Weather and air temperature requirements. This will happen on windy days and when the mat thickness is thin, normally the wearing course. Moved Permanently. 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. 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. Some pavements may be disintegrated so badly that the fragments may have to be removed. Asphalt paving projects, like many construction projects, are not always built as originally scheduled. A pass is defined as one trip of the roller in one direction over any one spot. All existing pavements, including newly-constructed HMA widening, which are to be surfaced, should receive a bond coat application. It is MDOTs responsibility to conduct quality assurance and verification sampling and testing to ensure conformity of the mix to 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.This testing is done at the field laboratory provided by the Contractor located at the asphalt plant or at an MDOT Region Lab. This is caused by an improperly adjusted screed angle of attack. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. All roller marks should be removed by the finish roller. Saturated areas must be allowed to dry prior to placing mixture. It may be bubbling or popping as if it were boiling. Design 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. Highway Safety Manual (HSM) Analysis Spreadsheet In the event that an inspection is not completed prior to the expiration of the warranty, it is the departments responsibility to ensure that the inspection still takes place; however, this inspection should be completed only with MDOT forces. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. 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. Pressure distributors are used to apply a uniform application of the asphalt emulsions, normally referred to as the tack or bond coat. When specified, special additives may be required. Keeping the hopper at least half full between truckloads of mix keeps the head of mix in front of the screed constant and this will reduce mat problems. These checklists do not replace or supersede the referenced MDOT, American . It is very easy to visually observe a nonuniform application, as the surface will look streaked. For each roller employed on a project, the mat width should be divided by the width of the compaction roller to determine the number of passes needed to cover the entire width being paved. The tiers identified below apply to Superpave Final Report Part 2 The aggregate used to make the mix can be a single aggregate, but it is generally different sizes blended together through the cold feed bins to produce proper gradation. Checking can be caused by many things, including an excessive deflection of the pavement structure and improper mix properties (high asphalt content, too much middle size sand, or low dust). The slat conveyor on one side operates independently from the movement of the other side. Material from the existing surface is milled out to a depth as shown on the plans, or equal to the top course, across the entire width of the joint and to a length of 35 feet minimum. 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. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. 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. `qr`@UtT! u#$$mB3B2(&qiB[g%R(ck7H,D"-Vg#Y Aggregate is generally sized by means of a screen deck into two to four of these hot bins. Once the proper yield has been obtained, only periodic checks will be required each day. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. The transverse joint in all courses must be carefully constructed and thoroughly compacted to provide a smooth riding surface. Whenever the temperature of the previously placed mats falls below 170F prior to placement of the adjacent mat, or when placing base mix and the air temperature is below 50F, the vertical edges of the initial mat shall be coated with HMA bond coat material before the mixture is placed in the adjacent section. This article returns the responsibility for these tasks to MDOT for all CPM surface seal projects, including those that contain 03SP505A, 03SP507A, 03SP508A, or 03SP508C. Refer to Figure 502-15 for details of joint construction. Testing Of Bituminous Mixtures (Vacuum Worksheet), Daily Report of Contractor's Quality Control Tests, Testing Of Bituminous Mixtures (Centrifuge Worksheet), Verification Testing of HMA Mixtures Marshall Density and Percent Air Voids, Report of Compacted Bituminous Mixture Core Density & Percent Compaction, Verification Testing Of HMA Mixtures Theoretical Maximum Density (TMD), Testing of Bituminous Mixtures Ignition Furnace Worksheet. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. 115 0 obj <<4c7790beb010dcdd18f2ce7848bb2f38>]>>stream At a minimum, all repairs shown on the plans shall be completed. Mixture, if left to stand for a long time in the corners of the hopper, will cool. This type of reference device is used only when the grade being sensed is relatively smooth. . This will allow for a better understanding later if deficiencies develop in the performance of the final product. Materials The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. The top size of the top scalping screen shall be 1.5 for top and leveling courses and 2 for base courses. This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. Other surface blemishes are caused by the truck backing into the paver, the screed settling when the paver stops and when the paver operator empties the hopper wings into an empty hopper. Material Quality. Surface defects are problems that occur in the asphalt mixture during, or soon after, the lay down and compaction process. 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 At the time of the periodic on-site inspection, complete the following tasks: In addition, do not make payment until the measured quantities are checked for correlation to the contractors submitted material certifications/tickets and yield calculations. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. Resources for local governmental agencies that regularly require access to state right of way. If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. 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. Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. Drum mixers come in many different types, such as parallel flow, counter flow, double barrel, drum-within-a-drum and drums with separate mixing chambers (Figure 501-4). The inspector should check the entire pavement surface to ensure that all corrections are made before resurfacing work begins. Samples shall be taken if visual observations show significant variations in existing pavement mat. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. The thickness of each course generally should not exceed 3 inches. MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. Public Notice of Metro Region Bridge Council Meeting for September 28, 2022 The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. Never empty the paver hopper while paving. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. No raking of the joint is needed. The inspector should contact the Region HMA inspector for guidance. The elevation of a fresh mat in relation to the base. Obviously the higher the frequency, the faster the vibratory compactor may roll. The HMA mixture shall be provided to meet the requirements of the current Michigan Department of Transportation(MDOT) 2020 Standard Specifications for Construction except where modified herein. Figure 502-11 illustrates the wedging process. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. Cold-milling machines may be used to do the work involved in the pay item of removing HMA surface by the square foot (square meter). The paver hopper must be at least half full at the time the wings are dumped. A specified number of samples are to be taken from each sublot. Advisories This floating screed principle is employed on all modern pavers in use today. What number and type of rollers were used? Any severely spalled areas at joints should be repaired using partial-depth repair methods. Adjust catch basins after the leveling course has been placed. Flexible Pavement: Transverse joints not being properly constructed. 