00710.00 712 Section 00710 - Single Appl ication Emulsified Asphalt Chip Seal
Description
00710.00Scope - This Work consists of applying Emulsified Asphalt and graded Aggregates as
shown or directed.
The chip seal design will be designated on the Plans or in the Special Provisions.
Materials
00710.10Aggregates - Furnish Aggregates meeting the following requirements:
chip seal design designated in the Plans or Special Provisions according to the following:
Chip Seal Design Size of Screenings
Fine 3/8" - No. 8 Single Size Medium 3/8" - 1/4" Graded Medium 3/8" - No. 4 Coarse 1/2" - 1/4"
combination of both. Crush Aggregate such that at least 90 percent by weight of the total Aggregate retained on the No. 8 and larger sieves is fractured on two faces, as determined according to AASHTO T 335.
grading for the designated single application Emulsified Asphalt chip seal design according to the following:
Sieve Coarse Single Size Medium Graded Medium Fine Size 1/2" - 1/4" 3/8" - 1/4" 3/8" - No. 4 3/8" - No. 8 Percent Passing (by Weight) 3/4" 100 1/2" 85 - 100 100 100 3/8" − 85 - 100 80 - 100 100 1/4" 0 - 15 0 - 15 10 - 40 − No. 4 − − − 45 - 65 No. 8 0 - 4 − 0 - 6 0 - 10 No. 30 − 0 - 2 0 - 2 − No. 200 (wet) 0.0 - 2.0 0.0 - 2.0 0.0 - 2.0 0.0 - 2.0 No. 200 (wet) * 0.0 - 1.0 0.0 - 1.0 0.0 - 1.0 0.0 - 1.0
* in gravels
- Provide Aggregate with a minimum unit weight of 90 pounds per cubic foot according to AASHTO T 19.
12 percent when subjected to five cycles of the soundness test using sodium sulfate solution according to AASHTO T 104.
00710.11 713 (f) Durability - Provide Aggregates meeting the following d urability requirements:
Test Method Maximum Test ODOT AASHTO Values
Abrasion T 96 30.0% Degradation ( Coarse Aggregate) Passing No. 20 Sieve TM 208 30.0% Sediment Height TM 208 3.0"
requirements:
Test Method Test ODOT AASHTO Limits
Lightweight Pieces T 113 1.0% maximum Wood Particles TM 225 0.1% maximum Elongated Pieces ( Coarse Aggregate at a ratio of 5:1) TM 229 10.0% maximum Cleanness Value TM 227 75 minimum
taken from Agency -controlled stockpiles, take the material in an orderly manner. Do not contaminate the materials. Salvage a ll material possible from the area which the material is taken. Shape unused portions of a stockpile to Neat Lines. The Contractor will be charged for materials wasted through negligence or used without authority.
temporarily stockpiled at approved sites on Agency property provided the areas used are as small as practicable. Restore the site to its original condition after the materials have been removed. Any contamination during storage or from reloading operations will be cause for rejection.
00710.11Emulsified Asphalt - Furnish polymer -modified Emulsified Asphalt or
non-polymer -modified Emulsified Asphalt as specified for the single application Emulsified Asphalt chip seal design designated in the Plans or Special Provisions. When non- polymer - modified Emulsified Asphalt is designated, the Contractor may elect to substitute a polymer -modified Emulsified Asphalt , however, selection of the polymer -modified Emulsified Asphalt will not be cause for additional compensation.
Asphalt is specified, use CRS -2 or HFRS -2 Emulsified Asphalt as the Contractor elects.
specified, use CRS -2P or HFRS-P1 as the Contractor elects.
requirements of ODOT's publication, Standard Specifications for Asphalt Materials . Copies of the publication are available from the ODOT Pavement Services Engi neer. The applicable Specifications are those contained in the current publication 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. Excessive delay in the use of the Emulsified Asphalt or excessive pumping of the Emulsified Asphalt may significantly reduce the viscosity and may make the material unsuitable for chip seal 00710.15 714 use. For this reason limit pumping between the bulk storage tank, hauling transportation, field storage tanks and distributor to an absolute minimum to maintain proper viscosity. Final acceptance of Emulsified Asphalt will be at the point of application. Obtain samples of Emulsified Asphalt according to AASHTO R 66 at the frequency accordin g to 30 Calendar Days from the date it is sampled. Polymer -modified Emulsified Asphalt will be tested within 14 Calendar Days from the date it is sampled.
00710.15Aggregate Production Quality Control - Provide sampling, testing, and quality control
during production of Aggregate according to Section 00165.
specification Aggregate when the Pay Factor (PF) for each sieve size calculated according to 00165.40 is equal to or greater than 1.00. Each required sample represents a sublot.
