Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. The frequency of vibration is controlled by the rotary speed of the vibrator shaft. Plants are certified in accordance with the HMA Production Manual. The dump bed should not hit the paver when dumped. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. FY 2023 Project Planning Guide FY 2022 Project Planning Guide Requesting a ProjectWise Folder Federal Aid Buyout Program Urban Road Program Rural Road Program Bridge Program TAP The tire pressure used depends, in part, upon the number of plies used in the tires. Ensure the bond coat has been applied uniformly at the proper yield. 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) Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. Material Quality. A diagnostic guide is included here to help in identifying the cause and fix for a range of segregation problems. Avoid spraying adjacent completed surfaces that will remain exposed. Transverse joints not being properly constructed. Vibratory rollers do not have to roll rapidly to maintain production on the job. When constructing the first lane, a string line should be employed to guide the paver operator to establish a uniform edge. Care should be exercised to keep dust to a minimum. Secondary Route Bridge Design Plan Guides Determine the length of one pavement representing a sublot of material, the width of the pavement and the number of samples, (n), needed for each sublot. These adjustments may be allowed if there is reason for the request and as long as the resulting mixture meets the specifications for the project. Project mixture and testing Special Provisions. Additionally, a 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request. Rocking slabs must be stabilized. 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. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. This principle allows the paver screed to average out changes in grade that are experienced by the tractor wheelbase. endobj {7:r!> -)t=:NuL5oqba5q]oe`0jC The paint dot is to be visible on the core during handling and testing. When the paver stops, do it as fast as possible. When specified, special additives may be required. This guidance takes effect as of August 29, 2016. 2 0 obj 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. 80 to 150 m 3 /h 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. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. The lane edge should not vary more than 1 inch in 3 feet from the established alignment. It can be configured for automatic grade and slope, or dual grade control, as shown in Figure 502-8. If it is within the specification limit, but below optimum placing temperature, steps should be taken immediately to correct the situation by contacting the plant. 2022 Selected Projects for FY 2025 MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. 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. The auger and the slat conveyor on the same side must be operated together. Asphalt paving projects, like many construction projects, are not always built as originally scheduled. 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. Once this has been done, complete the rolling of the joint. The screed is attached to the tractor unit at only one point on each side of the paver. The front of the hopper must be constructed in a way to minimize the spillage of mix from the hopper. If segregation is observed, the paving operation should be stopped until the problem is corrected. The inspector should check the placement yield occasionally. 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. The top course will then be placed at a uniform rate. This type of reference device is used only when the grade being sensed is relatively smooth. See Figure 502-2. When a grade reference is used in conjunction with a slope control device, the grade reference sensor is typically positioned on the centerline side of the paver, with the slope controller determining the thickness of the mat on the outside edge of the pavement. Rough, uneven surfaces should be leveled. Common Safety Countermeasures for Local Agencies for Peds and Bikes 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. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. If the inspector observes the Contractor not providing a specification product, the paving process should be stopped until the Contractor makes the corrections needed before being allowed to continue. The purpose of the shoes is to allow one or more of them to pass over a high or low point in the existing surface without altering the slope of the whole beam. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. 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}} . ~zWRGO#wnpOs1`(yvM>.D>N^-E*na71K7L.E5! Rollers are used to compact the mixture to the required density. 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. Certifications are good for one construction season only. Pavement Type Selection Process; Ride Specification . This requires a HMA layer of varying thickness to be placed and is referred to as wedging. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. 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. Do all trucks have working backup warning systems? 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. It is very important that proper air pressure be maintained in all tires. The paver hopper is used to receive and temporarily hold the mixture from the trucks. These averages are combined and measured at the grade sensor near the screed tow point. Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. Unsere Bestenliste Jan/2023 Ultimativer Produktratgeber Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen. Long and short waves can be caused by a fluctuating head of material in front of the screed. Bond coat, also referred to as tack coat, is an asphalt emulsion. Transverse screed marks are transverse indentations in the mat, which may occur when the paver stops between truckloads. &[a);8fUcK@=fCW ?Qdo 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. 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. of seven wheels? These tears are usually caused by improper paver condition, or operation, by cold mix, and by attempting to lay a mat too thin compared to aggregate size. Resources for the development of quality transportation project documents and services. The existing surface texture will determine the rate of application up to the maximum rate of 0.10 gallons/square yards. Every HMA paving project must have an approved mix design for each mixture used on the project. Sampling frequency required is based on the percentage/tonnage of RAP that will be utilized on the project. Resources regarding MDOT's contracting processes, including contractor prequalification, bid letting, contract awards, and contractor payments. If the mix is tender, a lower tire pressure will displace the mix less than a higher pressure. Bond coat shall be applied to the taper before the adjacent lane is placed. Resources for local governmental agencies that regularly require access to state right of way. The desired degree of cross slope is dialed into the slope controller. Care should be taken to avoid overheating, which can cause permanent warping of the screed. 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. The first yield check should be made as soon as the Contractor has completed all paver adjustments. This arrangement permits an average to be taken from the grade surface and another to be taken from the freshly laid mat. Try to keep the paver moving at a constant speed. See Figure 502-4. Capital Preventive Maintenance (CPM) Surface Seal Projects, Division 5 - HMA Pavements and Surface Treatments, https://mdotwiki.state.mi.us/construction/index.php?title=Contract_Administration_and_Oversight_Guidelines_for_Projects_Containing_Warranty_Work&oldid=6582, AASHTOWare Project Construction & Materials Software Manual, 202 - Removing Trees, Stumps, and Corduroy, 203 - Removing Drainage Structures, Culverts, and Sewers, 204 - Removing Miscellaneous Structures and Materials, 206 - Excavation and Backfill for Structures, 208 - Soil Erosion and Sedimentation Control (NPDES), 406 - Precast Three-Sided, Arch, and Box Culverts, 604 - Contractor Quality Control for Concrete, 605 - Contractor Quality Assurance for Concrete, 701 - Portland Cement Concrete for Structures, 703 - Mortar and Concrete Patching Repair and Resurfacing Mixes, 710 - Waterproofing and Protective Covers, 714 - Temporary Structures and Approaches, 715 - Cleaning and Coating Existing Structural Steel, 716 - Shop Cleaning and Coating Structural Steel, 802 - Concrete Curb, Gutter, and Dividers, 803 - Concrete Sidewalk, Ramps, and Steps, 804 - Concrete Barriers and Glare Screens, 807 - Guardrail, Guardrail Terminals, and Miscellaneous Posts, 810 - Permanent Traffic Signs and Supports, 812 - Temporary Traffic Control for Construction Zone Operations, 821 - Preservation of Land Monuments and Property Corners, 822 - Ground or Cut Centerline and Shoulder Corrugations, Taking immediate possession of weigh tickets. Select all. The augers must be extended if the screed is extended. A fast means of communication should be established between the plant and the paving crew so that any changes to the mixture can be promptly communicated. In the longitudinal direction, the rollers should not stop at the same transverse end point with each pass of the roller; the reversal points should be staggered to prevent shoving of the mix. The gross weight of the roller can be altered by adding ballast water to the roller drums. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? FHWA Emergency Relief Program Video The three essential requirements of a bond coat are: Excess bond coat may create a slip plane between courses, bleed into the overlaying course and cause flushing. 2024 HSIP Selection List A specified number of samples are to be taken from each sublot. 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