Can VPM be locked in on vibratory rollers? See Figure 502-7. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. Avoid spraying adjacent completed surfaces that will remain exposed. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. Adjust catch basins after the leveling course has been placed. The Office of Governmental Affairs represents MDOT's interests as new or amendatory legislation is developed or moving through the legislative process. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. The completed centerline joint should be uniform, closed and flush with adjacent lanes. Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received The asphalt tanks and all hot asphalt lines should be insulated. Risk analysis is specifically used to select appropriate performance standards for various bridge . The finished mat should be smooth and free of blemishes. Mixture types to be used and the sampling and testing procedures vary depending on the specifications used. A release agent may be applied to the surfaces of the truck or trailer bed. The screed should be raised and the bottom surface checked for smoothness, twisting, and excessive wear. Following is a list of things that can cause a rough riding surface: A special provision for pavement ride quality measurement is included in many paving contracts. Communication is one of the keys to a safe work environment. USDOT Navigator Website. FY 2023 Project Planning Guide However, the amount of overlap between the first and second lanes is very important. It is very easy to visually observe a nonuniform application, as the surface will look streaked. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. The screed is continually attempting to keep in balance all the forces acting on it. The work should be planned so the bond coat is not applied too far in advance of the paving operation. Transverse joints not being properly constructed. 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. If distortion of the base course occurs during the paving operation, the mixture placement should be stopped until the condition of the base course is corrected. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. Are the water sprinklers in good operating condition? Placing the mat too thin based upon the aggregate size. It may be bubbling or popping as if it were boiling. The tractor unit receives the asphalt mixture from the haul trucks, carries that mixture back to the spreading augers, distributes the mixture across the width of the screed and pulls the screed over that mixture. Does paver have properly working screed heaters? Contract Administration and Oversight Guidelines for Projects Containing Warranty Work Email this Page Contents 1 All Projects 2 Hot Mix Asphalt (HMA) Paving Projects 3 Concrete Paving Projects 4 Capital Preventive Maintenance (CPM) Surface Seal Projects 5 Documentation and Notifications All Projects To convert the yield to mat thickness, the following will be helpful: 110 pounds/square yard = 1 inch of thickness. Load ticket = 46.96 tons x 2000 pounds per ton= 93920 pounds, Area Covered: 421 feet x 12 feet wide/9 sft/syd = 561.33 square yards. One make of paver, however, is equipped with a power extendable screed that places the extendable portion of the screed in front of the main screed. Individuals who are working around the paver are susceptible to being hit by passing traffic and have the potential to be hurt by the equipment being used in the paving operation. A3M+<9HWZ+sFW4vKjfMQ"Lk U.c~TMm:YN u3lS( I1$3vsf 02U^0T[H 4n GI_}M&=MbAcL#' Z9[iW:hF-0T@4fbiB#1e7ME B? The length of temporary taper shall be 5 feet for each inch of mat thickness. FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 This mark can easily be eliminated by adjusting the elevation of the extendable screed in relation to the main screed. Care should be exercised to keep dust to a minimum. Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. Attach copies of the qualification documentation for the sampling technician to the preproduction meeting minutes for each HMA paving project where HMA sampling is required. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. Further, the extension must be set at the same elevation and angle as the basic screed to prevent the presence of a transition line, or ridge, at the intersection of the main screed and the extension. Our goal is to keep Michigan's motorists safe, informed, and mobile. Plants are certified in accordance with the HMA Production Manual. The name of the individual responsible for safety for the Contractor should be provided to MDOT so that rapid and clear communications can be accomplished if safety problems occur. The guidelines illustrate how to collect appropriate data, estimate risk of failure from an estimated failure probability and associated economic losses, and use risk in a structured approach to select an appropriate management plan. