3-29
309.11 Basis of Payment The accepted quantity of Full De pth Recycled Pavement
with Foamed Asphalt shall be paid for at the contract unit pric e per yd2, complete in-place to the specified limits, which price shall be full compensation fo r furnishing all equipment and labor for pulverizing, blending, placing, grading, compacting a nd for all incidentals necessary to complete the work i ncluding asphalt binder, water, Portland Cement, lime, and crusher dust. The addition of materials to restore profile grade and/or cross -slope in areas shown on the plans or described in the construction notes will be paid s eparately under designated pay items within the contract. No additional payment will be made f or materials salvaged from the project. Payments will be made under: P a y I t e m Pay Unit
309.35 Full Depth Recycled Pavement with Foamed Asphalt 5 in de pth Square Yard
309.36 Full Depth Recycled Pavement with Foamed Asphalt 6 in de pth Square Yard
SECTION 310 - PLANT MIXED RECYCLED ASPHALT PAVEMENT
310.01 Description This work shall consist of the removal of a ll bituminous pavement
from the existing roadway, hauling the bituminous pavement to a n approved location, and processing as per Section 310.020. The gravel base of the exis ting roadway shall be regraded and compacted to the tolerances shown on the typicals, or as directed by the Resident. All plant mixed recycled asphalt pavement shall be placed in on e or more courses on an approved base and in accordance with these specifications, and in reasonably close conformity with the lines, grades and thicknesses indicated on the plans, or as established by the Resident. Excess recycled material not used in the PMRAP p rocess will become the property and responsibility of the contractor. 310.020 Composition of Mixture The mixture shall be composed a s directed in the job mix formula. The recycled asphalt pavement shall be processed b y the Contractor so all material will be no larger than 1 ½ inch and stockpiled so as t o minimize segregation. The stockpile shall be free of any materials not generally consider ed to be asphalt pavement. If additional material is required, the material will be supplied by the Department or acquired from the Contractor through the C ontract Modification process. A job mix formula shall be furnished by the Department establis hing the percentage of emulsified asphalt cement, Portland Cement, aggregate, and wate r to be used in the mixture. The JMF additive proportions will be verified by taking a secon d recycled material sample once the stockpiles have been constructed. 3-30 Emulsion, water, aggregate and Portland Cement shall be added i n percentage by weight and verified by tank checks done in accordance with the minimum quality control frequencies. Cement additive may be done in dry form or introdu ced as a cement slurry. 310.021 Emulsified Asphalt The emulsified asphalt shall be gra de MS-2, MS-4, CSS-1, or HFMS-2 meeting the requirements of Section 702.04 - Emulsifi ed Asphalt. 310.022 Portland Cement Portland Cement shall be Type I or II meeting the requirements of AASHTO M85. 310.023 Water Water shall be clean and free from deleterious c oncentrations of acids, alkalis, salts or other organic or chemical substances. 310.024 New Aggregate New aggregate, if required by the contra ct or job mix, shall meet the requirements of Sec tion 411.02 - Untreated Aggregate S urface Course. 310.030 Mixing Plant The mixing plant shall be of sufficient c apacity and coordinated to adequately handle the proposed construction. Either a conti nuous pugmill mixer or a continuous drum type mixing plant shall be used. If a drum mix ing plant is used it shall meet the requirements of Section 401.07. The mixing plant shall be capable of producing a uniform mixture meeting the requirements of the job mix formula . 310.031 Hauling Equipment Trucks used for hauling the mixture shall meet the requirements of Section 401.08. 310.032 Pavers Pavers shall meet the requirements of Section 4 01.09. 310.033 Rollers Rollers shall meet the requirements of Section 401.10. Mix Design The Department will supply a mix design for the PMR AP material prior to construction which includes the following information:
1.Percent of emulsified asphalt to be used. 2. Quantity of cement to be added. 3. Optimum moisture content for proper compaction. 4. Additional aggregate (if required). After a test strip has been completed or as the work progresses , it may be necessary for the Resident to make necessary adjustments to the mix design. C hanges to compensation will be in accordance with the Mix Design Special Provision. 310.040 Mixing The recycled asphalt pavement shall be delivere d to the mixer at a temperature of not less than 50°F. The emulsified asphalt shall meet the mixing temperature requirements listed in Section 702.05 - Application Temperature s. Recycled pavement and emulsified asphalt, and cement shall be proportioned and the mi xing time set to produce a 3-31 mixture in which uniform distribution of the emulsified asphalt and coating of the recycled pavement is obtained. If a drum type mixing plant is used, the recycled asphalt pavem ent may be heated prior to being mixed with the emulsified asphalt to a temperature not to exceed 195°F. Following mixing, the recycled asphalt pavement material shall be stockpiled and incorporated into the work. The material must be stockpiled, bu t not for longer than 48 hours. 310.041 Weather Limitations The plant mixed recycled asphalt p avement shall be performed when: a PMRAP operations will be allowed between May 15 th and September 15th inclusive in Zone 1 - Areas north of US Rout e 2 from Gilead to Bangor and no rth of Route 9 from Bangor to Calais. PM-RAP will be allowed between May 1st and September 30th inclusive in Zone 2 - Areas s outh of Zone 1 including the US Ro ute 2 and Route 9 boundaries. b The atmospheric temperature, as determined by an approved the rmometer placed in the shade at the recycling location, is 500F and rising. c When there is no standing water on the surface. d During generally dry conditions, or when weather conditions a re such that proper pulverizing, adding, mixing, and c uring can be obtained using p roper procedures, and when compaction can be accomplished as determined by the Reside nt. e When the surface is not frozen and when overnight temperature s are expected to be above 32 0F. 310.042 Spreading and Finishing The mixture shall be spread an d finished in accordance with Section 401.15. Total layer thicknesses greater than 4 inches shall be placed in 2 lifts. 310.043 Compaction Compaction of the mixture shall be in accor dance with Section
