRETE: Admixture of the type specified shall conform to requirements of the current ASTM Specifications for admixtures of Type A and Type D (Designation C-494).
2.4 AGGREGATES: All aggregates for concrete shall meet the current standard requirements for concrete pavements of the Kentucky Department of Highways or the current ASTM Specification for concrete aggregates (Designation C-33).
Aggregates shall be so handled that moisture content and gradation are reasonably uniform and do not change appreciably from batch to batch or hour to hour.
No aggregates shall be used which have become contaminated or intermixed. Frozen aggregates or aggregates containing frozen lumps shall be thawed before use.
2.5 WATER: Water used in mixing or curing concrete shall be clean and free from injurious amounts of oil, acids, salt, alkali or organic materials or other substances harmful to concrete. Normally water from public supplies or which is suitable for drinking is always satisfactory.
2.6 REINFORCING STEEL: Reinforcing steel, if specified, shall conform to current Standard Specifications of the Kentucky Department of Highways.
Tie bars which are to be bent after one end is encased in concrete shall be structural grade.
2.7 JOINTS:
2.7.1 EXPANSION JOINTS: Expansion joints shall be non-extruding performed joint fillers and shall conform to current Standard Specifications of the Kentucky Department of Highways, the selection of the type will be at the contractor's option.
2.7.2 JOINT SEALING COMPOUND: Sealing material for filling all types of pavement joints shall comply with current Standard Specifications of the Kentucky Department of Highways, the selection of the type will be at the contractor's option.
2.7.3 PREMOLDED JOINT MATERIAL: Premolded parting strips, when called for on the plans, shall be at least 1/8 inch thick and of width shown on the plans. They shall consist of strips which have been formed from layers of felt or shredded felt, cane, wood or other suitable fibers, securely bound together and uniformly impregnated with a suitable binder. They shall be of such character that they will not be permanently deformed by ordinary handling during hot weather or become hard and brittle in cold weather.
2.8 CURING
2.8.1 BURLAP OR COTTON MATS: Shall at time of using be in good condition, free from holes, dirt, clay or any other substance which would have a deleterious effect upon concrete. Burlap or cotton mats shall be of quality specified by AASHO (Designation M-182 and M-73 respectively).
2.8.2 WATERPROOF PAPER OR PLASTIC SHEETS: For curing concrete shall conform to the current ASTM or AASHO Specifications for waterproof paper for curing concrete, C-171 and M-139 respectively. Moisture retention shall conform to the requirements of ASTM (Designation C-156).
2.8.3 MEMBRANE CURING COMPOUNDS: Shall be the white pigmented type and conform to the requirements for the current AASHO Standard Specifications for liquid membrane forming compounds for curing concrete (Designation M-148 or ASTM Designation C-309).
(Ord. 1971-2, passed 4-6-71)