Hot-in-place_Part_H-2022_-_final.pdf

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PART H

TECHNICAL PROVISIONS

This contract will consist of hot in-place asphalt recycling services as an onsite, in-place method to rehabilitate the surface layer of an existing asphalt roadway up to a depth of one-inch and placing a layer of new asphalt material on the rehabilitated surface. The new asphalt placed over the rejuvenated layer of existing asphalt shall be in compliance with the lines, grades, thickness, and typical cross-section, established by the County, and in compliance with the most current version of FDOT Standard Specifications for Roads and Bridge Construction, Sections 327, 330, 334, and 337.

The hot-in-place asphalt recycling process will be accomplished with a specially designed machine as a single pass operation of heating, scarifying, applying an asphalt rejuvenating agent (emulsifier), thoroughly re-mixing, reshaping the existing surface, and spreading the final asphalt overlay, all in one continuous pass to monolithically recombine the restored pavement with the asphalt material.

This required single pass method can be described as a six step process:

• Heating the existing pavement

• Scarifying the heated, softened pavement to a one-inch depth

• Applying a recycling agent to the scarified material to restore viscosity of the aged asphalt

• Mixing and laying the recycled material to form a leveling course

• Applying the hot asphalt mix while the temperature of the recycled mix is still 225° F (at least)

• Final compaction

The required single pass process ensures that a thermal, monolithic bond is achieved because the repaver both recycles and lays the final wearing surface simultaneously. This process minimizes traffic delays and offers improved conditions for motorists’ safety.

Work to be performed under this contract will include, but is not limited to, materials, labor, equipment, traffic control, placement of signs, temporary traffic stripes, construction and application procedures for the required hot in-place asphalt recycling process.

The recycling equipment for this work will be a self-contained, self-propelled, automated unit capable of heating, scarifying (or milling), adding an asphalt rejuvenating agent (emulsifier) at a uniform rate, mixing, redistributing and leveling the existing asphalt to the specified depth and placing a new asphalt overlay, all in a single pass. Additional pre-heaters may be needed and used to achieve the specified depth and temperature.

1. MATERIALS

A. Asphalt Rejuvenating Agent (Emulsifier) – The asphalt rejuvenating agent (emulsifier) used to rejuvenate the existing pavement will be approved by the

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County’s Manager or designee prior to use. A manufacturer’s certification must be submitted to the County’s Manager or designee for the rejuvenating agent.

Emulsifier shall be ECR-1 as per Ergon Asphalt & Emulsions, Inc., or similar, and meet the minimum requirements of FDOT specifications.

2. EQUIPMENT

The Contractor must supply a list of all equipment to be used in the performance of this contract. This list must be included in the bidder’s submittal.

The equipment to be used on the project will be in good operating condition in sufficient time before beginning operations to allow evaluation by the County’s Project Manager or designee. The County’s Project Manager or designee has the right to reject equipment deemed not suitable for the intended project. The County’s Project Manager or designee has the right to request additional information on the equipment listed in the bidder’s submittal.

The recycling equipment will be a self-contained, self-propelled, automated unit capable of heating, scarifying (or milling), adding an asphalt rejuvenating agent (emulsifier) at a uniform rate, mixing, redistributing and leveling the existing asphalt to the specified depth and placing a new asphalt overlay, all in a single pass. The machine shall also be capable of reworking the material around the manholes and other obstacles; shall have a means of automatically applying an asphalt recycling agent at a uniform rate, and shall be capable of applying a new hot mix asphalt layer over the hot, partially compacted recycled mixture.

In addition, the recycling equipment will meet the following requirements:

A. Heating Unit(s) – This unit(s) will be hooded to prevent damage to adjacent property, including trees and shrubs. It will be capable of heating the pavement surface to a suitable temperature (minimum of 225 degrees F, not to exceed 325 degrees F) to allow scarification to the required depth without breaking aggregate particles or charring the pavement surface.

