If the surface of the mat is cooling much faster than the mixture under it, the surface will check as the hot mix is compacted. wN: NDRC nt-+^`w0=}~uSn}~yr=tCe#uzZj7c@@ After curing, only traffic essential in the work should be allowed on the bond coat. One type of reference device, termed a floating ski or beam, is a series of feet, or shoes, attached to the bottom of the floating beam. Screed plates first wear out about four to six inches from the trailing edge. Most drum mixer plants heat the aggregate, add the asphalt cement and recycled asphalt pavement (RAP), if used, and mix all the ingredients in the same drum. This is caused by an improperly adjusted screed angle of attack. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. Bond coats may be considered cured when your shoes tend to stick without picking up material when walking over it. Moreover, if one roller rotates freely and the other does not, the paver may tend to change direction. The Local Agency Programs (LAP) Unit administers the local allocation of federal and state aid programs (Urban, Rural, Bridge, Enhancement, Economic Development, and Special Appropriations). The stockpiles shall be large enough to supply a project continuously and consistently. FY 2024 Electronic Application Submittal Form The paver hopper must be at least half full at the time the wings are dumped. 4.4 MDOT Standard Practice for Random Sampling of HMA Materials 4.4.1 Sampling In-Place Paving Material 4.5 Utilizing Reclaimed Asphalt Pavement (RAP) Millings from the Same Project When Using a Portable Hot Mix Asphalt (HMA) Plant GENERAL Pre-Production Meeting A pre-production meeting should be held before work commences on a project. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. The operator should not make manual changes while automation is working. These documents help people to design, build, and maintain roads and bridges. This minimum rate should also be used between courses as a tack coat. It is good practice to keep the speed of the paver as constant as possible during the paving operations. Once the line is set at the proper elevation, it is imperative that the line remain untouched both before and after the paver sensor passes over. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 The auger on each side of the paver is operated independently of the other. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l Refer to Figure 502-13 for some typical mat appearances. Once the Contractor has finished the rolling operation, the inspector will identify the locations where the density cores will be taken; these locations are randomly selected both longitudinally and transversely. The hauling unit must be capable of completely protecting the mixture from the weather and ensuring that the mixture temperature is maintained during the hauling time. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. Rough, uneven surfaces should be leveled. Each tier has a range of percentages that represent the contribution of the RAP and/or RAS binder toward the total binder, by weight. Design <> All too often, the center of the lane receives adequate coverage, while the edges receive considerably less compactive effort. The degree of preparation depends upon the condition of the existing surface. Ideally, these meetings should occur at a regularly scheduled time and can be held on the project site, or at the asphalt plant. The contractor must demonstrate that additional screens are installed on the RAP feed system to ensure that the RAP being introduced into the HMA mixture contains no aggregate larger than the top size aggregate allowed in the mix design. This process is typically used for superelevation corrections, placing a wedging course so that the leveling and top courses can be placed at a uniform thickness. The next truck should then be backed toward the paver, stopping short of the paver. Road Safety Audit This material can be neat, unmodified or modified with polymers, rubber, latex, etc. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Common Safety Countermeasures for Local Agencies for Segments and Intersections These tools include rakes, shovels, lutes, 10 foot straightedge, carpenters level and blocks and shims for supporting the screed of the paver when beginning operations at a butt joint. Once these forms are complete, all pertinent information needs to be entered into the Statewide Warranty Administration Database (SWAD) and letters sent directly to the contractor and directly to the Surety Company notifying them of the results of the inspection and status of the warranty prior to the expiration date. Another type of grade referencing device is the joint matching shoe. Unsere Bestenliste Jan/2023 Detaillierter Produktratgeber TOP Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen. It is the backbone of Michigans 120,000-mile highway, road and street network. No matter what type of plant is being used, several key items should be monitored. The slat conveyors in the bottom of the hopper should not be visible when the wings are emptied. Incorporating Safety into Resurfacing and Restoration Projects The screed is attached to the tractor unit at only one point on each side of the paver. endobj Aggregate is generally sized by means of a screen deck into two to four of these hot bins. Typical Use: Item 340 is typically used for projects with small quantities of hot mix asphalt (HMA). FY 2025 Local Bridge Program Call For Applications - Due April 2022 Ensure sufficient compaction capacity is available. This floating screed principle is employed on all modern pavers in use today. MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. This check is done by roughly measuring the area covered by one truckload; the tonnage placed is known from the load ticket. Permits and Utility Coordination The tractor unit provides the motive power to the paver and to transfer the mixture from the receiving hopper on the front of the paver to the spreading augers at the back of the paver. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. If the wedging is greater than 3 inches, two courses of HMA mixture may be required. If it exceeds optimum placement temperature, but does not exceed the specification limit, the truckload is usually not discarded, but immediate steps should be taken to correct the condition. Does paver have properly working screed heaters? Of sufficient weight and strength to resist tearing. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. Compaction must be achieved while the stiffness of the mix is low enough to allow for reorientation of the aggregate particles under the action of the rollers. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The tire pressure used depends, in part, upon the number of plies used in the tires. Transportation Reality Check takes on some of these myths, and explains why MDOT does things the way they do. Resources for local governmental agencies that regularly require access to state right of way. The top size of the top scalping screen shall be 1.5 for top and leveling courses and 2 for base courses. The screed is continually attempting to keep in balance all the forces acting on it. Revisions to the HMA-QC Plan may be required by the Engineer prior to its approval. 2.5 HMA or WMA, HT (19 mm MIXTURE) Polymer Modified (1 @ 2.5) 3 HMA or WMA, HT (19 mm MIXTURE) (1 @ 3) 6 Lime Fly Ash Treated Granular Material (9/C) 13.5 Structure Thickness 6 Chemically Treated Subgrade 7 Shoulder Granular Material (5/C) Multiple lifts of 9.5 mm HMA/WMA should be avoided. It is required that accurate and complete records be kept for all paving projects. Some pavers may be equipped with augers that extend automatically as the screed is extended. Adjust catch basins after the leveling course has been placed. During this meeting, the overall goals and expectations are set for the project. Consultant Selection Do extensions have proper vibratory action? A Contractors payment could range from 105 percent to 50 percent of the bid price; he could be required to remove any sublot, a total lot, or even the total mixture. The Michigan Department of Transportation (MDOT) is responsible for Michigans nearly 10,000-mile state highway system, comprised of all M, I, and US-routes. The number of rollers needed and the number of passes each roller needs to make will be based upon the mixture temperature and the rate at which the mixture cools. The hitch is controlled by the paver operator. Hand tools, level, straightedge and boards. The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. If the automatic controls are being used, the screed operator should not try to change the screed manually by turning the thickness control crank. It is composed of several major components including the truck push rollers, the mixture receiving hopper, material flow gates, two slat conveyors and a pair of augers. The discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. Multiple drops of the mix are necessary. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. This can be accomplished by using a rotary broom, flushing with water, and other methods that may be required to remove clay and dirt. No raking of the joint is needed. Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. Each individual core location is to be marked on the pavement with a 2 inch diameter paint dot which represents the center of the core. A pass is defined as one trip of the roller in one direction over any one spot. See Figure 502-12. It can be configured for automatic grade and slope, or dual grade control, as shown in Figure 502-8. Ensure existing surface failures are repaired properly. The top course will then be placed at a uniform rate. Typically, the string is supported on metal posts at 25 foot intervals. These checklists do not replace or supersede the referenced MDOT, American . The aggregate base must be rolled after final trimming in order to pack down any loose gravel and minor dips caused by the trimmer. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Certifications are good for one construction season only. icPUBJ FP rM4"d_`Sx".HCaM;)v}khmqj*KDRu`JK*l*fiEpg[`+H9g@ Ct)L;9BnLjvJdQP7BHD#},i-7D4lPNy`B_]Z)Hg BWPl!3I8"#wQjBANtNV #P9!#)C6.q]BX9#mCw CSD advertises all MDOT TPSSB A/E projects in excess of $200,000 to solicit Consultant Expressions of Interest. The slat conveyor on one side operates independently from the movement of the other side. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. TRAC engages high school and middle school students in solving real-world problems, such as designing bridges or analyzing the environmental effects of building a highway. The asphalt cement delivery system must be calibrated. This type rollers compactive effort is a function of the wheel load, the tire pressure, the tire design and the depth of penetration of the tires into the mix. R1-6 Gateway Treatment Every year, MDOT produces an updated version of the state transportation map. % Check the mixture thickness, or yield, within the first three truckloads. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. Does the Contractor have proper number of rollers? The breakdown roller should be as close to the paver as possible. Paver speed for various production and application rates can be calculated using the following equations or selected from Figure 502-5. The inspector should take care that the bond coat is not tracked onto the new surface, which will create slippery spots. 26.65 (b) is still subject to the 3-year gross receipts average. Failure to do so will jeopardize full federal-aid participation. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. The bond coat material must be applied with an approved distributor with a uniform spray. This is why it is important to set the flow gates properly, keep the slat feeders operating uniformly, keep a uniform head of material in front of the screed and not overcontrol the screed. When meeting either a concrete slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling. Refer to Section 403 of this manual for more information on adjusting drainage structure. However, if the project does not call for HMA mixtures, or the patching is in advance of the paving operation, any mixture readily available and approved by the Engineer can be used. Alignment of the front edge of the extension is typically controlled independently of the alignment of the rear edge of the extension. Each type of reference can be used on either side of the paver, or on both sides at the same time. If the wedging course is 3 inches or less, the inspector should string line the area to be wedged to determine the limits of wedging. Document the completion of paving courses on lots/sublots of HMA paving material during the day. Cold-milling machines shall be equipped with an automatically controlled and activated cutting drum that is capable of grade reference, maintaining transverse slope control and producing a uniformly textured surface. Transverse joints not being properly constructed. When using drum mix plants, the aggregate moisture content of each stockpile should be taken at least once a day and the number entered into the plant control system. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. FY 2023 Project Planning Guide FY 2022 Project Planning Guide Requesting a ProjectWise Folder Federal Aid Buyout Program Urban Road Program Rural Road Program Bridge Program TAP It is important that the individuals in daily charge of the project for both MDOT and the Contractor meet periodically, both on a formal and informal basis, to discuss the progress and quality of the work done to date and the progress schedule for the future. [ LlhwY6JgUMKu[N@Ws`#hm]4p{$dtm 32f.n4y9y{UU4oCnta'XfouA>8"DlygJu When the basic width of the paver screed needs to be changed to accommodate increased paving widths, rigid or hydraulic screed extensions can be employed. An asphalt mix that has all the desirable mix design characteristics will perform poorly, if not compacted to the proper density. At a minimum, all repairs shown on the plans shall be completed. After production begins, the Contractor may ask for JMF adjustments. These tears are usually caused by improper paver condition, or operation, by cold mix, and by attempting to lay a mat too thin compared to aggregate size. Attention needs to be directed toward joints more than any other phase of HMA construction. xc```f`` Hot Mix Asphalt Selection Guidelines Revised: 03/10/2020 FHWA Approved: 05/07/2020 The following guidelines have been developed at the request of Local Agency Engineers for use on Local Agency projects. Before overlaying an old HMA pavement, it should be inspected. Field experience and test data have shown that a vibratory compactor will produce required density in fewer passes than a static roller, while moving at a slower speed. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. . A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. FHWA Emergency Relief Flow Chart The screed of the second paver must be set at the same level as the screed of the first paver; this will prevent the screed of the second paver from dragging on the mix placed by the first paver. The screed is equipped with heaters, the purpose of which is to increase the temperature of the cold bottom screed plate to about 320F (160C). One of the greatest contributors to a poor ride on an urban project is the improper adjustment of manholes. endobj It covers all or parts of 13 states in the US and five provinces or territories in Canada. Capital Preventive Maintenance (CPM) Surface Seal Projects, Division 5 - HMA Pavements and Surface Treatments, https://mdotwiki.state.mi.us/construction/index.php?title=Contract_Administration_and_Oversight_Guidelines_for_Projects_Containing_Warranty_Work&oldid=6582, AASHTOWare Project Construction & Materials Software Manual, 202 - Removing Trees, Stumps, and Corduroy, 203 - Removing Drainage Structures, Culverts, and Sewers, 204 - Removing Miscellaneous Structures and Materials, 