36C78619R0049-007.pdf

01-25-19

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SECTION 32 12 18

MILLING & PAVING

PART 1 - GENERAL

1.1 DESCRIPTION

A. Project work to generally consist of Milling and Hot Mixed Asphalt (HMA) paving to several smaller roadways drives and loops within the Riverside

National Cemetery. Specific Project Areas and additional Notes have been clearly shown on the Contract “Drawings”.

B. Perform the work covered by this section including, but not limited to, milling the Asphalt pavement at locations, depths, widths and typical sections indicated in the Contract Documents; cleaning the milled surface;

loading, and stockpiling the milled material on-site.

C. The work shall cover the preparation and placement of Hot Mixed Asphalt

(HMA)pavement. The HMA shall consist of an asphalt surface course constructed in conformity with the lines, grades, thickness, and cross sections as shown on the Drawings or as outlined in the Statement of Work.

D. The Contractor shall furnish all materials, equipment, submittals, third party testing, reports, labor and supervision necessary for the “FY19

Roadway Improvements” project.

E. The work includes “Full Depth Pavement Repair” on portions of the roadway

Drives and Loops and “Miscellaneous Areas for Full Depth Pavement Repair”.

The approximate quantities and areas are included in the “Detailed Scope of Work”, with known locations shown on the Drawings, and unknown locations as directed by the Project Manager (PM) or Contracting Officer

Representative (COR).

F. The work also includes incidental items such as stormwater inlet cleaning, lowering of the curb in front of stormwater inlets, installation of additional concrete curb, inspections, testing, submittals, and other incidentals noted on Drawings and Contract Documents.

G. Phasing: The work will be completed, one Project Area at a time. Work shall not proceed to the subsequent Project Area until the current roadway repair / rehab has been complete, inspected and accepted by the

Contracting Officer Representative (COR). Submit phasing plan to the

Project Manager and COR for approval prior to beginning any work.

1.2 DEFINITIONS

A. Unclassified Excavation: Unclassified excavation shall consist of the excavation and disposal of all materials, of any description, encountered during construction, unless otherwise specified in the contract.

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B. Subgrade Surface: The subgrade surface is the surface of the road section upon which the select materials and/or subbase are placed.

C. Suitable Material: A material whose composition is satisfactory for use in embankment construction is a suitable material. The moisture content of the material has no bearing upon such designation. In general, any mineral (inorganic) soil, blasted or broken rock and similar materials of natural or man-made (i.e. recycled) origin, including mixtures thereof, are considered suitable materials.

D. Unsuitable Material: Any material containing vegetable or organic matter, such as muck, peat, organic silt, topsoil or sod, or other material that is not satisfactory for use as a Subgrade material is designated as an unsuitable material. All man-made deposits of industrial waste, toxic or contaminated materials, sludge, landfill or other material is unsuitable.

All excavated unsuitable materials shall be the Contractor's property for disposal as surplus materials.

E. Proof Rolling: Proof rolling consists of applying test loads over the subgrade surface by means of a heavy pneumatic-tired roller of specified design, to locate and permit timely correction of deficiencies likely to adversely affect performance of the pavement structure.

1.3 ALIGNMENT AND GRADE CONTROL

A. The Contractor’s Registered Professional Land Surveyor shall establish and control the Milling and Paving work location, quantities, alignments, grades, elevations, and cross sections required to conduct the work.

1.4 SUBMITTALS

A. In accordance with Section 39 – “Asphalt Concrete” of the (Caltrans)

Standard Specifications, latest edition.

B. Contractor shall make all Submittals to the Project Manager directly and in accordance with the Caltrans “Standard Specifications” unless noted otherwise in the Technical Specification SECTION 32 12 18 MILLING &

PAVING. Substitutions or approved equals will be considered if submitted to the Project Manager in writing prior to conducting the work for any modifications to the referenced “Standard Specifications” and Technical

Specification Sections.

C. Data and Test Reports:

1. Aggregate Base Course: Sources, gradation, liquid limit, plasticity index, percentage of wear, and other tests required by (Caltrans).

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2. Asphalt Base/Surface Course: Aggregate source, gradation, soundness loss, percentage of wear, and other tests required by (Caltrans).

3. HMA Job-mix formula.

D. Certifications:

1. Asphalt prime and tack coat material certificate of conformance with

(Caltrans) Standard Specifications.

2. Asphalt cement certificate of conformance with (Caltrans) Standard

Specifications.

3. Job-mix certification - Submit plant mix certification that mix equals or exceeds the (Caltrans) Standard Specifications.