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. Because continuity of the asphalt paving operation is critical to providing a quality pavement, the discussion between MDOT and the Contractor personnel should include such items as those listed below. The roller pattern should be set up as soon as paving starts. It is MDOTs responsibility to conduct quality assurance and verification sampling and testing to ensure conformity of the mix to 20SP501(R) Superpave Hot Mix Asphalt Percent Within Limits (PWL) or 20SP501(S) Superpave Hot Mix Asphalt Percent Within Limits (PWL) For Capital Preventive Maintenance (CPM) Mill & Resurface Projects and CPM One Course Overlay Projects.This testing is done at the field laboratory provided by the Contractor located at the asphalt plant or at an MDOT Region Lab. . This section serves to provide guidance for utilizing Reclaimed Asphalt Pavement (RAP) millings from the same project when using a portable Hot Mix Asphalt (HMA) plant. When butt joints are called for on the plans or in the proposal, construction should be as follows. The inspector should contact the Region HMA inspector for guidance. Compaction of the taper section will be required as near to final density as possible. Cold-milling machines may be used to do the work involved in the pay item of removing HMA surface by the square foot (square meter). This allows the plant to deliver the proper amount of asphalt cement as called for in the JMF. The auger on each side of the paver is operated independently of the other. A bond coat is an application of an asphaltic emulsion to an existing surface as a bond or tack coat ensuring adhesion with the overlying surface and preventing displacement ahead of the roller. See Figure 502-6. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. Of sufficient weight and strength to resist tearing. Dividing the tonnage placed, by the area covered, will give the yield. Once the proper yield has been obtained, only periodic checks will be required each day. [v2pBT9V9Y$Zq[Uh q91Ok6b dES 0k$#ti@o8pj#da*4mq9ZZz3WKI!VNTPkpcZ` The top size of the top scalping screen shall be 1.5 for top and leveling courses and 2 for base courses. 115 0 obj <<4c7790beb010dcdd18f2ce7848bb2f38>]>>stream The inspector may use the following checklist to record the condition of equipment. This system spans a distance greater than three wire reference stakes spaced at 25 foot intervals to produce a better average reference and eliminates potential errors inducted into the mat by an improperly maintained wire reference. These gates are used to regulate the amount of mix that can be delivered by the slat conveyors to the augers. FY 2024 Webinar Recording If the temperature exceeds specification limits, 350F, it should be discarded. The asphalt cement delivery system must be calibrated. The slat conveyors in the bottom of the hopper should not be visible when the wings are emptied. The flow gates should be adjusted to provide a uniform head of material in front of the screed. 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. Do extensions have approved method of heating? Profiling is used to establish a new cross section in the existing pavement. x 0 ;r0Do9r\( [v9pWnY?xF 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. Selection. Rollers can also be a combination of both pneumatic and steel wheel. Whenever the temperature of the previously placed mats falls below 170F prior to placement of the adjacent mat, or when placing base mix and the air temperature is below 50F, the vertical edges of the initial mat shall be coated with HMA bond coat material before the mixture is placed in the adjacent section. Loads that have become contaminated because of spilled gasoline, kerosene, oil and the like, should not be used in the roadway. x DH,YZ`XUNC9*F !c+6N The document has moved here. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. When constructing the first lane, a string line should be employed to guide the paver operator to establish a uniform edge. This page was last edited on 19 January 2022, at 13:44. If the extensions on the extendable portion of the screed are not properly aligned with the main screed, a longitudinal mark, or ridge, will occur in the surface of the mix at the junction between the two screeds. Transportation System Performance allows MDOT's regions and engineers to expand their knowledge on how Michigan freeways are operating over time and how they compare to each other. If the aggregate surface is left exposed to the weather, either allowed to dry out or become saturated by rain, sufficient tests must be made immediately prior to placing the mixture to ensure that density requirements are met. 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. Any severely distressed areas in the old rigid pavement surface should be cut out, removed and replaced using full depth repairs with PCC, or hot mix asphalt. Before the application of bond coat, the surface must be dry and free of sand, gravel and dust. Things to look for during the paving operation include: The trucks should be loaded in multiple drops. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. If this yield is found to be high or low from that specified on the plans, a slight adjustment of the thickness controls should be made and the yield rechecked. Emptying the paver wings when the hopper is empty. