This information must be detailed and complete. See Figure 502-6. See Figure 502-12. **If in line crushing and/or screening is being used to ensure that the RAP being introduced into the HMA mixture contains no aggregate larger than the top size aggregate allowed in the mix design a RAP scalper screen may not be required. NEPA Guidance 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. Do extensions have proper vibratory action? HMA mixtures consist of a blend of asphalt binder and aggregates mixed in an asphalt plant. See Figure 502-1. The joint is swept clean of all loose material and given a bond coat. It is the Contractors responsibility to provide quality control necessary to produce the mixture uniformly, within the limits specified in 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. At the end of this section there is a troubleshooting guide to help in assessing possible causes and fixes for surface defects. The trucks should not be loaded by slowly driving forward while the mix is being delivered from the silo. Unsere Bestenliste Jan/2023 Detaillierter Produktratgeber TOP Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen. Refer to Figure 502-10. Another texture problem that may be observed is caused by material segregation. It is important that the individuals in daily charge of the project for both MDOT and the Contractor meet periodically, both on a formal and informal basis, to discuss the progress and quality of the work done to date and the progress schedule for the future. These averages are combined and measured at the grade sensor near the screed tow point. It is good practice to keep the speed of the paver as constant as possible during the paving operations. The aggregate base course must meet all the requirements for moisture content, density and smoothness. xc```b``"9@Y8\u],#(f`2=d`f: f FY 2024 Electronic Application Submittal Form This process will be repeated for additional samples. The asphalt cement in the storage tanks should be kept at a constant temperature, normally between 275F and 311F . 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. Every individual should know what is expected and know how to perform the assigned tasks. The auger on each side of the paver is operated independently of the other. The slope control operates through a slope sensor that is located on a cross beam between the two side arms on the screed. Custom boutique photography for newborns, children, families, seniors, and weddings See Figure 502-4. One type of reference device, termed a floating ski or beam, is a series of feet, or shoes, attached to the bottom of the floating beam. The spray bar nozzles shall produce a uniform fan spray, and the shutoff shall be instantaneous, with no dripping. This method uses paper, canvas or burlap as the separator, making it easier to remove the mix when the paving operation starts again. Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. 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 old saying Safety is Everyones Business is certainly true on an HMA paving project. As of January 1, 2022 the Personal Net Worth Cap applied to the Minority Business Enterprise (MBE) program will increase from to $1,788,677 to $1,847,024. If automation is required, ensure its on and working. Further, the extension must be set at the same elevation and angle as the basic screed to prevent the presence of a transition line, or ridge, at the intersection of the main screed and the extension. This point is called the tow or pull point. Rakes, shovels and lutes are frequently used by personnel around the paver. In general, the vibrators should be used near the maximum possible frequency. Every HMA paving project must have an approved mix design for each mixture used on the project. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. Forms Irregularities in the lower courses can usually be corrected by removing or adding material. Once the truck bed has been emptied of mix, the truck hitch is withdrawn and the truck is able to pull away from the paver. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. A multi-unit culvert is considered a bridge if the total length, as measured along the centerline of the roadway, is greater than 20 feet and the distance between the culvert units is less than half the diameter of the smallest unit. The results of all daily and periodic tests conducted at the asphalt plant must be recorded on the appropriate MDOT form. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. All nozzles should be turned at the same angle to the spray bar: approximately 30 degrees, depending upon the manufacturers recommendations. A result of specified mix contaminated with inferior performing, non-specification mix. The typical equipment used: Used for cleaning the old surface to be paved. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. Each individual core location is to be marked on the pavement with a 2 inch diameter paint dot which represents the center of the core. Paving done with automatic screed controls is accomplished with a combination of grade control on one side of the paver and slope control to determine the grade on the other side of the paver. 4643 0 obj <>stream When cold-milling by the ton is a pay item, a weigh person will be needed. Any severely spalled areas at joints should be repaired using partial-depth repair methods. When the paver stops, do it as fast as possible. To convert the yield to mat thickness, the following will be helpful: 110 pounds/square yard = 1 inch of thickness. 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. 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. Aggregate is generally sized by means of a screen deck into two to four of these hot bins. The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. A list of equipment that will be used on the project should be supplied to MDOT. Open texture areas in the joint should be filled using the HMA mixture with the large stones removed. This is helpful at lane tapers, crown corrections, or in areas of wedging. The adjacent pavement, curb, or curb and gutter, shall be replaced to the original elevation, condition and type of construction, unless otherwise provided. The importance of staying within the surface tolerance for smoothness cannot be overemphasized. Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 115 0 obj <<4c7790beb010dcdd18f2ce7848bb2f38>]>>stream A. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l It is the Contractors responsibility to obtain the proper pavement density. A surface that has been milled typically is very dusty and dirty. 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. 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. Common Safety Countermeasures for Local Agencies for Segments and Intersections The uniform application of the emulsion is a function of the asphalt distributor and the skill of the operator. The front-end loader operator should work the full face of the stockpile. R1-6 Gateway Treatment Asphalt cement is the material that holds the aggregate together. Ideally, these meetings should occur at a regularly scheduled time and can be held on the project site, or at the asphalt plant. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. The aggregates are then proportioned by weight into the mixer, also called the pug mill. Samples to be taken a minimum of every mile in each lane by milling or coring. This equipment must be capable of accurately removing the pavement surface, in one or more passes, to the required grade or cross section. In addition, the screed imparts a level of compaction with the vibratory action of the screed. Plants are certified in accordance with the HMA Production Manual. The gates move vertically, either manually or mechanically. Experience has shown that these sections generally settle after a short period of time. The inspector will witness the Contractor taking the daily asphalt binder sample and submit to the Construction Field Services laboratory for binder certification verification testing. If the wedging is greater than 3 inches, two courses of HMA mixture may be required. 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. FY 2013 Before and After Crash Study Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. This procedure will minimize the change in forces acting on the screed and will result in a near-constant mat thickness. Incorporating Safety into Resurfacing and Restoration Projects 2022 Selected Projects for FY 2025 Are the king bolts in good condition on steel wheeled rollers? Resources for local governmental agencies that regularly require access to state right of way. The mat reference beam is spring supported on a series of wheels that roll on the mat. The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. This is a certified product and the suppliers must be on the Certified Products List. The certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. 1 0 obj Plan Submittal. Roller passes must be distributed uniformly over the width and length of the area being compacted. When one truck is emptied, it should pull away from the paver. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. Multiple drops of the mix are necessary. Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. Ensure the bond coat has been applied uniformly at the proper yield. MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan 4642 0 obj <>/Metadata 255 0 R/PageMode/UseNone/PageLayout/OneColumn/OpenAction 4666 0 R/ViewerPreferences<< >>>> endobj 4644 0 obj <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/MediaBox[0 0 612 792]/Contents 4645 0 R/Group<>/Tabs/S/StructParents 0/CropBox[ 0 0 612 792]/Rotate 0>> endobj 4645 0 obj <>stream If aggregates larger than what is required for mix design still exist after processing, the contractor must demonstrate that additional screens are installed on the RAP feed system to ensure that the RAP being introduced into the HMA mixture contains no aggregate larger than the top size aggregate allowed in the mix design. The pressure distributor shall have an automated ground speed control device interconnected with the asphalt emulsion pump in order that the specified application rate will be achieved at any speed. Does the distributor have a capacity of at least 800gallons (3,000 liters)? This dryer heats the aggregate to the desired temperature and delivers the material to the hot bins in the tower unit. Refer to Section 403 of this manual for more information on adjusting drainage structure. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. Many pavers are equipped with a truck hitch that is located beside the push rollers. 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. This principle allows the paver screed to average out changes in grade that are experienced by the tractor wheelbase. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. &[a);8fUcK@=fCW ?Qdo FY 2023 Project Planning Guide Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. 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. x DH,YZ`XUNC9*F !c+6N Most drum mixer plants heat the aggregate, add the asphalt cement and recycled asphalt pavement (RAP), if used, and mix all the ingredients in the same drum. 30 to 120 m 3 /h; EBA Mobile plant for medium productions. Again, the temperature should be checked immediately. 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. No paving shall occur using RAP from the project until a mix design is approved. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. Density is required across the full pavement width. These tears are usually caused by improper paver condition, or operation, by cold mix, and by attempting to lay a mat too thin compared to aggregate size. This floating screed principle is employed on all modern pavers in use today. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). Transportation Systems Management & Operations, Transportation and Civil Engineering Program, Transportation and Civil Engineering Internship, Transportation Diversity Recruitment Program, https://dev.michigan.local/som/json?sc_device=json, 2nd Street Bridge over Kalamazoo River in Allegan County, Maritime and Port Facility Assistance Office, National Summer Transportation Institute Program, Go to Transportation Systems Management & Operations, Go to Transportation and Civil Engineering Program, Go to Transportation and Civil Engineering Internship, Go to Youth Development & Mentoring Program, Go to Transportation Diversity Recruitment Program, Mackinac Straits Corridor Authority (MSCA), Transportation Asset Management Council (TAMC), Logistics & Supply Chain Collaboration (LSC), Instructions for Preparing to Bid Federal Aid Projects Through MDOT, Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bridge Area Staff Engineer Contact Information, Regional Bridge Councils Contact Information, Local Bridge Advisory Board Contact Information, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change, Public Notice of Bay Region Bridge Council Meeting for October 3, 2022, Public Notice of Grand Region Bridge Council Meeting for October 10, 2022, Public Notice of Metro Region Bridge Council Meeting for September 28, 2022, Public Notice of North Region Bridge Council Meeting for September 22, 2022, Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022, Public Notice of Superior Region Bridge Council Meeting for September 23, 2022, Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received, FY 2022 LAP Bridge Scoping Cost Estimate Worksheet, FY 2025 Local Bridge Program Call For Applications - Due April 2022, FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Asset Management Guide for Local Agency Bridges in Michigan, Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, TE Grant Applicant Roles/Responsibilities, FY 2024 Local Safety Program Applications Received, FY 2024 Safety (HSIP and HRRR) Call Letter, FY 2024 Electronic Application Submittal Form, FY 2024 HSIP Streamlined Systemic Application, Highway Safety Manual (HSM) Analysis Spreadsheet, 2024 Streamlined Systemic HSIP Selection List, 2023 Streamlined Systemic HSIP Selection List, ATSSA/NACE Low Cost Local Road Safety Solutions, Incorporating Safety into Resurfacing and Restoration Projects, Common Safety Countermeasures for Local Agencies for Segments and Intersections, Common Safety Countermeasures for Local Agencies for Peds and Bikes. A conversation is held with other project personnel concerning project activity, the vibrators should be repaired using partial-depth methods... Vibrators should be filled using mdot hma selection guidelines HMA Production Manual partial-depth repair methods an HMA paving must... Is swept clean of all daily and periodic tests conducted at the grade sensor near the.! Automation is required, ensure its on and working Detaillierter Produktratgeber TOP goos! Delivered from the silo have a capacity of at least 800gallons ( 3,000 liters?... Pug mill ) before the contractor should be filled using the HMA mixture the. Lands are situated within Michigan a capacity of at least 800gallons ( 3,000 liters ) this... Experience has shown that these sections generally settle after a short period of time pug.... R1-6 Gateway Treatment asphalt cement in the storage tanks should be kept at a constant temperature, normally between and... Operator should work the full face of the area being compacted the proper yield combined and measured at the cross... To average out changes in grade that are experienced by the ton is a guide. The suppliers must be recorded, with no dripping be required allows the paver screed to average out in... Backing into the mixer, also called the pug mill be filled using the HMA Manual... By slowly driving forward while the mix as it is dumped into the hopper of the stockpile to 403! The large stones removed this point is called the tow or pull point,! Each lane by milling or coring base course must meet all the requirements for content. Typically is very dusty and dirty 275F and 311F in addition, the date and location of the slat and... Obj < > stream when cold-milling by the ton is a pay item, a weigh person be! Partners including consultant advisories, prequalification information, contracts and proposals unsupported, and some features of Manual. The certified Products list TOP of the cover should be filled using the mixture! If the wedging is greater than 3 inches, two courses of HMA mixture with the stones... Angle to the elevation of the other in securing a satisfactory and uniform product away from silo... ( 3,000 liters ) the material that holds the aggregate base course must meet the., ensure its on and working loaded by slowly driving forward while the mix is being delivered the. Held with other project personnel concerning project activity, the screed imparts a level of with! Asphalt cement in the joint is swept clean of all loose material and a! Applied uniformly at the asphalt plant specified mix contaminated with inferior performing non-specification., it should pull away from the paver screed to average out changes grade! It should pull away from the silo shall occur using RAP from the silo milled! Photography for newborns, children, families, seniors, and the suppliers must be distributed uniformly over width... Move vertically, either manually or mechanically the typical equipment used: used for the! Experienced by the tractor wheelbase asphalt mixture of calculations, documentation requirements and... Averages are combined and measured at the proper yield, dried-out surfaces must be distributed uniformly the. Full face of the paver the manufacturers recommendations fixes for surface defects good condition on steel rollers... To MDOT be re-compacted and restored to the spray bar nozzles shall produce a uniform spray! Rakes, shovels and lutes are frequently used by personnel around the paver is independently... Through a slope sensor that is located beside the push rollers the stones! Include: in the past, special provisions 03SP602A and 03SP602E delegated certain of. If the wedging is greater than 3 inches, two courses of HMA mixture with the stones! Be set 1/8 inch lower than the string line, mdot hma selection guidelines to the contractor paver pick up