1.5 CONTROL OF WORK AND MATERIALS

A. The Contracting Officer Representative (COR) shall have access to all parts of the material producing plants for checking the mixing operations and materials and the adequacy of the equipment. The COR will make all decisions for the VA regarding the acceptability of materials furnished, work performed, and work progress.

B. The Contractor is responsible for the proper coordination of all contractors, utilities, and subcontractors engaged in the work within and adjacent to the contract site.

C. All work which does not conform to the requirements of the contract and technical specifications shall be considered unacceptable. The COR may direct the Contractor to remove any portion of the work performed under this contract for inspection or for any other purpose.

D. All work shall be in satisfactory condition at the time of contract acceptance. Any work done or materials used without inspection by an authorized Contracting Officer Representative may be ordered removed and replaced at the Contractor's expense.

E. Unacceptable work, whether caused by poor work, defective materials, damage through carelessness or any other cause found to exist prior to the final acceptance of the work, shall be removed immediately and replaced in an acceptable manner to the COR.

F. All materials used in the work shall meet the quality requirements described in Division XI – “Materials” of the (Caltrans) “Standard

Specifications”.

G. All Materials shall be inspected, sampled, and tested by a state certified testing company paid for by the Contractor. Contractor shall submit to the COR the qualifications and certifications of such Testing Company within ten (10) days of the Notice to Proceed.

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H. Once the Testing Company is approved by the COR, the Contractor shall submit to the COR a detailed Testing Schedule ten (10) days in advance of any work.

I. Whenever any specification provides for Manufacturer’s Certification, Material Certification or Approved List as a Basis of Acceptance, the VA reserves the right to sample and / or test material in any shipment prior to incorporation in the work.

J. Any material which is rejected because of failure to meet the required tests or that has been damaged to cause rejection, shall be immediately removed from the site of the work by the Contractor at no additional cost to the VA.

K. The Contractor shall protect and preserve all government property, including all existing vegetation, existing landscape features, and monuments within, along, and adjacent to the Project area.

L. All areas disturbed by the Contractor shall be restored to an immaculate and COR acceptable condition, particularly those areas within sight of the visitors and public. Where deemed necessary by the COR, the Contractor shall submit a grading plan to include the sequence of operations, erosion and sediment controls, final slopes and surface restoration details.

M. All damage, direct or indirect, of whatever nature resulting from the performance of the work or resulting to the work during its progress from whatever cause, including omissions and supervisory acts of the VA, shall be borne and sustained by the Contractor, and all work shall be solely at its risk until it has been finally inspected and accepted by the COR.

N. The Contractor shall manage all surplus materials and waste generated in the performance of the contract in accordance with applicable federal, state, and local laws and regulations. Nothing herein is intended to prevent the Contractor from removing surplus materials or waste to appropriate off-site locations for beneficial reuse, recovery, or recycling purposes.

1.6 REFERENCE STANDARDS & APPLICABLE PUBLICATIONS

A. The Reference Standards and Publications listed below form a part of this

Technical Specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. State of California Department of Transportation (Caltrans):

“Standard Specifications” (2018).

“Construction Manual” (MCT 17-1)

“California Test Method 375” (Latest Edition)

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C. American Association of State Highway and Transportation Officials

(AASHTO):

HMWB....................Standard Specifications for Transportation

Materials and Methods of Sampling and Testing, 2017 Edition

HMAPG-1.................Designing HMA Mixtures with High RAP Content: A

Practical Guide

M147-17 ................Standard Specification for Materials for

Aggregate and Soil-Aggregate Subbase, Base, and

Surface Courses, 2017 Edition

PDCM-1..................Pavement Design, Construction, and Management:

A Digital Handbook, 1st Edition

R050-09.................Standard Practice for Geosynthetic

Reinforcement of the Aggregate Base Course of

Flexible Pavement Structures, 2009 Edition

T019MT019-14............Standard Method of Test for Bulk Density ("Unit

Weight") and Voids in Aggregate, 2014 Edition

T027-14.................Standard Method of Test for Sieve Analysis of

Fine and Coarse Aggregates, 2014 Edition

D. American Society for Testing and Materials (ASTM):

C29-17..................Standard Test Method for Bulk Density ("Unit

Weight") and Voids in Aggregate

C977-10.................Standard Specification for Quicklime and

Hydrated Lime for Soil Stabilization

D8-18...................Terminology Relating to Materials for Roads and

Pavements

D140-16.................Practice for Sampling Bituminous Materials

D946-15.................Specification for Penetration-Graded Asphalt

Cement for Use in Pavement Construction

D2397-17................Standard Specification for Cationic Emulsified

Asphalt

D3786-18................Standard Test Method for Bursting Strength of

Textile Fabrics—Diaphragm Bursting Strength

Tester Method

D4355-14................Standard Test Method for Deterioration of

Geotextiles by Exposure to Light, Moisture and

Heat in a Xenon Arc Type Apparatus

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D4632-15................Standard Test Method for Grab Breaking Load and