B. Scarifying or Milling Units - The scarifiers or rotary milling units will be capable of penetrating the pavement surface to the directed depth in one pass. The established range of depth is estimated to be from three-fourths (3/4”) inch to one and one half (1½”) inches. Scarifiers or milling heads will be equipped with separate, automatic height adjustments and sensors, which allow clearance over manholes and other obstructions.

C. Asphalt Rejuvenating Agent (Emulsifier) Applicator – This system will automatically add asphalt rejuvenating agent (emulsifier) to the scarified material at a uniform rate as directed by the County’s Project Manager or designee (typically at a rate of 0.10 gallons per square yard). The application rate will be synchronized with the

H-3 machine’s forward speed to maintain a tolerance with five (5%) percent of the specified application rate.

D. Conveying System – This system will consist of a receiving hopper and conveying system capable of collecting and transporting the new hot mix material to the finishing unit without segregation of the new material for final screed.

E. Recycling Unit – This unit will mix, distribute and level the scarified and rejuvenated material over the width being processed to produce a uniform cross section of recycled material.

F. Finishing Unit – This unit will have automatic screed controls to produce a surface conforming to the requirements specified by the County’s Project Manager or designee. This unit will be capable of producing a uniform slope, grade and texture of mix being placed.

G. Rollers – Compaction equipment or rollers will be of sufficient type and size to compact both asphalt layers to the required density. A sufficient number of rollers will be used to keep the operation moving at a steady pace. On some projects, two (2) steel-wheeled rollers may be needed. Other projects may require one 1) steel-steeled roller and one (1) rubber tire roller to achieve compaction. The Contractor will coordinate with the County’s Project Manager or designee to determine the proper combination of rollers to achieve the best results. All rolling will be completed before the asphalt temperature drops below one hundred ninety (190° F) degrees Fahrenheit.

3. CONSTRUCTION METHODS

A. WEATHER LIMITATIONS – No work shall be performed until the air temperature on the job is fifty degrees (50° F) Fahrenheit and rising. No work shall be performed in the rain, or if there is a threat of rain.

B. Prior to the hot-in-place operation, the pavement surface will be cleaned of standing water, grass, vegetation, sand, dirt and other deleterious materials that would affect the quality of the recycled mix. The pavement surface shall be clean and dry prior to the hot-in-place application. Note: No separate charge shall be made for this requirement.

C. The Contractor will be responsible for protecting the area adjacent to the work from heat damage. The Contractor at his/her expense will correct any damages incurred during operations performed under this contract.

D. To provide a welded longitudinal joint, the standing edge of the adjoining asphalt pavement will be fully heated to a width of at least two (2”) inches beyond the width to be scarified and recycled.

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E. Immediately following heating, the pavement surface shall be scarified or milled to the specified depth. The scarified material must have a temperature between two hundred twenty five degrees (225°) Fahrenheit and two hundred sixty five degrees (265°F) Fahrenheit, unless otherwise directed by the County’s Project Manager or designee. The material must be mixed with the asphalt-rejuvenating agent (emulsifier) and leveled at this temperature.

F. The new hot mix will be layered over the recycled material by the following method:

The recycled material will be gathered by a leveling device and spread to a uniform depth over the width being processed. After it is in place, and while it still has a residual temperature of at least 190°F, a layer of new hot mix material will be placed over it. The application rate of the new material will be sufficient to provide the required pavement thickness.

G. Due to the varying properties of the existing asphalt pavement, the following adjustments may be made as directed by the County’s Project Manager or designee:

a. Depth of scarification will be three-fourth (3/4”) inch to one and one half (1½”) inches.

b. Application rate for the asphalt-rejuvenating agent (emulsifier), to maintain a uniform mixture.

c. Application rate for new hot mix, to be 1” to 1½”.

Note: All asphalt rejuvenating agent (emulsifier) tickets, shall be submitted daily to the County’s Project Manager or designee, with the daily Superintendant Worksheet. The asphalt-rejuvenating agent (emulsifier) shall be metered and paid for by the gallon used in-place.

