This master should be used by designers working on Port of Portland construction projects and by designers working for PDX tenants (“Tenants”). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and edited to fit specific project needs.

Select this section for all aprons and for areas which are likely to be damaged by fuel.

SECTION 321240–TIRE RUBBER MODIFIED SURFACE SEALER (TRMSS)

PART 1 - GENERAL

1.1DESCRIPTION

  1. This section describes the application of a petroleum-resistant,emulsified, cold-applied surface sealer.

1.2REFERENCES

  1. AASHTO: American Association of State Highway and Transportation Officials
  2. AASHTO T048: Standard Method of Test for Flash and Fire Points by Cleveland Open Cup
  3. AASHTO T049: Standard Method of Test for Penetration of Bituminous Materials
  4. AASHTO T053: Standard Method of Test for Softening Point of Bitumen (Ring-and-Ball Apparatus)
  5. ASTM: American Society for Testing and Materials
  6. ASTM D562: Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type Viscometer
  7. ASTM D2939: Standard Test Methods for Emulsified Bitumens Used as Protective Coatings
  8. ASTM G154: Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
  9. ASTM T44: Standard Test Method for Solubility of Asphalt Materials in Trichloroethylene
  10. ISSA: International Slurry Surfacing Association
  11. ISSA TB-100: Wet Track Abrasion of Slurry Surfaces

1.3SUBMITTALS

  1. Submit the manufacturer’s certification of source and properties of the sealer and the sand.
  2. Submit technical data on proposed application procedures and equipment a minimum of 21days prior to their intended use.

PART 2 - PRODUCTS

2.1ASPHALT EMULSION

  1. Capable of being applied completely by squeegee, brush, or other approved mechanical methods to the surface of bituminous pavements when spread at the specified rates.
  2. Tire Rubber Modified Surface Sealer (TRMSS) by Wright Asphalt Products Company, or a pre-bid approved equal meeting the requirements of the table below.

Property / Test Procedure / Min / Max
Tire rubber content, % / 10 / --
Viscosity, Krebs unit, 77°F / ASTM D562 / 45 / 85
Softening point, °F / AASHTO T531 / 250 / --
Uniformity / ASTM D2939 / Pass²
Resistance to heat / ASTM D2939 / Pass³
Resistance to water / ASTM D2939 / Pass4
Wet flow, mm / ASTM D2939 / -- / 0
Resistance to kerosene / ASTM D2939 / Pass5
Ultraviolet exposure, UVA-340, 0.77 W/m², 50°C, 8hr UV light, 5 min spray, 4h 55 min condensation, 1000hr total exposure / ASTM G154 / Pass6
Abrasion loss, 1.6 mm thickness, TRMSS liquid, % / ISSA TB-100 / -- / 1.5
Residue by evaporation, % by weight / ASTM D2939 / 33 / --
Tests on residue from evaporation:
Penetration, 77°F, 100 grams, 5 sec.
Flash Point, Cleveland, open cup, °F / AASHTO T49
AASHTO T48 / 12
500 / 30
--
Tests on base asphalt before emulsification, solubility in trichloroethylene, % / ASTM T44 / 98 / --

1Cure the TRMSS emulsion in the softening point ring in a 190°F ± 5°F oven for 90 minutes.

2Product shall be homogenous and show no separation or coagulation that cannot be overcome by moderate stirring.

3No sagging or slippage of film beyond the initial reference line.

4No blistering or re-emulsification.

5No absorption of kerosene into the clay tile past the sealer film. Note sealer surface condition and loss of adhesion.

6No cracking, chipping, surface distortion or loss of adhesion. No color fading or lightening.

2.2SAND OR SLAG

  1. Sand material shall consist of hard durable fragment particles of granular, dry, clean, dust-free slag with a Mohs hardness value of 7.5 to 8.0. Slag shall be black boiler sanding slag as supplied by Tru-Grit Abrasives, Inc., or pre-bid approved equal.
  2. The material shall meet the following gradation requirements:

Sieve Size / Percent Passing
U.S. No. 16 / 99-100
U.S. No. 20 / 99-100
U.S. No. 30 / 80-95
U.S. No. 40 / 35-60
U.S. No. 50 / 60-80
U.S. No. 60 / 0-5
U.S. No. 110 / 0-3
Pan / 0-2
All percentages are by weight.