Elongation of Geotextiles

D6373-16................Standard Specification for Performance Graded

Asphalt Binder

D6390-17................Standard Test Method for Determination of Drain down Characteristics in Uncompacted Asphalt

Mixtures

D6690-15................Standard Specification for Joint and Crack

Sealants, Hot Applied, for Concrete and Asphalt

Pavements

E. National Asphalt Paving Association (NAPA):

TB1-16..................Hot Mix Asphalt Materials, Mixture Design and

Construction

TAS-15..................Rolling & Compaction of HMA Pavements

QIP-128E-13.............Best Practices for Emulsion Tack Coats

PART 2 - PRODUCTS / EQUIPMENT

2.1 GENERAL

A. All materials, testing, execution, and related work shall conform to the

California Department of Transportation (Caltrans) ‐ “Standard

Specifications” ‐ latest edition or Project Manager approved equal. Where the term "Engineer" is referenced in the “Standard Specifications”, it shall mean the VA Contracting Officer Representative (COR).

2.2 MILLING EQUIPMENT

A. Use a self-propelled unit capable of removing the existing asphalt pavement to the depths, widths and typical sections shown in the contract.

B. Use milling machines designed and built exclusively for pavement milling operations and with sufficient power, traction and stability to accurately maintain depth of cut and slope.

C. Use milling machines equipped with an electronic control system that will automatically control the longitudinal profile and cross slope of the milled pavement surface.

D. Use a milling machine and loading equipment capable of loading milled material to be used in other parts of the work without segregation.

Provide additional equipment necessary to satisfactorily remove the pavement in the areas of manholes, water valves, curb, gutter and other obstructions at no additional cost to the NCA.

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2.3 HOT MIXED ASPHALTS

A. ASPHALT PAVEMENT SHALL BE IN ACCORDANCE WITH (CALTRANS) STANDARD

SPECIFICATIONS SECTION 39 – “Asphalt Concrete, including all applicable referenced Sections in Division XI – “Materials”.

B. Asphalt Mix Design and submittals shall be in accordance with Section 39

– “Asphalt Concrete” of the (Caltrans) Standard Specifications.

C. Type “A” HMA with aggregate gradation of 3/8 inch shall be used for all committal shelter drives milled surfaces.

D. Type “A” HMA with aggregate gradation of 1/2 inch shall be used for upper

3 inches of wearing surface for all work associated with Project “I”.

2.4 ASPHALT BINDER

A. Provide Asphalt Binder material in conformance with Section 92 – “Asphalt

Binders” of the (Caltrans) “Standard Specification”, including all applicable referenced sections in Division XI – “Materials”.

B. Performance Grade or PG Modified Asphalt Binders shall conform with

Section 92-1.02 “Materials” of the (Caltrans) “Standard Specifications”.

C. PG Modified Asphalt Binder with Crumb Rubber is allowed if it is homogenous and contain no highly visible parts of rubber.

2.5 ASPHALT PRIME / TACK COAT

A. Tack coat composition and application rate shall conform to (Caltrans)

Standard Specifications - Section 39 – “Asphalt Concrete”.

B. Tack Coat shall have a maximum ratio of water to asphaltic emulsion of 2 to 1 and conform with Section 39 – “Asphalt Concrete” of the (Caltrans)

Standard Specifications and Section 39-2.01B (10)” Tack Coat”.

C. Prime Coat shall be slow-setting grades of asphalt emulsions RS1 grade

Asphaltic Emulsion or Project Manager approved equal.

2.6 JOINT SEALER

A. Provide a hot applied Joint Sealer to all cracks exposed by the milling process. Such Joint Sealer material shall conform to ASTM D6690.

B. Make submittal of Joint Sealer material to Project Manager prior to use.

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PART 3 - EXECUTION

3.1 GENERAL

A. Prior to any Roadway Repair / Rehab work, the Contractor shall conduct an adequate surface inspections, testing, and investigations to ensure that pavements structural integrity is sound for the proposed work.

