32 22 16 - Revised per Amendment 0001.pdf

Resident Engineer Office Building Dam Safety Modification Project, East Branch Lake

SECTION TABLE OF CONTENTS

DIVISION 32 - EXTERIOR IMPROVEMENTS

SECTION 32 22 16

BITUMINOUS PAVEMENT CONSTRUCTION

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 SUBMITTALS

1.4 WAYBILLS AND DELIVERY TICKETS

1.5 WEATHER LIMITATIONS

1.6 EQUIPMENT

1.7 APPLICABLE PROVISIONS

PART 2 PRODUCTS

2.1 BITUMINOUS MATERIALS

2.1.1 Bituminous Hot Mix

2.1.1.1 Bituminous Binder Course

2.1.1.2 Bituminous Wearing Course

2.1.2 Bituminous Tack Coat

2.1.3 Bituminous Prime Coat

PART 3 EXECUTION

3.1 GENERAL REQUIREMENTS

3.2 TACK COAT

3.2.1 Preparation of Existing Pavement

3.2.2 Application Rate

3.2.3 Application

3.3 BITUMINOUS HOT MIX

3.3.1 Placing

3.3.2 New Paving - Existing Paving Interface

3.3.3 New Paving - Structures Interface

3.3.4 Cold Joints

3.3.5 Testing of Pavements - In Progress Work

3.3.6 Acceptability of Work

3.3.6.1 Grade Control

3.3.6.2 Plan Grade

3.3.6.3 Surface Smoothness

3.3.6.4 Thickness Control

3.4 GRADE AND SURFACE-SMOOTHNESS REQUIREMENTS OF BITUMINOUS SURFACES

3.5 MAINTENANCE

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SECTION 32 22 16 Page 1

W911WN-12-R-0001 REVISED BY AMENDMENT 0001

SECTION 32 22 16

BITUMINOUS PAVEMENT CONSTRUCTION

PART 1 GENERAL

1.1 SUMMARY

This section addresses the requirements for bituminous pavement.

construction under this contract.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

PENNSYLVANIA DEPARTMENT OF TRANSPORTATION (PDT)

PDT 408 (2011) Specifications

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES :

SD-06 Test Reports

Surface Smoothness; G, RE

Finished surfaces of bituminous courses, when tested as specified, shall conform to the grade lines and elevations shown and to the surface smoothness requirements specified.

SD-07 Certificates

Bituminous Materials; G, RE Bituminous Hot Mix; G, RE

Bituminous Wearing Course; G, RE Bituminous Tack Coat; G, RE Bituminous Prime Coat; G, RE

Certificates from the manufacturers attesting that bituminous materials meet specification requirements shall be submitted.

Certificates are required for all bituminous material.

SD-11 Closeout Submittals

Waybills and Delivery Tickets

Certified copies of waybills and delivery tickets for all

SECTION 32 22 16 Page 2 materials actually used shall be submitted during the progress of the work.

1.4 WAYBILLS AND DELIVERY TICKETS

Copies of waybills or delivery tickets shall be submitted during the progress of the work.

1.5 WEATHER LIMITATIONS

The prime coat shall be applied only when the underlying surface is dry enough to promote uniform coverage and the desired penetration into the treated surface. The prime coat shall be applied only when the atmospheric temperature in the shade is 50 degrees F or above and when the temperature has not been below 35 degrees F for the 12 hours prior to the application.

Unless otherwise directed, bituminous courses shall not be constructed when temperature of the surface of pavement or aggregate base course is below 40 degrees F.

1.6 EQUIPMENT

All plant, equipment and tools used in the work shall be subject to approval before the work is started and shall be maintained in satisfactory working condition at all times. The equipment shall be adequate and have the capability of meeting grade controls, thickness control, and smoothness requirements specified herein. The bituminous plant shall be of such capacity to produce the quantities of bituminous mixtures required.

Hauling equipment, paving machines, rollers, miscellaneous equipment, and tools shall be provided in sufficient numbers and capacity and in proper working condition to place the bituminous paving mixtures at a rate which will support the requirements governed by the project. The mixing plant shall be an automatic or semi-automatic controlled commercially manufactured unit designed and operated to consistently produce a mixture within the material requirements specified herein. The plant shall have a minimum production capacity (tons per hour) which will support the requirements governed by the project. Bitumen distributor shall be equipped with flow controls and metering gauges to regulate and monitor application rate of prime and tack coat material. The distributor shall be designed and equipped to spray the bituminous material in a uniform coverage at the specified temperature, at readily determined and controlled rates with an allowable variation from the specified rate of not more than plus or minus 5 percent, and at variable widths.

