Are the vibrators on the screed operating properly? See Figure 502-6. Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. When butt joints are called for on the plans or in the proposal, construction should be as follows. Plan Approval. Pavement ride quality is affected by all phases of the construction process; to ensure a smooth finished product, good construction practices must be followed throughout the entire paving process. It may be bubbling or popping as if it were boiling. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. 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. This is helpful at lane tapers, crown corrections, or in areas of wedging. Forms This will allow for a better understanding later if deficiencies develop in the performance of the final product. 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. The screed should be raised and the bottom surface checked for smoothness, twisting, and excessive wear. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. The MDOT plant inspector should follow the sampling and testing procedures explained in the Special Provision 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. It is also used in Mexico. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. It is very important to know what special provisions are contained in the proposal. An approved grade referencing attachment, not less than 30 feet in length, may be used. Care should be exercised to keep dust to a minimum. Plants are certified in accordance with the HMA Production Manual. 30 to 70m 3 /h; EMA Compact plant, perfect for prefabricated. This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. 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. Transverse screed marks are transverse indentations in the mat, which may occur when the paver stops between truckloads. It shall be capable of maintaining the asphalt emulsion at the specified temperature. The finished mat should be smooth and free of blemishes. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. See Figure 502-3. The second unit is the paver screed. t6h ($Y+q Final Report Part 3 If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. Bleeding (flushing) occurs when the asphalt cement comes to the surface under traffic. Compaction must be achieved while the stiffness of the mix is low enough to allow for reorientation of the aggregate particles under the action of the rollers. The surfacing or construction traffic shall not be allowed on the existing pavement until the bond coat has cured. See Figure 502-5 for paver speed based on yield and plant production rates. To preheat the screed, the heaters are normally operated for a period of 10 minutes to 20 minutes before the commencement of the paving operation. The paint dot is to be visible on the core during handling and testing. Yield = 93920 pounds/561.33 square yards= 167.3 lbs/square yard. The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. Every HMA paving project must have an approved mix design for each mixture used on the project. Phone: 443-572-5045 Fax: 410-787-0483 Email: TDavis5@mdot.maryland.gov Admixtures for Concrete Admixtures for Concrete Product Qualification Procedures (PDF, 200 KB) Qualified Products Air Entraining Agents (PDF, 200 KB) Drycast Admixtures (PDF, 200 KB) Precast Admixture (PDF, 200 KB) Type A - Water Reducing (PDF, 200 KB) The asphalt cement in the storage tanks should be kept at a constant temperature, normally between 275F and 311F . The breakdown roller should be as close to the paver as possible. This requires a HMA layer of varying thickness to be placed and is referred to as wedging. Although there are several ways to construct this joint, the most common is the ramp joint. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* This dryer heats the aggregate to the desired temperature and delivers the material to the hot bins in the tower unit. 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. 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. endstream endobj 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 Bond coat shall be applied to the taper before the adjacent lane is placed. 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 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. Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. 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. 115 0 obj <<4c7790beb010dcdd18f2ce7848bb2f38>]>>stream The name of the individual responsible for safety for the Contractor should be provided to MDOT so that rapid and clear communications can be accomplished if safety problems occur. 3 0 obj After curing, only traffic essential in the work should be allowed on the bond coat. Is the automation ski of proper length 30 feet +/- for all courses except last pass top course? The aggregate base must provide a firm foundation before paving commences. The Office of Procurement and Contract Management (OPCM) Consultant Services Division (CSD) procures all Maryland Department of Transportation State Highway Administration (MDOT SHA) A/E contracts using Qualifications-Based Selection (QBS), as defined in Code of Maryland Regulations (COMAR) Title 21, Subtitle 12, "Procurement of Architectural Services and Engineering Services" and 23 CFR . Attention needs to be directed toward joints more than any other phase of HMA construction. Providing the highest quality integrated transportation services for economic benefit and improved quality of life. of seven wheels? A result of specified mix contaminated with inferior performing, non-specification mix. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. The front-end loader operator should work the full face of the stockpile. Ensure the bond coat has broken before paving starts. Are guards placed on end of spray bar to protect over spray where necessary? Revisions to the HMA-QC Plan may be required by the Engineer prior to its approval. Slick, highly polished surfaces, potholes, old patches, cracks and joints may require repairs. 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. Emptying the paver wings when the hopper is empty. Transverse joints not being properly constructed. %PDF-1.7 Things that can cause a nonuniform application are, improper temperature, improper pump speed, sprayer bar height improperly set, spray nozzles clogged, or the nozzle overlap pattern is improperly adjusted. Resources for the development of quality transportation project documents and services. Please contact your LAP staff engineer with any questions. This minimum rate should also be used between courses as a tack coat. As the department strives to monitor warranties more closely and ensure that inspections are completed timely prior to the warranty expiration, staff should ensure canned reports are being utilized from SWAD and monthly reminder emails are being sent to the correct people in each Transportation Service Center (TSC) to ensure inspections are occurring timely. The Office of Governmental Affairs represents MDOT's interests as new or amendatory legislation is developed or moving through the legislative process. The Bureau of Transportation Planning develops and implements a comprehensive transportation planning process which results in investments that are consistent with the policies of the State Transportation Commission. As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. There are, of course, limits to this. See Figure 502-7. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. 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. 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. 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 x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) If the surface of the mat is cooling much faster than the mixture under it, the surface will check as the hot mix is compacted. When the basic width of the paver screed needs to be changed to accommodate increased paving widths, rigid or hydraulic screed extensions can be employed. This method uses paper, canvas or burlap as the separator, making it easier to remove the mix when the paving operation starts again. Cleaning of the roadway surface may be a pay item. This mark can easily be eliminated by adjusting the elevation of the extendable screed in relation to the main screed. Hot Mix Asphalt Selection Guidelines Revised: 03/10/2020 FHWA Approved: 05/07/2020 The following guidelines have been developed at the request of Local Agency Engineers for use on Local Agency projects. Not all of these tools are necessarily used on every project, or every day of a particular job. The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. This is a certified product and the suppliers must be on the Certified Products List. The taper shall be constructed by the use of an approved strike off device attached to the screed that will provide a uniform slope and will not restrict the main screed. . Real Estate Guidance The HBCU TDRP is a unique partnership between MDOT and Michigan colleges and universities to offer on-the-job training to undergraduate students pursuing degrees in engineering or transportation-related careers. If automation is required, ensure its on and working. FY 2022 Project Planning Guide Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. `qr`@UtT! u#$$mB3B2(&qiB[g%R(ck7H,D"-Vg#Y The temperature should be checked immediately. Be in good condition with no holes or tears. For a stiff mix, a higher tire pressure should be used. Resources for general work zone mobility guidelines for engineering and technical staff. MDOT's commissions, councils, task forces, and partnerships are responsible for establishing policies, supervising programs, overseeing state and federal funds, providing recommendations and advisement, and acting as a resource. A list of equipment that will be used on the project should be supplied to MDOT. b. Before overlaying an old HMA pavement, it should be inspected. All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be thoroughly cleaned. The joint is swept clean of all loose material and given a bond coat. . The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Any severely spalled areas at joints should be repaired using partial-depth repair methods. These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. Secondary Route Bridge Design Plan Guides The distance the screed of the trailing paver should extend over the uncompacted mat behind the first paver should be limited to no more than 1 inch. This arrangement permits an average to be taken from the grade surface and another to be taken from the freshly laid mat. 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. The tractor unit receives the asphalt mixture from the haul trucks, carries that mixture back to the spreading augers, distributes the mixture across the width of the screed and pulls the screed over that mixture. Regional Bridge Councils Contact Information See Figure 502-12. Once the line is set at the proper elevation, it is imperative that the line remain untouched both before and after the paver sensor passes over. 26.65 (b) is still subject to the 3-year gross receipts average. documented in the HMA-QC Plan and discussed at the pre-production meeting. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. MDOT Standard Practice for Random Sampling of HMA Materials, Utilizing Reclaimed Asphalt Pavement (RAP) Millings from the Same Project When Using a Portable Hot Mix Asphalt (HMA) Plant, Division 5 - HMA Pavements and Surface Treatments, https://mdotwiki.state.mi.us/construction/index.php?title=501_-_Plant_Produced_Hot_Mix_Asphalt&oldid=6529, 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. Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. No raking of the joint is needed. The haul trucks and all paving personnel must keep away from the line and not disturb it in any way. A pass is defined as one trip of the roller in one direction over any one spot. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. Contract Plans Specify 165 pounds/square yard. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. Are the king bolts in good condition on steel wheeled rollers? Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. When cold-milling by the ton is a pay item, a weigh person will be needed. Ride Specification provides guidance to using the Pavement Surface Profile. The roller pattern should be set up as soon as paving starts. For relatively thin layers of mix, generally less than 1-1/2 inch, the vibratory roller should typically be operated in the static mode. All pavers are equipped with an automatic feed system that, when properly adjusted, supplies mixture to the paver screed to maintain a uniform head of material. The combination of the screed pull point at the end of the leveling arm and the thickness control device at the screed provides for adjustments to be made to the angle of attack 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. Flexible Pavement: The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. Every individual should know what is expected and know how to perform the assigned tasks. This section serves to provide guidance for utilizing Reclaimed Asphalt Pavement (RAP) millings from the same project when using a portable Hot Mix Asphalt (HMA) plant. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. ATSSA/NACE Low Cost Local Road Safety Solutions The aggregate base course must meet all the requirements for moisture content, density and smoothness. The uniform application of the emulsion is a function of the asphalt distributor and the skill of the operator. Failure to do so will jeopardize full federal-aid participation. It can be configured for automatic grade and slope, or dual grade control, as shown in Figure 502-8. The desired degree of cross slope is dialed into the slope controller. Joints that are poorly sealed should have the old seal material removed and the joints cleaned. 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. One make of paver, however, is equipped with a power extendable screed that places the extendable portion of the screed in front of the main screed. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. This equipment must be capable of accurately removing the pavement surface, in one or more passes, to the required grade or cross section. The faster a roller passes over a point on the asphalt surface, the less time the weight of the roller has to work on that point; this means that less compactive effort is applied to the mixture. Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 Cold-milling machines shall be equipped with an automatically controlled and activated cutting drum that is capable of grade reference, maintaining transverse slope control and producing a uniformly textured surface. Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. 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. 30 to 120 m 3 /h; EBA Mobile plant for medium productions. Laying out core locations and traffic control for coring. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). endstream endobj 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. The speed of the paver should be adjusted to give a uniform texture and coordinate satisfactorily with the rate of delivery of the mixture to the paver to provide a uniform placement rate, without intermittent operation of the paver. See Figure 502-1. See Figure 502-2. 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. The MST time zone is the least populated time zone in the USA. The lane edge should not vary more than 1 inch in 3 feet from the established alignment. Screed plates first wear out about four to six inches from the trailing edge. Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. Can VPM be locked in on vibratory rollers? Care should be taken to neatly construct the joint at a right angle to the centerline of the roadway. Hand tools, level, straightedge and boards. The dump bed should not hit the paver when dumped. Test methods to be used should be reviewed to assure that individuals understand the purpose of each test, the location of the field lab and the personnel who are to conduct the tests, the time frame for the communication of the test results and the procedures to be used if failing test results are obtained. FHWA Emergency Relief Program Video If a hydraulically extendable screed is to be used at a fixed width for a period of time, the paver should be equipped with auger extensions to within 12 inches of the end gate. 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