B. For pavement sections with rutting or cracking distress caused by localized subgrade failures and drainage problems, subsurface repairs such as “Full Depth Pavement Repair” shall be performed prior to Roadway

Rehab improvements.

C. Contractor shall ensure that all manholes, valve boxes, catch basin grates or other structures located in the pavement are identified, protected during the Milling process, and reset to finished roadway surface once the (HMA) overlay has been placed.

D. During construction the Contractor is responsible for site safety, traffic control, staging / stockpile area, surface preparation, application conditions / rate / type, quality issues, and post construction conditions and treatments. “Temporary Traffic Control” shall conform to the

(Caltrans) ‐ “Standard Specifications” ‐ Section 12 – “Temporary Traffic

Control” at the Contractor’s own expense.

E. Contractor shall ensure that all utility access structures, manholes, valve boxes, catch basin grates or any other structure within the roadway shall be raised and set to within 1/4‐inch of the final finished grade prior to top course paving.

F. Should any material and or installation be determined by the COR not to be in accordance with the requirements of the (Caltrans) Standard

Specifications, the Contractor shall, at his own expense, correct the unacceptable material and or installation.

3.2 MILLING

A. Mill the existing pavement to restore the pavement surface to a uniform longitudinal profile and cross section in accordance with the Drawings, Statement of Work, and Contract requirements.

B. Operate the milling equipment to prevent damage to the underlying pavement structure, utilities, drainage facilities, curb and gutter, other paved surfaces and any other government property.

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C. Produce milled pavement surfaces that are reasonably smooth and free of excessive scarification marks, gouges, ridges, continuous grooves or other damage. Replace teeth in the Milling Drum immediately if they become dislodged, broken, or unevenly worn.

D. Milling Contractor shall minimize the amount of dust being emitted. Plan and conduct the operation so it is safe for persons and property adjacent to the work including the cemetery workers and visitors.

E. Thoroughly clean the milled pavement surface of all loose aggregate particles, dust and other objectionable material. Millings for this

Project will be stockpiled on the Cemetery property in locations as directed by the Cemetery Director or COR.

F. Check at least every 100 feet to ensure that the depth of the milling is within 1/4 inch of the desired depth. Note findings and submit results to the COR and Project Manager daily.

G. Provide a hot applied Joint Sealer to all cracks exposed by the milling process. Such Joint Sealer material shall conform to ASTM D6690.

H. In areas inaccessible to the Milling Machine use other appropriate equipment. Upon completion of milling, use a mechanical sweeper to clean the milled surface areas before subsequent resurfacing.

3.3 ASPHALT PRIME / TACK COAT

A. Apply tack coat to existing asphalt surfaces in accordance with Section

39 – “Asphalt Concrete” of the (Caltrans) “Standard Specifications”.

B. Contractor shall provide tack coat between each course of pavement if more than four (4) hours have elapsed since prior course was installed.

C. Apply tack coat only when the surface to be treated is dry and when the atmospheric temperature measured at the location of the paving operation away from artificial heat is 45°F or above. Do not apply tack coat when the weather is foggy or rainy.

D. Ensure that the existing asphalt or concrete surface is free of all dust and foreign material before applying the tack coat.

E. Apply tack coat uniformly across the existing surface at target application rates of 0.10 gallons per square yard. Apply tack coat as directed and in the presence of the COR. Provide proof of application rate to the COR as part of the work.

F. Take necessary precautions to limit the tracking or accumulation of tack coat on either existing or newly constructed pavements.

G. Apply tack coat to contact surfaces of headers, curbs, gutters, manholes and vertical faces of old pavements.

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H. After the tack coat has been applied, protect it until it has cured for a sufficient length of time to prevent it from being picked up by traffic.

I. Prime Coat shall be RS1 grade Asphaltic Emulsion spread at the rate of

0.30 gallons per square yard when placed on subbase material prior to asphalt binder or asphalt top course.

3.4 FULL DEPTH PAVEMENT REPAIR

A. Subbase for “Full Depth Pavement Repair” shall consist of a minimum of twelve (12) inches of compacted Class 1 aggregate. The subbase depth shall be increased to eighteen (18) inches, at no additional cost to the NCA if soil conditions dictate or if ordered by the COR.

B. Subbase material shall provide a stabilized surface and shall be installed in accordance with Section 23 – “General” and Section 25 – “Aggregate

Subbases” of the (Caltrans) Standard Specifications. Subbase shall be installed in lifts not to exceed 6‐inches on all roadway repair and rehab improvements.