When the results from Table 00165-2 yield a Pay Factor of less than 1.00 for any sieve size, the material is non-specification. The Engineer will reject any stockpile of Aggregate containing non-specification material unless the non-specification material is removed from the stockpile. Do not add additional material to such a stockpile until enough non- specification material is removed so that the PF for each sieve size is equal to or greater than 1.00.
failing material from the stockpile whenever a quality control test result, other than sieve analysis, does not meet Specifications. Document operational adjustments made and notify the Engineer prior to resuming production.
Award of this Contract will be determined according to Section 00165.
in 00195.60 subject to meeting the requirements of 00710.10 and 00710.15.
00710.16Acceptance of Aggregate - The Contractors quality control tests will be used for
acceptance of Aggregates if verified by the Q uality Assurance Program. The Agency will perform Aggregate production quality assurance according to the following:
be performed according to Section 00165.
projects administered by other Agencies will be at the discretion of the Agency or as designated in the Special Provisions.
Equipment
00710.20Equipment - Provide a pressure distributor, hauling vehicles, chip spreader, compactors,
power brooms and other necessary Equipment to ensure efficient operation and construction to meet specified results. Provide Equipment in sufficient number and capacities that will provide coordinated and uniform progress of the Work .
Provide two -way radio communication between the asphalt distributor and chip spreader. 00710.42 715
00710.21Asphalt Distributor - Provide an asphalt distributor designed, equipped, maintained and
operated so the Emulsified Asphalt material may be 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 - 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 t ank 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.
00710.22Chip Spreaders - Provide self -propelled chip spreaders equipped with a mechanical
device that will spread the Aggregate at a uniform rate across the full width of the chip spreaders. Provide chip spreaders equipped with an Aggregate segregator assembly. Chip spreaders without an Aggregate segregator assembly may be allowed if approved by the Engineer. Provide chip spreaders of adequate width to provide full coverage of the specified P anel and without placing joints in the travel lanes.
00710.23Compactors - Provide self -propelled pneumatic -tired or steel -wheeled rollers in good
condition and capable of operating at speeds compatible with the chip seal operation. A minimum of two pneumatic -tired rollers and one steel -wheeled roller is required.
pneumatic -tired rollers with smooth-tread pneumatic tires of equal size. The tires shall be staggered on the axles at such spacings and overlaps that will provide uniform compacting pressure for the full compacting width of the roller. The minimum load per tire shall be 2,800 pounds, with tire inflation pressures of 45 psi to 90 psi.
least 8 Tons.
00710.24Power Brooms - Provide pickup or non- pickup type power brooms equipped with a
positive means to control vertical pres sure.
Labor
00710.30Quality Control Personnel - Provide a technician having a CAgT technical certification
Construction
00710.40Season and Weather Limitations - Do not apply Emulsified Asphalt when the Pavement
temperature is below 70 °F, or if the humidity is higher than 75 percent. Complete the application of the Emulsified Asphalt and the Aggregate 3 hours before sunset. Remove by milling, or other methods approved by the Engineer, and replace all chip seals damaged by weather during the first 24 hours after application at no additional cost to the Agency. The placing of single application Emulsified Asphalt chip seal is not allowed before July 1 or after August 31.
00710.41Rate of Progress and Scheduling - Do not apply more chip seal in any 1 Day than can
be broomed the following morning, unless approved by the Engineer. Provide a Traffic Control Plan for approval by the Engineer if operations exceed 3 centerline miles or 6 lane miles per Day .
00710.42Preparation of Underlying Surfaces - Immediately before applying the Emulsified
Asphalt , clean and dry the surface to be treated in a manner approved by the Engineer.
00710.43 716 00710.43 Sequence of Operations - Construct the single application Emulsified Asphal t chip seal with a single spread of Emulsified Asphalt followed immediately with a single spread of Aggregate and initial rolling, unless otherwise directed by the Engineer. Chip seal is not required for guardrail flares, driveways, or other irregular areas as directed.
00710.44Application Rates - Apply the Emulsified Asphalt and spread the Aggregate within the
following ranges of rates for the specified chip seal design. The exact application and spread rate will be determined by the Engineer.
