2-Attachment+B+Chip+Seal+Coat+Special+Provision+(5).pdf

January 14, 2021

SPECIAL PROVISION

PROJECT #

PIN #

SECTION 02785S

CHIP SEAL COAT

Delete Section 02785 and replace with the following:

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Materials and procedures for applying emulsified asphalt, followed with an application of, either a standard chip seal cover material or lightweight chip seal cover material and bituminous flush coat.

B. Cover materials.

1.2 RELATED SECTIONS

A. Section 01554: Traffic Control

B. Section 01558: Temporary Pavement Markings

C. Section 02742S: Project Specific Surfacing Requirements

D. Section 02745: Asphalt Material

E. Section 02765: Pavement Marking Paint

1.3 REFERENCES

A. AASHTO T 11: Materials Finer Than 75 μm (No. 200) Sieve in Mineral Aggregates by Washing

B. AASHTO T 19: Unit Weight and Voids in Aggregate

C. AASHTO T 27: Sieve Analysis of Fine and Coarse Aggregates

D. AASHTO T 96: Resistance to Abrasion of Small Size Coarse

Aggregate by Use of the Los Angeles Machine

Chip Seal Coat 02785S – Page 1 of 10

E. AASHTO T 104: Soundness of Aggregates by Use of Sodium

Sulfate or Magnesium Sulfate

F. AASHTO T 278: Surface Frictional Properties Using the British Pendulum Tester

G. AASHTO T 279: Accelerated Polishing of Aggregates Using the British Wheel

H. AASHTO T 335: Determining the Percentage of Fracture in

Coarse Aggregate

I. UDOT Materials Manual of Instruction

J. UDOT Minimum Sampling and Testing Requirements

K. UDOT Quality Management Plan

1.4 DEFINITIONS Not Used

1.5 SUBMITTALS

A. Test reports for information that the cover material and emulsion meets requirements of this Section, Part 2.

B. Verification that the asphalt/polymer supplier adheres to UDOT

Quality Management Plan for Asphalt Emulsion 508.

C. All documentation verifying asphalt application rates, chip application, and other calibration verification for applied materials during the chip seal operations on a daily basis, or as requested by the Engineer.

D Vendor’s bill of lading upon delivery and certify the material was diluted according to this Section, Part 2.

1.6 ACCEPTANCE

A. Acceptance sampling and testing of material is according to UDOT Minimum Sampling and Testing Requirements.

PART 2 PRODUCTS

2.1 CATIONIC EMULSIONS

A. CRS-2A according to Section 02745.

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B. CRS-2P according to Section 02745.

C. LMCRS-2 according to Section 02745.

2.2 HIGH FLOAT EMULSIONS

A. HFRS-2P according to Section 02745.

B. HFMS-2 according to Section 02745.

C. HFMS-2P according to Section 02745.

2.3 FLUSH COAT

A. Use the emulsion as designated in Special Provision 02742S, diluted two parts concentrate to one part water by the manufacturer.

2.4 COVER MATERIAL

A. Use crusher processed virgin aggregate consisting of natural stone, gravel, or slag for standard chips or crusher-processed rotary-kiln lightweight expanded shale chips for lightweight chips meeting the requirements of Table 1.

Table 1

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Chip Seal Cover Material Properties

Test Test Method Standard Chip Seal Type I & II

Lightweight Chip Seal Type

I & II

*Unit Weight AASHTO T 19

100 lb/ft , max

60 lb/ft , max One Fractured Face

AASHTO T 335 95% minimum

Two Fractured Faces

AASHTO T 335 90% minimum

*LA wear AASHTO T 96 30% maximum 30% maximum Soundness AASHTO T 104 10% maximum 10% maximum Flakiness Index Materials MOI 8-933 17 maximum 25 maximum *Stripping Materials MOI 8-945 10% maximum 10% maximum *Polishing AASHTO T 278, T 279 31 minimum 31 minimum

* The Department has the right to waive this requirement if the aggregates have proven acceptable through successful past performance as determined by the Engineer.

B. Meet gradation limits in Table 2. Refer to AASHTO T 27 and T 11.

Table 2

2.5 BLOTTER MATERIAL

A. Refer to Section 02748.

2.6 EQUIPMENT

A. Use distributor trucks according to the following requirements:

1. Tachometer, pressure gauges, accurate volume measuring devices or a calibrated tank, and a thermometer for measuring temperatures of the tank contents.

2. Insulated tanks capable of storing the binder at temperatures that allow the binder to remain consistent with the appropriate viscosity for proper application rates.

a. Use tanks equipped with baffles to prevent pressure surges resulting from the asphalt sloshing in the tank when starting and stopping.

b. Use trucks equipped with devices to provide for accurate and rapid correlation and control of the amount of bituminous material being applied with that of the truck or distributor gauges.