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. Fuel oil is not permitted for use on tapered joint rollers and mobile mat reference wheels. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. MDOT's A/E internal guidelines, and federal laws and regulations. A pre-production meeting should be held before work commences on a project. All nozzles should be turned at the same angle to the spray bar: approximately 30 degrees, depending upon the manufacturers recommendations. with the proposed access and/or road improvements are required in accordance with standards and practices accepted by MDOT SHA. Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. Section 1: Procedures Manual for HMA Mix Design Processing This section provides the mix design guidelines for Marshall and Superpave Hot Mix Asphalt mixtures for use on MDOT projects. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. 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. When such changes do occur, it is important that they be communicated between the Contractor and MDOT and between MDOT and the Contractor. To minimize mat problems, the paver operator should dump the wings as little as possible. The screed should be raised and the bottom surface checked for smoothness, twisting, and excessive wear. Pavement sags and rough areas may require a wedging course. Large enough to cover the top of the load and extend over sides and tailgate. A bond coat is an application of an asphaltic emulsion to an existing surface as a bond or tack coat ensuring adhesion with the overlying surface and preventing displacement ahead of the roller. It is the Contractors responsibility to obtain the proper pavement density. Fat spots are isolated areas where the asphalt cement has come to the surface; these spots can occur very erratically. It can be configured for automatic grade and slope, or dual grade control, as shown in Figure 502-8. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> If temperatures warrant, the sides and bottom of the truck bed should be insulated. If the temperature exceeds specification limits, 350F, it should be discarded. It is very important to know what special provisions are contained in the proposal. The document has moved here. If distortion of the base course occurs during the paving operation, the mixture placement should be stopped until the condition of the base course is corrected. 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. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. The aggregate base course must meet all the requirements for moisture content, density and smoothness. Things to look for during the paving operation include: The trucks should be loaded in multiple drops. To convert the yield to mat thickness, the following will be helpful: 110 pounds/square yard = 1 inch of thickness. The length of temporary taper shall be 5 feet for each inch of mat thickness. Qualifications of material sampling technicians. Once this has been done, complete the rolling of the joint. Before overlaying the old pavement, it should be inspected. A sublot is defined as 1 mile for this example of in-place 12 foot wide pavement. 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. icPUBJ FP rM4"d_`Sx".HCaM;)v}khmqj*KDRu`JK*l*fiEpg[`+H9g@ Ct)L;9BnLjvJdQP7BHD#},i-7D4lPNy`B_]Z)Hg BWPl!3I8"#wQjBANtNV #P9!#)C6.q]BX9#mCw Following is a list of things that can cause a rough riding surface: A special provision for pavement ride quality measurement is included in many paving contracts. 111 0 obj <>stream At relatively slow paving speeds, it might be possible to make the truck exchange while keeping the head of material constant. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. The screed is equipped with heaters, the purpose of which is to increase the temperature of the cold bottom screed plate to about 320F (160C). Avoid spraying adjacent completed surfaces that will remain exposed. Selection of appropriate pavement marking materials (paint, thermoplastic . 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. This information helps the department identify congested areas, when congestion occurs and how often, cause of delay, and more. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. 4649 0 obj <]>>stream Road Safety Audit The screed is attached to the tractor unit at only one point on each side of the paver. When the inspector sees an improper bond coat application, the operation should be stopped. 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. The bond coat material should be heated to the proper temperature so that it is fluid enough to be sprayed from the nozzles. The finished mat should be smooth and free of blemishes. 2.5 HMA or WMA, HT (19 mm MIXTURE) Polymer Modified (1 @ 2.5) 3 HMA or WMA, HT (19 mm MIXTURE) (1 @ 3) 6 Lime Fly Ash Treated Granular Material (9/C) 13.5 Structure Thickness 6 Chemically Treated Subgrade 7 Shoulder Granular Material (5/C) Multiple lifts of 9.5 mm HMA/WMA should be avoided. {7:r!> -)t=:NuL5oqba5q]oe`0jC Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. 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. Revisions to the HMA-QC Plan may be required by the Engineer prior to its approval. 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. The paver hopper is used to receive and temporarily hold the mixture from the trucks. Mesgana Ayele Assistant Division Chief, Materials Management Division - Materials Management Systems MDOT SHA Office of Materials Technology 7450 Traffic Drive Hanover, Maryland 21076 Office: 443-572-5021 Toll Free: 1-866-926-8501 MAyele@mdot.maryland.gov Is heating system in good working condition? Final Report Part 3 Permits and Utility Coordination Consultant Selection If two pavers running in echelon are used, the construction of the joint is similar to the building of a joint against a cold compacted pavement. The augers are used to distribute the mixture across the total width of the screed. Roller passes must be distributed uniformly over the width and length of the area being compacted. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. 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 Flow Chart 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. 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 certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. Are guards placed on end of spray bar to protect over spray where necessary? In order to keep the paver in balance, where possible, the width of the rigid extensions added should be approximately equal on both sides of the screed. Are circulating systems working properly? 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. Are roller wheels free of openings or projections? Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. See Figure 502-6. It may be necessary for the Contractor to make adjustments of the screed, vibrators, hopper flow gates, or the screed augers, to ensure a uniform surface texture. Document the taking of loose mix samples from behind the paver. Each type of reference can be used on either side of the paver, or on both sides at the same time. Short waves can be caused by a screed in poor mechanical condition, such as too much play in the screed control connections. The temperature should be checked immediately. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* 2 0 obj The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. Ensure sufficient compaction capacity is available. When meeting either a concrete slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling. The aggregates are then proportioned by weight into the mixer, also called the pug mill. 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A scalping screen should be loaded in multiple drops Figure 502-15 for details of joint construction density may..
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