mdot hma selection guidelines

Short waves can be caused by a screed in poor mechanical condition, such as too much play in the screed control connections. A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. Providing the highest quality integrated transportation services for economic benefit and improved quality of life. <> ~zWRGO#wnpOs1`(yvM>.D>N^-E*na71K7L.E5! Adjust catch basins after the leveling course has been placed. The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. The insulation should be tight against the body of the bed; there should be no gaps between the side of the truck and the insulation through which air could move. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. of seven wheels? This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. 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. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. Grey goos vodka - Der Gewinner . The screed extensions should be level with the main screed. At MDOT, safety is paramount. The aggregate base course must meet all the requirements for moisture content, density and smoothness. 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. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. This type of reference device is used only when the grade being sensed is relatively smooth. All the tires should be the same size, ply and tire pressure. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. Saturated areas must be allowed to dry prior to placing mixture. When the inspector sees an improper bond coat application, the operation should be stopped. The office is responsible for media relations, social media, and website development. This floating screed principle is employed on all modern pavers in use today. Hand raking and shaping around the cover must be completed before the material cools. 1918 provides After curing, only traffic essential in the work should be allowed on the bond coat. 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. If required, the truck bed should be insulated. The top course mixture can be used for wedging when the thickness is less than 2 inches. The paver consists of two primary parts, the tractor unit and the screed unit. Highway Safety Manual (HSM) Analysis Spreadsheet Plants are certified in accordance with the HMA Production Manual. When a feathered joint is required, it should be constructed as follows. 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. endstream endobj When the paving operation is discontinued, a transverse joint must be constructed. 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream 109 0 obj <> endobj Ensure the bond coat has been applied uniformly at the proper yield. The asphalt cement delivery system must be calibrated. Rocking slabs must be stabilized. Does the paver have reverse pitch augers or paddles at center of paver? 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 Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. 4649 0 obj <]>>stream PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. Rough, uneven surfaces should be leveled. The temperature of the mix must be kept uniform so that the viscosity of the mix does not change and influence the balance of forces acting on the screed. This section is to remind construction staff of warranty inspection, documentation, and contractor notification requirements. 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. Welche Kriterien es vor dem Kaufen die Nici qid zu untersuchen gibt! *If approved by the engineer, in line crushing and/or screening will be allowed in lieu of processing RAP into a stockpile. FY 2024 Time of Return (TOR) spreadsheet See Figure 502-7. The tire surface must be kept hot to reduce the pick up of fines from the mixture being compacted. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. Before overlaying the old pavement, it should be inspected. 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. Stopping the paver and allowing the screed to settle into the mat. Refer to Figure 502-13 for some typical mat appearances. Incorporating Safety into Resurfacing and Restoration Projects %PDF-1.5 % Resources for local governments regarding grant & economic development opportunities, project coordination, and state and federal requirements. All nozzles on the distributor should be open and functioning. The paver should be brought from paving speed to a stop as quickly and as smoothly as possible without jerking the paver. This is a certified product and the suppliers must be on the Certified Products List. It responds to and averages changes in mat elevation in the same manner as the floating beam. If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. The slope control operates through a slope sensor that is located on a cross beam between the two side arms on the screed. Contract Plans Specify 165 pounds/square yard. 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. 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. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. Loads that have become contaminated because of spilled gasoline, kerosene, oil and the like, should not be used in the roadway. Be in good condition with no holes or tears. 4641 0 obj <> endobj These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. Mountain Standard Time is the second westernmost time zone in the United States and Canada. Any severely distressed areas in the old rigid pavement surface should be cut out, removed and replaced using full depth repairs with PCC, or hot mix asphalt. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. Alignment of the front edge of the extension is typically controlled independently of the alignment of the rear edge of the extension. The first yield check should be made as soon as the Contractor has completed all paver adjustments. Is distributor tachometer working properly? The gross weight of the roller can be altered by adding ballast water to the roller drums. On structures in the curb line out of the traveled roadway, the top of the cover should be 3/8 inch (8 mm) below the wearing surface after final compaction is completed. There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. In this instance, the two numbers chosen were: 0.376 and 0.529, for length and transverse offset. Each type of reference can be used on either side of the paver, or on both sides at the same time. Obviously the higher the frequency, the faster the vibratory compactor may roll. There are many common myths and misconceptions about transportation in Michigan. 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. A result of specified mix contaminated with inferior performing, non-specification mix. Plan Submittal. This allows the paver operator to feed more or less mixture to either side of the paver. 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. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. At a minimum, the failed areas should be removed and replaced, the potholes properly patched, the cracks cleaned out and the ruts filled, or preferably removed by cold-milling. endstream endobj 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. The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? Selection. Ensure existing surface failures are repaired properly. Do pneumatic rollers have a min. There are two basic types of asphalt mixing plants. 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. This will help ensure that sampling technicians for the project are formally qualified by the department. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. Excess Moisture. This article returns the responsibility for these tasks to MDOT for all HMA paving projects, including those that contain special provisions 03SP502D and/or 03SP502E. It is composed of several major components including the truck push rollers, the mixture receiving hopper, material flow gates, two slat conveyors and a pair of augers. Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. After production begins, the Contractor may ask for JMF adjustments. Final Report Part 3 The temperature should be checked immediately. It is also the responsibility of MDOT and the Contractor to discuss any unusual aspects of the project, items that are not routine construction practices. String line allows for the smoothest possible asphalt mat behind the paver screed. The work should be planned so the bond coat is not applied too far in advance of the paving operation. Although there are several ways to construct this joint, the most common is the ramp joint. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. No paving shall occur using RAP from the project until a mix design is approved. Multiple drops of the mix are necessary. 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. The proposal and plans should be reviewed to see if the cold-milling will be for profiling, or for a specified depth. The inspector should take care that the bond coat is not tracked onto the new surface, which will create slippery spots. It is important for the screed extension to be attached securely to the main screed. Additionally, a 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request. The Local Agency Programs (LAP) Unit administers the local allocation of federal and state aid programs (Urban, Rural, Bridge, Enhancement, Economic Development, and Special Appropriations). 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. However, if the project does not call for HMA mixtures, or the patching is in advance of the paving operation, any mixture readily available and approved by the Engineer can be used. The initial acceptance form, contained in the contract documents, is to be filled out when the warrantied work has been completed and accepted. When one truck is emptied, it should pull away from the paver. Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. Public Notice of Superior Region Bridge Council Meeting for September 23, 2022 The other type adds the asphalt cement and RAP in a separate mixing chamber out of direct contact with the burner flame. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. Large enough to cover the top of the load and extend over sides and tailgate. What number and type of rollers were used? A mean average is thus obtained over the entire span. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. 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. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. Material Quality. This information must be detailed and complete. Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. Samples to be taken a minimum of every mile in each lane by milling or coring. Asphalt cement is the material that holds the aggregate together. Another type of grade referencing device is the joint matching shoe. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. Bleeding (flushing) occurs when the asphalt cement comes to the surface under traffic. In addition, the spray bar should be set at the proper height above the pavement surface to provide for a double or triple lap of the liquid asphalt materials. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l Because of its short length, the joint matching shoe will not remove any major variations that occur in the existing surface, or adjacent paved lane. Refer to the AASHTO Roadside Design Guide and the MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for additional . This page was last edited on 13 January 2022, at 11:41. Communication cannot stop once the pre-production meeting is concluded. For the floating screed principle to work properly, it is important that the pull points on both sides of the tractor be at the same level above the ground. The rollers vibratory frequency should match its travel speed. . A notch of up to 1 inch shall be placed at the top of the taper when placing HMA. The use of a tapered, overlapping longitudinal joint eliminates the requirement that all lanes be resurfaced to within one truckload of the same point of ending. Did you know that millions of people visit the Great Lakes State every year? See Figure 502-6. 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. Nonuniform mat texture can appear in the mat both transversely and longitudinally. Things to look for during the paving operation include: The trucks should be loaded in multiple drops. Resources for specialized engineering and technical support for construction staff across Michigan. This article returns the responsibility for these tasks to MDOT for all concrete paving projects, including those that contain special provisions 03SP602A and/or 03SP602E. It is important that the augers carry a consistent amount of mix across the front of the screed so that the pressure on the screed is kept as constant as possible. Bond coats may be considered cured when your shoes tend to stick without picking up material when walking over it. This leveling device is attached to the tractor unit at only one point on each side of the paver; it is able to float on the asphalt mixture and to provide initial mat texture and compaction to the material as it passes under it. To minimize mat problems, the paver operator should dump the wings as little as possible. The importance of staying within the surface tolerance for smoothness cannot be overemphasized. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. 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 batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). If a hydraulically extendable screed is being used with the paver, the crown can be introduced in the center of the main screed and also at the points between the main screed and the hydraulic extensions. Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022
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