3. Constant volume circulation pumps and heaters to maintain a pressurized system so binder will be uniformly heated.

a. Circulation pump must spray a constant volume for the entire length of the spray bar for each application.

4. Spray bar and nozzles designed to provide an appropriate fan width to provide uniform transverse distribution without corrugation or streaking.

a. Adjust the spray bar height to provide uniform distribution of binder across the application width and

Chip Seal Coat 02785S – Page 4 of 10

Gradation Limits

Sieve Size Percent Passing

Standard Aggregate Lightweight Aggregate Type I Type II Type I Type II

½ in 100 - 98 100 100 - 90 ⅜ in 100 69 - 91 80 - 100 55 - 80 No. 4 0 - 15 0 - 11 5 - 40 0 - 10 No. 8 0 - 6 0 - 20 0 - 3 No. 16 0 - 10 No. 200 0 - 1 0 - 1.5 0 - 2 triple lapping of the binder on the pavement surface.

b. Use a fully circulating spray bar with a positive shutoff valve.

5. Computerized rate control system allowing the operator to control all distributor operations from the cab to include:

a. Pressure regulation of the material application and automatic rate control adjustment to the unit ground speed.

1) Hydrostatic system capable of maintaining a tolerance of ± 0.03 gal/yd 2 .

b. Spray bar height and width adjustment and shut off of individual spray bar sections.

B. Use a self-propelled aggregate (chip) spreader specifically designed and manufactured for chip seal operations, equipped with the following:

1. Computerized controls that will apply a uniform, even layer of aggregate across the full width of the binder and adjust output to the unit ground speed.

a. Use gates adjustable to drop the correct amount of aggregate plus or minus 1 lb/yd 2 .

2. Variable width spreader with hydraulic control extension and adjustable discharge gates.

3. Spreading hopper with a minimum capacity to cover a full lane of travel plus 1 ft/pass.

4. Spinner broadcast type of aggregate spreader not allowed.

C. Use sufficient number of dump trucks to circumvent any interruption in the supply of chips to the spreader.

1. Use tandem axle dump trucks or larger or conveyor discharge trucks to minimize the number of hook-ups.

2. Use dump trucks with matching hitches and compatible with the aggregate spreader to provide smooth hook-ups and to minimize any spillage when loading the hopper.

3. Use trucks in good mechanical condition and that do not leak.

a. Use truck tires that do not pick up binder or aggregate when driving on the new surface.

D. Use at least three articulating type pneumatic rollers for rolling operations.

1. Use rollers weighing between 8 tons minimum and 12 tons maximum with a minimum width of 6 ft.

2. Use rollers with pneumatic tires of equal size diameter and having treads satisfactory to the Engineer.

3. Inflate tires so that the entire roller width area is compacted by either the rear-axle tires or the front-axle

02785S – Page 5 of 10 tires.

a. Inflate tires to 90 lb/in 2 , or lower as approved by the Engineer.

1) Maintain tire pressure within 5 lb/in 2 .

E. Sweeping Equipment

1. Use rotary brooms with nylon or steel bristles or pickup or vacuum brooms for pavement cleaning or brooming operations.

a. Keep downward pressure to a minimum.

b. Use water as requested by the Engineer if excessive dust is generated during sweeping operations.

c. Use pickup or vacuum sweepers in urban areas where aggregate accumulates in gutters or where removal is required from the edge of the shoulder.

d. Do not dislodge embedded aggregate when brooming chip sealed roadway.

F. Blotter Material Equipment

1. Apply blotter material using a truck mounted spinner broadcast spreader.

PART 3 EXECUTION

3.1 PREPARATION

A. Clean the road surface of all dirt, sand, dust, and other objectionable material to the satisfaction of the Engineer.

B. Protect all structures including but not limited to guardrail, guideposts, concrete barriers, all drains, and parapet walls.

C. Cover manholes, valve boxes, drop inlets, and other service utility entrances before placing any chip seal coat.

D. Stockpile blotter material at least 0.25 lb/yd 2 according to Section

02748 at a site within 20 minutes delivery time of each road section being chip sealed.

1. Have application equipment on site before beginning chip seal work.

a. Stockpiling of blotter material may be waived upon

Engineer approval if blotter material can be obtained and ready to spread within 20 minutes of a road section being chip sealed.

b. Equipment to spread blotter material is subject to inspection and approval by the Engineer.

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3.2 LIMITATIONS

A. Complete all work between May 15, and August 31.

B. Do not place chip seal coat if surface moisture is present.

C. Place seal coat when:

1. Pavement temperature is between 70 and 136 degrees F.

2. Air temperature is between 50 and 110 degrees F.

3. Forecasted temperature is not expected to be below 40 degrees F within 3 days after placement.

D. Do not apply any bituminous asphalt after 6:00 p.m. if temperatures in this Section, Article 3.2, paragraph C cannot be maintained throughout all night time hours.

