ITEM 408 PRIME COAT
408.01
Description
408.02 Asphalt
Material
408.03 Cover
Aggregate
408.04 Weather
Limitations
408.05
Equipment
408.06
Preparation of Surface
408.07
Application of Asphalt Material
408.08
Application of Cover Aggregate
408.09 Method
of Measurement
408.10 Basis of
Payment
408.01 Description. This work consists of
preparing and treating an existing surface with asphalt material, and cover
aggregate if required.
408.02 Asphalt Material. Conform
to the applicable requirements of 702 for asphalt
material and use one of the following types: 702.02 MC-30, MC-70, or MC-250; or 702.03 Primer 20.
408.03 Cover Aggregate. Use cover aggregate
conforming to No. 9 size or gradation requirements of
703.05 or 703.06.
408.04 Weather Limitations. Do not
apply asphalt material on a wet surface. Do not apply prime coats for
asphalt concrete or surface treatment work when the atmospheric temperature is
below 50 °F (10 °C) or when the air temperature within the preceding 24 hours
has been 40 °F (5 °C) or lower. Do not apply prime coats on stabilized or
granular base courses when the atmospheric temperature is below 40 °F (5 °C).
408.05 Equipment. Use equipment conforming to 407.03.
408.06 Preparation of Surface. Shape the
surface to be primed to the required grade and section. Ensure the
surface is free from all ruts, corrugations, segregated material or other
irregularities and is smooth and uniformly compacted at the time of application
of the asphalt material. Clean the surface in a manner that will
thoroughly remove all mud, earth, and other foreign material. Take care
to clean the edges of road to be primed to ensure uniform application of the
asphalt material directly onto the existing base or pavement surface.
Remove material cleaned from the surface and dispose of it as the Engineer
directs.
408.07 Application of Asphalt Material. Apply
asphalt material in a uniform manner spread to the width of the section to be
primed by means of a distributor conforming to 407.03.
When traffic is maintained, do not treat more than one-half of the width of the
section in one application. Take care that the application of asphalt
material at the junction of spreads is not in excess of the specified
amount. Squeegee excess asphalt material from the surface. Correct
skipped areas or deficiencies.
When traffic is
maintained, allow one-way traffic on the untreated portion of the road
bed. As soon as the asphalt material has been absorbed by the surface and
will not be picked up, transfer traffic to the treated portion and prime the
remaining width of the section. Obtain the Engineer's approval for the
quantity, rate of application, temperatures and areas to be treated before
application of the prime coat.
408.08 Application of Cover Aggregate. If, after
applying the prime coat, the asphalt material fails to penetrate and traffic
must use the roadway, spread cover aggregate in the amount required to absorb
any excess asphalt material.
408.09 Method of Measurement. The
Department will measure Prime Coat by the number of gallons (liters) according
to 109.
408.10 Basis of Payment. The cost
of cover aggregate is incidental to Prime Coat.
The
Department will pay for accepted quantities, complete in place, at the contract
price as follows:
Item
Unit
Description
408
Gallon
(Liter)
Prime Coat