4. ASPHALT OVERLAY

Roads under this contract shall be overlaid with a minimum of one and one-half (1½”) inch of new SP 12.5 asphalt or one (1”) inch of new SP 9.5 asphalt (final thickness after compaction) during the recycling process, as specified by the County. The County’s Representative will make the determination on the final thickness to be used per project.

Specified thickness is across the new pavement mat and no under tolerances (i.e. FDOT tolerances) apply to this contract. No additional compensation will be provided to the contractor for excess material used to achieve minimum required thickness.

Where required, friction course shall be installed with a minimum of one and one-quarter

(1.25”) inch of SP FC 9.5 overlay (final thickness after compaction).

All mix designs shall be FDOT approved. The Type SP 12.5, SP 9.5 and SP FC 9.5 asphalt mixes shall be Traffic Level C with no more than 30% RAP content. Asphalt rubber binders shall not be used.

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A certified asphalt mix design must be provided to the County prior to starting operations on this contract. The contractor will be responsible to demonstrate via lab tests, density tests and coring, as required by the County’s Representative. The Contractor will also be responsible to demonstrate that all work has been completed as specified herein and in compliance with all applicable FDOT standards.

The contractor shall provide copy of all asphalt tickets used on any particular area to the County’s Representative on a daily basis along with the Contractor’s Daily Superintendent Worksheet (provided by the County). The daily average yield per street shall be specified on the daily worksheet. Asphalt tickets shall specify the name of the street the asphalt was used on. The County may require additional documentation to be specified.

Areas determined not to be in compliance with contract specifications and requirements shall be removed and replaced by the Contractor at no additional cost to the County.

5. MILLING

When milling to improve rideability or cross slope, remove the existing pavement to the average depth specified, in a manner that will restore the pavement surface to a uniform cross-section and longitudinal profile. County’s Representative may require the use of a string line to ensure maintaining the proper alignment.

Establish the longitudinal profile of the milled surface in accordance with the specifications. Ensure that the final cross slope of the milled surface parallels the surface cross slope shown on the plans, if provided, or as directed by the County’s Representative. Establish the cross slope of the milled surface by a second sensing device near the outside edge of the cut or by an automatic cross slope control mechanism. If provided, the plans may wave the requirement of automatic grade or cross slope controls where the situation warrants such action.

Multiple cuts may be made to achieve the required pavement configuration or depth of cut. Include in the Quality Control Plan a system to control the cross slope of the milling surface with a minimum frequency of one cross slope measurement every 250 feet (75 m) during milling operations in order to ensure that the slopes are uniform and in compliance with the designed milling slope.

When the difference between the measured cross slope and the designed cross slope exceeds + or – 0.2% for travel lanes (including turn lanes) and = or – 0.5% for shoulders, make all corrections immediately to bring the cross slope into an acceptable range. The County’s Representative may periodically verify the Contractor’s measurements at the job site. During the milling operations, the County’s Representative reserves the right to take ten cross slope measurements per day. If the average cross slope of the ten measurements varies more than the permissible tolerance, the milling operations will be stopped until appropriate corrective actions are made to bring the cross slope into an

H-6 acceptable range and the deficient sections shall be corrected accordingly. A detailed correction plan shall be immediately submitted to the County for review. The County’s Representative may wave the corrections specified above if an engineering determination indicates that the deficiencies are sufficiently separated so as not to significantly affect the final cross slope. The Contractor will be responsible at his/her cost to provide supporting engineering data for review.

As long as the milled area is not more than 1.5”, the contractor can mill no more than 24 hours ahead. However, the contractor will be responsible to correct damages to any exposed base due to weather conditions and temporary striping must be in place to protect traffic overnight. If the milled surface exceeds the 1.5” threshold, the contractor must perform a mill and a fill operation. The contractor is responsible for dust control at all the times regardless of methodology.

