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Superpave Equivalency Table and Compacted Lift Thickness Range

Hveem

E. Placing Concrete in Cold Weather: No concrete shall be placed without the specific permission of the Engineer when the air temperature is at or below 35°F. If concreting in freezing weather is permitted by the Engineer, care shall be taken to prevent the use of any frozen material. In addition to adequate provisions for protecting the concrete against chilling or freezing, the Contractor shall heat the water and aggregate in order that when deposited in the forms, the concrete will have a temperature of not less than 55°F, nor more than 70°F. Heated water and aggregate shall be combined in the mixer before cement is added. Cement shall not be added to mixtures of water and aggregate when the temperature of the mixture is greater than 100°F. The concrete shall be adequately protected in order to maintain a minimum concrete temperature of 55°F for a minimum period of seventy two (72) hours [for “High Early Strength” concrete, a minimum period of forty-eight (48) hours]

after it has been placed and a temperature above 32°F for a period of two additional days.

The work shall be done entirely at the Contractor's risk; if the concrete is damaged then the Contractor shall replace it. No chemicals or other foreign matter shall be added to the concrete for the purpose of preventing freezing, and concrete shall not be placed on frozen ground.

F. Paving and surfacing materials shall not be placed when natural light is not sufficient to

properly observe work or operations.

2205.5 MATERIALS

A. Aggregate:. Mineral aggregates shall be in accordance with ODOT Sections 701, 703, or 704, depending on the intended use.

B. Bituminous Materials:

1. Petroleum asphalt cement: Petroleum asphalt cement shall be Grade AP-5, AP-4, or AP-3 and shall be homogeneous, free from water, and shall not foam when heated to 347°F.

2. Viscosity Asphalt Cement: Viscosity graded asphalt cement shall meet the requirements of AASHTO M 320 and shall be performance graded asphalt.

3. Cut-Back Asphalt: Cut-back asphalt shall be composed of an intimate homogeneous mixture of an asphalt base and a suitable distillate designed for rapid, medium, or slow curing. Cut-back asphalt may also contain an additive as an aid in uniformly coating wet, damp, or dry aggregates used in patching mixtures or bituminous pavements. The asphalt shall not contain more than 0.5% water as determined by AASHTO T55, shall not separate when allowed to stand, and shall not foam when heated to permissible temperatures. When an additive is used, it shall be incorporated homogeneously in the asphalt at the point of manufacture.

4. Prime Coat Materials: Bituminous materials for prime coat shall conform to ODOT Section 708.03 for Cut-back asphalt - MC-70; or MC-30, or Asphalt emulsion - AE-P, AE-PL 5. Tack Coat Materials: Bituminous materials for tack coat shall conform to ODOT Section

708.03 for Asphalt Emulsion - AE-T, SS1 and CSS1.

6. Seal Coat Materials: Bituminous materials for seal coat shall conform to ODOT section 708.03 for Asphalt Emulsion - RS-2, AE-90, AE-150.

C. Hot Asphalt Concrete Mixes

1. Hot asphalt concrete (HAC) mixture shall consist of an intimate mixture of coarse aggregate, fine aggregate including mineral filler if required, and asphalt cement combined in portions specified in this Section. The mixture proportions have been prepared on the basis of using rock or gravel aggregate.

2. When the use of one kind and size of aggregate is started, the use of that same kind and size shall be continued for the entire lift being constructed, unless otherwise directed by the Engineer.

3. Hot asphalt concrete mixtures shall comply with the following, unless otherwise shown or specified:

ODOT

Course Type Specifications Base S3 411 and 708-3 Surface S4 & S5 411 and 708-3

2200 - 12

D. Portland Cement Concrete

1. Cement shall be Portland cement and shall meet the requirements of ASTM Specification C 150, ACI 301, and ACI 318. Cement shall be Type 1 for normal use, Type 1A where air-entrainment is desired, or Type III or Type IIIA where high early strength is desired and authorized by the Engineer. Blended hydraulic cements which meet the requirements of ASTM Specification C 595 Type 1-P Portland-pozzolan cement may be used where a more watertight concrete is required. Cement shall meet the requirements of ODOT Section 414.

2. Aggregate: Regular fine and coarse aggregates shall meet the requirements of ASTM Specification C 33. Aggregate shall be crushed limestone with a maximum size of 3/4 inch, except in mass concrete the maximum size may be 1-1/2 inches.

3. Water shall be potable, clean, and free from injurious amounts of oils, acids, alkalis, organic materials, or other substances that may be deleterious to concrete or steel. A maximum of 500 mg/L of chloride ion may be present in the water.

E. Admixtures:

1. Air-entraining admixtures shall meet the requirements of AASHTO Specification M154.

2. Water-reducing and retarding admixtures shall meet the requirements of AASHTO Specification M154 and ODOT Section 701.01. The amount of admixture added to the concrete shall be in accordance with the manufacturer's requirements. Furnish a compliance statement that the admixture used satisfies all requirements of this specification.

3. Fly ash shall meet the chemical and physical requirements of ASTM C 618 for mineral admixture Class F, except loss on ignition shall not exceed 6%. Fly ash shall be sampled and tested in accordance with ASTM C 311 prior to use.

F. Reinforcement:

1. Reinforcing steel shall meet the requirements of ASTM Specification A 615, Grade 60.

2. Welded wire fabric or wire mesh shall meet the requirements of ASTM A 185.

G. Joint Filler:

1. Preformed expansion joint filler shall meet the requirements of ASTM Specification D 1752, Type III.

2. Hot-poured rubberized asphalt joint filler shall meet the requirements of ASTM Specification D-3405.

3. Waterproof expansion joint filler shall meet the requirements of ASTM Specification D 1850.

H. Materials for Curing Concrete Pavement: Concrete pavement shall be wet cured by using burlap, waterproof blankets, or ponding; or by using a membrane compound. If the membrane method is used, the compound shall be Type 2, complying with AASHTO M148 for white pigmented compound. A pressure sprayer capable of applying a continuous uniform film to the pavement surfaces will be required.

1. Concrete pavement shall meet the requirements of ODOT Section 414.

2. Concrete sidewalks and steps shall meet the requirements of ODOT Section 610.

3. Reinforced concrete for curbing shall meet the requirements of ODOT Section 609.

2205.6 CONSTRUCTION METHODS