E. Do not open to traffic the same day chip seal coat is placed on

Interstate routes.

1. Sweep and open to traffic no earlier than 6:00 a.m. the day following placement of cover material.

F. Allow at least 24 hours and a maximum of 4 days after completing application of cover material before applying bituminous flush coat material.

1. Apply bituminous flush coat material when the air temperature in the shade is 50 degrees F and rising and the pavement temperature is 70 degrees F and rising.

2. Do not apply bituminous flush coat material during fog, rain, or other adverse conditions.

3.3 COVER MATERIAL STOCKPILE

A. Construct on a clean base to minimize contamination.

B. Construct individual 500 ton stockpiles of aggregates.

Construct to facilitate uniform dampening. Avoid excess moisture.

1. Engineer authorizes stockpiles at least one and a maximum of seven days before use.

2. Combining, altering, or moving 500 ton stockpiles may require re- authorization by the Engineer before use.

C. Notify the Engineer at least seven calendar days before placement in order for the initial stockpiles to be sampled and tested for acceptance.

D. Obtain the Engineer’s authorization of a stockpile before use.

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E. Rework or remove material not meeting specifications from the stockpile area. Identify stockpiles that will be reworked.

F. The Engineer will retest corrected material for acceptance.

3.4 TEMPORARY PAVEMENT MARKINGS

A. Apply raised pavement markers according to Section 01558.

B. Apply temporary pavement marking paint according to Section

02765 as determined by the Engineer.

3.5 ASPHALT MATERIAL/COVER MATERIAL APPLICATION

A. Apply asphalt material at a rate sufficient to obtain 50 percent chip embedment before the rolling operation and 70 percent chip embedment after rolling operation.

1. Adjust application rates throughout the project depending on existing conditions.

B. Apply the asphalt emulsion at a minimum temperature of 145 degrees F.

C. Do not apply asphalt material if material does not spray through the distributor in a uniform way and remain in place on the roadway.

D. Place building paper adjacent to the transverse construction joint before starting each spraying operation.

1. Maintain the control valve to act instantaneously both at start-up and cut- off.

E. Locate longitudinal joints within 6 inches of the traffic lane line location.

1. Construct meet lines with no skip or voids between adjacent passes.

2. Do not place a double thickness of cover material.

F. Calibrate the spreader at the beginning of each day and as often as necessary to comply with Table 3.

1. Maintain a distance of less than 150 ft between the distributor and the chip spreader.

2. Maintain the chip spreader speed so that chips do not bounce or roll during application.

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Table 3

3.6 SURFACE ROLLING

A. Use at least three pneumatic-tire rollers in a longitudinal direction to roll surface after the cover material has been spread.

B. Roll at least three passes to seat the cover material.

1. A pass is defined as traveling in one direction only.

C. Control bleeding with blotter material and as determined by the Engineer.

D. Set the roller speed to prevent bouncing or skidding.

1. Do not exceed 5 mph.

2. Reduce roller speeds during directional changes to prevent surface tearing.

E. Synchronize the speed of the distributor and chip spreader with that of the rolling operation.

1. Begin initial rolling, consisting of one complete coverage, immediately behind the chip spreader.

2. Begin secondary rolling, consisting of second and third coverage, immediately after completing initial rolling.

3. Synchronize all operations to keep rolling operations within

Chip Seal Coat 02785S – Page 9 of 10

Approximate Spread Rates Unit Weight lbs/ft 3 Application Rate lbs/yd 2 Lightweight Type I Chip Seal 45 - 50 9.6

50 - 55 10.6 55 - 60 11.6

Lightweight Type II Chip Seal 45 - 50 11.8 50 - 55 13.1 55 - 60 14.3

Standard Chip Seal 60 - 65 17.0 65 - 70 18.4 70 - 75 19.8 75 - 80 20.7 80 - 85 22.1 85 - 90 23.5 90 - 95 24.9 95 - 100 25.8

2,500 feet of the ongoing chip seal application.

F. Sweep excess cover material off the roadway after the emulsion has set.

1. Remove excess cover material to the satisfaction of the

Engineer before opening the roadway to traffic.

G. Repair all damage to the seal coat before opening the roadway to traffic.

3.7 BITUMINOUS FLUSH COAT APPLICATION

A. Clean the surface of all dirt, sand, dust, loose chips, and other objectionable material to the satisfaction of the Engineer before applying bituminous flush coat.

B. Apply the bituminous flush coat at a rate of 0.11, ± 0.01 gal/yd 2 .

1. Keep traffic off the flushed surface until the bituminous material has set sufficiently to prevent tracking or pick-up.

3.8 TRAFFIC CONTROL

A. Refer to Section 01554.

3.9 PAVEMENT MARKING PAINT

A. Allow at least 24 hours and a maximum of 4 days after completing flush coat before applying permanent pavement markings. Refer to Section 02765.

END OF SECTION

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