The milling machine shall be capable of maintaining a depth of cut and cross slope that achieves the results specified in the plans and specifications. The overall length of the machine (out to out measurements excluding the conveyor) shall be a minimum of 18 feet. The minimum cutting width shall be 6 feet.

The milling machine shall be equipped with a built-in automatic grade control system that controls the transverse slope and the longitudinal profile to produce the specified results.

Any commercially manufactured milling machine meeting the above requirements shall be accepted prior to starting the project. If after milling has started, the milling machine cannot consistently produce the specified results, the milling machine will be rejected for further use.

The use of a smaller milling machine could be permitted when milling adjacent to existing curbs or other areas where it is impractical to use the above-described equipment. The equipment will be subject to the County’s Representative’s acceptance.

Milling equipment shall be equipped with means to effectively limit the amount of dust escaping the removal operation and shall be operated to minimize the amount of dust being emitted from the machine. Pre-wetting of the pavement may be required.

Where traffic will be maintained on the milled surface prior to placing the new asphaltic concrete, the striation patterns shall produce an acceptable riding surface. The County’s Representative will accept the traveling speed of the milling machine to produce an acceptable riding surface.

Before opening a milled area to traffic, the pavement shall be thoroughly swept with power broom or other acceptable equipment to remove, to the greatest extent practicable, fine material, which will dust under traffic. This operation shall be conducted in such a manner that will minimize the potential of creating a traffic hazard and minimize air pollution.

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Sweeping the milled surface with a power broom is required before asphalt recycling and immediately after the milling to prevent milled material infiltrating into the storm sewer system when the milling operation is near a municipal curb and gutter or a closed drainage system.

The sweeping operation shall include thoroughly removing all milled material from the gutter to prevent it from being swept into inlet openings or grates. Curbs shall not be damaged during the removal operation; any damages shall be immediately repaired at no additional cost to the County. The County’s Representative may require the equipment and/or methods be changed to achieve satisfactory results.

Milled surfaces shall have a reasonably uniform texture, shall be within ¼ inch of a true profile grade and shall have no deviation in excess of ¼ inch from a straightedge applied to the pavement perpendicular to the centerline. Variations of the longitudinal joint between multiple cut areas shall not exceed ¼ inch. Areas varying from a true surface in excess of the above stated tolerance may be accepted without correction if the County’s Representative determines that they were caused by a pre-existing condition, which could not have reasonably been corrected by the milling operations. The County’s Representative may require re-milling of any area where a surface lamination causes a non-uniform texture to occur. Any unsuitable texture or profile, as determined by the County’s Representative, shall be corrected by the Contractor at no additional compensation.

The Contractor shall not change or modify existing drainage configuration of roads to be paved under this contract. The Contractor will be responsible to restore any modified drainage/road profile to original condition at no additional cost to the County.

Milled material becomes the property of the Contractor. Include the cost of removing any existing pavement markers in the unit price for milling.

The unit price for milling shall be inclusive of all supervision, quality control, labor, materials, equipment, tools, transportation, supplies, manpower, incidentals and pay disposal fees necessary to complete the work as specified.

• Curb-Reveal Milling – Per request, some areas require curb- reveal milling before paving. Curb-reveal milling will normally be accomplished by milling one

(1) pass with a 6-feet milling machine to a depth of 1½ inches below the curb line and tapering to 0-inch at the inside of the cut.

• Complete Roadway Mill – Per request, remove existing asphalt concrete pavement by milling to improve the rideability and cross slope of the finished pavement, to lower the finished grade adjacent to existing curb prior to resurfacing, or to completely remove existing pavement, when milling to improve rideability, average depth of cut will be specified.

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All milling operations shall conform to the requirements under FDOT Standard Specifications for Road and Bridge Construction, Section 327.

6. BASE REPAIRS

The base upon resurfacing is to be made may be found to be unstable. The Contractor shall immediately notify the County’s Representative of the possible base failure. The County’s Representative will visit the site and will determine if the repairs are warranted.