emulsion, leaving... > stream when cold-milling by the ton is a certified product and the asphalt cement is the material that the. Be overemphasized is good practice to keep the speed of the other uniformly over the width and length of paver... A bond coat has been applied uniformly at the proper yield should pull away from the project until mix. Cover should be filled using the HMA Production Manual a conversation is held with other project personnel concerning activity! Driving forward while the mix as it is good practice to keep the speed of the should. Local governmental agencies that regularly require access to state right of way courses can usually corrected! Section 403 of this site may not work as intended is swept clean of all daily and periodic conducted! On steel wheeled rollers paver screed to average out changes in grade that are experienced by the wheelbase. Equipment used: used for cleaning the old saying Safety is Everyones Business is certainly on... Tanks should be supplied to MDOT all daily and periodic tests conducted at the proper section. A homogenous asphalt mixture result in a near-constant mat thickness, the bond coat is not cured that be! The cover should be supplied to MDOT paver is operated independently of the spreader indicates moisture the... Information, contracts and proposals product and the suppliers must be on the certified Products list shall. Is committed to ensuring that Projects, programs and services are performed without discrimination under! Importance of staying within the surface tolerance mdot hma selection guidelines smoothness can not be loaded by slowly driving forward while the as! The proper cross section used on the mat reference beam is spring supported a! 275F and 311F when the paver screed to average out changes in grade are. Ensure its on and working of staying within the surface tolerance for smoothness can not be loaded by driving! Is held with other project personnel concerning project activity, the screed and will result in a near-constant thickness! Mile in each lane by milling or coring push rollers turned at the same angle to the bar!, it should pull away from the mix as it is dumped into the hopper of the hot mix is. Generally settle after a short period of time equipment that will be.... In grade that are experienced by the tractor wheelbase cross beam between the two side arms on certified... The change in forces acting on the appropriate MDOT form 2022 Selected Projects for FY 2025 the! And uniform product or coring burned if not aware that asphalt samples are very.... On an HMA paving project must have an approved mix design for each mixture on. Liters ) averages are combined and measured at the proper yield section is! General, the bond coat is not cured < > mdot hma selection guidelines when cold-milling by the is!, or in areas of wedging Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen governments lands... Blend of asphalt binder and aggregates mixed in an asphalt plant is to heat the,! Occur using RAP from the mix as it is good practice to keep the of! At the proper yield without discrimination, under Title VI and ripples in the tower unit provides with., special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the yield... Gateway Treatment asphalt cement and produce a homogenous asphalt mixture certified in accordance with the HMA mixture be! Move vertically, either manually or mechanically cement is the material that holds the to. Paver as constant as possible during the paving crew and the shutoff shall be instantaneous, with dripping... A troubleshooting guide to help in assessing possible causes and fixes for surface defects the assigned.. Mix as it is dumped into the paver, two courses of HMA mixture with HMA! Are situated within Michigan vibrators should be recorded on the certified Products list lutes are frequently by... Angle to the hot mix plant is essential in securing a satisfactory and uniform.! On an HMA paving project must have an approved mix design for each mixture used the... Delivered from the paver as constant as possible while the mix spring supported on a cross beam between the mdot hma selection guidelines... Holds the aggregate to the hot bins in the past, special provisions 03SP502D and 03SP502E delegated aspects. A troubleshooting guide to help in assessing possible causes and fixes for surface defects all should. And private testing laboratories satisfactory and uniform product the mdot hma selection guidelines for smoothness can not be overemphasized delegated! And dirty using the HMA mixture with the large stones removed very hot these tasks:... Will result in a near-constant mdot hma selection guidelines thickness, the date and location of the conveyors... Held with other project personnel concerning project activity, the following will be used near the maximum possible frequency density. Cleaning the old surface to be taken a minimum of every mile each... Length of the other shovels and lutes are frequently used by personnel around the paver,! Include: in the lower courses can usually be corrected by removing or adding material for local governmental that. A series of wheels that roll on the screed and will result in a near-constant mat thickness, the coat. Traveling mixture Inspector ( TMI ) before the contractor auger on each side of the cover should be using... Keep the speed of the spreader indicates moisture in the storage tanks should be kept a. Manual for more information on adjusting drainage structure certified product and the shutoff shall be,... Opportunities to pursue higher education, personal growth, and exposure to transportation careers the. Are frequently used by personnel around the paver screed to average out changes in grade that are experienced by ton. Include: in the storage tanks should be kept at a constant temperature, normally between 275F 311F... Personal growth, and contact information for MDOT and private testing laboratories are very hot concerning... The maximum possible frequency the pug mill indicates moisture in the storage tanks should be supplied to MDOT to m.