00715.10 725 Section 00715 - Multiple Application Emulsified Asphalt Surface Treatment
Description
00715.00Scope - This Work consists of applying multiple layers of Emulsified Asphalt and graded
Aggregates, applied in successive spreads, to form a firm, finished surface as shown or directed.
The surface treatment design will be designated on the Plans or in the Special Provisions.
Materials
00715.10Aggregates - Furnish Aggregates meeting the following requirements:
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.
designated gradings for the specified multiple application Emulsified Asphalt surface treatment design according to the following:
Designated Size Sieve Size 1" - 1/2" 3/4" - 1/2" 1/2" - 1/4" 3/8" - No. 8 Percent Passing (by Weight) 1" 100 100 3/4" 95 - 100 90 - 100 100 1/2" 60 - 90 0 - 10 85 - 100 3/8" − − − 100 1/4" 15 - 30 0 - 2 0 - 15 − No. 4 − − − 45 - 65 No. 8 0 - 7 − 0 - 4 0 - 10 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
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.
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"
00715.11 726 (f) Harmful Substances - Provide Aggregates meeting the following harmful substances 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 all 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.
00715.11Emulsified Asphalt - Furnish polymer -modified Emulsified Asphalt or
non-polymer -modified Emulsified Asphalt as specified for the multiple application Emulsified Asphalt surface treatment 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.
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 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 surface treatment use. For this reason limit pumping between the bulk storage tank, hauling transportation, field storage tanks and distrib utor to an absolute minimum to maintain proper viscosity. Final acceptance of Emulsified Asphalt will be at the point of application.
Obtain Emulsified Asphalt samples according to AASHTO R 66 and Section 00165. Samples will be tested at the ODOT Materials Laboratory, or other laboratory as designated by the Agency. Non-polymer -modified Emulsified Asphalt will be tested within 30 Calendar Days from the date it is sampled. Polymer -modified Emulsified Asphalt will be tested within 14 Calendar Days from t he date it is sampled.
00715.21 727 00715.15 Aggregate 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 l ess 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 by Section 00165.
in 00195.60 subject to meeting the requirements of 00715.10 and 00715.15.
00715.16Acceptance of Aggregate - The Contractor ’s 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
00715.20Equipment - 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.
00715.21Asphalt 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 - 2.0 gallons per square yard, and with uniform pressure. T he 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. 00715.22 728
00715.22Chip 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.
00715.23Compactors - Provide self -propelled, pneumatic -tired or steel -wheeled rollers in good
condition and capable of operating at speeds compatible with the multiple application Emulsified Asphalt surface treatment operation. A minimum of two pneumatic -tired rollers and one steel -wheeled roller is requi red.
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.
00715.24Power Brooms - Provide pickup or non- pickup type power brooms equipped with a
positive means to control vertical pressure.
Labor
00715.30Quality Control Personnel - Provide a technician having a CAgT technical certification
Construction
00715.40Season 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 surface treatments damaged by weather during the first 24 hours after application at no additional cost to the Agency. The placing of multiple application Emulsified Asphalt surface treatments is not allowed before July 1 or after August 31.
00715.41Preparation of Underlying Surfaces - Prepare underlying surfaces according to the
following:
surface to be sealed and trim the Shoulders in a manner approved by the Engineer.
constructed under the Contract, to the completed and finished condition according to the applicable Specifications. Bring old Bases and foundations, constructed by others, to the applicable condition according to
00715.42Sequence of Operations and Application Rates - Construct the number of spreads, the
size of Aggregates, and the application rates for both Emulsified Asphalt and Aggregates for the multiple application Emulsified Asphalt surface treatment design specified according to Table 00715-1. Vary the rates of spread as directed during the progress of the Work to produce the 00715.42 729 best results. Surface treatment is not required for guardrail flares, driveways, or other irregular areas as di rected.
Table 00715-1 Multiple Surface Treatment Design Spreading Order and Fine Double Medium Double Type E -9 Type E -11 Rates of Spread* Chip Seal Chip Seal Oil Mat Oil Mat
First Course Emulsified Asphalt 0.20 0.25 0.30 0.30 1" - 1/2" Aggregate – – – 0.015 3/4" - 1/2" Aggregate – – 0.014 – 1/2" - 1/4" Aggregate – 0.010 – – 3/8" - No. 8 Aggregate 0.008 – – – Second Course Emulsified Asphalt 0.30 0.30 0.35 0.35 1" - 1/2" Aggregate – – – 0.015 1/2" - 1/4" Aggregate – – 0.010 – 3/8" - No.8 Aggregate 0.006 0.007 0.002 0.002 Third Course Emulsified Asphalt – – 0.30 0.35 1/2" - 1/4" Aggregate – – – 0.010 3/8" - No. 8 Aggregate – – 0.007 0.003 Fourth Course Emulsified Asphalt – – – 0.30 3/8" - No. 8 Aggregate – – – 0.007
Total Quantities Emulsified Asphalt 0.50 0.55 0.95 1.30 Aggregates 0.014 0.017 0.033 0.052
* The rates of spread are in the following units: Emulsified Asphalt - gallons per square yard Aggregates - cubic yards per square yard
the Engineer and Contractor for Type E -9 and E -11 oil mats:
• Complete first and second Course (and third Course for Type E -11) of the oil mat throughout the entire section (including the dry key) to which the oil mat is to be applied. Square up these Courses 3 hours prior to sunset each Day . Prior to applying third Course (fourth Course for Type E -11), lightly broo m any loose Aggregates from surface. Apply third or fourth Course (seal coat) throughout entire section. Square up the Courses 3 hours prior to sunset each Day . • Square up first and second Course (and third Course for Type E -11) of the oil mat 3 hours prior to sunset. 00715.43 730 • The following Day , prior to applying third Course (fourth Course for Type E -11), lightly broom any loose Aggregates from surface. Place the third or fourth Course (seal coat) of the oil mat and squar e up 3 hours prior to sunset. • Complete all Courses the same Day. Square up all Courses 3 hours prior to sunset.