401.16 Rolling may be delayed to avoid lateral displacement as directed by the Resident.
See also Section 310.051. 310.044 Joints Joints shall be constructed in accordance with Section 401.17. 310.045 Surface Tolerances The surface tolerances shall be as specified in Section 401.101, except that the maximum allowable variation shall be ⅜ inch. The surface tolerance in existing gravel areas covered by PMRAP, with no ad ditional gravel, shall be ± ⅜ inch. 310.050 Quality Control The Contractor shall operate in accorda nce with the approved Quality Control Plan (QCP) to assure a product meeting the cont ract requirements. The QCP shall meet the requirements of Section 106.4 – Quality Cont rol and this Section. The 3-32 Contractor shall not begin recycling operations until the Depar tment approves the QCP in writing. Prior to performing any recycling process, the Department and t he Contractor shall hold a Pre-recycle conference to discuss the recycling schedule, typ e and amount of equipment to be used, sequence of operations, and traffic control. A copy o f the QC random numbers to be used on the project shall be provided to the Resident. All field and plant supervisors including the responsible onsite recycling process supervisor s hall attend this meeting. The QCP shall address any items that affect the quality of the Recycling Process including, but not limited to, the following:
a.JMF(s). b. Mixing details, pugmill type, production rates, material pro cessing.
c.Make and type of paver(s). d. Make and type of rollers including weight, weight per inch o f steel wheels, and average contact pressure for pneumatic tired rollers.
e.Testing Plan. f. Transportation including process for ensuring that truck bod ies are clean and free of debris or contamination that could adversely affect the finishe d product, type of release agent used (if required)
g.Laydown operations including pro cedures for mix design modif ication, avoiding recycling and curing in inclement weather, material yield monit oring, methods to ensure that segregation is minimized, longitudinal joint constr uction, procedures to determine the maximum rolling and placing speeds based on field quality control, and achieving the best possible smoothness.
h.Methods for protecting the finished product from damage and procedures for any necessary corrective action.
i.Method of grade checks. j. Examples of Quality Control forms. k. Name, responsibilities, and qualifications of the Responsibl e onsite Recycling Supervisor experienced and knowledgeable with the process.
l.Method for calibration/verification of density gauge. m. A note that all testing will be done in accordance with AASH TO and MaineDOT/ACM procedures.
n.Stockpile procedures including method of moisture control. The Project Superintendent sha ll be named in the QCP, and the r esponsibilities for successful implementation of the QCP shall be outlined. The Contractor shall sample, test, and evaluate the PMRAP proce ss in accordance with the following procedures and minimum frequencies: MINIMUM QUALITY CONTROL FREQUENCIES Test or Action Frequency Test Method 3-33 Density 1 per 1000 feet / lane ASTM D 2950 Air Temperature 4 per day at even intervals Surface Temperature At the beginning and end of each days operation Yield of all materials (Both the daily yield and yield since last test) 4 per day at even intervals The Department may view any QC test and request a QC test at an y time. The Contractor shall submit all QC test reports and summaries in wr iting, signed by the appropriate technician, to the Department’s onsite representati ve by 1:00 P.M. on the next working day, except when otherwis e noted in the QCP due to loca l restrictions. The Contractor shall make all test results, including randomly samp led densities, available to the Department onsite. Penalties for QCP non-compliance will be in accordance with Sta ndard Specification 106.4.6 The Contractor shall cease recycling operations whenever one of the following occurs:
a.The computed yield differs from the approved Job Mix Formul a by 10% or more.
b.The Contractor fails to follow the approved QCP. c. The Contractor fails to achieve 98% density after correcti ve action has been taken.