1.7 APPLICABLE PROVISIONS

It is the intent of these specifications that the work shall be constructed in accordance with the applicable provisions of PDT 408. The state highway specifications are incorporated into these specifications to the extent indicated by the references thereto. If any conflict exists between the state highway specifications and these specifications, these specifications shall govern. The term "Department" as used in the state highway specifications shall be interpreted to mean "Government". The term "Engineer" as used in the state highway specifications shall be interpreted to mean "Contracting Officer" as defined in the CONTRACT CLAUSE entitled "Definitions". Measurement and payment shall be as specified herein.

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PART 2 PRODUCTS

2.1 BITUMINOUS MATERIALS

2.1.1 Bituminous Hot Mix

Asphalt concrete shall consist of coarse aggregate, fine aggregate, mineral filler, bituminous material, and approved additives, if required, of the qualities and in the proportions specified by the requirements of PDT 408 as given herein. Binder and wearing courses shall be placed to the final compacted thicknesses as indicated on the drawings, and rolled for drainage as shown on the drawings.

2.1.1.1 Bituminous Binder Course

PDT 408, Section 421 virgin mix, with 5 to 10 percent RAP.

2.1.1.2 Bituminous Wearing Course

PDT 408, Section 420 with bitumen content of the mix shall be no less than 6 percent and no more than 12 percent, and Skid Resistance Level (SRL) shall be "L".

2.1.2 Bituminous Tack Coat

Bituminous tack coat shall conform to PDT 408, Section 460, with the exception that the application rate shall be not less than 0.05 gallons per square yard of surface area, and no dry fine aggregate to blot excess prime coat will be necessary. Application rate may be varied to suit actual field conditions as directed by the Contracting Officer.

2.1.3 Bituminous Prime Coat

Bituminous prime coat shall conform to PDT 408, Section 461, with the exception that the application rate shall be not less than 0.45 gallons per square yard of surface area, and no dry fine aggregate to blot excess prime coat will be necessary. Application rate may be varied to suit actual field conditions as directed by the Contracting Officer.

PART 3 EXECUTION

3.1 GENERAL REQUIREMENTS

Construction requirements for items of work specified in PDT 408 shall conform to the applicable requirements of PDT 408 as modified herein.

3.2 TACK COAT

3.2.1 Preparation of Existing Pavement

A bituminous tack coat shall be applied between the bituminous binder course and the bituminous wearing course. Immediately before applying the tack coat, all loose material, dirt, clay, or other objectionable material shall be removed from the surface to be treated. To assure a uniform spread of the bituminous material, the portion of the existing pavement prepared for treatment, if excessively dry, shall be lightly sprinkled with water immediately before the application, as directed.

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3.2.2 Application Rate

Bituminous material for the tack coat shall be applied in quantities of not less than 0.05 gallons per square yard of pavement surface. The exact quantities, which may be varied to suit actual field conditions, will be determined by the Contracting Officer.

3.2.3 Application

Following preparation and subsequent inspection of the surface, the tack coat shall be applied at the specified rate with uniform distribution over the surface to be treated. All areas and spots missed by the distributor shall be properly treated with the hand spray. Following application of bituminous material, the surfaces shall be allowed to cure without being disturbed. Until the succeeding layer of pavement is placed, the treated surfaces shall be maintained by protecting them against damage and by repairing and retreating deficient areas at no additional cost to the Government. No smoking, fires, or flames other than the heaters that are a part of the equipment shall be permitted within 25-feet of heating, distribution, and transferring operations of bituminous material other than bituminous emulsions.

3.3 BITUMINOUS HOT MIX

3.3.1 Placing

Bituminous courses shall be constructed only when the aggregate base course and existing pavement at interface areas have no free water on the surface.

