350 Page 204350 ASPHALT CONCRETE CRACK SEALING
350.1DESCRIPTION
This work will consist of routing and sealing transverse and longitudinal cracks in an asphalt concrete roadway surface with the specified sealant.
350.2MATERIALS
Asphalt concrete crack sealant will conform to Section 871.
350.3CONSTRUCTION REQUIREMENTS
A.Routing 1.Routing equipment will be mechanical, power driven, and capable of cutting a reservoir to the required dimensions. Equipment designed to plow the cracks to dimension will not be permitted. 2.Cracks which are less than 3/4 inch in width or depth will require routing to a width and depth of 3/4 to 7/8 inch. 3.Cracks which are 3/4 inch or greater in width and depth will not require routing but will be thoroughly cleaned of foreign material to a depth equal to the width of the crack. 4.The walls of the finished reservoir will be vertical, and the reservoir bottom will be flat. 5.Routing will not be allowed when the roadway is wet. B.Cleaning 1.Cleaning will be accomplished with an air compressor producing a minimum of 125 cubic feet per minute output and equipped with a maximum 3/4 inch nozzle. The air compressors will be equipped with traps capable of removing all free water and oil from the compressed air. 2.Reservoirs and cracks will be thoroughly cleaned of dust, dirt, and loose materials so the reservoir is clean and dry at the time the blocking medium or sealant is applied. 3.If a routed reservoir or crack is left overnight, the reservoir will be re-cleaned immediately before the blocking medium or sealant is applied. 4.The routed asphalt concrete and foreign material resulting from the reservoir preparation will be removed from the roadway surface before an area is opened to traffic. C.Sealing 1.Cracks 3/8 inches or greater in width, which exist below the routed and cleaned reservoir, will be filled with a blocking medium to ensure a nominal sealant depth equal to the width of the reservoir. 350 Page 2052.Sealant material will be placed within 72 hours of routing. 3.There will be no visible signs of moisture on the roadway surface or in the reservoir at the time the sealant is applied. 4.The sealant handling, mixing, and application temperature restrictions will conform to the manufacturer’s recommendations. 5.Sealant will be applied with a pressure type applicator. 6.When applying the sealant on all transverse cracks and any longitudinal cracks that are located more than 12 inches from a lane line, the reservoir will be overfilled and squeegeed to provide a film of sealant on the roadway surface 1 to 2 inches on both sides of the reservoir. When applying the sealant on longitudinal cracks that are located within 12 inches of a lane line, the reservoir will be overfilled and squeegeed to provide a film of sealant on the roadway surface up to 1 inch on both sides of the reservoir. 7.The squeegee will be a "U" shaped device which will produce a full, uniform, and neat appearing reservoir and adjoining surface area. Other type devices will require prior approval by the Engineer. 8.A blotting material, such as toilet tissue, or an approved de-tacking agent will be placed over the sealant material immediately after placement at intersections, superelevated curves, urban areas, grades steeper than 4%, and other locations specified on the plans. Blotting material or an approved de-tacking agent will be required when traffic is allowed to cross a sealed area before track free status has been achieved. 9.The Contractor will repair or refill, at the Contractor’s expense, any part of a sealed reservoir damaged by traffic. D.Seasonal and Temperature Limitations 1.Routing and sealing of asphalt concrete surfaces will be permitted only during daylight hours between April 1 and June 30 (inclusive) and between August 15 and November 30 (inclusive). 2.Application of the sealant material will only be allowed when the pavement surface temperature is at least 35F and rising. 3.Application of the sealant material will only be allowed when the ambient air temperature is between 40F and 85F. 4.Application of the sealant material will only be allowed when the relative humidity is less than 75%. 350 Page 206E.General 1.Only one-half of the roadway will be worked on at a time unless a traffic control plan to work full width is submitted by the Contractor and approved by the Engineer. 2.Routing and crack sealing will be considered as one work zone. A work zone will not exceed 2 miles in length at any one time.
350.4METHOD OF MEASUREMENT
Asphalt concrete crack sealing will be measured by the pound of sealant used. The manufacturer's weight of the sealant will be accepted as the basis for measurement. Quantities of asphalt concrete crack sealing with a manufacturer’s unit weight in excess of the specified unit weight will be reduced to the specified maximum unit weight prior to measurement for payment.
350.5BASIS OF PAYMENT
Asphalt concrete crack sealing will be paid at the contract unit price per pound and will be full compensation for routing and for furnishing, heating, placing, and blotting the sealant. Blocking medium will be incidental to the asphalt concrete crack sealing. Traffic control will be paid at the contract unit price. 360 Page 207360 ASPHALT SURFACE TREATMENT
360.1DESCRIPTION
This work consists of an application of asphalt covered with a spread of cover aggregate.
360.2MATERIALS
A.Asphalt: Asphalt will conform to Section 890. B.Cover Aggregate: Cover aggregate will conform to Section 881.
360.3CONSTRUCTION REQUIREMENTS
A.Weather and Seasonal Requirements: Surface treatment operations will be permitted only during daylight hours, when conditions are dry, when wind does not adversely affect the spraying operation, and when overnight low air temperatures within 24 hours of the planned application are forecasted to be at least 45°F. Minimum temperatures and seasonal limitations are as follows: Minimum Temperature and Seasonal Limitations Cover AggregatesAir and Surface Temperature (in the shade and rising)Seasonal Limitations (dates are inclusive) Type 1 60°F May 15 – Aug. 31 Type 2 60°F May 15 – Aug. 31 Type 3 60°F May 15 – Sept. 15 B.Equipment: The following equipment will be furnished: 1.Broom: a.Pickup Broom: In curb and gutter sections or in rural sections where a finished and maintained lawn extends to the edge of the shoulder, the Contractor will use a pickup broom with an integral self-contained storage. The pickup broom must be a minimum of 6 feet wide. While sweeping in curb and gutter sections, the sweeping operation must remove all loose material, including loose material from the gutter. b.Rotary Power Broom: A rotary power broom may be used in all other areas. 2.Equipment for heating and applying the asphalt conforming to the requirements of Section 330.3 C. 3.A self-propelled aggregate spreader, with positive controls capable of depositing the required quantity of aggregate uniformly over the full width of the asphalt application. 4.A minimum of four self-propelled pneumatic smooth tired rollers for each spreader in use. Each roller will completely cover an overall surface width of at least 60 inches and furnish a minimum uniform rolling weight (mass) of 250 pounds per of rolling width.