00705.11 701 PART 00700 - WEARING SURFACES Section 00705 - Emulsified Asphalt Prime Coat and Emulsified Asphalt Fog Coat Description
00705.00 Scope - This Work consists of applying asphalt, with or without Aggregate cover materials,
to a prepared surface. The prime coat referred to in these Specifications is a penetration treatment to Aggregate surfaces to coat and bind the material into a hard surface. The fog coat referred to in these Specifications is a treatment applied to existi ng asphalt concrete Pavement surfaces to renew and seal the Pavement surface. Materials
00705.10 Aggregate Cover Material - When required by the Special Provisions, furnish Aggregate
cover material consisting of crushed or uncrushed Rock free of Clay, loam or other harmful substances and meeting the following gradation. Sieve analysis will be determined according to AASHTO T 27. Sieve analysis may be waived and the Aggregate cover material accepted visually if allowed by the Engineer. Fine Cover Coarse Cover Percent Passing Percent Passing Sieve Size (by Weight) Sieve Size (by Weight) 3/8" 100 1" 100 1/4" 90 - 100 3/4" 90 - 100 No. 8 30 - 66 3/8" 55 - 75 No. 30 8 - 28 1/4" 40 - 60 No. 100 0 - 5 No. 8 * * Of the fraction passing the 1/4 inch sieve, 40 to 60 percent shall pass the No. 8 sieve.
00705.11 Emulsified Asphalt - Furnish asphalt meeting the following requirements:
a.General - Provide Emulsified Asphalt conforming to the requirement of ODOT's publication, Standard Specifications for Asphalt Materials . Copies of the publication are available from the ODOT Pavement Services Engineer. The applicable specifications are those contained in the current public ation on the date the Project is advertised. The materials may be conditionally accepted at the source or point of loading for transport to the Project. Obtain samples of Emulsified Asphalt according to AASHTO R 66, prior to dilution with water, accordin g to Section 00165. Samples will be tested at the ODOT Materials Laboratory, or other laboratory as designated by the Agency, within 30 Calendar Day s from the Day the sample was taken.
b.Prime Coat - Provide CSS -1, CSS -1h, or CMS -2S Emulsified Asphalt for the prime coat.
c.Fog Coat - Provide CSS-1, CSS -1h, or HFRS -P1 Emulsified Asphalt for the fog coat. For every part Emulsified Asphalt , add not more than one part water. Add water at point of supply or point of application as directed, and mix wi th Emulsified Asphalt . The exact proportion of added water will be determined in a manner acceptable to the Engineer. 00705.20 702 Equipment
00705.20 Equipment - Provide a pressure distributor, hauling vehicles, and other necessary
Equipment to ensure efficient op eration and construction to meet specified results. Provide Equipment in such number and capacities as will provide coordinated and uniform progress of the Work .
00705.21 Asphalt Distributor - Provide an asphalt distributor designed, equipped, maintained, and
operated so the Emulsified Asphalt Material is applied uniformly at even heat. The distributor shall be capable of applying the asphalt on variable surface widths up to 16 feet, at readily determined and controlled rates from 0.05 to 2.0 gallons per square yard, and with uniform pressure. The variation allowed from any specified rate shall not exceed 0.02 gallons per square yard. Provide distributor Equipment that includes a tachometer , pressure gauges, accurate volume measuring devices and a thermometer for measuring temperature of tank contents. Provide distributors equipped with a positive power unit for the asphalt pump, and full circulation spray bars adjustable both laterally and vertically. Set the bar height for triple lap coverage.
00705.22 Aggregate Spreaders - When Aggregate cover Material is required, provide a mechanical
spreading device that will spread the Aggregate cover Material in a manner acceptable to the Engineer.
00705.23 Power Brooms - When Aggregate cover Material is required, provide pickup or non-pickup
type power brooms equipped with a positive means to control vertical pressure. Construction
00705.40 Season and Weather Limitations - Do not place the prime coat or fog coat when the air
temperature is below 60 °F, or when the Engineer determines that weather or surface conditions are detrimental to proper construction.
00705.41 Preparation of Underlying Surfaces - Prepare underlying surfaces according to the
following:
a.Prime Coat - Bring Aggregate Bases and other Bases or foundations, when constructed under the Contract, to the completed and finished condition according to the applicable Specifications. Bring existing bases and foundations, constructed by others, to the applicable condition according to Section 00610, and within 0.04 foot of established grade and Cross Section .
b.Fog Coat - Apply the fog coat to a clean and dry surface. Clean and remove all loose material by sweeping or other approved methods.
00705.42 Sequence of Operations - Construct the prime coat or fog coat with a single spread of
asphalt followed immediately with a single spread of Aggregate cover Material, if required.
00705.43 Application of Asphalt - Apply asphalt according to the following:
a.Prime Coat - Apply asphalt at a uniform rate, normally within a range of 0.20 to 0.75 gallons per square yard of surface. The exact rate of application will be determined by the Engineer.
b.Fog Coat - Apply the diluted Emulsified Asphalt within the range of 0.10 to 0.15 gallons per square yard. The exact rate of applica tion will be determined by the Engineer. 00705.90 703 Discontinue application of the Emulsified Asphalt fog coat sufficiently early in the Day to permit the termination of traffic control prior to sunset. Apply Emulsified Asphalt to only one designated Traffic Lane at a time.
00705.44 Spreading Aggregate Cover Material - When Aggregate cover Material is required,
spread the Aggregate cover Material within the range of 0.004 to 0.013 cubic yards per square yard as directed. Maintenance
00705.60 Curing, Maintaining and Opening Prime Coat to Traffic - Cure the prime coat for a
minimum of 3 Calendar Day s after construction, as directed, before a succeeding Course is placed upon it. If directed, traffic m ay be allowed to travel over the prime coat at any time after its construction. During the curing period, when in use by traffic and until it is covered by a succeeding Course, maintain the prime coat to the specified shape and condition, as directed.
00705.61 Power Brooming Fog Coat - Following the applications of all Aggregate cover Material,
carefully broom the entire surface unless brooming damages the fog coat, to remove loose Aggregate that could damage vehicles. Use a m inimum of two power brooms. Subsequent brooming the following 2 D ays may be directed by the Engineer to ensure that the surface is free of loose Aggregate that could cause vehicle damage. In curbed areas, use a pickup type power broom. On Bridge s, sidew alks and other areas off the Roadway, remove all extraneous Aggregates to the satisfaction of the Engineer. Measurement
00705.80 Measurement - The quantities of Emulsified Asphalt will be measured on the weight basis.
The quantities of Aggregate cover Material will be measured on the weight basis or on the volume basis in the hauling vehicle. Payment
00705.90 Payment - The accepted quantities of Work performed under this Secti on will be paid for
at the Contract unit price, per unit of measurement, for the following items: Pay Item Unit of Measurement
a.Emulsified Asphalt in Prime Coat ........................................................... Ton
b.Emulsified Asphalt in Fog Coat .............................................................. Ton
c.Aggregate Cover Material .......................................................... Ton or Cubic Yard Item (b) includes water required to dilute the Emulsified Asphalt , according to 00705.11(c). Payment will be payment in full for furnishing and placing all Material s, and for furnishing all Equipment , labor, and Incidental s necessary to comple te the Work as specified. No separate or additional payment will be made for Materials used during the maintenance period.
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 767–769 of 1,268. View official source ↗