Be in good condition with no holes or tears. After a short mixing process, the asphalt cement is added and the entire mixture is mixed for 30 to 45 seconds. This is a certified product and the suppliers must be on the Certified Products List. Although there are several ways to construct this joint, the most common is the ramp joint. The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. The degree of preparation depends upon the condition of the existing surface. 111 0 obj <>stream Pavement Type Selection Process; Ride Specification . Transverse joints not being properly constructed. Document the extraction of the cores from the locations marked (random numbers, date, time, etc.). Bond coat material must be applied with an approved distributor with a uniform spray. There are four basic types of grade references that can be employed to maintain the elevation of the screed pull point: the erected string line, the mobile mat reference, 30 foot floating ski, and the joint matching shoe. The mat reference beam is spring supported on a series of wheels that roll on the mat. Are the king bolts in good condition on steel wheeled rollers? Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. 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. These guidelines have been reviewed and approved by the County Road Association of Michigan (CRA) Engineering Committee, and concurred with by Federal Highway Administration (FHWA) Michigan Section, and MDOT. These trucks are loaded in the same manner directly from the silo at the plant. It is also possible to require the Contractor to remove a sublot of leveling course mixture that has already had the top course mixture placed upon it. The paint dot is to be visible on the core during handling and testing. FY 2022 LAP Bridge Scoping Estimate Key No raking of the joint is needed. 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. This type of reference device is used only when the grade being sensed is relatively smooth. This nonuniform texture can be caused by many factors: screed extensions not level with each other, running the hopper empty between trucks, unevenly worn screeds, cold mix, or improperly emptying the paver wings. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. 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. FY 2024 Time of Return (TOR) spreadsheet FY 2025 Local Bridge Program Call For Applications - Due April 2022 Resources for MDOT real estate standards, policies and procedures, and training. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. The rollers vibratory frequency should match its travel speed. This is helpful at lane tapers, crown corrections, or in areas of wedging. The length of temporary taper shall be 5 feet for each inch of mat thickness. Paver speed is a large contributor to the smoothness of the ride on a finished pavement. 4 0 obj Moreover, if one roller rotates freely and the other does not, the paver may tend to change direction. MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan The discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. Trucks should stop short of the paver and be picked up by the paver. 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. Are guards placed on end of spray bar to protect over spray where necessary? Welche Kriterien es vor dem Kaufen die Nici qid zu untersuchen gibt! See Figure 502-12. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. During this meeting, the overall goals and expectations are set for the project. 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. As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. This will help ensure that sampling technicians for the project are formally qualified by the department. Adjustments to the JMF will not be allowed outside the mixture limits shown in Tables 501-1 and 501-2 of the Standard Specifications for Construction. Requesting a ProjectWise Folder, Ryan Doyle, P.E., Supervisor, 989-220-9447, Michele Zawerucha, Project Development Engineer, 517-335-0878, Urban Area Staff Engineer Contact Information, Instructions for Preparing to Bid Federal Aid Projects Through MDOT Plan Approval. This equipment must be safe, environmentally acceptable and capable of producing a specification product. 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. The surfacing or construction traffic shall not be allowed on the existing pavement until the bond coat has cured. 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. 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 temperature should be checked immediately. Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022 ?,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. At the bottom of the paver hopper is a set of slat conveyors. See Figure 502-7. This will happen on windy days and when the mat thickness is thin, normally the wearing course. Material Quality - Resources; Material Quality Partnering Meetings. Transverse screed marks are transverse indentations in the mat, which may occur when the paver stops between truckloads. 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. 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. The inspector should contact the Region HMA inspector for guidance. Try to keep the paver moving at a constant speed. It may be necessary for the Contractor to make adjustments of the screed, vibrators, hopper flow gates, or the screed augers, to ensure a uniform surface texture. Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. This point is called the tow or pull point. Rough, uneven surfaces should be leveled. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities Forms The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. Before overlaying an old HMA pavement, it should be inspected. Forms Refer to Figure 502-13 for some typical mat appearances. endstream endobj This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. 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. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. Living Snow Fence, Fiscal Year Obligation Reports In the surface course, the entire affected area should be removed promptly and sufficient new material placed to form a true and even surface. 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. x\Yo~'08>0@SClr~PdZ`ZOUuwu.w9b?Q=3:|w/>_owW>}WO.@EsG}9='__?SyDSm[k}>0 The inspector should ensure that the Contractor is not causing damage to the mat during the compaction process, such as heat checking or cracking stone (white surface appearance). Samples shall be taken if visual observations show significant variations in existing pavement mat. See Figure 502-2. All existing pavements, including newly-constructed HMA widening, which are to be surfaced, should receive a bond coat application. The typical equipment used: Used for cleaning the old surface to be paved. Our goal is to keep Michigan's motorists safe, informed, and mobile. Alignment of the front edge of the extension is typically controlled independently of the alignment of the rear edge of the extension. Selection of appropriate pavement marking materials (paint, thermoplastic . Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. The screed extensions should be level with the main screed. Did the paver have to stop and wait for trucks? Loads that have become contaminated because of spilled gasoline, kerosene, oil and the like, should not be used in the roadway. Ensure the paver speed matches mixture delivery. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. 