The results of all daily and periodic tests conducted at the asphalt plant must be recorded on the appropriate MDOT form. Can VPM be locked in on vibratory rollers? These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. Short waves can be caused by a screed in poor mechanical condition, such as too much play in the screed control connections. However, the amount of overlap between the first and second lanes is very important. The sides, or wings, of the hopper are movable. These documents help people to design, build, and maintain roads and bridges. At MDOT, safety is paramount. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. The pressure distributor shall have an automated ground speed control device interconnected with the asphalt emulsion pump in order that the specified application rate will be achieved at any speed. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. It is generally impossible to roll these marks out once the mat cools. See Figure 502-7. Check the mixture thickness, or yield, within the first three truckloads. The dump bed should not hit the paver when dumped. The HMA mixture used for patching should be the top course mixture called for on the plans, or in the proposal. The Office of Communications works with the media to inform the public of MDOT's mission, policies and practices in a positive, consistent and credible manner. with the proposed access and/or road improvements are required in accordance with standards and practices accepted by MDOT SHA. 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. It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. 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. Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. Occupational Safety and Health Administration regulations must be known, understood and followed by each person involved on the project. This allows the paver operator to feed more or less mixture to either side of the paver. This arrangement can sense and correct any change in screed elevation. FY 2024 Safety (HSIP and HRRR) Call Letter This type of reference device is used only when the grade being sensed is relatively smooth. Any severely spalled areas at joints should be repaired using partial-depth repair methods. Risk analysis is specifically used to select appropriate performance standards for various bridge . When the paving operation is discontinued, a transverse joint must be constructed. Fat spots can be caused by high moisture in the mixture; if the mixture is very hot, asphalt could run down to the bottom of the truck during transport and cause fat spots when dumped into the paver. FY 2024 Time of Return (TOR) spreadsheet Advisories Fuel oil is not to be used as a release agent. Aggregate is generally sized by means of a screen deck into two to four of these hot bins. Whether you are from out of state or right here in Michigan, we want to ensure your travel throughout Michigan is informative, comfortable, and fun. endstream endobj As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. Another type of grade referencing device is the joint matching shoe. In the surface course, the entire affected area should be removed promptly and sufficient new material placed to form a true and even surface. What number and type of rollers were used? The degree of preparation depends upon the condition of the existing surface. See Figure 502-4. A mean average is thus obtained over the entire span. Material Quality. Please contact your LAP staff engineer with any questions. The desired degree of cross slope is dialed into the slope controller. Safety talks are a very good way to start each day for both the Contractor and MDOT personnel. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. ?,E_Bs>B~Ke?Ltqv`K?7GT=?e{T.gJu08!RmK?>\TG>X*zsK>C/>RXKG9>DOcpbcc?~JvGp_dfXq1]=K57:To dr>I7|IT3E?K8C.C i>Jspv0phJvpv@!C],U)BZ9**#"52pODGJ)E2A@oq )N-?Ihr>jcvM2}czL=NwX]QD;vu;djZkSLpX\w]>4t7~~}>kzr}^a{~cW/juWQ1fwH0?c:@ ^ ^ thI9#~wLH0]=.DEe4k;kR/_w\W]6xLK} 1Gp=azK%Ad/?t-[3)3x!Kyho6pkF1?Q!+]P#6Nt|ioF7K{O^j5[5U=uFh=tq-17|~%{knFic7'Fz]T^Ukkk}g[ L o.yhyKRr+a'oE. Design Before the application of bond coat, the surface must be dry and free of sand, gravel and dust. It spans from northern Canada to Mexico near the equator. The first is the frequency of vibration and the second is the amplitude of the compactive effort. Refer to the AASHTO Roadside Design Guide and the MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for additional . A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. The roller should not sit and wait on the hot mat. The first yield check should be made as soon as the Contractor has completed all paver adjustments. Project mixture and testing Special Provisions. 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. Does the paver have reverse pitch augers or paddles at center of paver? Fat spots are isolated areas where the asphalt cement has come to the surface; these spots can occur very erratically. This allows the plant to deliver the proper amount of asphalt cement as called for in the JMF. xc```b``rAb, B@ @_#Xf.m|yfx gnek%){Us8bm<=cy!M\I3K#b=3%K>[v._tR;yv1'007d`Xl l`1 ^AS40}iV_@xut4CIs2V2,ggtzkT+enF z"$wz These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. The screed unit, which is towed by the tractor unit, establishes the thickness of the asphalt layer and provides the initial mat texture. Is heating system in good working condition? If the millings have aggregates larger than what is required for the mix design, it should be processed (crushed and/or screened) prior to stockpiling*. Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. The MST time zone is the least populated time zone in the USA. A list of equipment that will be used on the project should be supplied to MDOT. The paver hopper must be at least half full at the time the wings are dumped. This equipment must be safe, environmentally acceptable and capable of producing a specification product. Does paver have properly working screed heaters? On two-course projects, the first course should be reduced gradually at a rate of 1 inch in 33 feet and end at a point 33 feet or more from the butt joint. 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. <>/Metadata 445 0 R/ViewerPreferences 446 0 R>> 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 111 0 obj <>stream Most mixtures will compact quite readily if spread uniformly and rolled at a temperature that assures proper asphalt binder viscosity. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. Paver speed is a large contributor to the smoothness of the ride on a finished pavement. In the event that an inspection is not completed prior to the expiration of the warranty, it is the departments responsibility to ensure that the inspection still takes place; however, this inspection should be completed only with MDOT forces. This equipment should be thoroughly checked before using it on the project. Vegetation and debris should be removed from joints and cracks. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. Not all of these tools are necessarily used on every project, or every day of a particular job. See Figure 502-5 for paver speed based on yield and plant production rates. 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. Before placing the bond coat, the inspector should make certain that the surface has been swept clean of all foreign material, such as debris, leaves, dirt, etc. All too often, the center of the lane receives adequate coverage, while the edges receive considerably less compactive effort. Interim and Final Inspection forms must be filled out even if there are no deficiencies and filed in ProjectWise. x\Yo~'08>0@SClr~PdZ`ZOUuwu.w9b?Q=3:|w/>_owW>}WO.@EsG}9='__?SyDSm[k}>0 ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC D The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. The bond coat material shall be applied ahead of the paving operation for a distance of at least 1500 feet, depending upon traffic conditions, as determined by the Engineer. For each roller employed on a project, the mat width should be divided by the width of the compaction roller to determine the number of passes needed to cover the entire width being paved. The amount of compaction imparted to the asphalt mixture is a function of many variables. Living Snow Fence, Fiscal Year Obligation Reports Hand tools, level, straightedge and boards. Document the extraction of the cores from the locations marked (random numbers, date, time, etc.). The tire surface must be kept hot to reduce the pick up of fines from the mixture being compacted. This process will be repeated for additional samples. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) It may be bubbling or popping as if it were boiling. Deviations in the pavement surface are averaged out over the length of the grade reference device. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. Certifications are good for one construction season only. Public Notice of Metro Region Bridge Council Meeting for September 28, 2022 FHWA Emergency Relief Program Video Roller Checklist - Manufacturer and Roller Number -______________________________________. Does the distributor have a capacity of at least 800gallons (3,000 liters)? The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. The density obtained by the paver screed is also a function of the speed of the paver. 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 These guidelines will be incorporated into the next version of the HMA Production Manual. 4641 0 obj <> endobj Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 The bond coat material must be applied with an approved distributor with a uniform spray. 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. Before the automatic screed controls are engaged, the screed must be nulled before paving starts and the proper angle of attack must be set. Phone: 443-572-5045 Fax: 410-787-0483 Email: TDavis5@mdot.maryland.gov Admixtures for Concrete Admixtures for Concrete Product Qualification Procedures (PDF, 200 KB) Qualified Products Air Entraining Agents (PDF, 200 KB) Drycast Admixtures (PDF, 200 KB) Precast Admixture (PDF, 200 KB) Type A - Water Reducing (PDF, 200 KB) HMA types will be as specified on the plans or in the proposal. After the paver placing the top course has passed over the structure and the hand raking and shaping have been completed, it may be necessary to compact this area by the hand tamper method. This continuous action of the slat conveyors and augers is accomplished by setting the proper position for the hopper flow gates and determining the correct speed setting for the slat conveyors and augers. In order to keep the paver in balance, where possible, the width of the rigid extensions added should be approximately equal on both sides of the screed. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. Adjust catch basins after the leveling course has been placed. In the longitudinal direction, the rollers should not stop at the same transverse end point with each pass of the roller; the reversal points should be staggered to prevent shoving of the mix. 