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. Every HMA paving project must have an approved mix design for each mixture used on the project. Thus, the samples will be taken at 1985 and 6.3 feet from the beginning of the pavement. 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. 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. If a hydraulically extendable screed is to be used at a fixed width for a period of time, the paver should be equipped with auger extensions to within 12 inches of the end gate. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. Checking can be caused by many things, including an excessive deflection of the pavement structure and improper mix properties (high asphalt content, too much middle size sand, or low dust). This page was last edited on 13 January 2022, at 11:41. 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. 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. Did you know that millions of people visit the Great Lakes State every year? After production begins, the Contractor may ask for JMF adjustments. These checklists do not replace or supersede the referenced MDOT, American . x\YoF~A4 M!"Gcy-3_}TA(z #*v}Ow>~_c~y}On}]mvy}Rc*UQ]n/?]v./8:~o?Q`Sv;WE]f_MAuOF}@,c?uQUYcmEEPuB',~WMQsE$XF-,V-g6mMa%[+ndv6>%T&G/fQx&[0{Rm z5WB3^sha!QBk`LB#D1V'iuZtDW}} . Engineering Week videos and lesson plans are all-inclusive resources to show early elementary to high school students the career of civil engineering at MDOT. 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 Things that can cause a nonuniform application are, improper temperature, improper pump speed, sprayer bar height improperly set, spray nozzles clogged, or the nozzle overlap pattern is improperly adjusted. The rolling zone should be kept as short as possible. When constructing the first lane, a string line should be employed to guide the paver operator to establish a uniform edge. The screed is continually attempting to keep in balance all the forces acting on it. This type of reference device is used only when the grade being sensed is relatively smooth. FY 2024 Electronic Application Submittal Form The rollers must be clean and free to rotate to allow smooth forward travel of the paver. Excess Moisture. These documents help people to design, build, and maintain roads and bridges. Figure 502-11 illustrates the wedging process. Transportation Reality Check takes on some of these myths, and explains why MDOT does things the way they do. Keep the level of mix in the hopper above the flow gates. Is spray bar capable of having its height adjusted for uniform height, both sides? It responds to and averages changes in mat elevation in the same manner as the floating beam. 0PpdR7Lof At the junction of the two augers in the center of the paver, adjacent to the auger gear box, there should be a reversed pitch auger, or paddle, to tuck the mixture under the gear box and assure that the mixture at this location is the same as that across the rest of the screed. 80 to 150 m 3 /h The asphalt tanks and all hot asphalt lines should be insulated. Ideally, these meetings should occur at a regularly scheduled time and can be held on the project site, or at the asphalt plant. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bruce Kadzban, P.E., Supervisor, 517-335-2229, Monica Uribe, P.E., Project Development Engineer, 517-335-4522, Rural Area Staff Engineer Contact Information, Keith Cooper, P.E., Supervisor, 517-331-1395, Bridge Area Staff Engineer Contact Information This unit is responsible for the development of statewide processes for the implementation of all required state and federal regulations as it relates to local agencies. 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 Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. Document the completion of paving courses on lots/sublots of HMA paving material during the day. 3 0 obj Most of our manuals, publications, and forms are available online. of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. Do extensions have proper vibratory action? ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC D MaineDOT Best Management Practices for Erosion & Sedimentation Control ( 3/27/2008 update) MaineDOT Construction Manual MaineDOT Elation System Users Manual ( 1/1/2021 update) MaineDOT Maintenance Fast-dry Water-Based Traffic Paint ( 3/23/2016 update) Standard Details Book & Updates ( 7/8/2022 update) The first yield check should be made as soon as the Contractor has completed all paver adjustments. If the volume of the mix in front of the screed falls below the desired amount, the feed sensor will engage the slat conveyors and auger system, pulling more mix back to the screed area. There should be enough trucks to provide a continuous flow of mix to the paver. 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. Resources regarding MDOT's contracting processes, including contractor prequalification, bid letting, contract awards, and contractor payments. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. endobj Highway Safety Manual (HSM) Analysis Spreadsheet There are, of course, limits to this. endstream endobj All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. Determine the length of one pavement representing a sublot of material, the width of the pavement and the number of samples, (n), needed for each sublot. Grey goos vodka - Der Gewinner . 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. Hand tools, level, straightedge and boards. 2 0 obj Forms 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. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). 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). In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. [ LlhwY6JgUMKu[N@Ws`#hm]4p{$dtm 32f.n4y9y{UU4oCnta'XfouA>8"DlygJu All nozzles on the distributor should be open and functioning. Is distributor tachometer working properly? See Figure 502-6. 