HMA types will be as specified on the plans or in the proposal. 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 Improper adjustments of catch basins can create drainage problems, which will lead to early deterioration of the roadway. Placing the mat too thin based upon the aggregate size. A pre-production meeting should be held before work commences on a project. Does the Contractor have proper number of rollers? Ensure mixture temperature is high enough for proper compaction. 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. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. Mountain Standard Time is the second westernmost time zone in the United States and Canada. Refer to Figure 502-13 for some typical mat appearances. Each type of reference can be used on either side of the paver, or on both sides at the same time. 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. The uniformity of the roller passes is just as important as the number of passes. This guidance takes effect as of August 29, 2016. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. The tiers identified below apply to Superpave 1 0 obj Any Judge violating such undertakings loses jurisdiction, resulting in his orders being VOID, and he himself commits a treasonable offense against the United States. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. If aggregates larger than what is required for mix design still exist after processing, the contractor must demonstrate that additional screens are installed on the RAP feed system to ensure that the RAP being introduced into the HMA mixture contains no aggregate larger than the top size aggregate allowed in the mix design. For a stiff mix, a higher tire pressure should be used. 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. 2023 HRRR Selection List, Highway Safety Manual (HSM) Process Failure to do so will jeopardize full federal-aid participation. 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. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. The asphalt cement delivery system must be calibrated. Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. This material can be neat, unmodified or modified with polymers, rubber, latex, etc. Every individual should know what is expected and know how to perform the assigned tasks. MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan This procedure will minimize the change in forces acting on the screed and will result in a near-constant mat thickness. 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. This will help ensure that sampling technicians for the project are formally qualified by the department. There should be enough trucks to provide a continuous flow of mix to the paver. 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. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. From 30 to 100 m 3 /h; MODULMIX Plant for large productions and special concretes. 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. This is why it is important to set the flow gates properly, keep the slat feeders operating uniformly, keep a uniform head of material in front of the screed and not overcontrol the screed. This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. See Figure 502-5 for paver speed based on yield and plant production rates. 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. The elevation of a fresh mat in relation to the base. See Figure 502-1. In the surface course, the entire affected area should be removed promptly and sufficient new material placed to form a true and even surface. Are roller wheels free of openings or projections? The tractor unit provides the motive power to the paver and to transfer the mixture from the receiving hopper on the front of the paver to the spreading augers at the back of the paver. 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. It is the Contractors responsibility to obtain the proper pavement density. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. 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. 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. Included are examples of calculations, documentation requirements, and . A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. Figure 502-16 shows an example of a coring documentation form. 2P3G(30120&gp9@. 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 Mixture temperature should be checked regularly when the mix arrives on the project and recorded on the load tickets. Pavement Type Selection Process; Ride Specification . Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. Laying out core locations, discuss how it will be done. When specified, special additives may be required. The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. 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. Several different organizations publish short, concise safety presentations that can be completed in two to three minutes. This principle allows the paver screed to average out changes in grade that are experienced by the tractor wheelbase. 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. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. Any severely spalled areas at joints should be repaired using partial-depth repair methods. Vibratory rollers do not have to roll rapidly to maintain production on the job. Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. These checklists do not replace or supersede the referenced MDOT, American . 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). 1918 provides That is why MDOT offers many ways to help ease the stress of commuting by providing information that commuters want and need as they make daily travel decisions. Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 The roller pattern should be set up as soon as paving starts. Maintain and document these certifications in the project files. Some pavements may be disintegrated so badly that the fragments may have to be removed. Paver speed for various production and application rates can be calculated using the following equations or selected from Figure 502-5. A list of equipment that will be used on the project should be supplied to MDOT. The tractor unit is powered by its own engine and provides the power to move the paver forward, either on rubber tires, or crawler tracks. The mix may also foam so that it appears to have too much asphalt. Once it is determined how many passes are needed to achieve compaction at any point, the roller pattern for an area will be calculated by multiplying the number of roller passes needed for compaction by the number of rollers needed to cover the width being paved. Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. Following the example below and accompanying Table 1, pick n numbers corresponding to the length of pavement, followed by picking n numbers for width determination. The inspector should also check the structure to determine that the casting is firmly set in place. Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. 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 Projects constructed under a warranty special provision still require inspection staffing and complete documentation prior to payment, including MDOT materials certifications, MDOT yield checks, MDOT quantity measurement, and MDOT Inspectors Daily Reports. Can speed be locked in on vibratory rollers? Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change 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. 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 batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). If the automatic controls are being used, the screed operator should not try to change the screed manually by turning the thickness control crank. Plan the width of application to ensure having bond coat under the matching longitudinal joint. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. Does the paver have two operating warning lights? Ensure the surface is cleaned of all dust, dirt and other debris. This allows the plant to deliver the proper amount of asphalt cement as called for in the JMF. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. 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. FY 2024 Safety (HSIP and HRRR) Call Letter The top course mixture can be used for wedging when the thickness is less than 2 inches. Each MDOT region has several Transportation Service Centers (TSCs) that are designed to respond to the transportation needs of local communities. 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. 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