Emulsified Asphalt Aggregate Chip Seal Design Application Rate Spread Rate (gal./sq. yd.) (cu. yd./sq. yd.) Fine 0.25 - 0.40 0.004 - 0.009 Single Size Medium 0.40 - 0.65 0.005 - 0.015 Graded Medium 0.40 - 0.65 0.005 - 0.015 Coarse 0.33 - 0.70 0.009 - 0.018
00710.45Applying Emulsified Asphalt - Apply Emulsified Asphalt at the rates specified
in 00710.44 and according to the following:
• Apply the Emulsified Asphalt working toward the Aggregate stockpile at all times, unless otherwise approved. • Leave a minimum of 200 gallons of Emulsified Asphalt in the distributor tank at all times. • Do not apply Emulsified Asphalt to more than one-half the width of the travel way at one time with the remaining width remaining open to traffic. Do not close the open lane until traffic controlled by pilot car is operating on the new chipse al. Apply the chip seal , weather permitting, to both sides of the travel way so that the end of the Work is squared up 3 hours before sunset. • Do not apply Emulsified Asphalt a greater distance than can be immediately covered by Aggregates before the emulsi on breaks. • Place building paper over the treated surface at the beginning of each spread to ensure that the nozzles are operating properly before the uncovered surface is reached. Remove and dispose of building paper in a manner satisfactory to the Engineer. • If requested by the Engineer, demonstrate that the distribution of the Emulsified Asphalt does not vary between the individual nozzles by more than 15 percent transversely from the average, and no more than 10 percent longitudinally from the specified rate of application. • Apply the Emulsified Asphalt at a temperature between 140 ° F and 185 °F as recommended by the manufacturer.
00710.46Hauling and Spreading Aggregates - Spread Aggregates at the rates specified
in 00710.44.
Do not operate hauling and spreading Equipment on uncovered Emulsified Asphalt . During the first hour after application of the Emulsified Asphalt and Aggregate, operate at speeds no more than 10 mph and after the first hour, not more than 15 mph until otherwise allowed by the Engineer. Carefully operate hauling Equipment at all times, at moderate speeds that will not damage the new chip seal or create a hazard to the traveling public. Route hauling Equipment and pilot lines as uniformly as possible over the full width of the new surface in place.
Calibrate the gate opening, gear selection and engine RPM of the chip spreaders for the various sizes of Aggregate to be used. Following calibration, verify the rate of application by a method acceptable to the Engineer.
00710.80 717 Immediately cover the Emulsified Asphalt surface with Aggregate unless otherwise authorized by the Engineer. Maintain the rate of spread of this Aggregate within 10 percent of specified rate. Using approved methods, remove or repair Emulsified Asphalt that has set or "broke" before being covered with Aggregate, at no additional cost to the Agency.
Aggregates shall be surface damp at the time of application. Excess free water (water not adhering to the Aggregate surface) on the Aggregate is not allowed. Do not operate the chip spreader at speeds which cause the chips to roll over after striking the emulsion covered surface.
Provide Coverage without gaps or overlapping adjacent C overages. Do not construct longitudinal joints within the travel lanes.
Construct neat transverse cut off of Aggregates and remove any excess Aggregates from the surface prior to resuming operations.
00710.47Shaping and Compacting - After the Aggregates have been placed on the Emulsified
Asphalt , spread or remove all piles, ridges, or uneven distribution to ensure against rough spots in the final surface. Compact the surface with a mini mum of two C overages with a pneumatic -tired roller and one Coverage with a steel -wheeled roller. Continue compacting until the Material is interlocked, firm and partially bound with the underlying Emulsified Asphalt . The sequence of roller Coverages may be adjusted at the discretion of the Engineer. Operate rollers at speeds such that the rollers do not pick up Aggregates from the surface. Do not exceed rolling speeds of 5 mph. In the event Aggregates begin to pick up under traffic or from the rolling operation, immediately cover and roll the area with additional quantities of Aggregate.
Maintenance
00710.60Power Brooming - Following the application of the chip seal , carefully broom the entire
surface to remove loose Aggregate. Discontinue the operation if brooming damages the chip seal . Use a minimum of two power brooms. Subsequent brooming the following 2 D ays may be directed by the Engineer to ensure t hat the surface is free of loose Aggregate that could cause vehicle damage. In curbed areas, use a pick -up type power broom. On Bridges, sidewalks and other areas off the Roadway, remove all loose Aggregates to the satisfaction of the Engineer.
Measurement
00710.80Measurement - The quantities of Aggregate will be measured on the weight basis or on
the volume basis in the hauling vehicle.
The quantities of Emulsified Asphalt will be measured on the weight basis.
The quantities of asphalt chip seal of approaches will be measured on the unit basis for each street connection and road approach.
00710.90 718 Payment
00710.90Payment - The accepted quantities of Work performed under thisS ection will be paid for
at the Contract unit price, per unit of measurement, for the following items:
Pay Item Unit of Measurement
Item (c) applies to the extra costs of placing the Aggregates and asphalt in single application Emulsified Asphalt chip seals only on street connections and road approaches. Payment will be in addition to payment made for the Materials used in the Work .
Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment , labor, and Incidentals necessary to complete the Work as specified.
No separate or additional payment will be made for preparing the road surface, placing Materials in final position, or brooming.