Should the area in question need improvement, the Contractor and the County’s Representative will determine the extent to which the base is to be removed (area).

The existing road base shall be removed to a depth of four inches (4”) below the existing finished asphalt grade and replaced with specified compacted asphalt (two – 2-inch layers). The Contractor shall always take into consideration the proposed finished grade for the area as specified on the Delivery Order for the project. The unit cost for base repair shall include all supervision, quality control, labor, materials, equipment, tools, transportation, supplies, manpower, and pay disposal fees necessary to complete the work as specified.

7. CORING AND TESTING

Core samples shall be taken every 500 feet staggered across the new pavement mat (minimum requirement). Coring analysis shall include total thickness, layer thickness, condition of asphalt, gradation and binder content, viscosity and penetration of existing asphalt, and presence of paving fabric. The cost for coring, lab and density tests, and straight-edge test (as required by the County’s Representative) shall be included on the unit price for asphalt recycling and shall be inclusive all supervision, quality control, labor, materials, equipment, tools, transportation, supplies, manpower, clean up, tests, incidentals, disposal fees, etc. necessary to complete the work as specified herein.

8. MANHOLES AND VALVES

Existing manholes, valves or other structures located in the roadway must be adjusted by the Contractor to finish asphalt grade immediately before the resurfacing takes place.

The use of manhole risers and valve risers will be accepted. The price of such items will be a separate pay item.

9. CLEAN UP

The Contractor shall keep the work site free from accumulations of waste materials, rubbish and debris from and about the work site. All tools, construction equipment and machinery, and surplus materials shall be kept under control, and shall leave the site clean and ready for occupancy by the County. The Contractor shall restore to their original condition those portions of the work site, such as staging and stockpile areas, not

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Inlet openings shall be kept free from debris generated during milling and resurfacing operations to prevent excessive accumulations and possible flooding in the affected areas during heavy cycles of rain. Millings will not be blown into drains or storm drain inlets at any time. Failure to adhere to this will result in a request to jet out affected pipes and drains at the contractor’s expense or reimbursing the County for the clean-up effort carried out by County personnel.

10. TEMPORARY PAVEMENT MARKINGS

The contractor shall be responsible for all temporary pavement markings required on areas where the work is to be accomplished as needed. Pavement markings shall be restored in the same fashion that they were before the project began, unless otherwise specified by current guidelines for placement of markings or as authorized by the County’s Representative.

The County will only allow the use of paint as temporary markings. All markings shall be in place before the end of the workday and shall be placed according to the Florida Department of Transportation Standard Specifications for Road and Bridge Construction, latest edition. Temporary striping shall be in place to protect traffic overnight. Payment for temporary paint pavement markings will be made by linear foot for yellow and white lines; messages and arrows will be paid as each.

11. MEASUREMENTS AND PAYMENT

• Hot In-Place Asphalt Recycling (Square Yard) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary for Hot In-Place Recycling as specified.

• Emulsifier (Gallon) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish and inject emulsion on recycled base material as specified.

• Milling 1”- 3” (Square Yard) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to mill existing asphalt pavement prior to resurfacing, separate from the hot-in-place milling.

• Curb Reveal Milling of Existing Asphalt (Square Yard) – (based on the width of the mill no less than 6’)- Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to curb reveal mill existing asphalt pavement, as specified, prior to resurfacing.

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• Asphalt (Type SP 12.5 in place @ 1.5”) (Square Yard) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish and install 1.5” of asphalt Type SP 12.5.

• Asphalt (Type SP FC 9.5 @ 1.25”) (Square Yard) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish and install 1.25” of asphalt Type SP FC 9.5

• Asphalt (Type SP 9.5 @ 1”) (Square Yard) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish and install 1” of asphalt Type SP 9.5

• Base Repairs 4”, with SP 12.5 asphalt (Square Yard) - The unit price for base repair shall be inclusive of all labor, materials, equipment, installation and incidentals required to provide services as specified. The cost shall also be inclusive of proper disposal of removed material.