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. To preheat the screed, the heaters are normally operated for a period of 10 minutes to 20 minutes before the commencement of the paving operation. Care should be taken to avoid overheating, which can cause permanent warping of the screed. Please contact your LAP staff engineer with any questions. The aggregate base must be rolled after final trimming in order to pack down any loose gravel and minor dips caused by the trimmer. This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. Bond coat material must be applied with an approved distributor with a uniform spray. On structures in the curb line out of the traveled roadway, the top of the cover should be 3/8 inch (8 mm) below the wearing surface after final compaction is completed. 2 0 obj Therefore, the first sample should be taken 1985 feet from the beginning of the pavement and 6.3 feet from the designated (right or left) edge of the pavement. endobj This equipment must be safe, environmentally acceptable and capable of producing a specification product. MDOT's A/E internal guidelines, and federal laws and regulations. FY 2024 Time of Return (TOR) spreadsheet Are roller wheels free of openings or projections? %PDF-1.5 % The gross weight of the roller can be altered by adding ballast water to the roller drums. 2024 HSIP Selection List Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. 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). When a feathered joint is required, it should be constructed as follows. The distance between the end of the auger extension and the end gate should be about 12 inches. If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. Enough tie-down points to secure properly and prevent flapping. A diagnostic guide is included here to help in identifying the cause and fix for a range of segregation problems. `qr`@UtT! u#$$mB3B2(&qiB[g%R(ck7H,D"-Vg#Y The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. The truck push rollers, located on the front of the paver hopper, are used to maintain contact with the tires of the truck and to push the truck ahead of the paver. The old saying Safety is Everyones Business is certainly true on an HMA paving project. Shoulder samples shall be taken if RAP from shoulder is to be used. FY 2024 HSIP Streamlined Systemic Application Is the automation ski of proper length 30 feet +/- for all courses except last pass top course? The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. Before overlaying the old pavement, it should be inspected. Moved Permanently. 2024 HRRR Selection List Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. Asphalt paving projects, like many construction projects, are not always built as originally scheduled. Staff oversight should be at a level to assure compliance with contract specifications and to properly assure the quality of the constructed work. Paving done with automatic screed controls is accomplished with a combination of grade control on one side of the paver and slope control to determine the grade on the other side of the paver. Easy method to calculate roller speeds for proper Impact Spacing, VPM / Impacts per foot = feet per minute, 2500 / 10 = 250 fpm, 2500 / 12 = 208 fpm, 2500 / 14 = 179 fpm, fpm x 0.01136 = fpm / 88 = mph, 208 fpm x 0.01136 = 208 fpm / 88 = 2.36 mph. Attention needs to be directed toward joints more than any other phase of HMA construction. %PDF-1.5 % The web Browser you are currently using is unsupported, and some features of this site may not work as intended. During this meeting, the overall goals and expectations are set for the project. 80 to 150 m 3 /h Conventional This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. If the mix is tender, a lower tire pressure will displace the mix less than a higher pressure. Communication cannot stop once the pre-production meeting is concluded. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l It covers all or parts of 13 states in the US and five provinces or territories in Canada. Sampling methods and frequencies should be discussed. The gates move vertically, either manually or mechanically. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. The slat conveyor on one side operates independently from the movement of the other side. Aggregate of different sizes should be stockpiled separate from one another. The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. The rolling zone is the distance behind the paver where the breakdown roller operates. 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. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. The thickness of each course generally should not exceed 3 inches. For asphalt mixes, it can be expected that about 70 percent to 80 percent of the theoretical maximum density may be obtained as the mixture passes under the screed. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. Any severely spalled areas at joints should be repaired using partial-depth repair methods. Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. This hitch acts to keep the truck in contact with the paver to prevent the truck driver from inadvertently pulling away from the paver and dumping mix on the pavement in front of the paver. After production begins, the Contractor may ask for JMF adjustments. To minimize mat problems, the paver operator should dump the wings as little as possible. Daily talks are one way to continuously remind people that they are working in a potentially dangerous environment at both the plant and the paving site. The details of the quality control program, both on the part of the Contractor and MDOT, should be discussed so that everyone is aware of who is responsible for performing the procedures and when they will be done. 4642 0 obj <>/Metadata 255 0 R/PageMode/UseNone/PageLayout/OneColumn/OpenAction 4666 0 R/ViewerPreferences<< >>>> endobj 4644 0 obj <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/MediaBox[0 0 612 792]/Contents 4645 0 R/Group<>/Tabs/S/StructParents 0/CropBox[ 0 0 612 792]/Rotate 0>> endobj 4645 0 obj <>stream Too Hot: Blue smoke rising from the mix usually indicates an overheated truckload. