There are, of course, limits to this. Common Safety Countermeasures for Local Agencies for Peds and Bikes MDOT's seven region offices each handle transportation-related construction, maintenance and programs within the region's geographic boundaries. Yield = 93920 pounds/561.33 square yards= 167.3 lbs/square yard. Depending on the material and job conditions, this can be quite dramatic. The patch shall be compacted so that the patch is smooth with adjacent pavement. Several different organizations publish short, concise safety presentations that can be completed in two to three minutes. Pressure distributors are used to apply a uniform application of the asphalt emulsions, normally referred to as the tack or bond coat. 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 very important to know what special provisions are contained in the proposal. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. 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}} . ECA Self-movable mobile plant. 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. 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. Joints in PCC pavement should be cleaned. It may be necessary to compact these areas by the hand tamper method. 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. This will happen on windy days and when the mat thickness is thin, normally the wearing course. 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. 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. Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. It is also used in Mexico. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Are the mats or wheel scrapers in good operating condition? FY 2022 LAP Bridge Scoping Estimate Key It is very easy to visually observe a nonuniform application, as the surface will look streaked. Care should be exercised to keep dust to a minimum. All the tires should be the same size, ply and tire pressure. Bond coat shall be applied to the taper before the adjacent lane is placed. 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. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. 2P3G(30120&gp9@. 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. Do pneumatic rollers have a min. The tiers identified below apply to Superpave The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. These adjustments should be completed within the first two loads placed. Testing Of Bituminous Mixtures (Vacuum Worksheet), Daily Report of Contractor's Quality Control Tests, Testing Of Bituminous Mixtures (Centrifuge Worksheet), Verification Testing of HMA Mixtures Marshall Density and Percent Air Voids, Report of Compacted Bituminous Mixture Core Density & Percent Compaction, Verification Testing Of HMA Mixtures Theoretical Maximum Density (TMD), Testing of Bituminous Mixtures Ignition Furnace Worksheet. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. All nozzles on the distributor should be open and functioning. Ideally, these meetings should occur at a regularly scheduled time and can be held on the project site, or at the asphalt plant. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. Old patches that show signs of instability, areas with excess asphalt, or excess crack filler, and areas with loose material should be removed and repaired. It can also be provided by the TMI. Do extensions have approved method of heating? 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. endstream endobj 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. 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. If the automatic controls are being used, the screed operator should not try to change the screed manually by turning the thickness control crank. In this instance, the two numbers chosen were: 0.376 and 0.529, for length and transverse offset. 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. 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. Resources for general work zone mobility guidelines for engineering and technical staff. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. 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 screed is equipped with heaters, the purpose of which is to increase the temperature of the cold bottom screed plate to about 320F (160C). PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. Are the vibrators on the screed operating properly? (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). documented in the HMA-QC Plan and discussed at the pre-production meeting. Section 1: Procedures Manual for HMA Mix Design Processing This section provides the mix design guidelines for Marshall and Superpave Hot Mix Asphalt mixtures for use on MDOT projects. 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. endstream endobj When rigid extensions are being used in conjunction with the main screed, the crown can usually be altered at any of the points where the extensions are joined. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities 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. %PDF-1.5 % Paver speed for various production and application rates can be calculated using the following equations or selected from Figure 502-5. A sublot is defined as 1 mile for this example of in-place 12 foot wide pavement. 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. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. 4641 0 obj <> endobj 309 0 obj <> endobj FY 2024 Time of Return (TOR) spreadsheet The method for determining the binder grade in HMA mixtures incorporating RAP and/or RAS is divided into three categories designated Tier 1, Tier 2 and Tier 3. These checklists do not replace or supersede the referenced MDOT, American . A pre-production meeting should be held before work commences on a project. Materials A new plant inspector can easily get burned if not aware that asphalt samples are very hot. See Figure 502-6. Secondary Route Bridge Design Plan Guides 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. 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