Not all of these tools are necessarily used on every project, or every day of a particular job. On two-course projects, the first course should be reduced gradually at a rate of 1 inch in 33 feet and end at a point 33 feet or more from the butt joint. 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. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
All personnel involved in the project must be required to comply with all safety standards applicable to the type of construction and asphalt paving work to be carried out. The auger on each side of the paver is operated independently of the other. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. 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. These devices are used to carry the mixture from the hopper through the paver tunnel to the back of the paver and the spreading augers. Final Report Part 3 Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. After production begins, the Contractor may ask for JMF adjustments. The uniformity of the roller passes is just as important as the number of passes. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. Before overlaying an old HMA pavement, it should be inspected. Never empty the paver hopper while paving. 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. Thus, the amount of mixture that can be carried back to the augers on one side can be different from the other side. The augers must be extended if the screed is extended. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. Ensure the bond coat has broken before paving starts. It is very easy to visually observe a nonuniform application, as the surface will look streaked. Risk analysis is specifically used to select appropriate performance standards for various bridge . 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 primary compaction variables that can be controlled during the rolling process are: number of rollers, type of rollers, roller speed, number of roller passes and roller pattern. x DH,YZ`XUNC9*F !c+6N
Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. The people most likely to be hurt on an asphalt paving project are those individuals who are new to this type of work. The work should be planned so the bond coat is not applied too far in advance of the paving operation. All the tires should be the same size, ply and tire pressure. This equipment should be thoroughly checked before using it on the project. Public Notice of Superior Region Bridge Council Meeting for September 23, 2022 Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. While the paver is operating, laborers may work, or rework, a portion of the mix to fit the paving around objects and to fill in areas that the paver does not pave adequately, or cannot reach. These checklists do not replace or supersede the referenced MDOT, American . See Figure 502-1. The surface can have two types of waves: long waves and short waves. Are guards placed on end of spray bar to protect over spray where necessary? Proper subsurface drainage should be installed as necessary. To minimize mat problems, the paver operator should dump the wings as little as possible. Before the application of bond coat, the surface must be dry and free of sand, gravel and dust. Once the proper yield has been obtained, only periodic checks will be required each day. For vibratory rollers, the following can be controlled by the operator: vibration frequency, vibration amplitude and direction of travel, when frequency and amplitude are engaged according to the manufacturers recommendations. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. 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. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. 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. 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. Road Safety Audit 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 inspector should check the placement yield occasionally. The screed on the paver can be angled at its center to provide for positive or negative crown. 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. Ensure the surface is cleaned of all dust, dirt and other debris. Paving done with automatic screed controls is accomplished with a combination of grade control on one side of the paver and slope control to determine the grade on the other side of the paver. To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. If the end of the lane is to be left open overnight, a ramp joint should be used. The inspector may use the following checklist to record the condition of equipment. These adjustments should be completed within the first two loads placed. Laying out core locations, discuss how it will be done. Every year, MDOT produces an updated version of the state transportation map. Pressure distributors are used to apply a uniform application of the asphalt emulsions, normally referred to as the tack or bond coat. Are circulating systems working properly? The document has moved here. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). The asphalt cement in the storage tanks should be kept at a constant temperature, normally between 275F and 311F . I3 Q[LSP'@Df]]nt .Q1-^zAi"AN|.Tc USDOT Navigator Website. 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. If it exceeds optimum placement temperature, but does not exceed the specification limit, the truckload is usually not discarded, but immediate steps should be taken to correct the condition. These averages are combined and measured at the grade sensor near the screed tow point. Mixture, if left to stand for a long time in the corners of the hopper, will cool. The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. The auger and the slat conveyor on the same side must be operated together. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. Be in good condition with no holes or tears. Aggregate of different sizes should be stockpiled separate from one another. Do extensions have proper vibratory action? FY 2022 Project Planning Guide Stopping the paver and allowing the screed to settle into the mat. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. 2 0 obj
These guidelines will be incorporated into the next version of the HMA Production Manual. These tools include rakes, shovels, lutes, 10 foot straightedge, carpenters level and blocks and shims for supporting the screed of the paver when beginning operations at a butt joint. However, the amount of overlap between the first and second lanes is very important. Slow and steady is the key to good vibratory compaction procedures. If automation is required, ensure its on and working. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet The tire pressure used depends, in part, upon the number of plies used in the tires. This minimum rate should also be used between courses as a tack coat. 109 0 obj
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Does the paver have two operating warning lights? 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. The screed is attached to the tractor unit at only one point on each side of the paver. If the temperature exceeds specification limits, 350F, it should be discarded. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. 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. 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. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. The first yield check should be made as soon as the Contractor has completed all paver adjustments. Density is required across the full pavement width. 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 field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). Are the king bolts in good condition on steel wheeled rollers? Rollers can also be a combination of both pneumatic and steel wheel. This is helpful at lane tapers, crown corrections, or in areas of wedging. 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. Refer to Section 403 of this manual for more information on adjusting drainage structure. The rolling zone should be kept as short as possible. To convert the yield to mat thickness, the following will be helpful: 110 pounds/square yard = 1 inch of thickness. 2P3G(30120&gp9@. endobj
The aggregate base must be rolled after final trimming in order to pack down any loose gravel and minor dips caused by the trimmer. Shoulder samples shall be taken if RAP from shoulder is to be used. Stop the paver at this point, remove it from the roadway and remove any excess HMA material from the roadway. 115 0 obj
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FY 2024 Safety (HSIP and HRRR) Call Letter The TRAC Internship is an extension of the TRAC Program and is designed to provide opportunities for 12th grade students interested in transportation and engineering careers. The aggregate base course must meet all the requirements for moisture content, density and smoothness. Once this has been done, complete the rolling of the joint. FY 2022 LAP Bridge Scoping Estimate Key There are many common myths and misconceptions about transportation in Michigan. ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC
D Keep the level of mix in the hopper above the flow gates. Plan Submittal. If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. Fuel oil is not to be used as a release agent. 2022 Selected Projects for FY 2025 Plants are certified in accordance with the HMA Production Manual. When one truck is emptied, it should pull away from the paver. Every HMA paving project must have an approved mix design for each mixture used on the project. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. If the wedging course is 3 inches or less, the inspector should string line the area to be wedged to determine the limits of wedging. The existing surface texture will determine the rate of application up to the maximum rate of 0.10 gallons/square yards. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. The next truck should then be backed toward the paver, stopping short of the paver. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. Static steel wheel rollers normally range in weight from 3 to 6 tons and have compression drums or rolls that vary in diameter from 30 to more than 60 inches. Pavement Type Selection Process; Ride Specification . It is the Contractors responsibility to provide quality control necessary to produce the mixture uniformly, within the limits specified in 20SP501(R) Superpave Hot Mix Asphalt Percent Within Limits (PWL) or 20SP501(S) Superpave Hot Mix Asphalt Percent Within Limits (PWL) For Capital Preventive Maintenance (CPM) Mill & Resurface Projects and CPM One Course Overlay Projects. 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