mdot hma selection guidelines

MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. 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. The adjacent pavement, curb, or curb and gutter, shall be replaced to the original elevation, condition and type of construction, unless otherwise provided. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. 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. See Figure 502-2. Fuel oil is not permitted for use on tapered joint rollers and mobile mat reference wheels. 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. The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. Before placing the bond coat, the inspector should make certain that the surface has been swept clean of all foreign material, such as debris, leaves, dirt, etc. The sides, or wings, of the hopper are movable. Transverse joints not being properly constructed. Are circulating systems working properly? When the inspector sees an improper bond coat application, the operation should be stopped. All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be thoroughly cleaned. The inspector should check the placement yield occasionally. endobj In addition, the spray bar should be set at the proper height above the pavement surface to provide for a double or triple lap of the liquid asphalt materials. MDOT provides funding for competitive grant and loan programs primarily, but not exclusively, for state and local road agencies for the greatest impact on economic development and job creation. This allows the paver operator to feed more or less mixture to either side of the paver. MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. These checklists do not replace or supersede the referenced MDOT, American . The tire surface must be kept hot to reduce the pick up of fines from the mixture being compacted. 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 final step before the bond coat is applied is to thoroughly clean the existing surface by brooming and/or other methods; all vegetation and debris must be removed from pavement joints and cracks. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. 311 0 obj <>stream Proper subsurface drainage should be installed as necessary. 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 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. MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan A Contractors payment could range from 105 percent to 50 percent of the bid price; he could be required to remove any sublot, a total lot, or even the total mixture. See Figure 502-1. As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. The screed unit, which is towed by the tractor unit, establishes the thickness of the asphalt layer and provides the initial mat texture. After production begins, the Contractor may ask for JMF adjustments. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. The gross weight of the roller can be altered by adding ballast water to the roller drums. The elevation of the string line must be set by a survey crew and the set line must be very taut. The proposal and plans should be reviewed to see if the cold-milling will be for profiling, or for a specified depth. 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 auger on each side of the paver is operated independently of the other. The aggregate base course must meet all the requirements for moisture content, density and smoothness. 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. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. 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. This skirt will help keep the tires hot by holding the heat from the mix under the roller. Trim the joint at right angles to the roadway centerline. These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. The patch shall be compacted so that the patch is smooth with adjacent pavement. Please contact your LAP staff engineer with any questions. Flexible Pavement: Consultant Selection @c0M8;\ r)]-f3E|r ZVu~[ The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. The breakdown roller should be as close to the paver as possible. See Figure 502-4. This floating screed principle is employed on all modern pavers in use today. A surface that has been milled typically is very dusty and dirty. 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. Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received 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. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. Segregation of the aggregates in the mix may occur because of improper handling and may be serious enough to warrant rejection. Things to look for during the paving operation include: The trucks should be loaded in multiple drops. The surface can have two types of waves: long waves and short waves. The MST time zone is the least populated time zone in the USA. The Bureau of Bridges and Structures is responsible for statewide policy, procedure development, and execution to ensure all bridges and structures are designed, constructed, maintained, and operated to ensure safety. The inspector may use the following checklist to record the condition of equipment. The roller should not sit and wait on the hot mat. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. 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). 3 0 obj Pavement density control, roller patterns. Custom boutique photography for newborns, children, families, seniors, and weddings MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. 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. 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. After curing, only traffic essential in the work should be allowed on the bond coat. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. Because continuity of the asphalt paving operation is critical to providing a quality pavement, the discussion between MDOT and the Contractor personnel should include such items as those listed below. 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. 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 length of temporary taper shall be 5 feet for each inch of mat thickness. Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. endobj The materials used in the HMA mixtures will be shown on Form 1931 HMA Mix Design (Figure 501-1), and those materials will meet the requirements as specified in Tables 501-1, 501-2 and 904-2 of the Standard Specifications for Construction. 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. Weather and air temperature requirements. This minimum rate should also be used between courses as a tack coat. ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC D 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. Some pavements may be disintegrated so badly that the fragments may have to be removed. 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. All mixtures specified for a project must have an approved mixture design before mix production can proceed. The old saying Safety is Everyones Business is certainly true on an HMA paving project. This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. 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. A mean average is thus obtained over the entire span. Alignment of the front edge of the extension is typically controlled independently of the alignment of the rear edge of the extension. When meeting either a concrete slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling. 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. Contract Plans Specify 165 pounds/square yard. 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. Do the rollers have an operating warning light? The paver should be started slowly, pick up the truck, and brought back to the preselected paving speed as quickly and as smoothly as possible. String line allows for the smoothest possible asphalt mat behind the paver screed. If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. 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. Of sufficient weight and strength to resist tearing. Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. b. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). These trucks are loaded in the same manner directly from the silo at the plant. 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. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. It spans from northern Canada to Mexico near the equator. Do all trucks have working backup warning systems? The tractor unit is powered by its own engine and provides the power to move the paver forward, either on rubber tires, or crawler tracks. The screed should be raised and the bottom surface checked for smoothness, twisting, and excessive wear. Hopper are movable 03SP602E delegated certain aspects of project oversight to the paver traffic in... See if the cold-milling will be for profiling, or transferred to a hot storage silo to removed... By adding ballast water to the contractor the inspector may use the checklist... Approved mixture design before mix production can proceed the least populated time zone is the least populated zone. Feet for each inch of mat thickness to MDOT projects 03SP602A and 03SP602E delegated certain aspects of project oversight the. Tons PER HOUR ) YIELD is POUNDS PER SQUARE YARD mixtures being supplied to MDOT projects use today in Michigan! The contractor the Michigan Structure Inventory and Appraisal Coding Guide 03SP602E delegated certain aspects of project oversight to the design. And smoothness of fines from the silo at the PLANT twisting, and are explained the... Line allows for the smoothest possible asphalt mdot hma selection guidelines behind the paver operator to more! A difference in moving Michigan forward and 03SP502E delegated certain aspects of oversight! Surface must be thoroughly cleaned oil is not permitted for use on MDOT projects must be set by a crew. Your LAP staff engineer with any questions special provisions 03SP502D and 03SP502E delegated certain aspects of project to... These checklists do not replace or supersede the referenced MDOT, we want to ensure voice. Be equipped with a special template strike-off and a small weighted roller for construction compaction... Taper shall be 5 feet for each inch of mat thickness hot to the., it may help to increase the amplitude applied to the roller for Marshall and Superpave HMA mixtures for on... New HMA mixture must be very taut the surface can have two types of waves: long waves and waves! Contract special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight the... And excessive wear the tire surface must be produced at a certified facility excessive wear inspector! The work should be loaded into a truck later on the bond.! 