The existing aggregate base course (constructed by others) will be used as a travel and laydown surface until the parking area is paved. The aggregate base course shall be graded and rerolled and be in satisfactory condition prior to placement of new pavement. Bituminous mixtures shall not be placed without ample time to complete spreading and compaction during daylight hours. Compaction and rolling equipment shall follow as closely behind the paving machine as possible. Areas inaccessible to rollers shall be compacted by mechanical vibratory tampers. Compaction shall continue until no marks or tracks are left from the compaction or rolling equipment. Bituminous binder and wearing courses shall be placed in accordance with the applicable requirements of PDT 408. Bituminous binder courses shall be constructed in compacted lifts no greater than 23-inches.

Wearing courses shall be constructed in one compacted lift equal to the full design thickness, as indicated. A bituminous prime coat shall be applied between the aggregate base and the bituminous binder course.

3.3.2 New Paving - Existing Paving Interface

Where new bituminous pavement meets the existing pavement, a straight, smooth butt joint shall be constructed as shown. Joints indicated to be vertically sawcut into the existing pavement shall be sawcut to the full depth for the entire length of the pavement interface. The surfaces of the existing pavement at the interface shall be cleaned of all loose material and dirt and painted with a suitable bituminous joint sealant material conforming to ASTM D 3381, AC-20. The feathering of new pavement over existing pavement at interfaces will not be permitted. Joints between old and new pavement shall be made in accordance with the applicable requirements of PDT 408 and the drawings to insure continuous bond between the old and new sections. All joints shall have the same texture and smoothness as other sections of the course. After completion of the new bituminous pavement, a hot-applied bituminous sealant, conforming to

SECTION 32 22 16 Page 5

ASTM D 3381, AC-20, shall be applied along each joint between the new and existing pavement sections for a minimum width of six inches on each side of the joint.

3.3.3 New Paving - Structures Interface

Where new bituminous pavement meets curbs, sidewalks, manholes, inlets and other structures, all surfaces at the interface shall be cleaned of all loose material and dirt and painted with a suitable bituminous joint sealant material conforming to ASTM D 3381, AC-20. Joints at these interfaces shall be compacted to provide the same density, texture and smoothness as other sections of the course. Vibratory hand tampers shall be utilized for compaction, where rolling is not practicable. After completion of the new bituminous pavement, a bituminous hot-applied sealant, conforming to ASTM D 3381, AC-20, shall be applied along each joint interface for a minimum width of six inches.

3.3.4 Cold Joints

Joints between between successive work days, or joints that have become cold (less than 175 degrees F) shall be made in accordance with the applicable requirements of PDT 408 to insure continuous bond between the old and new sections. The feathering of new pavement over existing pavement at joints will not be permitted. All joints shall be compacted to provide the same density, texture and smoothness as other sections of the course. After completion of the new bituminous pavement, a suitable hot-applied bituminous sealant, conforming to ASTM D 3381, AC-20, shall be applied along each joint interface for a minimum width of six inches on each side of the joint.

3.3.5 Testing of Pavements - In Progress Work

The contracting Officer reserves the right to sample and test any area which appears to deviate from the specification requirements, during the progress of work. Testing in these areas will be in addition to any further testing subject to the conditions of paragraph ACCEPTABILITY OF WORK. Samples shall be tested and evaluated for conformance with all specified requirements. Test results indicating that the pavement does not conform to specification requirements shall be considered cause for corrective actions.

3.3.6 Acceptability of Work

The Contractor shall conduct all initial acceptance tests. Additional tests required to determine acceptability of nonconforming material will be performed as specified herein.

3.3.6.1 Grade Control

Lines and grades shall be established and maintained by means of line and grade stakes placed at the site of the work. Elevations of bench marks used by the Contractor for controlling pavement operations at the site of the work shall be determined, established, and maintained by the Contractor.

Finished pavement elevations shall not vary by more than 0.05 foot from those elevations shown on the plans or from the established datum. The Contractor shall maintain tight control of the finished elevations to facilitate proper drainage of the site.

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3.3.6.2 Plan Grade

Grade conformance tests shall be conducted by the Contractor. The finished surface of the pavement shall be tested for conformance with plan-grade requirements. Within 5 working days after completion of placement of a particular lot, the Contractor shall inform the Contracting Officer in writing of results of grade conformance tests. The finished grade of each pavement area shall be determined by running lines of levels at intervals of 25-feet or less longitudinally and transversely to determine the elevation of the completed placement. In areas where the grade exceeds the plan grade tolerances shown on the drawings by more than 50 percent, the Contractor shall remove the deficient area and replace with fresh paving mixture at no additional cost to the Government. Sufficient material shall be removed to allow at least 1-inch of asphalt concrete to be placed. Skin patching for correcting low areas or planing for correcting high areas will not be permitted. The grade of the completed bituminous surface shall not deviate more than 0.05 foot from the plan grade.

