If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. %PDF-1.7 % Trim the joint at right angles to the roadway centerline. endstream endobj It can also be provided by the TMI. It responds to and averages changes in mat elevation in the same manner as the floating beam. Avoid spraying adjacent completed surfaces that will remain exposed. This is a certified product and the suppliers must be on the Certified Products List. Density is required across the full pavement width. The thickness of each course generally should not exceed 3 inches. Experience has shown that these sections generally settle after a short period of time. Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be thoroughly cleaned. PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. Is distributor tachometer working properly? 2024 HSIP Selection List Contract Plans Specify 165 pounds/square yard. The trucks should not be loaded by slowly driving forward while the mix is being delivered from the silo. The paver speed has a major effect on the forces acting on the screed. Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. Common Safety Countermeasures for Local Agencies for Peds and Bikes 2024 HRRR Selection List The uniformity of the roller passes is just as important as the number of passes. The Michigan Department of Transportation (MDOT) is responsible for Michigans nearly 10,000-mile state highway system, comprised of all M, I, and US-routes. Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 mdot hma selection guidelines - A process used in which HMA Production for specific HMA mixtures and HMA plants are limited to 400 to 1000 tonsrporation of FUSP 501BB, 501 FF, 501 GG, and 501 L. Changes made to Hot Mix Asphalt (HMA) Mixture Selection Guidelines in the Road Design Manual SP305A: HMA Base Crushing and Shaping: 3/27/2021: HMA . ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC D 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). Conventional This checklist may be placed in the project files. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. 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. Resources for the development of quality transportation project documents and services. General Description of Hot Mix Asphalt (HMA) Mixtures Item 340 Description: Item 340 is a method specification for conventional dense graded mixtures. The spray bar nozzles shall produce a uniform fan spray, and the shutoff shall be instantaneous, with no dripping. One of the greatest contributors to a poor ride on an urban project is the improper adjustment of manholes. Fat spots are isolated areas where the asphalt cement has come to the surface; these spots can occur very erratically. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Every individual should know what is expected and know how to perform the assigned tasks. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. Do all trucks have working backup warning systems? When cold-milling by the ton is a pay item, a weigh person will be needed. Rigid extensions come in several widths, usually 6 inch, 12 inch, 2, 3, and 5 foot sections. The tiers identified below apply to Superpave 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. A multi-unit culvert is considered a bridge if the total length, as measured along the centerline of the roadway, is greater than 20 feet and the distance between the culvert units is less than half the diameter of the smallest unit. 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. Another type of grade referencing device is the joint matching shoe. Cutoff shoes can be used, if necessary, to reduce the width of mixture being placed to a width that is less than the basic main screed width. It is important for the screed extension to be attached securely to the main screed. These defects can be divided into two primary categories: equipment related and mixture related. Large enough to cover the top of the load and extend over sides and tailgate. USDOT Navigator Website. The gates move vertically, either manually or mechanically. [v2pBT9V9Y$Zq[Uh q91Ok6b dES 0k$#ti@o8pj#da*4mq9ZZz3WKI!VNTPkpcZ` The amount bid for HMA may be adjusted. The inspector should also check the structure to determine that the casting is firmly set in place. 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. Transportation Grant Programs, Letting Process, Local vs. MDOT for Enhancement Projects, Heidi Spangler, Safety Engineer, 517-230-4605, FY 2024 Local Safety Program Applications Received The aggregates are then proportioned by weight into the mixer, also called the pug mill. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. 309 0 obj <> endobj This material can be neat, unmodified or modified with polymers, rubber, latex, etc. All mixtures specified for a project must have an approved mixture design before mix production can proceed. %PDF-1.5 % Are the vibrators on the screed operating properly? In Michigan, there are three publicly-owned and operated bridges: Mackinac Bridge, Blue Water Bridge, and International Bridge. Check the mixture thickness, or yield, within the first three truckloads. After curing, only traffic essential in the work should be allowed on the bond coat. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. The auger on each side of the paver is operated independently of the other. 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. The paver hopper is used to receive and temporarily hold the mixture from the trucks. B. 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. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. Transverse joints not being properly constructed. Joints that are poorly sealed should have the old seal material removed and the joints cleaned. Public Notice of North Region Bridge Council Meeting for September 22, 2022 MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. . Most mixtures will compact quite readily if spread uniformly and rolled at a temperature that assures proper asphalt binder viscosity. The results of all daily and periodic tests conducted at the asphalt plant must be recorded on the appropriate MDOT form. (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). The web Browser you are currently using is unsupported, and some features of this site may not work as intended. FY 2022 Project Planning Guide If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. 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. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. Multiple drops of the mix are necessary. Ensure the bond coat has broken before paving starts. FY 2024 Electronic Application Submittal Form *If approved by the engineer, in line crushing and/or screening will be allowed in lieu of processing RAP into a stockpile. Common Safety Countermeasures for Local Agencies for Segments and Intersections 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 document has moved here. Irregularities in the lower courses can usually be corrected by removing or adding material. 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. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. These guidelines will be incorporated into the next version of the HMA Production Manual. Figure 502-11 illustrates the wedging process. Further, whenever rigid extensions are employed, the strike off, or pre-strike off, assembly must be added to the extension and set at the same location as the strike off on the main screed. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. All nozzles should be turned at the same angle to the spray bar: approximately 30 degrees, depending upon the manufacturers recommendations. Field experience and test data have shown that a vibratory compactor will produce required density in fewer passes than a static roller, while moving at a slower speed. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. This procedure will minimize the change in forces acting on the screed and will result in a near-constant mat thickness. Open texture areas in the joint should be filled using the HMA mixture with the large stones removed. Mesgana Ayele Assistant Division Chief, Materials Management Division - Materials Management Systems MDOT SHA Office of Materials Technology 7450 Traffic Drive Hanover, Maryland 21076 Office: 443-572-5021 Toll Free: 1-866-926-8501 MAyele@mdot.maryland.gov 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. 80 to 150 m 3 /h 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. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. The roller pattern should be set up as soon as paving starts. 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