the preceding Course, or as directed by the Engineer, at Project ends to provide a smooth transition to the existing Pavement .
00715.43Applying Emulsified Asphalt - Apply Emulsified Asphalt at the rates specified
in 00715.42 and according to the following:
• Apply Emulsified Asphalt , working toward the Aggregate stockpile at all times, unless otherwise approved. • Leave a minimum of 200 gallons of Emul sified 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 surface treatment. Apply the surface treatment, 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 c an be immediately covered by Aggregates before the emulsion 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.
00715.44Hauling and Spreading Aggregates - Spread Aggregates at the rates specified
in 00715.42.
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 surface treatment 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. 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. 00715.60 731 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. Stagger cut-offs of successive Courses a minimum of 16 feet prior to the end of a proceeding Course.
00715.45Shaping and Compacting - After the Agg regates have been placed on the Emulsified
Asphalt and spread, remove all piles, ridges or uneven distribution to ensure against rough spots in the final surface. Compact the surface with a minimum of four complete Coverages immediately behind the chip spreader. Perform additional C overages as directed by the Engineer until the Material is interlocked, firm, and partially bound with the underlying Emulsified Asphalt . The sequence of rollers will be as directed by the Engineer.
Operate rollers at speeds t hat do not damage 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. Begin rolling at the low side of the Cross Section and progress with Passes parallel to the Roadway centerline. Overlap each preceding P ass by at least one half the width of the roller.
Along curbs, walls and at all other places not accessible to specified rollers, thoroughly compact the Aggregate with mechanical tampers or hand tampers. Provide hand tampers with a weight of not less than 50 pounds and a tamping face of not more than 0.7 square foot.
Correct irregularities in Emulsified Asphalt distribution, surface smoothness, non-uniformity of texture, segregation of materials, dirt pockets, spots of excess asphalt and other deficiencies and defects. Accomplish this by the removal, rep lacement, addition of Material, repetition of construction operations or other suitable means, as directed or approved by the Engineer.
Maintenance
00715.60Establishment - During periods when partial construction is open to traffic and
for 7 Calendar Days following original completion of the final Course throughout the entire length of the Project, perform the following operations:
• Maintain the surface to correct bleeding of asphalt, keep the surface free of ravel, traffic grooves, holes and other deformations, and eliminate other defects that may appear. • Roll and compact the surface to maintain or restore firmness and stability to the M aterials. • Broom the surface to ensure that the surface is free of loose Aggregate. Discontinue brooming if the operation damages the surface. In curbed areas, use a pick up type power broom. On Bridges, sidewa lks and other areas off the R oadway, remove all loose Aggregates to the satisfaction of the Engineer.
Perform the above operations under traffic and at frequencies which the Engineer determines as being necessary to develop and establish the Course to uni form firmness and stability throughout.
00715.70 732 Finishing and Cleaning Up
00715.70Surface Tolerance - Provide a finished surface, after brooming, that does not vary by more
than 1/2 inch either transverse or perpendicular to centerline when tested with a 12-foot straightedge. Furnish and operate the straightedge under the observation of the Engineer.
00715.71Correction of Surface Deficiencies - Correct all deficiencies in surface tolerance in a
manner acceptable to the Engineer. Perform all corrective work within 14 Calendar Days following notification at no additional cost to the Agency.
Measurement
00715.80Measurement - 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 surface treatment of approaches will be measured on the unit basis for each street connection and road approach.
Payment
00715.90Payment - The accepted quantities of Work performed under this Section will be paid for
at the Contract unit price, per unit of measurement, for the following items:
Pay Item Unit of Measurement
Asphalt Surface Treatment ........................................................ Cubic Yard or Ton
Asphalt Surface Treatment .................................................................... Ton
Asphalt Surface Treatment Approaches ............................................... Each
Item (c) applies to the extra costs of placing the Aggregates and asphalt in Emulsified Asphalt surface treatment only on street connections and road approaches. Payment will be in additi on 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 Material in final position, or blading and brooming.