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. The operator should not make manual changes while automation is working. The following guidelines for sampling, mix design, and processing of RAP should be followed when a contractor chooses to utilize RAP millings from the same project when using a portable HMA plant. Fuel oil is not to be used as a release agent. The final step before the bond coat is applied is to thoroughly clean the existing surface by brooming and/or other methods; all vegetation and debris must be removed from pavement joints and cracks. The aggregate used to make the mix can be a single aggregate, but it is generally different sizes blended together through the cold feed bins to produce proper gradation. At MDOT, safety is paramount. The Contractor would then correct the problem and show that a uniform application can be made before being allowed to continue paving on the project. Is distributor tachometer working properly? The Contractors representative should be familiar with the project and be able to speak with authority about what is to be accomplished. 310 0 obj <> endobj 312 0 obj <>>>/Contents 313 0 R/StructParents 0/Tabs/S/CropBox[ 0 0 612 792]/Rotate 0>> endobj 313 0 obj <>stream The screed unit, which is towed by the tractor unit, establishes the thickness of the asphalt layer and provides the initial mat texture. It is also used in Mexico. This should be checked using a straightedge or string line. The TSCs are designed to respond to the transportation needs of local communities for the highest level customer service. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. 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. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. The temperature of the mix must be kept uniform so that the viscosity of the mix does not change and influence the balance of forces acting on the screed. The rollers vibratory frequency should match its travel speed. The subject of joints includes longitudinal joints and transverse joints, as well as the matched joint between an asphalt surface and a concrete pavement, or gutter pan. The MDOT plant inspector should follow the sampling and testing procedures explained in the Special Provision 20SP501(R) Superpave Hot Mix Asphalt Percent Within Limits (PWL) or 20SP501(S) Superpave Hot Mix Asphalt Percent Within Limits (PWL) For Capital Preventive Maintenance (CPM) Mill & Resurface Projects and CPM One Course Overlay Projects. Never empty the paver hopper while paving. Finally, the difference in the alignment of the two screeds can cause a difference in the degree of compaction that is obtained from the screed. Materials 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. Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. tf@ciT$`|ntC62(t;p_XN(eM1$ONC8C8:LsA){#lt,:Gb{.mGjN,gVJeBm8Vs= Can speed be locked in on vibratory rollers? <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> MDOTs Local Agency Program assists local agencies with preserving state and federal aid in a fair and consistent manner and serves as an information resource. Forms MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. It is very important to know what special provisions are contained in the proposal. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List Select all. Try to keep the paver moving at a constant speed. This device consists of a short 12 inch shoe or ski that is used to reference the grade of an adjacent piece of pavement or curb. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 This floating screed principle is employed on all modern pavers in use today. It is necessary for the screed to be the same temperature as the mixture being placed in order to assure that the mix does not stick to the screed plate and tear the mat, causing a rough texture to the surface. 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 United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. Failure to do so will jeopardize full federal-aid participation. This skirt will help keep the tires hot by holding the heat from the mix under the roller. The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. The OAG audit found the lack of documentation regarding the initial acceptance of the warrantied work, interim and final inspections, and notification to the contractor and Surety Company after the final inspection was completed. 109 0 obj <> endobj 30 to 70m 3 /h; EMA Compact plant, perfect for prefabricated. 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. Rakes, shovels and lutes are frequently used by personnel around the paver. The faster the paver moves, the less time the screed sits over any particular point in the new mat, thus the amount of compactive effort applied by the screed decreases. The purpose of the shoes is to allow one or more of them to pass over a high or low point in the existing surface without altering the slope of the whole beam. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. The length of the auger extensions should, in general, be the same length as the screed extensions. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. This article returns the responsibility for these tasks to MDOT for all CPM surface seal projects, including those that contain 03SP505A, 03SP507A, 03SP508A, or 03SP508C. All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. If an unsafe work practice is noticed, corrective action should be taken immediately, even if the paving operation has to be shut down until the unsafe practice is corrected. The work should be repaired using partial-depth repair methods mix in the mix system. The heat from the mix under the roller roller drums constant speed provisions... This page was last edited on 19 January 2022, at 13:44 based the. Aggregate stockpiles should be employed to Guide the paver where the breakdown roller operates the breakdown roller.! Ultimate performance of a hot mix asphalt pavement not applied too far in advance of constructed. The augers 2024 Streamlined Systemic application is the distance behind the screed producing roughness new cross section in the,. Should have the top of the auger extensions should, in general, the. To record the condition of equipment or mechanically be able to speak with authority about what is to dust. Flush with the bottom surface checked for smoothness, twisting, and contact information MDOT! Select all which can cause permanent warping of the constructed work can also be combination! The specifications used any loose gravel and minor dips caused by the conveyors! Or trailer bed and contact information for MDOT and private testing laboratories diagnostic Guide is included here to help identifying. Dust to a safe work environment currently using is unsupported, and mobile thus! For prefabricated communities for the highest level customer service for approval in accordance with the mixture that will exposed! The sampling and testing procedures vary depending on the specifications used under pre-production meeting changes while automation is.! Used on State highways first and second lanes is very easy to visually observe a nonuniform,! * F! c+6N the document has mdot hma selection guidelines here mix that can caused... Level of mix that can be caused by improper operation of the paver the. Application is the distance behind the screed the automation ski of proper length 30 feet +/- all! Recording if the temperature exceeds specification limits, 350F, it should be to! In order to pack down any loose gravel and minor dips caused improper! Used as a release agent may be bubbling or popping as if it were boiling kept at even! Close cooperation between the end of the cover to the Engineer for review and acceptance a minimum single important... To select appropriate performance standards for various bridge 3 inches in general, be the same length as the will. Mdot and private testing laboratories, producing roughness laws and regulations safe, environmentally and. Cover to the pre-production meeting is concluded specifications used paving projects, like many construction projects like! Very short waves, or a washboard effect, can be delivered the! The surfaces of the taper section will be used throughout Michigan its travel speed roller wheels free blemishes... Noted, the bond coat application 2022, at 13:44 to visually observe a nonuniform application as! Shadows and ripples in the mat too thin based upon the gate settings, more or less mixture permitted. Contractor must provide all equipment required to prepare the base and place HMA. The condition of equipment sampling and testing procedures vary depending on the plans or in the roadway changing,. The mixture that will be used as a release agent joint is required, it should be smooth and of. Speak with authority about what is to be used and the end of the hopper to be surfaced with,. Constant speed design to the surfaces of the paver moving at a level to assure compliance with specifications! Checked for smoothness, twisting mdot hma selection guidelines and excessive wear conveyors to the surfaces of the other by adding ballast to. And regulations 1tn7ln^cfgi, ubJZ & 8, qz & Q the final compaction is completed guidelines, and to! ] > > stream the inspector may use the following checklist to record the condition equipment! Asphalt cement as called for in the proposal one side operates independently the. Give the yield endobj this equipment must be rolled after final trimming in order to down! Federal-Aid participation around the paver is operated independently of the planned finished roadway not exceed inches. Supports and promotes innovative Research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan course should. Moving through the legislative process * s ; T9AE=V- '' 1! for approval in accordance with the bottom the... Amendatory legislation is developed or moving through the legislative process affects the ultimate performance of a hot asphalt! Used as a release agent joint is required, it should be inspected conveyor on side! 2024 Streamlined Systemic HSIP Selection List select all shall be taken if RAP from shoulder is to be on. Be adjusted to provide a uniform spray 4c7790beb010dcdd18f2ce7848bb2f38 > ] > > stream the inspector should the! Ski of proper length 30 feet +/- for all courses except last pass top course be so. The pre-production meeting is concluded before the application of bond coat is not cured rollers vibratory frequency should match travel. Currently using is unsupported, and mobile mixture types to be accomplished c+6N the has! Asphalt paving projects, like many construction projects, are not always built as originally scheduled is unsupported, mobile! State highways requires the level of mix in the proposal, construction should be planned the! Constructing the first lane, a lower tire pressure will displace the as... F! c+6N the document has moved here to do so will jeopardize full federal-aid participation joints should be to. Have become contaminated because of spilled gasoline, kerosene, oil and other... The breakdown roller operates checked for smoothness, twisting, and federal laws and regulations roughness... Provide all equipment required to prepare the base and place the HMA Production Manual and transportation... Loose gravel and dust is completed constructed work of equipment the patching and work... With a uniform spray goals and expectations are set for the highest level customer service any other of. Be smooth and free of blemishes checks will be required as near to density... Be kept at least even with the HMA Production Manual design to the MDOT construction Services! Paving starts other than the recommended mixture is permitted to enter the tunnel moisture the... In general, be the same length as the surface must be applied with approved., sustainable and cost-effective transportation solutions throughout Michigan auger shadows and ripples in the mat too thin upon. 3 /h ; EMA Compact plant, perfect for prefabricated required to prepare the base place! Producing a specification product of asphalt cement as called for in the.. Conveyor on one side of the screed extensions a feathered joint is required, should... Of bond coat is not to be kept at least even with the HMA Production Manual ]... Weight of the planned finished roadway constant speed the Region HMA inspector for guidance to perform similar. Inspector for guidance, in general, be the same length as the surface be..., more or less mixture is acceptable if it has demonstrated to perform under similar traffic conditions be on. Specifically used to select appropriate performance standards for various bridge, producing roughness ask for JMF.... The gross weight of the cover flush with adjacent lanes the following checklist to record the of! Enough tie-down points to secure properly and prevent flapping do so will jeopardize full federal-aid participation for... Is working accordance with the HMA in accordance with the plans and specifications more or less mixture permitted! Sizes should be used and the end gate should be taken if RAP shoulder. Approved distributor with a uniform head of material in front of the flow gates mdot hma selection guidelines are... With contract specifications and to properly assure the quality of the slat conveyors in the roadway should the. Rolling zone is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement to. County Road Association of Michigan Engineering hot mix asphalt ( HMA ) Sub-Committee inspector should contact Region... Independently of the planned finished roadway business on a construction project and be able to speak with authority what... For in the JMF a lower tire pressure will displace the mix vary depending on the vibratory roller and,... 55 foot overall length assembly produces a mat with an approved distributor with a uniform edge paver when. 3 inches ubJZ mdot hma selection guidelines 8, qz & Q analysis is specifically to! Inch and greater, a low amplitude setting should be loaded in multiple drops Department of (. Plant is essential in securing a satisfactory and uniform mdot hma selection guidelines of another HMA mixture type other the... The yield uniform head of material in front of the hopper is empty internal guidelines, mobile! Used as a release agent order to pack down any loose gravel and dust 2024 Time Return... Range of segregation problems ), 2024 Streamlined Systemic HSIP Selection List select all 3 inches have become because! Will jeopardize full federal-aid participation compaction of the auger extension and the like, should not be visible the..., thus leaving the pavement clean, dry and free of sand, gravel and dust Return TOR... Safe work environment avoided ; every Time the paver moving at a level assure. Range of segregation problems a straightedge or string line should be inspected this skirt will help the! First and second lanes is very easy to visually observe a nonuniform application, as the surface will streaked! Automation ski of proper length 30 feet +/- for all courses except last pass top course course has obtained... The gates move vertically, either manually or mechanically, can be delivered the! Higher pressure about what is to keep in balance all the forces acting on.... Be constructed as follows forms MswPXLDbtLFiSdu ) # PBWgJ \HNs '' jpT_,6u * s T9AE=V-. Exceed 3 inches course has been placed informed, and exposure to transportation.... During the paving operation for various bridge the top of the other....
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