2.3OIL SPOT PRIMER

  1. Treat petroleum spot areas with Prep Seal Oil Spot Primer No. A-500, or pre-bid approved equal.

PART 3 - EXECUTION

3.1EQUIPMENT

  1. All equipment used in the performance of the work shall be subject to Port approval and shall be maintained in satisfactory working condition at all times.
  2. Equipment for surface cleaning shall be capable of effectively removing oil, grease, dust, dirt, or other objectionable materials from the pavement surface prior to application of the surface sealer.
  3. Application equipment shall be a self-propelled distributor buggy or truck containing a mixing tank with a power agitator, and pressure pumps as required. The vehicle shall have a squeegee box containing at least two squeegee bars, each bar equipped with a flexible rubber type of material that is in contact with the pavement surface to work the slurry into the asphalt at a uniform rate.

3.2SURFACE PREPARATION

  1. Thoroughly clean all pavement surfaces with a regenerative-air vacuum sweeper before application of the surface sealer and dispose of material off of Port property.
  2. On newly constructed asphalt concrete, allow the surface to age for at least 90 days. The surface shall then be washed and thoroughly rinsed with water. Allow the cleaned pavement to dry completely before application of the surface sealer.
  3. Sweep pavement free of loose material, dirt, stones, dust, sand, and other objectionable materials that might adversely affect bonding of the emulsion or come loose after the emulsion has hardened.
  4. Pavement shall be clean and free of residues such as oil, petroleum,deicer, grease spots, or any other contaminants. Do not use solvents for cleaning. Treat petroleum spot areas with anoil spot primer as described in this Section.
  5. Where indicated or determined by the Port, remove pavement surfaces that have been softened and cut back by petroleum derivatives, or have failed from other causes, and replace with a hot plant mix asphalt concrete. Compact to match existing pavement in order to provide a surface texture comparable to that of the surrounding area. Prepare replacement areas as new pavement surfaces before application of the surface sealer.
  6. Seal pavement cracks and patch potholes and damaged areas prior to surface sealer application.

3.3PREPARATION OF EMULSION

  1. Thoroughly stir the emulsion in its container as received, preferably by a power mixer so that a creamy, homogeneous consistency of all material in the container is ensured for ready application.
  2. Do not add water to the asphalt emulsion product.

3.4PROPORTIONING SAND SLURRY

  1. Mix aggregate with the emulsion at a rate of 3pounds per gallon of emulsionbased on the oven-dry weight of the aggregate.

3.5MIXING SAND SLURRY

  1. Emulsion shall be charged into the mixer. Allow not less than 5 minutes for thorough blending of the materials. Dampened aggregate shall be introduced slowly during mixing to prevent segregation or clumping of the materials, and mixing shall be continued for a minimum of 5minutes after all aggregate has been added. The mixture shall be uniform and homogeneous and no slurry shall be accepted in which the emulsion has broken prior to spreading operations.

3.6WEATHER LIMITATIONS

  1. Minimum atmospheric temperature shall be 60ºF and rising.
  2. Do not apply the emulsion to wet pavement surfaces, during rainy or damp weather, or when rain is anticipated within 8hours after application is completed.

3.7APPLICATION

  1. Apply only when existing surface is clean and dry.
  2. Two-Coat System:
  3. Spread the first coat at a rate of approximately 0.10 gallons per square yard and include 3pounds of aggregate per gallon of undiluted emulsion.
  4. Spread the second coat ata cross direction to the first coat at a rate of 0.10gallons per square yard and include3 pounds of aggregate per gallon of undiluted emulsion. Apply 24hours after the first coat.
  5. Apply each coat with uniform coverage. Repair any pinholes or unsealed areas prior to the subsequent operation or prior to final acceptance in the case of the last coat.
  6. Allow each application to cure sufficiently so that the material will not adhere to the tires of vehicles before the next coat is applied. The curing period shall not be less than 4hours.
  7. One-Coat System:
  8. Spread the coatat a rate of0.15 gallons per square yard and include3pounds of aggregate per gallon of undiluted emulsion.
  9. Apply the coat with uniform coverage. Repair any pinholes or unsealed areas prior to final acceptance.
  10. Upon completion of the surface sealer placement, keep all traffic off the sealed surface for not less than 24hours or for a period of time directed by the Port.

END OF SECTION321239

10/28/2018 / TIRE RUBBER MODIFIED SURFACE SEALER (TRMSS)
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