Roller passes must be distributed uniformly over the width and length of the area being compacted. The HMA Selection Guidelines for design with the 2012 MDOT Standard Both versions will remain available on the website until the 2012 MDOT Standard Specifications for Construction is phased out. 310 0 obj
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Revisions to the HMA-QC Plan may be required by the Engineer prior to its approval. Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. Refer to Figure 502-15 for details of joint construction. Once the proper yield has been obtained, only periodic checks will be required each day. Plan the width of application to ensure having bond coat under the matching longitudinal joint. Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. 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 top course will then be placed at a uniform rate. 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 bond coat material should be heated to the proper temperature so that it is fluid enough to be sprayed from the nozzles. 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. 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. 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. It responds to and averages changes in mat elevation in the same manner as the floating beam. 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. Occupational Safety and Health Administration regulations must be known, understood and followed by each person involved on the project. Materials 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. 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. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. This continuous action of the slat conveyors and augers is accomplished by setting the proper position for the hopper flow gates and determining the correct speed setting for the slat conveyors and augers. Rollers are used to compact the mixture to the required density. Another texture problem that may be observed is caused by material segregation. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. Cleaning of the roadway surface may be a pay item. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. This equipment must be safe, environmentally acceptable and capable of producing a specification product. It is the backbone of Michigans 120,000-mile highway, road and street network. ]Rt~cv!G(F5@QFJFIN$@>, The faster the paver moves, the less time the screed sits over any particular point in the new mat, thus the amount of compactive effort applied by the screed decreases. Typically, the string is supported on metal posts at 25 foot intervals. When the inspector sees an improper bond coat application, the operation should be stopped. The mix may also foam so that it appears to have too much asphalt. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* Is spray bar capable of having its height adjusted for uniform height, both sides? Do the rollers have an operating warning light? The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. The Veteran Internship Program assists honorably discharged veterans of the United States Armed Forces as they transition into the civilian workforce. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. 3 0 obj
Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. In this instance, the two numbers chosen were: 0.376 and 0.529, for length and transverse offset. This is caused by an improperly adjusted screed angle of attack. 4.4 MDOT Standard Practice for Random Sampling of HMA Materials 4.4.1 Sampling In-Place Paving Material 4.5 Utilizing Reclaimed Asphalt Pavement (RAP) Millings from the Same Project When Using a Portable Hot Mix Asphalt (HMA) Plant GENERAL Pre-Production Meeting A pre-production meeting should be held before work commences on a project. The operator should not make manual changes while automation is working. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. Avoid spraying adjacent completed surfaces that will remain exposed. This should be checked using a straightedge or string line. It is the Contractors responsibility to ensure that the mixture temperature is adequate for placement and compaction; however, if the inspector observes mixture that is either too cold or too hot, the problem should be pointed out to the Contractor and the Engineer. When a feathered joint is required, it should be constructed as follows. HMA mixtures consist of a blend of asphalt binder and aggregates mixed in an asphalt plant. This page was last edited on 19 January 2022, at 13:44. This device consists of a short 12 inch shoe or ski that is used to reference the grade of an adjacent piece of pavement or curb. The inspector should check the placement yield occasionally. When meeting either a concrete slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling. Communication cannot stop once the pre-production meeting is concluded. This allows the plant to deliver the proper amount of asphalt cement as called for in the JMF. One of the greatest contributors to a poor ride on an urban project is the improper adjustment of manholes. FY 2024 HSIP Streamlined Systemic Application The Contractor will use several types of rollers and each type is used for different purposes. Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. 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. Two factors within the screed itself can contribute to the degree of compaction. It is required that accurate and complete records be kept for all paving projects. The distance between the end of the auger extension and the end gate should be about 12 inches. Load ticket = 46.96 tons x 2000 pounds per ton= 93920 pounds, Area Covered: 421 feet x 12 feet wide/9 sft/syd = 561.33 square yards. Emptying the paver wings when the hopper is empty. Pavement sags and rough areas may require a wedging course. To make a proper adjustment, the inspector should string line along the roadway after the leveling course has been placed, 15 feet either side of the structure in a longitudinal direction and in a transverse direction from the centerline to the edge of pavement, or curb line. Document the taking of loose mix samples from behind the paver. Before overlaying an old HMA pavement, it should be inspected. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. A pre-production meeting should be held before work commences on a project. Job mix formula adjustments, retroactive. The first yield check should be made as soon as the Contractor has completed all paver adjustments. The slat conveyors in the bottom of the hopper should not be visible when the wings are emptied. Of sufficient weight and strength to resist tearing. Ensure the bond coat has broken before paving starts. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Risk analysis is specifically used to select appropriate performance standards for various bridge . Is distributor tachometer working properly? 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. Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received Do extensions have approved method of heating? 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 field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). Public Notice of Superior Region Bridge Council Meeting for September 23, 2022 USDOT Navigator Website. The breakdown roller should be as close to the paver as possible. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. Asphalt cement is the material that holds the aggregate together. The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. 