Sealcoating
Chicago and Northwest Indiana
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SPECIFICATION FOR COAL TAR EMULSIFIED PAVEMENT SEALER
1) SCOPE:
This recommended practice covers the application of mineral-colloid-stabilized emulsified coal tar pitch pavement sealer. This application serves as weather protection, beautification of surface, and solvent resistant sealer for bituminous pavements of Parking lots.
2) REFERENCES:
A) Federal Specification RP - 355e
B) ASTM Specification D - 3320
3) MATERIALS:
A) Emulsified coal tar pitch pavement sealer, Brewer cote or equal, will
conform to the following requirements:
1) Federal specification RP-355e
2) The tar pitch prior to emulsification shall conform to ASTM D-490 grade RT-12. Oil and gas tars shall not be used even though they might comply with ASTM D-490
3) The emulsion shall be produced using a colloid mill to insure homogeneity and appropriate size particles in suspension. Only ball clays will be acceptable.
4) The contractor will provide a certification with each emulsion delivery indicating compliance with above requirements.
5) Water used as diluents shall be potable and free of excessive minerals and contaminants
B) Sand aggregate will be washed and graded silica sand, free of all contaminant and conforming to the following gradation:
Sieve size #40-60 with 100% passing on #20 sieve.
C) Latex additive - Tarmax R-100 or equal. The additive must mix homogeneously and be completely compatible with the coal tar emulsion, water, and sand system.
4) EQUIPMENT:
All tools and equipment necessary to perform the contract in accordance with the specified terms and conditions, such as brushes, hand squeegees, pumps and hose equipment, storage tanks, mixing tanks, power sweepers, blowers, barricades and applicator equipment shall be provided as required by the contractor. All methods employed in performing the work and all equipment necessary for executing any part of this work shall be subject to approval by the project administrator before work is started, and whenever found unsatisfactory will be changed. Distributors used on the job will have mechanical mixing devices incorporated in their construction to assure homogeneous mixing of the emulsion and required additives. No hand mixing equipment will be allowed. The distribution system must be adequate to apply a uniform coating at the specified rates of application.
5) PREPARATION OF SURFACE
A) Thoroughly inspect the pavement surface for minor cracks and other imperfections. Areas that have been subjected to fuel and oil spillage, shall be wire brushed or scraped to remove any excess dirt and grease accumulations. The area shall then be primed with an acrylic copolymer latex such as Tarloc to provide proper bonding on the sealcoat. Immediately before application of sealer, clean the surface of all loose dust, dirt, leaves, and any other foreign materials by sweeping, blowing, or flushing with water, or the combination of the three.
6) PREPARATION OF THE TAR EMULSION
A) Required coal tar emulsion mixture ratio.
Coal tar emulsion 100 gallons
Water 35 gallons
Latex additive 3 gallons
Sand 300 pounds
B) Aggregate shall be added at a slow uniform rate, after the mix water and latex additive have been dispersed into the tar emulsion. Slow mixing shall be continuous from the time all materials are placed into the mixer until the slurry is applied to the pavement.
7) APPLICATION : 2- COATS
A) First coat :
1) Application may be made by hand brushes, squeegees, or mechanical applicators. Coverage rate of 50-75 square feet per gallon.
2) Allow sealer to dry thoroughly before applying the second coat.
B) Second Coat :
1) The second coat shall be applied at right angles to the first coat.
2) Coverage rate of 75-100 square feet per gallon.
3) Allow the second coat to thoroughly dry before opening to traffic
C) Sealer will not be applied unless the air and surface temperature is 50% and rising. Sealer shall not be applied under rainy or wet conditions. The finished surface shall present a uniform appearance and texture. 8) STRIPING :
A) Striping will be done with an acrylic latex traffic paint.
B) Striping shall be placed in the existing configuration, and locations.
C) Striping shall be 4" wide, neatly sprayed with no over spray permitted.
9) CRACKFILLING : HOT APPLIED
A) Material to exceed federal specifications SS-S-164 WR Meadows HI-Spec or equal.
B) Prior to the application of crack sealer, cracks and joints over 3/8" shall be cleaned to remove all vegetation and debris from the cracks.
C) The cleaned cracks shall be sealed using a double oil jacketed melter.
D) The crack sealer shall be applied to provide a neat uniform band approximately 2" wide.
The above specifications should be modified to fit your need. Different weather climates require different specifications. The above specifications are for the Chicago area.
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