609Single Asphalt Surface Treatment

- SINGLE ASPHALT SURFACE TREATMENT SINGLE ASPHALT SURFACE TREATMENT

609.1DESCRIPTION

Construct a wearing surface composed of an asphalt prim e coat followed by the application of an asphalt surfacing and cover material as specified in the Contract Documents. B I D I T E M S U N I T S C o v e r M a t e r i a l ( * ) C u b i c Y a r d C u t b a c k A s p h a l t ( * ) ( * * ) T o n Emulsified Asphalt (*) (**) Ton Asphalt Cement (*) (**) Ton Water (Flexible Pavement) (Set Price) M Gallon Manipulation (S.A.S.T.) Station *Type and Grade **"Prime" denotes material to be used for prime. "Seal" denotes material to be used for seal.

609.2MATERIALS

Provide materials that comply with the applicable requirements. Aggregates for Cover Material .............................................................................. DIVISION 1100 Asphalt Material .................................................................................................... DIVISION 1200 Water ..................................................................................................................... DIVISION 2400

609.3CONSTRUCTION REQUIREMENTS

the surface of the roadbed to a smooth, un iform section. Remove all loose mate rials. Shape, blade and broom side roads that receive asphalt treatment, at the same time as the roadbed surface. When required by the Engineer, give the water-bound base course or subgrade a light application of water (approximately 0.1 gallon per square yard) before the asphalt material is applied.

treated. Broom surface to remove dust. When required by the Engineer, give the asphalt surface a light application of water (approximately 0.1 gallon per square yard) before the asphalt material is applied.

appurtenances from damage or splatter of asphalt material. Restore any damaged or splattered appurtenances to their original condition at own expense.

specified in TABLE 601-1, or as shown on the producer’s Bill of Lading.

subbases as soon as practicable after they have been prepared and are sufficiently dry. Apply the prime coat to asphalt su rfaces immediately after final rolling and before any traffic has been allowed, or when the surface has hardened and glazed so penetration of asphalt material is hindered. Using a distributor (see subsection 155.2 ), uniformly apply asphalt material at the rate shown in the Contract Documents. Frequently check and adjust the spray nozzles and spray bar to obtain uniform distribution. Should any nozzle malfunction, immediately stop distribution. Correct any deficiency before distribution is resumed. Only use hand sprayers for areas that can not be primed by normal operation of the distributor. - SINGLE ASPHALT SURFACE TREATMENT

subgrade, and before applying asphalt material, clean the surface to be treated of all foreign material and broom it as necessary to remove dust.

the rate shown in the Contract Documents. Equip and operate the distributor to prevent asphalt material from dripping on the pavement. At the beginning of each spread, use a strip of building paper, approximately 3 feet in width and 1 foot longer than the spray bar. If the spray cut-off is not positive, use paper at the end of each spread. Remove the paper and dispose of it in a satisfactory manner. Open the spray bar when the distributor is moving forward at proper speed, unless it is equipped to apply the specified rate from a standing start. Co rrect any skipped areas or deficiencies. Carefully make junctions of spreads to obtain a smooth riding surface. Do not spread more asphalt material than can be immediately covered. Do not allow the asphalt material to remain uncovered long enough to impair retention of the cover material. Do not exceed the spread width of the cover material with the spread width of asphalt material by more than 6 inches. Regulate the distribution of the asphalt material to obtain a uniform application. Do not allow the distributor to "blow". Frequently check and adjust the angle of the spray nozzles and the height of the spray bar to obtain uniform distribution. If the rise of the spray bar as the load is removed is excessive and contributes to drilling and streaking, modify the distributor to maintain a constant spray bar height. Should any nozzle malfunction, immediately stop distribution. Correct any deficiency before distribution is resumed.

spread cover material with a self-propelled aggregate spreader in quantities designated in the Contract Documents. The tires of the trucks or aggregate spreaders shall not come in contact with the fresh asphalt material at any time. Do not allow the asphalt material to remain uncovered long enough to impair retention of the cover material. Do not apply the spread width of the cover material greater than 6 inches wide r than the spread width of asphalt material. Uniformly cover the asphalt before rolling. Equip an d operate spreading equipment to provide complete coverage. Brooming, dragging or blading of the cover ma terial is prohibited before initial rolling. Perform any rearrangement of the cover material by hand methods. Avoid overlapping applications of cover material and remove all spillage from the surface. At the time of delivery to the roadway, the moisture content of the cover material shall not exceed 3% by weight plus ½ the water absorption of the aggregate. Do not let free moisture drain from the truck. The moisture limitations do not apply if lightweight aggregate is used. When directed by the Engineer, moisten the cover material with water to eliminate or reduce the dust coating of the aggregate. Perform the moistening the day before the aggregate is used. Any operation of equipment that resu lts in displacement of the cover material or damage to the seal course is prohibited.

