182 402.3.2 -Superpave Mix Designs: Fine aggregate shall meet the requirements of 702.3 along with the addition of the fine aggregate angularity and sand equivalent requirements noted in MP 401.02.28, Table 401.02.28C.
402.4 -MIXING : The skid resistant paving mix shall be type designated on the plans.
402.5 -MEASURMENT AND PAYMENT : Method of measurement and basis of payment will be in accordance with the applicable sections of Section 401.
402.6-PAY ITEM : ITEM DESCRIPTION UNIT 402001 -* “design method” Asphalt Skid Resistant Pavement, “aggregate type”, Type “mix type” Ton
Sequence number “design method” shall be either Marshall or Superpave “aggregate type” shall be either stone and gravel or slag “mix type” from Table 401.4.2A or 401.4.2B
183 SECTION 403 CRACK SEALING IN ASPHALT PAVEMENT
403.1 -DESCRIPTION : The work shall consist of the cleaning, crack sealing, and crack filling in asphalt pavement in the manner and subject to the conditions and regulations prescribed.
403.2 -MATERIALS : The material shall be hot poured crack sealant and conform to the requirements of Section 708.3 of the Specifications. The material must be compatible with asphalt pavement recycling.
403.3 -WEATHER RESTRICTIONS : The sealant material shall not be applied when the weather is foggy, rainy or when the ambient and pavement temperatures are below 40 F.
403.4 -CONSTRUCTION : 403.4.1 -Preparation of Material for Use: Before charging the compound into the melting unit, the units hall be free from all foreign material. If the type of heater to be used requires that the sealing material, as shipped, be cut into smaller pieces before melting, the cutting method used is subject to the approval by the Engineer. The heating kettle use d for melting sealing materials shall be of the indirect heating or double boiler type, using oil as the heat transfer medium. It shall have a thermostatically controlled heat source, a built -in automatic agitator, and thermometers installed to indicate both the temperature of the melted sealing material and that of the oil bath. Other methods of indirect heating approved by the Engineer may be used. A positive means of controlling the temperature of the heat transfer at all points in the system shall be in corporated in the heater. Sealing material shall be uniformly heated until the pouring temperature recommended by the manufacturer is reached. Should the maximum pouring temperature recommended be exceeded, the material will be rejected. The material shall be poured as soon as possible after the pouring temperature is reached. Only sufficient material for the day's operation shall be heated each day.
403.4.2 -Preparation of Joints and Cracks for Sealing: The cracks shall be thoroughly cleaned of all loos e scale, dirt, dust, vegetation, or other foreign matter prior to placing hot poured crack sealant. This shall be accomplished by use of a hot air lance, and any other tools necessary to complete the work. The use of any tool which results in damage to th e pavement is prohibited.
403.4.3 -Equipment for Applying Sealer: The equipment used shall conform to the manufacturers recommendations and consist of heating units from which material may be discharged into the crack through the use of flexible lines a nd suitable shoes.
403.4.4 -Placement Requirements: Any spillage of sealing material on pavements shall be immediately removed. A neat and workmanlike job will be required at all times. At no time shall sealing material be placed in a crack which is ei ther dirty or wet. The crack shall be clean and surface dry at the time of placement. Work will be suspended when cracks are wet or damp and when the atmospheric temperature is below 40 degrees. The standard overband shall be
184 three ( 3) inch centered over t he crack. After the sealant has cooled, settling shall not exceed 3/8 inch below the surface. Any damage to uncured sealant shall be repaired at the contractor’s expense. Cracks wider than one ( 1) inch and deeper than three ( 3) inch shouldn’t be sealed to avoid improper sealing. If no overlay work is being performed then no more than 25% of the surface area is to be crack sealed, due to danger of diminished skid resistance. Spalling, adhesive failure, or cohesive failure within 96 hours of installations hall be replaced at no additional cost.
403.4.5 -Equipment, Personnel, and Documentation Requirements: The Contractor (two (2) days prior to commencement of the project) shall submit to the Engineer a detailed list of all equipment to be used for crack sealing on the project. The Contractor shall also provide certification from the Sealing material manufacturer that the Contractor is qualified to apply the manufacturer's material in conformance with these specifications and the manufacture’s recommendations. The Contractor is responsible for quality control, and shall submit a quality control plan in accordance with these specifications to the Engineer at the Pre -Construction Conference.
403.5 -METHOD OF MEASUREMENT : The quantity of work done will be measured in linear feet of “Crack Sealing in Asphalt Pavement” applied and accepted.
403.6 -BASIS OF PAYMENT : The quantity of work, as determined above, will be paid for at the contract unit price bid for the item below, which price and payment shall be full compensation for furnishing all materials, and doing all the work prescribed i n a workmanlike and acceptable manner, including all the labor, tools, equipment, supplies and incidentals necessary to complete the work.
403.7 -PAY ITEM : ITEM DESCRIPTION UNIT 403001 -* Crack Sealing in Asphalt Pavement Linear Foot
* Sequence Number
185 SECTION 405 CHIP SEALS
405.1 -DESCRIPTION : This work shall consist of the construction of a wearing course, composed of asphalt emulsion immediately followed by a single layer of aggregate, in one or more applications, followed by a fog seal. The type of Chip Seal will be indicated on the Plans. The contractor shall notify the Engineer a minimum of two weeks p rior to starting any Chip Seal operation. In addition, the contractor shall submit proposed sources of all materials.
405.2 -MATERIALS : 405.2.1 -Aggregate: The aggregate shall be from a Division approved source and sha ll conform to the requirements of the Section 703.1 -4. The aggregate shall be washed to reduce dust content. The aggregates shall be crushed with a minimum of 80% two face fracture. Aggregates shall meet the gradation requirements of Table 405.2.1:
TABLE 405.2.1 Aggregate Gradation Requirements for Chip Seal Sieve Size Type A Type B Type C Nominal Maximum Size No. 67 No. 8 No. 9 1 in (25 mm) 100 – – 3/4 in (19 mm) 90-100 100 – 1/2 in (12.5 mm) 100 – 3/8 in (9.5 mm) 20-55 85-100 100 No. 4 (4.75 mm) 0-10 10-30 85-100 No. 8 (2.36 mm) 0-5 0-10 10-40 No. 16 (1.18mm) – 0-10 No. 30 (600 µm) – – No 50 (300 µm) – – 0-5 No. 200 (75 µm) 0-2 0-2 0-2
405.2.2 -Asphalt Emulsion: The asphalt emulsion for Chip Seals and the emulsion for the fog seal shall be from a Division approved source and shall meet the requirements of AASHTO M 316, Table 1. Other asphalt emulsions may be used with testing and approval prior to construction. Testing shall be done a minimum of two weeks prior to the pro jected start date and follow the process outlined in Materials Procedure 401.02.25 Certification of Asphalt and Tar Shipping Terminals.
405.2.3 -Application Rate Design: The contractor shall perform a Chip Seal Design according to AASHTO PP 82 and submit to the Engineer at least one week prior to starting work.