pavement marking material. Dust, dirt, and other granular surface deposits
shall be removed by sweeping, blowing with compressed air, rinsing with
water or a combination of these methods as required. Rubber deposits,
surface laitance, existing paint markings, and other coatings adhering to
the pavement shall be completely removed with scrapers, wire brushes,
sandblasting, approved chemicals, or mechanical abrasion as directed.
Areas of old pavement affected with oil or grease shall be scrubbed with
several applications of trisodium phosphate solution or other approved
detergent or degreaser, and rinsed thoroughly after each application.
After cleaning, oil-soaked areas shall be sealed with cut shellac to
prevent bleeding through the new paint. Pavement surfaces shall be allowed
to dry, when water is used for cleaning, prior to striping or marking.
Surfaces shall be recleaned, when work has been stopped due to rain.
3.1.1
Pretreatment for Early Painting
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NOTE: For new rigid pavements which require early
painting, the following paragraph will be added.
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Where early painting is required on rigid pavements, a pretreatment with an
aqueous solution containing 3 percent phosphoric acid and 2 percent zinc
chloride shall be applied to prepared pavement areas prior to painting.
3.1.2
Cleaning Existing Pavement Markings
In general, markings shall not be placed over existing pavement marking
patterns. Existing pavement markings, which are in good condition but
interfere or conflict with the newly applied marking patterns, shall be
removed. Deteriorated or obscured markings that are not misleading or
confusing or interfere with the adhesion of the new marking material do not
require removal. New preformed and thermoplastic pavement markings shall
not be applied over existing preformed or thermoplastic markings. Whenever
grinding, scraping, sandblasting or other operations are performed the work
must be conducted in such a manner that the finished pavement surface is
not damaged or left in a pattern that is misleading or confusing. When
these operations are completed the pavement surface shall be blown off with
compressed air to remove residue and debris resulting from the cleaning
work.
3.1.3
Cleaning Concrete Curing Compounds
On new Portland cement concrete pavements, cleaning operations shall not
begin until a minimum of 30 days after the placement of concrete. All new
concrete pavements shall be cleaned by either sandblasting or water
blasting. When water blasting is performed, thermoplastic and preformed
markings shall be applied no sooner than 24 hours after the blasting has
been completed. The extent of the blasting work shall be to clean and
prepare the concrete surface as follows:
a. There is no visible evidence of curing compound on the peaks of the
textured concrete surface.
b. There are no heavy puddled deposits of curing compound in the
valleys of the textured concrete surface.
c. All remaining curing compound is intact; all loose and flaking
material is removed.
SECTION 02763A
Page 15
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