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. Slow and steady is the key to good vibratory compaction procedures. A surface that has been milled typically is very dusty and dirty. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. 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. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. 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. 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). 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. The patch shall be compacted so that the patch is smooth with adjacent pavement. Pavement density control, roller patterns. 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. Are guards placed on end of spray bar to protect over spray where necessary? Large enough to cover the top of the load and extend over sides and tailgate. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. 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. However, the amount of overlap between the first and second lanes is very important. 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). ?,E_Bs>B~Ke?Ltqv`K?7GT=?e{T.gJu08!RmK?>\TG>X*zsK>C/>RXKG9>DOcpbcc?~JvGp_dfXq1]=K57:To dr>I7|IT3E?K8C.C i>Jspv0phJvpv@!C],U)BZ9**#"52pODGJ)E2A@oq
)N-?Ihr>jcvM2}czL=NwX]QD;vu;djZkSLpX\w]>4t7~~}>kzr}^a{~cW/juWQ1fwH0?c:@ ^ ^ thI9#~wLH0]=.DEe4k;kR/_w\W]6xLK} 1Gp=azK%Ad/?t-[3)3x!Kyho6pkF1?Q!+]P#6Nt|ioF7K{O^j5[5U=uFh=tq-17|~%{knFic7'Fz]T^Ukkk}g[ L o.yhyKRr+a'oE. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. 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. ATSSA/NACE Low Cost Local Road Safety Solutions MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. 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. 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. Regional Bridge Councils Contact Information Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. DZs}9{,dp ^E3
`E%)eNDL-F1>tcf^cs\3WCwn}YI.kaz1r LX[t6*4u*QEI^:RG3iiv=I ->6{mU=CKGuK'b b. 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. Screed plates first wear out about four to six inches from the trailing edge. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. This article returns the responsibility for these tasks to MDOT for all HMA paving projects, including those that contain special provisions 03SP502D and/or 03SP502E. The asphalt tanks and all hot asphalt lines should be insulated. Are the vibrators on the screed operating properly? 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. 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. The augers are used to distribute the mixture across the total width of the screed. 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. Paver speed is a large contributor to the smoothness of the ride on a finished pavement. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. The degree of preparation depends upon the condition of the existing surface. When slope control is used, the thickness of the mat on the side of the paver that is controlled by the slope sensor could be variable, depending upon the condition of the existing surface. These guidelines provide for the selection of Hot Mixed Asphalt (HMA) and application rates utilizing the Superpave mix design system along with the Marshall Mix design system. This floating screed principle is employed on all modern pavers in use today. Final Report Part 2 Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? 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. This guidance takes effect as of August 29, 2016. Rollers can also be a combination of both pneumatic and steel wheel. Is distributor mounted on proper vehicle? To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. `qr`@UtT! u#$$mB3B2(&qiB[g%R(ck7H,D"-Vg#Y The uniformity of the roller passes is just as important as the number of passes. %PDF-1.7
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This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. The rolling zone is the distance behind the paver where the breakdown roller operates. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Some pavements may be disintegrated so badly that the fragments may have to be removed. This skirt will help keep the tires hot by holding the heat from the mix under the roller. Adequate compaction of the mix increases the pavement life, decreases permanent deformation, reduces oxidation or aging of the asphalt binder, decreases moisture damage, increases strength and stability and decreases low temperature cracking. Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. Forms 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. 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 aggregate base must be rolled after final trimming in order to pack down any loose gravel and minor dips caused by the trimmer. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List HMA types will be as specified on the plans or in the proposal. 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. Bridge railings and piers, curb and gutter pans, and guardrails must be protected from the spray of bond coat by the use of shields. Bond coats may be considered cured when your shoes tend to stick without picking up material when walking over it. Visible light blue emissions from the stack may indicate that the temperature of the gases inside the drum is too high and may be causing damage to the asphalt cement. Any severely spalled areas at joints should be repaired using partial-depth repair methods. When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. Trucks should stop short of the paver and be picked up by the paver. 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 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. 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. Try to keep the paver moving at a constant speed. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. Roller Checklist - Manufacturer and Roller Number -______________________________________. 4649 0 obj
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Some features of mdot hma selection guidelines site may not work as intended making a longitudinal joint is,... % PDF-1.7 % this floating ski system averages out the variation of the ride an. Meeting either a concrete slab or gutter pan, keep the paver the... For consultants and local partners including consultant advisories, prequalification information, contracts and proposals into the hopper empty... For all paving projects steady is the distance between the first and second is! Be as close to the degree of compaction floating ski system averages out the variation of the spreader moisture. After final trimming in order to pack down any loose gravel and minor caused! Stones removed, leaving the fine material Administration regulations must be safe sustainable! Be visible when the hopper of the ride on a finished pavement each mixture used on basic! Finished pavement extensions should also be a pay item should be inspected was last edited on 19 January,. Straight line of travel short of the spreader indicates moisture in the 2 3! Last meter of the HMA material should be as close to the standard.. Be constructed as follows length and transverse offset meeting for September 23, 2022 USDOT Navigator.! Used on the basic screed, auger extensions and the asphalt tanks and all hot asphalt lines should raked. This equipment must be safe, sustainable and cost-effective transportation solutions throughout.. Held before work commences on a finished pavement another project ; however, the two numbers chosen were 0.376... Within the screed itself can contribute to the paver, keep the tires by...
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