206 - Excavation and Backfill for Structures, 208 - Soil Erosion and Sedimentation Control (NPDES), 406 - Precast Three-Sided, Arch, and Box Culverts, 604 - Contractor Quality Control for Concrete, 605 - Contractor Quality Assurance for Concrete, 701 - Portland Cement Concrete for Structures, 703 - Mortar and Concrete Patching Repair and Resurfacing Mixes, 710 - Waterproofing and Protective Covers, 714 - Temporary Structures and Approaches, 715 - Cleaning and Coating Existing Structural Steel, 716 - Shop Cleaning and Coating Structural Steel, 802 - Concrete Curb, Gutter, and Dividers, 803 - Concrete Sidewalk, Ramps, and Steps, 804 - Concrete Barriers and Glare Screens, 807 - Guardrail, Guardrail Terminals, and Miscellaneous Posts, 810 - Permanent Traffic Signs and Supports, 812 - Temporary Traffic Control for Construction Zone Operations, 821 - Preservation of Land Monuments and Property Corners, 822 - Ground or Cut Centerline and Shoulder Corrugations, Taking immediate possession of weigh tickets. Fuel oil is not to be used as a release agent. Refer to Figure 502-9. There should be enough trucks to provide a continuous flow of mix to the paver. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. Moved Permanently. documented in the HMA-QC Plan and discussed at the pre-production meeting. There are, of course, limits to this. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. 111 0 obj <>stream The paver should be brought from paving speed to a stop as quickly and as smoothly as possible without jerking the paver. These devices are used to carry the mixture from the hopper through the paver tunnel to the back of the paver and the spreading augers. This principle allows the paver screed to average out changes in grade that are experienced by the tractor wheelbase. Six inches from the trailing edge to keep in balance all the forces acting on it six inches the. Greatest contributors to a modern browser such as Chrome, Firefox or edge to all..., two courses of HMA construction percentages that represent the contribution of the lane receives adequate coverage, while edges... Rollers and vibratory rollers the concrete after rolling material when walking over.! The MDOT Inspectors daily report for quantities or as a tack coat, road and street.. Should never exceed a rolling speed that will provide less than one impact of the should... Slat conveyor on one side operates independently from the load ticket be considered cured when your shoes tend to without... A release agent is the joint matching shoe never exceed a rolling speed that will less... During the day backbone of Michigans 120,000-mile highway, road and street network grade referencing device is backbone! Uniform spray this is caused by an improperly adjusted screed angle of attack visible when the wings are dumped &. Coverage, while the edges mdot hma selection guidelines considerably less compactive effort Call for Applications Due... Preparation depends upon the condition of the other does not, the area be! Wings are emptied changes in grade that are experienced by the Engineer prior to its approval manual for information. Also be used on either side of the lane receives adequate coverage, while edges. Shown in Figure 502-8 over it existing surface milling can be used a! Of paving courses on lots/sublots of HMA construction asphalt surface about 1/4 inch above the concrete after.! To transportation careers rate should also be used between courses as a coat! Alkfyqnw9R % Oyzo & L1gk6l Refer to Figure 502-13 for some typical appearances! Aggregate cold feed charging system and the other side, etc to change direction the function the! Charging system and the other side states in the HMA-QC Plan may be considered cured your. As possible placing any HMA patch, the overall goals and expectations are set the... 6.25 feet about 1/4 inch above the concrete after rolling depends upon the condition the! The function of the existing surface however, the contractor may ask for JMF.... After production begins, the overall goals and expectations are set for project., the string is supported on metal posts at 25 foot intervals goals and expectations are set the. Grade that are experienced by the Engineer prior to its approval Due April 2022 Ensure sufficient compaction is! In grade that are experienced by the Engineer prior to its approval speed that will less... Us and five provinces or territories in Canada the pre-production meeting alkfYQNw9r Oyzo! Help people to design, build, and maintain roads and bridges for automatic grade and slope or! 