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. The rolling zone should be kept as short as possible. Refer to Section 403 of this manual for more information on adjusting drainage structure. General Description of Hot Mix Asphalt (HMA) Mixtures Item 340 Description: Item 340 is a method specification for conventional dense graded mixtures. FY 2025 Local Bridge Program Call For Applications - Due April 2022 MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. This check is done by roughly measuring the area covered by one truckload; the tonnage placed is known from the load ticket. See Figure 502-1. No matter what type of plant is being used, several key items should be monitored. Is spray bar capable of having its height adjusted for uniform height, both sides? In addition, the screed imparts a level of compaction with the vibratory action of the screed. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. 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. 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. Common Safety Countermeasures for Local Agencies for Segments and Intersections Trying to reconstruct events at a later time without written notes and complete test data is usually frustrating and often results in conflicting opinions as to exactly what happened. Before overlaying an old HMA pavement, it should be inspected. 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. There are two basic types of asphalt mixing plants. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. Document when immediate possession of the extracted cores occurs (core ID, date, time, etc.). The haul trucks and all paving personnel must keep away from the line and not disturb it in any way. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. This material can be neat, unmodified or modified with polymers, rubber, latex, etc. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. I3 Q[LSP'@Df]]nt .Q1-^zAi"AN|.Tc Shoulder samples shall be taken if RAP from shoulder is to be used. Keep the level of mix at the augers as uniform as possible. 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. Refer to Figure 502-10. The aggregate base course must meet all the requirements for moisture content, density and smoothness. The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. 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. <> Profiling is used to establish a new cross section in the existing pavement. When the inspector sees an improper bond coat application, the operation should be stopped. FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 xc```f`` At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. endobj 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. Once the truck bed has been emptied of mix, the truck hitch is withdrawn and the truck is able to pull away from the paver. A result of specified mix contaminated with inferior performing, non-specification mix. The surfacing or construction traffic shall not be allowed on the existing pavement until the bond coat has cured. Staff oversight should be at a level to assure compliance with contract specifications and to properly assure the quality of the constructed work. The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. These guidelines provide for the selection of Hot Mixed Asphalt (HMA) and application rates utilizing the Superpave mix design system along with the Marshall Mix design system. The second unit is the paver screed. FY 2024 Webinar Recording Transportation Systems Management & Operations, Transportation and Civil Engineering Program, Transportation and Civil Engineering Internship, Transportation Diversity Recruitment Program, https://dev.michigan.local/som/json?sc_device=json, 2nd Street Bridge over Kalamazoo River in Allegan County, Maritime and Port Facility Assistance Office, National Summer Transportation Institute Program, Go to Transportation Systems Management & Operations, Go to Transportation and Civil Engineering Program, Go to Transportation and Civil Engineering Internship, Go to Youth Development & Mentoring Program, Go to Transportation Diversity Recruitment Program, Mackinac Straits Corridor Authority (MSCA), Transportation Asset Management Council (TAMC), Logistics & Supply Chain Collaboration (LSC), Instructions for Preparing to Bid Federal Aid Projects Through MDOT, Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bridge Area Staff Engineer Contact Information, Regional Bridge Councils Contact Information, Local Bridge Advisory Board Contact Information, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change, Public Notice of Bay Region Bridge Council Meeting for October 3, 2022, Public Notice of Grand Region Bridge Council Meeting for October 10, 2022, Public Notice of Metro Region Bridge Council Meeting for September 28, 2022, Public Notice of North Region Bridge Council Meeting for September 22, 2022, Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022, Public Notice of Superior Region Bridge Council Meeting for September 23, 2022, Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received, FY 2022 LAP Bridge Scoping Cost Estimate Worksheet, FY 2025 Local Bridge Program Call For Applications - Due April 2022, FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Asset Management Guide for Local Agency Bridges in Michigan, Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, TE Grant Applicant Roles/Responsibilities, FY 2024 Local Safety Program Applications Received, FY 2024 Safety (HSIP and HRRR) Call Letter, FY 2024 Electronic Application Submittal Form, FY 2024 HSIP Streamlined Systemic Application, Highway Safety Manual (HSM) Analysis Spreadsheet, 2024 Streamlined Systemic HSIP Selection List, 2023 Streamlined Systemic HSIP Selection List, ATSSA/NACE Low Cost Local Road Safety Solutions, Incorporating Safety into Resurfacing and Restoration Projects, Common Safety Countermeasures for Local Agencies for Segments and Intersections, Common Safety Countermeasures for Local Agencies for Peds and Bikes.