3.3.6.3 Surface Smoothness

After completion of final rolling of a lot, the compacted surface shall be tested by the Contractor with a 12-foot straightedge. Measurements shall be made perpendicular to and across all mats at distances along the mat not to exceed 25-feet. Location and deviation from straightedge of all measurements shall be recorded. When more than 5 percent of all measurements along the pavement areas exceeds the tolerances indicated, the Contractor shall remove the deficient areas and replace them with fresh paving mixture at no additional cost to the Government. Sufficient material shall be removed to allow at least 1-inch of asphalt concrete to be place. Skin patching for correcting low areas or planing for correcting high areas shall not be permitted. When a 12-foot straightedge is laid on the bituminous surface parallel with the centerline of the paved area or transverse from crown to pavement edge, the surface shall vary not more than 1/4-inch from the straightedge.

3.3.6.4 Thickness Control

As each bituminous course is placed, the Contractor shall monitor the thickness of the bituminous binder and wearing courses to verify conformance with the design thicknesses indicated on the contract drawings. The thickness of the bituminous binder and wearing course shall be measured at intervals of no less than 25 linear feet along the centerline of the roadway, unless otherwise directed. The thickness shall be measured by use of grade stakes, string lines, or other methods approved by the Contracting Officer. All stakes, lines, or other devices to be used or these measurements shall be furnished and installed by the Contractor.

The Contractor shall record the measurements and submit the results no later than 24 hours (1 day) following the completion of the test. The total measured thickness of the bituminous binder and wearing courses combined shall be within +/- 1/4-inch of their total combined design thickness. Where measured thickness indicate that the pavement thickness (binder and wearing courses combined) is more than 1/4-in deficient, additional measurements shall be taken, as directed by the Contracting Officer, until the total deficient area of paving is determined. Such areas shall be corrected by removing both courses to their full thickness and placing and compacting additional new bituminous paving materials to the proper design thicknesses. Edges of the areas removed shall be treated as specified above in paragraph NEW PAVING - EXISTING PAVING INTERFACE.

Fresh paving mixture shall be placed in the excavated areas in sufficient

SECTION 32 22 16 Page 7 quantity so that the finished surface will conform to grade and smoothness requirements. Paving mixture shall be compacted to the density specified herein. Skin patching of any deficient areas shall not be permitted. The costs of placing the new bituminous paving to correct the deficient areas, and also the additional testing, shall be borne by the Contractor. Where the measured thickness of the bituminous pavement is more than that indicated, the pavement will be considered as conforming with the requirements, up to a maximum of 1/4-inch excess. Bituminous pavement placed thicker than the allowable 1/4-inch excess shall be promptly corrected, as directed by the Contracting Officer. No additional payment will be made for excessively paved areas.

3.4 GRADE AND SURFACE-SMOOTHNESS REQUIREMENTS OF BITUMINOUS SURFACES

Finished surface of bituminous courses, when tested as specified herein and in paragraph ACCEPTABILITY OF WORK, shall conform to grade line and elevations shown and to surface-smoothness requirements specified.

3.5 MAINTENANCE

The completed bituminous pavement shall be maintained in a condition that will meet all specification requirements until accepted. The Contractor shall prevent any of his equipment from tracking over the completed bituminous pavement which would cause ruts, soft spots, or damage the pavement in any other way. Any damage to the bituminous pavement caused by the Contractor's negligence shall be corrected to the satisfaction of the Contracting Officer at no additional cost to the Government. After final rolling, no vehicular traffic of any kind shall be permitted on the pavement until the pavement has cooled to 140 degrees F., and in no case before six hours after being placed. Traffic shall be allowed on the bituminous binder course after the freshly placed pavement has been allowed to cool properly. However, the Contractor shall maintain the completed bituminous binder course until the placement of the bituminous wearing course. Any defects which may develop in the construction of the bituminous binder course or any damage caused by the operation of traffic is the responsibility of the Contractor and shall be immediately repaired or replaced at no additional cost to the Government.

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