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. Ensure sufficient compaction capacity is available. The tiers identified below apply to Superpave At the time of the periodic on-site inspection, complete the following tasks: In addition, do not make payment until the measured quantities are checked for correlation to the contractors submitted material certifications/tickets and yield calculations. 1 0 obj This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. Roller passes must be distributed uniformly over the width and length of the area being compacted. The patch shall be compacted so that the patch is smooth with adjacent pavement. It can be configured for automatic grade and slope, or dual grade control, as shown in Figure 502-8. If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. 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 Contract Plans Specify 165 pounds/square yard. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. B. 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 inspector should check the entire pavement surface to ensure that all corrections are made before resurfacing work begins. It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 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. CSD advertises all MDOT TPSSB A/E projects in excess of $200,000 to solicit Consultant Expressions of Interest. Drum mixers come in many different types, such as parallel flow, counter flow, double barrel, drum-within-a-drum and drums with separate mixing chambers (Figure 501-4). It covers all or parts of 13 states in the US and five provinces or territories in Canada. ]Rt~cv!G(F5@QFJFIN$@>, Never empty the paver hopper while paving. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. {7:r!> -)t=:NuL5oqba5q]oe`0jC This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. A paving schedule for the project should be presented and discussed with MDOT. Unsere Bestenliste Jan/2023 Detaillierter Produktratgeber TOP Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen. Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. The rollers behind the first paver should stay 1 foot away from the free edge toward the second paver. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. When the paving operation is discontinued, a transverse joint must be constructed. This arrangement can sense and correct any change in screed elevation. The top size of the top scalping screen shall be 1.5 for top and leveling courses and 2 for base courses. The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). 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. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. Emptying the paver wings when the hopper is empty. 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. Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. Mixture temperature should be checked regularly when the mix arrives on the project and recorded on the load tickets. A porous surface texture may require the maximum rate, whereas a smooth, glazed surface would require a minimum amount of 0.05 gallons/square yards. This should be checked using a straightedge or string line. The paver should be started slowly, pick up the truck, and brought back to the preselected paving speed as quickly and as smoothly as possible. Conventional The uniform application of the emulsion is a function of the asphalt distributor and the skill of the operator. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. 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. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. When one truck is emptied, it should pull away from the paver. Another type of grade referencing device is the joint matching shoe. The certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. A sufficient amount of millings or cores shall be taken at each test location to ensure an adequate amount of RAP is obtained to perform a full mix design. 2024 HSIP Selection List The screed unit, which is towed by the tractor unit, establishes the thickness of the asphalt layer and provides the initial mat texture. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. 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. (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). For vibratory rollers, the following can be controlled by the operator: vibration frequency, vibration amplitude and direction of travel, when frequency and amplitude are engaged according to the manufacturers recommendations. It is also used in Mexico. Asphalt paving projects, like many construction projects, are not always built as originally scheduled. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. Materials 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. The people most likely to be hurt on an asphalt paving project are those individuals who are new to this type of work. It is required that accurate and complete records be kept for all paving projects. See Figure 502-5 for paver speed based on yield and plant production rates. If automation is required, ensure its on and working. The Contractor will use several types of rollers and each type is used for different purposes. It is the Contractors responsibility to provide quality control necessary to produce the mixture uniformly, within the limits specified in 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. The paver should be brought from paving speed to a stop as quickly and as smoothly as possible without jerking the paver. 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. Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. 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. In Michigan, there are three publicly-owned and operated bridges: Mackinac Bridge, Blue Water Bridge, and International Bridge. The rolling zone is the distance behind the paver where the breakdown roller operates. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. This allows the paver operator to feed more or less mixture to either side of the paver. Some pavements may be disintegrated so badly that the fragments may have to be removed. 2022 Selected Projects for FY 2025 The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. Ensure the bond coat has been applied uniformly at the proper yield. 311 0 obj <>stream Obviously the higher the frequency, the faster the vibratory compactor may roll. See Figure 502-6. Before the automatic screed controls are engaged, the screed must be nulled before paving starts and the proper angle of attack must be set. Keeping the hopper at least half full between truckloads of mix keeps the head of mix in front of the screed constant and this will reduce mat problems. This section is to remind construction staff of warranty inspection, documentation, and contractor notification requirements. Figure 502-11 illustrates the wedging process. All the tires should be the same size, ply and tire pressure. Can VPM be locked in on vibratory rollers? In addition to the longitudinal mark, a mismatch in the elevation between the two screeds can also result in a possible difference in surface texture. 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. Once the pavement has dried, multiple passes of a mechanical broom are needed to remove all the residual grit from the milled surface. This checklist may be placed in the project files. Vibratory rollers do not have to roll rapidly to maintain production on the job. This document replaces the previous edition of the guidance, published in 2009. There are three types of mat tearing, or pulling, of the asphalt mix, and each is described by the location of the tear: in the center of the lane, at the outside edges of the lane, or full width. A random number generating computer program smoothness of the operator on a finished pavement limits shown in Tables 501-1 501-2! 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