shown in the Contract Documents, the quantities of aggregate and asphalt material are for the purpose of estimating and bidding only. Once the Contractor designates the alternate type of aggregate to be supplied, the total quantities to be used and paid for are determined by using the application rates in TABLE 608-1. No change in the contract unit price will be made. The application rate shown in TABLE 608-1 may be changed with written approval from the Engineer. If the quantity of cover material computed from TABLE 608-1 exceeds the amount used on the roadway, the Engineer will designate a stockpile location for this excess quantity. Locate the stockpile along the project, or at locations requiring a haul distance no longer than the most distant end of the project. The maximum quantity of cover material to be stockpiled is as follows: • The amount shown on the Contract Documents minus the amount used on the road when one type of cover material is shown in the Contract Documents. • The amount determined by using the application rates in TABLE 608-1 minus the amount used on the road when alternate types of cover material are shown in the Contract Documents. - SINGLE ASPHALT SURFACE TREATMENT • The amount specified by the Engineer minus the amount used on the road when the Engineer changes the application rates in TABLE 608-1. Payment for the stockpiled material will be at the contract unit price per cubic yard of cover material.

using pneumatic rolling. Provide a sufficient number of pneumatic rollers to complete the initial roller coverage within 15 minutes after the application of cover material. Continue pneumatic rolling until a total of 7 complete coverages are obtained. Keep the speed of rollers such th at aggregate displacement is minimized. Vary the weight of the rollers to embed the cover material as shown in the Contract Documents. If emulsified asphalt is used, cure the asphalt material a minimum of 4 hours before opening the roadway to unrestricted traffic. If polymer modi fied emulsified asphalt is used, the cu re time shall be a minimum of 1 ½ hours before the traveled way is opened to unre stricted traffic. If traffic causes ex cessive chip loss, increase the cure time until excessive chip loss is eliminated. On seals using CM-A, B or E, the Engineer may require the use of a steel roller for one of the coverages, provided excessive crushing of the cover material does not occur. Control the rolling sequence so it shall be unnecessary for one roller to turn out to permit another roller to pass. Do not turn rollers on the sealed surface. When required, apply additional cover material and roll it with the pneumatic rollers as directed by the Engineer. Provide self-propelled rollers. Broom the loose cover material from the surface of the traveled way as soon as the asphalt material has cured enough to prevent damage by brooming or vehicular traffic. Continue periodic brooming until all loose aggregate has been removed. Perform a minimum of 1 light brooming of the cover material before opening to traffic. Additional broomings may be required before opening to traffic to prevent the cover material from being picked up by moving vehicles. Broom excess cover material from the shoulder. The Contractor may seal in 1 lane for the entire day. When CM-B and cutback asphalt are specified in the Contract Documents, begin a second period of manipulation on the day following the first rolling, or as soon thereafter as weather conditions permit. This manipulation consists of spreading the loose cover material uniformly over the surface and rolling with the type of rollers specified by the Engineer. The rolling operation consists of 2 complete coverages of the previous day’s work. Following the second day’s rolling, broom excess cover material off the traveled way and shoulders, as directed by the Engineer.

to completed portions of the project. All additional asphalt material and aggregate so ordered will be included in the pay quantities. Spreading and rolling of additional aggregate will not be paid fo r separately. It is considered as subsidiary to the item of "Manipulation (S.A.S.T.)". If the shoulder vegetation is not sufficient to define the edge of the traveled way, broom and blade the excess cover material off the shoulder to provide delineation.

and entrances, mailbox turnouts, etc. having asphalt surfaces. Seal all widened areas. Asphalt and cover material for this work is included in the contract quantities and will be paid for at the contract unit price.

temperature is 60ºF and rising.

air temperature is 60ºF and rising, and the pavement temperature is a minimum of 70ºF.

temperature is 70ºF and rising, and the pavement temperature is a minimum of 80ºF. When aggregate retention is unsatisfactory, suspend sea ling. Do not seal when the surface is wet, or the weather is foggy or rainy. These limitations may be modified with written approval from the Engineer. If the seal is damaged or lost, due to rain or wet pavement, repair or re-seal the damaged pavement. - SINGLE ASPHALT SURFACE TREATMENT

eligible for pay adjustments.

609.4MEASUREMENT AND PAYMENT

The Engineer will measure cover material by the cubic yard. The material will be measured in the vehicle at the time and place of unloading. No deductions will be made for moisture in the cover material. The Engineer will measure asphalt material by the ton. Deductions will be made for the number of tons that are not placed on the road surface. The Engineer will measure manipulation by the Station, along the centerline. On divided highways, the Engineer will measure manipulation by the Station, along the centerline of each divided direction. This includes all widened and irregular areas and irregular variations in depth. The Engineer will measure ordered water by the M Gallon by means of calibrated tanks or water meters. Payment for "Cover Material", "Cutback Asphalt", "Emulsified Asphalt", "Asphalt Cement" and "Manipulation (S.A.S.T.)" at the contract unit prices and "Water (Flexible Pavement) (Set Price)" at the contract set unit price is full compensation for the specified work. When the Contract Documents call for asphalt cement for asphalt sealing, the following provisions apply:  If the work is not completed by September 1, and when ordered by the District Engineer in writing, change the type of asphalt material to cutback asphalt.  If approved changes are made, the unit price for cutb ack asphalt will be the contract price for asphalt cement plus or minus the difference in the invoice pric e of the two materials at the refinery at the time of application. Such measurement and payment is full compensation for the work specified.