C. The Subgrade shall be prepared in accordance with Section 25 – “Aggregate

Subbase” of the (Caltrans) Standard Specifications. The Subgrade shall be compacted to 95% Standard Proctor (ASTM D698).

D. “Full Depth Pavement Repair” includes providing asphalt binder course to match existing depth and material on compacted subbase material.

Contractor to install in accordance with all applicable parts of Section

39 - “Asphalt Concrete” and Section 92 – “Asphaltic Binders” of the

(Caltrans) Standard Specifications.

3.5 QUALITY MANAGEMENT FOR ASPHALT PAVEMENTS

A. The Contractor shall use density gauge readings as the method of density control for the paving work. Provide to the COR the written results of the density gauge readings at the end of each day of paving.

B. Perform density sampling and testing on all pavements as required by

Section 39-2.02 “Type A Hot Mixed Asphalt”. Density testing to be performed by Contractor hired third party.

C. Density Requirements: Shall be Minimum 93% of the maximum unit weight on any one density sample. Minimum Average of 95% for any one Project area.

D. Frequency of density test shall be once per 500 linear feet of roadway or once per every 500 square yards for each Project area. Submit third Party

Nuclear Gauge Density Testing Daily to COR and Project Manager.

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E. The COR will evaluate the asphalt pavement for density compliance after the asphalt mix has been placed and compacted using the Contractor's quality control test results.

F. There will be NO Paving work done during or immediately following any measurable rain event or if the air temperature falls below 45°F.

3.6 PLACEMENT OF ASPHALTIC PAVING

A. At least 10 days before start of asphalt mix production, submit the mix design to the COR and Project Manager for review and approval.

B. Remove all loose materials from the paving surface and apply the specified tack coat where required, and allow to dry in accordance with the manufacturer’s recommendations.

C. Placement of Asphalt material in accordance with Section 39 – “Asphalt

Concrete” of the (Caltrans) “Standard Specifications”.

D. Paving over a tack coat should not commence until the emulsion has broken

(goes from brown to black) or is tacky when touched.

E. Prior to placement of specified thickness Surface Course, the Contractor shall place a truing course / leveling course at locations ahead of the paving operation to ensure proper crown and extra pavement thickness to promote adequate surface drainage to storm inlets.

F. Contractor shall provide a truing and leveling course at his expense prior to the top surface course paving for all paving work.

G. Provide pavers capable of spreading Surface Course of Hot Mixed Asphalt plant mix material in lane widths or similar construction applicable to the specified typical section and thicknesses shown on the Drawings or as needed to promote proper drainage on the roadway surface.

H. Immediately after the asphalt mixture has been spread, struck off and surface and edge irregularities adjusted, thoroughly and uniformly compact the pavement. Compact the mix to the required degree of compaction for the type of mixture being placed.

I. Compact all final wearing surfaces using the appropriate size roller.

Rollers shall conform to requirements outlined in Section 39-2.01C(15)of the (Caltrans) Standard Specifications.

J. Rolling: After the material has been spread to the proper depth, roll until the surface is hard, smooth, unyielding, and true to the thickness and elevations shown own the Drawings. Roll in at least two directions until no roller marks are visible.

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K. In areas that are inaccessible to standard rolling equipment, thoroughly compact the mixture by the use of small rollers. Hand operated mechanical tampers shall not be used without receiving approval of the COR.

L. When the placing of the mixture is to be suspended long enough to permit the mixture to become chilled, construct a transverse joint.

M. Finished paving smoothness tolerance: No depressions which will retain standing water. No deviation greater than 1/8-inch in six feet.

N. When corrections to the pavement work is required, the COR shall approve the Contractor’s method of correction.

O. Maintain the new Asphalt Pavement in an acceptable condition until final acceptance of the work has been approved by the COR.

3.7 RESTORATION

A. The Contractor shall protect and preserve all public and private property, including all existing vegetation, existing landscape features, and monuments within, along, and adjacent to the Limits of the Work.

B. All areas disturbed by the Contractor shall be restored to a pleasing and acceptable condition, particularly those areas within sight of the finished roadway or other paved areas. All such areas shall present a pleasing appearance to visitors on the Cemetery grounds.

C. Where deemed necessary by the COR, the Contractor shall submit a grading plan. Grading plans shall include the sequence of operations, the erosion and sediment controls, final slopes and surface restoration details.

D. The restoration of disturbed areas shall be accomplished prior to Contract final acceptance and final payment.

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