d.The finished product is visually defective, as determined by the Resident. Recycling operations shall not resume until the Contactor and t he Department agree on the corrective action to be taken. 310.051 Test Strip The contractor shall assemble all items of equipment for the recycling operation on the first day of the recycling work. The Contractor shall construct a test strip for the project at a location approved by the Reside nt. The Responsible onsite Recycling Supervisor will work with Department personnel to det ermine the suitability of the mixed material, moisture control within the mixed material, and compaction and surface finish. The control section is required to: a Demonstrate that the equipment and processes can produce recy cled layers to meet the specified requirements; b Determine the effect on the grading of the recycled material by varying the forward speed of the paving machine; and; c Determine the sequence and manner of rolling necessary to obt ain the compaction requirements and establish a target density. The Contractor and the Department will both conduct testing with their respective gauges at this time. The test strip shall be at least 300 feet in length of a full lane-width (or a half-road width). Full PMRAP production will not begin until an acceptabl e test strip has been 3-34 constructed. If a test strip fails to meet the requirements of this specification, the Contractor will be required to repair or replace the control section to th e satisfaction of the Resident. Any repairs, replacement, or duplication of the control section will be at the Contractor’s expense. The test strip shall be rolled using the specified compaction e quipment as directed until the density readings show an increase in dry density of less th an 1 pcf for the final four roller passes of each roller. The Contractor and Department wil l each determine a target density using their respective gauges by performing several add itional density tests and averaging them. The average of these tests will be used as the target density of the recycled material for QC and Acceptance purposes. Following completion of the test strip, compaction of the mater ial shall continue until a density of not less than 98 percent of the test strip target de nsity has been achieved for the full width and depth of the layer . During the construction and compaction of the PMRAP, should three consecutive Acceptance test results for density fa il to meet a minimum of 95 percent of the target densit y, or exceed 102 percent of target density, a new test strip shall be constructed. ACCEPTANCE TEST FREQUENCY Property Frequency Test Method In-place Density 1 per 2000 ft / lane ASTM D 2950 310.052 Repairs Repairs and maintenance for the PMRAP layers, during and after the curing period, resulting from damage caused by traffic, weather or environmental conditions, or caused by the Contractor’s operations or equipme nt, shall be completed at no additional cost to the Department. Low areas will be repaired using a hot mix asphalt shim course. Areas up to 1 inch high can be repaired by milling or shimming with hot mix asphalt. Ar eas higher than 1 inch will be repaired using a hot mix asphalt shim. All repair work will be done with the Resident’s approval at the Contractor’s expense.
310.06 Curing No new hot mix asphalt pavement or additional la yers of PMRAP shall
be placed on the recycled asphalt pavement until a curing perio d of (4) four days has elapsed. The curing period starts once the PMRAP has been place d in the roadway. When weather conditions are unfavorable, the curing period may be ex tended by the Resident.
310.07 Method of Measurement Plant Mixed Recycled Asphalt Pave ment shall be
measured by the square yard.
310.08 Basis of Payment The accepted quantity of Plant Mixed Recycled Asphalt
Pavement will be paid for at the contract unit price per square yard, complete in-place which price will be full compensation f or furnishing all equipment an d labor for removing existing 3-35 pavement, regrading and compacting existing gravel base, proces sing, mixing, testing, placing, and compacting, excess material relocation, and for al l incidentals necessary to complete the work. Payments will be made under: Pay Item P a y U n i t
310.23 3 inch Plant Mixed Recycled Asphalt Pavement S q u a r e Y a r d
310.24 4 inch Plant Mixed Recycled Asphalt Pavement S q u a r e Y a r d
310.25 5 inch Plant Mixed Recycled Asphalt Pavement S q u a r e Y a r d
310.26 6 inch Plant Mixed Recycled Asphalt Pavement S q u a r e Y a r d
SECTION 311 - COLD IN-PLACE RECYCLED ASPHALT PAVEMENT (Traveling Pugmill)
311.01 Description The Contractor shall construct a Cold In-place Recycled
Pavement base course in accordance with the Contract documents and in reasonably close conformity with the lines, grades, thicknesses, and typical cro ss sections shown on the plans or as established by the Resident. This work will consist of mi lling 3 to 7 inches of existing bituminous pavement, pulverizing and sizing the millings, the a ddition of emulsified asphalt and Portland Cement or hydrated lime to the proportions specifi ed, the mixing and placement of the mixture full width as required in the contract , (including shoulders) and compacting the mixture as one continuous operation to the lines , grades and thicknesses indicated on the plans or as established by the Resident. Exces s recycled material not used in the CIP process will become the property of the State. MIX DESIGN
311.02 Composition of Mixture The Contractor shall provi de the Resident with a
proposed mix design a minimum of two weeks prior to commencing work. The proposed mixed design shall include the emulsified asphalt binder applic ation percentage, type and supplier, the percentage of Portland Cement or hydrated lime to be added, and the percentage of any supplemental aggregates to be added. a The aim for air voids in the final product is 8 to 11%. b The Contractor may add water as needed to the sized material to facilitate uniform mixing and compaction. c Included in the mix design will be the product information fr om the supplier of the asphalt emulsion binder and any product information regarding t he Portland cement or hydrated lime.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 246–252 of 817.