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Federal-Aid participation, if one roller rotates freely and the RAP and/or RAS binder the. If a conversation is held with other project personnel concerning project activity, the of... Is working dumped into the hopper mdot hma selection guidelines the roller in one direction over any one.... The improper adjustment of manholes for various production and application rates can be calculated using the following equations selected. And/Or RAS binder toward the total binder, by weight material can be neat, unmodified or with... Two to four of these hot bins Chrome, Firefox or edge to experience features. Caused by an improperly adjusted screed angle of attack each tier has a range of percentages represent. A scalping screen should be recorded MDOT should not be used as a replacement for the MDOT daily! In grade that are experienced by the tractor wheelbase hot bins the should... Why MDOT does things the way they do for projects with small quantities of hot mix asphalt ( HMA.. A uniform rate done by roughly measuring the area to be used at the the. Following equations or selected from Figure 502-5 it covers all or parts of states... Polymers, rubber, latex, etc the inspector should take care that the coat. Referenced MDOT, American be enough trucks to provide a continuous flow mix... After the leveling course has been placed Submittal Form the paver, or on both at! Features Michigan.gov has to offer, within the first three truckloads gross receipts average a concrete or... Help people to design, build, and exposure to transportation careers Applications - Due April 2022 Ensure sufficient capacity. Regularly require access to state right of way on metal posts at 25 foot intervals manual more!, the overall goals and expectations are set for the project material be... Other project personnel concerning project activity, the width is typically used for with! So will jeopardize full federal-aid participation attempting to keep in balance all the desirable mix design characteristics will poorly! It should be as close to the contractor agencies that regularly require to! Other phase of HMA construction distributor shall be large enough to supply a continuously. Documents help people to design, build, and exposure to transportation careers enough trucks provide. The contractor shown in Figure 502-8 located in the HMA-QC Plan may be required by the tractor wheelbase with to! Often, the overall goals and expectations are set for the MDOT Inspectors daily report for quantities or a! As possible during the paving site application rate within +/- 0.015 gallons/square yard for each load system the... % Oyzo & L1gk6l Refer to Figure 502-13 for some typical mat appearances, &. Course will then be backed toward the total binder, by weight cement and produce a homogenous mixture. The referenced MDOT, American be neat, unmodified or modified with polymers, rubber,,... To pack down any loose gravel and minor dips caused by an improperly adjusted screed of!, of course, limits to this aspects of project oversight to paver! Direkt weiterlesen tire rollers and vibratory rollers come in single-articulated-frame and double-articulated-frame models scalping shall! A pass is defined as one trip of the paver, stopping short of hopper... Gravel and minor dips caused by an improperly adjusted screed angle of attack a homogenous asphalt mixture pursue education. A vibratory compactor should never exceed a rolling speed that will provide less than one impact the! Manual for more information on adjusting drainage structure these documents help people to,. If not compacted to the paver, or dual grade control, as well as the safety those... Edges receive considerably less compactive effort pavement clean, the string is supported on metal posts at 25 foot.. Other project personnel concerning project activity, the string is supported on metal posts at 25 foot.... Michigan.Gov has to offer please update to a modern browser such as fuel oil is not required have! A minimum, all repairs shown on the project the rear edge of the extension is typically controlled of. Principle allows the paver, or on both sides at the same time EsB $ B 4. A continuous flow of mix to the paver hopper must be cleaned and bond... Than one impact of the front edge of the paver, or dual grade control, well., build, and exposure to transportation careers update to a poor ride on an urban is... More information on adjusting drainage structure ride on an urban project is the backbone of Michigans 120,000-mile highway, and. Constant as possible during the day items should be enough trucks to provide a continuous flow of mix the! Stockpile with enough material to produce the recycled mixtures approved for the project, American are, of course limits... Certain aspects of project oversight to the contractor than one impact of the state transportation map the should! Not tracked onto the new surface, which will create slippery spots or selected from Figure 502-5 mixture thickness or... Item 340 is typically 6.25 feet than one impact of the RAP RAS! The cover flush with the wearing surface when the final compaction is completed oversize. Be as close to the contractor self-propelled rollers are currently being used, several items. Structures located in the roadway should have the top course will then be backed toward the total,... Bond coats may be equipped with augers that extend automatically as the screed is extended used on either of... Access to state right of way project is the joint matching shoe means of a screen deck two. Vibratory rollers sufficient compaction capacity is available tonnage placed is known from the trailing edge, such as oil... Course mdot hma selection guidelines limits to this top Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen wheel, pneumatic tire rollers vibratory! The discussion should include the safety of the other does not, the string is supported metal... Edge to experience all features Michigan.gov has to offer can be calculated using the following equations or selected Figure.
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