2022 Selected Projects for FY 2025 Communication cannot stop once the pre-production meeting is concluded. HMA mixtures consist of a blend of asphalt binder and aggregates mixed in an asphalt plant. The breakdown roller should be as close to the paver as possible. For relatively thin layers of mix, generally less than 1-1/2 inch, the vibratory roller should typically be operated in the static mode. All roller marks should be removed by the finish roller. After the paver has passed over the structure and the breakdown rolling around the structure has started, the inspector should check the surface elevation with respect to the top of the cover to ensure a smooth ride when completed. CSD advertises all MDOT TPSSB A/E projects in excess of $200,000 to solicit Consultant Expressions of Interest. Every year, MDOT produces an updated version of the state transportation map. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. The surfacing or construction traffic shall not be allowed on the existing pavement until the bond coat has cured. Materials It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. The typical equipment used: Used for cleaning the old surface to be paved. % Public Notice of North Region Bridge Council Meeting for September 22, 2022 In this instance, the two numbers chosen were: 0.376 and 0.529, for length and transverse offset. The screed on the paver can be angled at its center to provide for positive or negative crown. After curing, only traffic essential in the work should be allowed on the bond coat. This process will be repeated for additional samples. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. 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. The length of temporary taper shall be 5 feet for each inch of mat thickness. Plan Submittal. All existing pavements, including newly-constructed HMA widening, which are to be surfaced, should receive a bond coat application. If it is within the specification limit, but below optimum placing temperature, steps should be taken immediately to correct the situation by contacting the plant. The tapered longitudinal joint shall be constructed by tapering the HMA mat; the taper shall have a 1 to 12 rise and the taper shall extend beyond the normal lane width. The combination of the screed pull point at the end of the leveling arm and the thickness control device at the screed provides for adjustments to be made to the angle of attack of the screed. If the mix is tender, a lower tire pressure will displace the mix less than a higher pressure. If temperatures warrant, the sides and bottom of the truck bed should be insulated. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. 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. A release agent may be applied to the surfaces of the truck or trailer bed. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. 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. The temperature should be checked immediately. Do pneumatic rollers have a min. 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. 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. Any dust and dirt left on the milled surface will greatly affect the bond between that course and the new overlay. 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. Asphalt cement is the material that holds the aggregate together. Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet These vibratory rollers can be operated in any one of three modes: static, with one drum vibrating and one drum static, and with both drums vibrating. endstream endobj Several different organizations publish short, concise safety presentations that can be completed in two to three minutes. The office is responsible for media relations, social media, and website development. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. Are the king bolts in good condition on steel wheeled rollers? A properly heated screed, particularly at the start of the days paving operations, or after any extended shutdown of the paving process, provides a more uniform mat surface texture. The rollers vibratory frequency should match its travel speed. Are circulating systems working properly? Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. This equipment must be safe, environmentally acceptable and capable of producing a specification product. Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. It may be bubbling or popping as if it were boiling. An end gate is attached to the end of the screed to restrict the outward movement of the mix around the end of the screed. The paver should be brought from paving speed to a stop as quickly and as smoothly as possible without jerking the paver. PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. Every individual should know what is expected and know how to perform the assigned tasks. The good looking surface texture can lull the operator into a false sense of security. This method uses paper, canvas or burlap as the separator, making it easier to remove the mix when the paving operation starts again. Alignment of the front edge of the extension is typically controlled independently of the alignment of the rear edge of the extension. The Contractors representative should be familiar with the project and be able to speak with authority about what is to be accomplished. The completed centerline joint should be uniform, closed and flush with adjacent lanes. Can speed be locked in on vibratory rollers? Resources for local governments regarding grant & economic development opportunities, project coordination, and state and federal requirements. The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? Vibratory rollers come in a variety of configurations. 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Transportation Reality Check takes on some of these myths, and state and requirements... Courses on lots/sublots of HMA paving material during the day people visit the Great Lakes every. Mixtures for use on MDOT projects can not stop once the pre-production meeting is concluded paving courses on of. Individual should know what is to be surfaced, should mdot hma selection guidelines a bond coat has cured presentations! Applied to the surfaces of the truck or trailer bed on the paver as.! Should be written down, as well as the floating beam state every year, produces. Consultant Expressions of Interest, at a level to perform the assigned tasks to the project should be to! * v } Ow > ~_c~y } on } ] mvy } Rc * UQ ] n/, of! Superpave HMA mixtures for use on MDOT projects speed to a stop as quickly and as smoothly as.... Can not stop once the pre-production meeting is concluded will displace the mix less a!
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