4-11 TABLE 4: PLACEMENT CONDITIONS FOR ADJOINING LANES Depth (at centerline) Placement Conditions Vertical Longitudinal Joint ¾” and less (incl. shim) The Contractor may place the HMA course over the full single tr avel lane width for each production day. 1” to 1 ¼” The Contractor may place the HMA course over the full single tr avel lane width for each production day and will be requi red to place a matching course of HMA over the adjacent section of travel lane before weekend or holiday suspe nsion. 1 ½” to 2” The Contractor may place the HMA course over the full single tr avel lane width for each production day and will be requi red to place a matching course of HMA over the adjacent section of travel lane before the end of the following calendar day. Greater than 2” The Contractor shall place each course over the full width of t he traveled way section being paved that day. Notched-Wedge Longitudinal Joint 1 ½” to 2” The Contractor may place the HMA course over the full single tr avel lane width for each production day and will be requi red to place a matching course of HMA over the adjacent section of travel lane before weekend or holiday suspe nsion. A maximum unmatched centerline joint length of 0.5 miles will be permitte d over the weekend. Greater than 2” The Contractor may place the HMA course over the full single tr avel lane width for each production day and will be requi red to place a matching course of HMA over the adjacent section of travel lane before the end of the following calendar day. The Contractor will be require d to place the specified course o ver the full width of the mainline traveled way being paved, regardless of use, depth, or longitudinal joint type prior to Memorial Day, July 4th, Labor Day, paving suspensions exceeding three days, or other dates as specified by special provision. The Contractor shall install additional warning signage that cl early defines the centerline elevation differential hazard. Unless otherwise addressed in th e contract, the Contractor shall install additional centerline delineation such as a doubl e RPM application at 100 foot intervals, or temporary painted line. For any exposed vertical edge between the shoulder and traveled way, at a minimum, the use of temporary painted line, or RPMs placed along the edge of traveled way at 200 foot intervals is required. The Tra ffic Control Plan shall be amended to include this option and the additional requirements. All signs and traffic control devices will conform to Section 719.01, and Section 652, and wi ll be installed prior to the work, at a maximum spacing of 0.50 mile for the entire length o f effected roadway section. If this option is utilized, all additional signing, labor, traf fic control devices, or incidentals will not be paid for directly, will be considered incidental to the appropriate 652 items.
401.14 Hot Mix Asphalt Placement on Bridge Decks Hot mix asph alt pavement placed
on bridges shall also conform to Section 508.04 and the followi ng requirements.
a.The bottom course shall be placed with an approved rubber mo unted paver of such type and operated in such a manner that the membrane waterproof ing will not be damaged in any way.
b.The top course shall not be placed until the bottom course h as cooled sufficiently to provide stability. 4-12
c.The Contractor will not be re quired to cut sample cores from the compacted pavement on the bridge deck, unless otherwis e directed by Special Provis ion.
d.After the top course has been placed, the shoulder areas sha ll be sealed 3 ft wide with two applications of an emulsified bituminous sealer meeting the requirements of Section 612.03 – Sealing and Section 702.12 - Emulsified Bitumi nous Sealing Compound. The first application shall be pre-mixed with fine, sharp sand, similar to mortar sand, as needed to fill all voids in the mix in the area being sealed. The second application may be applied without sand. The sealer sha ll be carried to the curb at the gutter line in sufficient quantity to leave a bead or fillet of material at the face of the curb. The area to be sealed shall be clean, dry an d the surface shall be at ambient temperature.
e.The furnishing and applying of the required quantity of seal er for the bridge shoulder areas shall be incidental to placing the hot mix asphalt paveme nt.
f.The minimum production and placement temperature for the Hot Mix Asphalt placed over membrane shall conform to the manufacturer’s recommendatio ns. The area between the edge of the membrane and the vertical surf ace shall be completely sealed with hot-applied rubberized asphalt material, meeting th e requirements of Type 4 crack seal; shall be applied to form a complete seal between th e membrane and the vertical surface and shall extend up the vertical surface to within ½ in ch of the top of the HMA wearing surface. This work shall be considered incidental to th e contract pavement items unless 508 membrane items are included in the contract.
401.15 Compaction Immediately after the Hot Mix Asphalt Paveme nt has been spread,
struck off, and any surface irregularities adjusted, the Contra ctor shall thoroughly and uniformly compact the HMA by rolling. The Contractor shall roll the surface when the mixture is in th e proper condition and when the rolling does not cause undue displacement, cracking, o r shoving. The Contractor shall prevent adhesion of the HMA to the rollers or vibrating c ompactors without the use of fuel oil or other petroleum based release agents. Solvents desi gned to strip asphalt binders from aggregates will not be permitted as release agents on equi pment, tools, or pavement surfaces. The Contractor shall immediately correct any displacement occur ring as a result of the reversing of the direction of a roller or from other causes to the satisfaction of the Department. Any operation other than placement of variable dep th shim course that results in breakdown of the aggregate shall be discontinued. Any new p avement that shows obvious cracking, checking, or displacement shall be removed an d replaced for the full lane width as directed by the Resident at no cost to the Department. Along forms, curbs, headers, walls, and other places not access ible to the rollers, the Contractor shall thoroughly comp act the HMA with mechanical vib rating compactors. The Contractor shall only use hand tamping in areas inaccessible to all other compaction equipment. On depressed areas, the Contractor may use a trench roller or cleated compression strips under a roller to transmit compression to th e depressed area.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 271–272 of 817.