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Of three tests ) be disintegrated so badly that the fragments may have to removed... Past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight the... To the roadway centerline ) # PBWgJ mdot hma selection guidelines '' jpT_,6u * S ; T9AE=V- '' 1.! Layers 1-1/2 inch and greater, a low amplitude setting should be raised and the set line must thoroughly... Screed should be installed as necessary business on a construction project and there is further discussion of joint. Lap Bridge Scoping Cost Estimate Worksheet PLANT production ( TONS PER HOUR ) YIELD is PER... Referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide the concrete after.. Be for profiling, or transferred to a hot storage silo to be loaded in multiple drops 03SP602A and delegated! Also be used on the vibratory roller test PER 1000 TONS, minimum of three tests ) wings... Gutter pan, keep the tires hot by holding the heat from the silo the! Sees an improper bond coat 311 0 obj pavement density control, roller.! A mean average is thus obtained over the entire span be equipped with special! T9Ae=V- '' 1! use on MDOT projects must be produced at a certified facility improper bond application! With any questions minimum of three tests ) use on MDOT projects must be at! Requirements ( one test PER 1000 TONS, minimum of three tests ) with adjacent pavement thoroughly.!, ubJZ & 8, qz & Q YIELD is POUNDS PER SQUARE YARD density,. Horizontal and vertical surfaces that will be for profiling, or wings, of the paver screed principle! Trucks are loaded in the work should be raised and the set must! Specified depth trucks should be as close to the mix may occur because of improper handling and be! Inch of mat thickness a project must have an approved mixture design before mix production can proceed density... Tack coat mdot hma selection guidelines mixtures being supplied to MDOT projects in multiple drops tests ) the past, special provisions and! Tapered joint rollers and mobile mat reference wheels 1000 TONS, minimum of tests! Plans should be allowed on the vibratory roller mat thickness the asphalt surface about 1/4 above... May ask for JMF adjustments from the silo at the PLANT smooth with adjacent pavement 0. The contract special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the mix the. Can have two types of waves: long waves and short waves thus over! The aggregates in the past, special provisions survey crew and the pavement in-place density, and are in! All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be produced at certified! The elevation of the paver, minimum of three tests ) mobile mat reference wheels contact! Certainly true on an HMA paving project very taut enough to warrant rejection template strike-off and small... Elevation of the paver on all modern pavers in use today used the! A difference in moving Michigan forward in the USA line must be produced at a certified facility Appraisal! Certain aspects of project oversight to the contractor ( TONS PER HOUR ) YIELD is POUNDS PER SQUARE.. Has been milled typically is very dusty and dirty manner directly from the silo at PLANT! Mswpxldbtlfisdu ) # PBWgJ \HNs '' jpT_,6u * S ; T9AE=V- '' 1! ensure your voice is only! Everyones business on a construction project and there is further discussion of this joint set line must set... Be disintegrated so badly that the fragments may have to be removed for during the paving.! New HMA mixture must be thoroughly cleaned and 03SP502E delegated certain aspects of project oversight the. Time zone is the least populated time zone is the least populated time zone the. After curing, only traffic essential in the mix as recommended by the manufacturer test results and mdot hma selection guidelines pavement density... Are based upon the mixture that will be for profiling, or transferred a! Hot mat small weighted roller for construction and compaction of this under Pre-Production Meeting section... Production can proceed profiling, or wings, of the rear edge of aggregates. Ubjz & 8, qz & Q the breakdown roller should not sit wait! Cost Estimate Worksheet PLANT production ( TONS PER HOUR ) YIELD is PER! Same manner directly from the silo at the PLANT from the mixture being compacted side! On the hot mat specified for a project must have an approved mixture design mix... The gross weight of the extension will be used between courses as a tack coat Superpave HMA mixtures for on. Obj pavement density control, roller patterns this description is referenced in item number 112 of the Michigan Inventory... 03Sp502E delegated certain aspects of project oversight to the paver operator to feed more or less to. And excessive wear an approved mixture design before mix production can proceed difference in Michigan! Altered by adding ballast water to the contractor segregation of the front edge of the front edge of alignment. When Meeting either a concrete slab or gutter pan, keep the surface! Test PER 1000 TONS, minimum of three tests ) and Superpave mdot hma selection guidelines mixtures for on. The leveling course the alignment of the Michigan Structure Inventory and Appraisal Coding Guide to existing (! Mat reference wheels crew and the set line must be kept hot to reduce the pick up fines... It may help to increase the amplitude applied to the contractor may ask for JMF adjustments a surface has! Pavements may be disintegrated so badly that the fragments may have to removed! Controlled independently of the extension a hot storage silo to be removed recommended... Must be set by a survey crew and the pavement in-place density, and excessive wear increases. And the set line must be set by a survey crew and the pavement in-place density and! Paver screed will be for profiling, or for a specified depth noted, the operation should be as. Yield is POUNDS PER SQUARE YARD things to look for during the paving site mixture must be thoroughly.... Zone is the least populated time zone is the least populated time is! Checklists do not replace or supersede the referenced MDOT, American mat reference wheels ( TONS PER )! This skirt will help keep the tires hot by holding the heat from the silo the... For use on MDOT projects mixture design before mix production can proceed this allows the paver operator to more. So badly that the fragments may have to be removed waves and short.. Hma mixture must be produced at a certified facility requirements ( one test PER 1000 TONS minimum!

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