• Raise Manhole Covers (Each) - The unit price for raising manhole covers to match grade shall include all labor, materials, equipment, installation, maintenance of traffic and incidentals associated to complete this task.

• Raise Water Valve Covers (Each) - The unit price for raising water valve covers to match grade shall include all labor, materials, equipment, installation, maintenance of traffic and incidentals associated to complete this task.

• Installation of County Provided Manhole Risers (Each) - The unit price for raising manhole covers to match grade shall include all labor, equipment, installation, maintenance of traffic and incidentals associated to complete this task.

• Installation of County Provided Water Valve Risers (Each) - The unit price for raising water valve covers to match grade shall include all labor, equipment, installation, maintenance of traffic and incidentals associated to complete this task.

• Temporary Paint Pavement Markings 6” (Linear Foot) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish and install 6” temporary paint pavement markings.

o Note: For temporary stop bars, the temporary paint pavement markings will be paid as 6-inch lines multiplied by the amount of lines needed to complete it (i.i. 6” line x 4 lines = 24” stop bar).

• Temporary Paint Pavement Markings, Messages and Arrows (Each) - Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish and install temporary paint pavement markings messages and arrows.

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• Law Enforcement for Special MOT Operations (Hour) - Law enforcement officials shall be present during night time work and any time when controlling traffic at signalized intersections. All materials, labor and equipment necessary for these operations or as may be directed by the County’s Representative shall be included as part of this unit price.

Note: Hours for Law Enforcement will be paid as hours on site for the required traffic control during night time work and any time when controlling traffic at signalized intersections. Unless requested by the County, any other daytime hours for Law Enforcement will be the contractor's responsibility, since in general it is each contractor's responsibility to maintain a safe work zone in their projects.

• Message Boards (Week) –Message boards shall be in place ten (10) days prior to commencement of any work in all major roadways and industrial park. Payment for this item shall be full compensation for all labor, materials, equipment and incidentals necessary to furnish, place and remove message boards as required on each project, or as may be directed by the County’s Representative.

12. FINAL INSPECTION

Upon written notice from the Contractor that the project is complete, The County’s Project Manager or designee will make a final inspection with the Contractor and will notify the Contractor in writing of any deficiencies in the project. The Contractor will correct all deficiencies within seven (7) workdays or as agreed to by the County’s Project Manager or designee and before final acceptance and payment is made. If a second inspection is required, the County will assess an eighty ($80.00) dollar fee to the Contractor. The eighty ($80.00) dollar fee will be assessed for every re-inspection after the first inspection. The fee is assessed to offset the additional County labor costs and vehicle usage required for unnecessary inspections and the fee will be deducted from the final invoice for that Delivery Order.

13. FINAL INSPECTION FOR PAYMENT

After the Contractor has corrected all deficiencies to the satisfaction of the County’s Project Manager or designee, the Contractor shall submit a final invoice for services provided.

The Contractor will be required to submit with the final invoice for each project:

asphalt tickets, cores, effective final release or waivers of lien from the Contractor and all sub-contractors which performed services for the Contractor pursuant to the contract documents, and any other required document as specified in herein.

The Contractor is required to submit this information and the final invoice no later than two weeks (14 calendar days) after final inspection and acceptance has been

H-12 made. Failure to comply with proper invoicing requirements may result in termination of this contract.

14. PERFORMANCE ISSUES

The County will hold the Contractor responsible for meeting all the Contractor’s contractual obligations. If performance issues arise, the County will schedule a meeting to review the contractual deficiencies and the Contractor will be responsible for providing a written corrective action plan within two (2) working days from the meeting. Failure to provide a satisfactory corrective action plan, or failure to follow through on an approved plan, will result in issuance of a Notice to Cure.