402.01 279 SECTION 402 – PRIME COAT
402.01 Description ................................ ................................ ................... 279
402.02 Materials ................................ ................................ ...................... 279
402.03 Equipment ................................ ................................ .................... 280
402.04 Limitations ................................ ................................ ................... 280
402.05 Preparing the Surface ................................ ................................ ... 280
402.06 Applying Priming Material ................................ .......................... 281
402.07 Applying Cover Material ................................ ............................. 281
402.08 Maintenance and Protection ................................ ......................... 281
402.09 Method of Measurement ................................ .............................. 282
402.10 Basis of Payment ................................ ................................ .......... 282
DESCRIPTION
402.01 Description
This work consists of applying bituminous material, and cover material if required, on a designated base. MATERIALS
402.02 Materials
Provide materials as specified in: Aggregate for Cover Material, Size 7, 8 , or 78 ...................... 903.13 Emulsified Asphalt, Grade AE -P, CAE-P, or tack coats in 403.02 ................................ ................................ ............... 904.03 When prime coat quantity is 6 tons or more, AE -P or CAE -P will be applied unless otherwise directed by the Department. Apply Emulsified Asphalt, Grade AE -P or CAE -P, at a temperature range of 60 to 140 °F. 402.03 280 When prime coat quantity is less than 6 tons, the use of emulsions for tack coat in 403.02 will be permitted. Dilute all tack coat emulsions with water at 1 part water to 1 part emulsion. EQUIPMENT
402.03 Equipment
Provide a power broom or ot her mechanical sweeping equipment, bituminous heating equipment, a water sprinkler, a pressure distributor, and such other equipment and small tools as may be required to perform the work in a satisfactory manner. The distributor shall be designed, equipped, maintained, and operated so that bituminous material at even heat may be applied uniformly on variable surface widths at readily determined and controlled rates from 0.05 to 0.5 gallons per square yard, with unifor m pressure, and with an allowable variation from any specified rate of plus or minus 0.02 gallons per square yard. Distributor equipment shall include: a tachometer, pressure gauges, accurate volume measuring devices, a calibrated tank, a thermometer for measuring the temperature of the material in the tank, a power unit for the pump, and full circulation spray bars that are adjustable laterally and vertically. CONSTRUCTION REQUIREMENTS
402.04 Limitations
When applying bituminous prime coat, adhere to th e same seasonal and temperature limitations as those specified for the succeeding stage of construction. The Contractor may apply the prime coat to a surface that is slightly damp, but never to a wet surface.
402.05 Preparing the Surface
Prepare the surface to be primed as specified in 303 or 310, whichever is applicable. 402.06 281 If delays in the priming operation occur, m aintain or rework the prepared surface to meet the requirements of 303 or 310, whichever is applicable, before resuming the priming operation.
402.06 Applying Priming Material
Before applying the treatment, obtain the Engineer’s approval of all areas to be treated. Apply and spread the bituminous material uniformly over the width of the section to be primed using a pressure distributor. The surface to be primed sh all be damp. Do not apply prime coat if there is standing water on the surface or if it has dried. If there is delay between preparing the surface and priming operation occur, lightly rewet the surface. If using AE -P or CAE -P, the Engineer will designa te the application rate within the extreme limits shown on the Plans. If using emulsion other than AE-P or CAE -P diluted at 1:1, the Engineer will designate the application rate of application 1.5 times the rate specified for AE -P or CAE -P. Maintain the a pplication temperatures within the ranges specified in 402.02. To correct areas containing an excess or deficiency of priming material, add blotter material or bituminous material, as directed by the Engineer. Protect all struc tures and concrete surfaces from the bituminous material during construction.
402.07 Applying Cover Material
If the bituminous material fails to penetrate before the time the roadway must be used by traffic, spread dry cove r material at a rate established by the Engineer, between 8 and 12 pounds per square yard, to prevent damage to the primed surface. Avoid applying an excess of cover material.
402.08 Maintenance and Protection
Maintain the prime coat and the surface intact until it has been covered by the wearing surface or the project is completed. Do not place any succeeding stage of construction upon the prime coat until i t has properly cured. Repair spots where the prime coat may have failed, due to disintegration of the underlying surface material or other reasons, as follows: 402.09 282 1. Lightly dampen t he exposed areas .
2.Refill such areas with approved material and thoroughly compact to conform with the surrounding surface .
3.Apply bituminous prime material to the surface with a hand spray. If this method cannot produce satisfactory repairs, fill the depressions with approved mixtures of bituminous material and fine aggregat e, and compact the mixture to conform to the surrounding surface. COMPENSATION
402.09 Method of Measurement
The Department will measure:
1.Bituminous material and cover material by the ton in accordance with 109.
2.Water used at the direction of the Engineer to dampen the base before applying bituminous materials by the M.G. (1,000 gallons), using calibrated tanks or distributors, or accurate water meters. Water used to dilute emulsified asphalt for tack coat will not be measured. The Department may use net certified weights as a basis of measurement for cover material aggregate, subject to correction for aggregate that is lost, wasted, or otherwise not incorporated in the Work.
402.10 Basis of Payment
The Department will pay for accepted quantities of Prime Coat, complete in place, at the contract prices as follows: Item Pay Unit Bituminous Material Ton Cover Material Ton Water MG 402.10 283 If using emulsion other than AE -P or CAE -P, payment wi ll be based on the undiluted weight of the emulsified asphalt. No payment will be made for the water required to dilute of the tack coat. If the prime coat is damaged due to causes beyond the Contractor’s control, the Department will pay, at the contract unit prices, for mineral aggregate and bituminous material used to repair the damaged areas as specified in 402.08. 403.01 284 SECTION 403 – TACK COAT
403.01 Des cription ................................ ................................ ................... 284
403.02 Bituminous Materials ................................ ................................ ... 284
403.03 Equipment ................................ ................................ .................... 285
403.04 Preparing the Surface ................................ ................................ ... 285
403.05 Applying Emulsified Asphalt ................................ ....................... 285
403.06 Method of Measurement ................................ .............................. 287
403.07 Basis of Payment ................................ ................................ .......... 287
DESCRIPTION
403.01 Description
This work consists of furnishing and applying emulsified asphalt to a previously prepared base or surface course to provide bond for a superimposed course. MATERIALS
403.02 Bituminous Materials
Provide materials as specified in: Emulsified Asphalt, SS -1, SS-1h, CSS-1, CSS-1h, TST-1P, CQS-1h, CQS-1hp, RS-1, CRS-1…………………………. 904.03 Approved Trackless Tac k………………………………………... QPL Apply tack coat at the temperature ranges specified in Table 403.02 -1.
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 288–292 of 1,072.