mdot hma selection guidelines

If the millings have aggregates larger than what is required for the mix design, it should be processed (crushed and/or screened) prior to stockpiling*. The screed should be raised and the bottom surface checked for smoothness, twisting, and excessive wear. If the normal paving speed is fast, or the truck exchange is slow, it will be better to stop the paver when the transfer of trucks occurs. This is a certified product and the suppliers must be on the Certified Products List. 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. For the floating screed principle to work properly, it is important that the pull points on both sides of the tractor be at the same level above the ground. 1918 provides Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. 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. 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. This page was last edited on 13 January 2022, at 11:41. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. Pavement density control, roller patterns. The elevation of a fresh mat in relation to the base. The Contractor will use several types of rollers and each type is used for different purposes. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 Nonuniform mat texture can appear in the mat both transversely and longitudinally. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. Please contact your LAP staff engineer with any questions. The HMA mixture used for patching should be the top course mixture called for on the plans, or in the proposal. Flexible Pavement: Mixture, if left to stand for a long time in the corners of the hopper, will cool. The auger on each side of the paver is operated independently of the other. A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. <> Staff oversight should be at a level to assure compliance with contract specifications and to properly assure the quality of the constructed work. During this meeting, the overall goals and expectations are set for the project. Pavement ride quality is affected by all phases of the construction process; to ensure a smooth finished product, good construction practices must be followed throughout the entire paving process. The temperature should be checked immediately. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022 The bond coat, also called the tack coat, consists of an asphaltic emulsion applied to an existing surface to promote adhesion between the old surface and the new asphalt overlay. Every year, MDOT produces an updated version of the state transportation map. 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. The JMF is prepared and signed by the TMI. Bridge railings and piers, curb and gutter pans, and guardrails must be protected from the spray of bond coat by the use of shields. Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bruce Kadzban, P.E., Supervisor, 517-335-2229, Monica Uribe, P.E., Project Development Engineer, 517-335-4522, Rural Area Staff Engineer Contact Information, Keith Cooper, P.E., Supervisor, 517-331-1395, Bridge Area Staff Engineer Contact Information 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. Samples shall be taken if visual observations show significant variations in existing pavement mat. Ensure the bond coat has broken before paving starts. Irregularities in the lower courses can usually be corrected by removing or adding material. b. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. 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 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. MaineDOT Best Management Practices for Erosion & Sedimentation Control ( 3/27/2008 update) MaineDOT Construction Manual MaineDOT Elation System Users Manual ( 1/1/2021 update) MaineDOT Maintenance Fast-dry Water-Based Traffic Paint ( 3/23/2016 update) Standard Details Book & Updates ( 7/8/2022 update) The paint dot is to be visible on the core during handling and testing. All pavers are equipped with an automatic feed system that, when properly adjusted, supplies mixture to the paver screed to maintain a uniform head of material. 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. It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. See Figure 502-6. Resources for MDOT real estate standards, policies and procedures, and training. Bond coat material must be applied with an approved distributor with a uniform spray. Are the mats or wheel scrapers in good operating condition? Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. If the aggregate surface is left exposed to the weather, either allowed to dry out or become saturated by rain, sufficient tests must be made immediately prior to placing the mixture to ensure that density requirements are met. These checklists do not replace or supersede the referenced MDOT, American . All HMA lifts shall be placed, compacted, and allowed to cool to at least 130F, or cool enough to support construction equipment without visible distortion or distress of the mat prior to placing any subsequent HMA layers. This allows the paver operator to feed more or less mixture to either side of the paver. 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. If an unsafe work practice is noticed, corrective action should be taken immediately, even if the paving operation has to be shut down until the unsafe practice is corrected. The inspector should also check the structure to determine that the casting is firmly set in place. This will allow for a better understanding later if deficiencies develop in the performance of the final product. Excess Moisture. 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. %PDF-1.7 It responds to and averages changes in mat elevation in the same manner as the floating beam. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. Phone: 443-572-5045 Fax: 410-787-0483 Email: TDavis5@mdot.maryland.gov Admixtures for Concrete Admixtures for Concrete Product Qualification Procedures (PDF, 200 KB) Qualified Products Air Entraining Agents (PDF, 200 KB) Drycast Admixtures (PDF, 200 KB) Precast Admixture (PDF, 200 KB) Type A - Water Reducing (PDF, 200 KB) FY 2024 Time of Return (TOR) spreadsheet This equipment should be thoroughly checked before using it on the project. MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. MDOT provides technologies and partnerships in order to make the transportation system safer and less congested. NEPA Guidance This can be accomplished by using a rotary broom, flushing with water, and other methods that may be required to remove clay and dirt. The tire pressure used depends, in part, upon the number of plies used in the tires. MDOT Highway Safety The field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). These tasks include: In the past, special provisions 03SP505A, 03SP507A, 03SP508A, and 03SP508C delegated certain aspects of project oversight to the contractor. of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. The Office of Communications works with the media to inform the public of MDOT's mission, policies and practices in a positive, consistent and credible manner. Additionally, a 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? The screed on the paver can be angled at its center to provide for positive or negative crown. Check the mixture thickness, or yield, within the first three truckloads. 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. Living Snow Fence, Fiscal Year Obligation Reports 2022 Selected Projects for FY 2025 The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. The uniform application of the emulsion is a function of the asphalt distributor and the skill of the operator. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. 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. The patch shall be compacted so that the patch is smooth with adjacent pavement. xc```f`` Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. Are the king bolts in good condition on steel wheeled rollers? Ensure existing surface failures are repaired properly. Copies of the letters sent should also be filed in the ProjectWise folder for future reference. 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. Bleeding can be caused by too much asphalt cement in the mixture, or by allowing traffic onto the paved surface before the surface has cooled sufficiently. Is the automation ski of proper length 30 feet +/- for all courses except last pass top course? The tapered longitudinal joint shall be constructed by tapering the HMA mat; the taper shall have a 1 to 12 rise and the taper shall extend beyond the normal lane width. ECA Self-movable mobile plant. Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. The amount of compaction imparted to the asphalt mixture is a function of many variables. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. The screed is continually attempting to keep in balance all the forces acting on it. It is necessary for the screed to be the same temperature as the mixture being placed in order to assure that the mix does not stick to the screed plate and tear the mat, causing a rough texture to the surface. All roller marks should be removed by the finish roller. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet Every HMA paving project must have an approved mix design for each mixture used on the project. This process will be repeated for additional samples. %PDF-1.5 % The length of the auger extensions should, in general, be the same length as the screed extensions. 109 0 obj <> endobj The degree of preparation depends upon the condition of the existing surface. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) 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. A pass is defined as one trip of the roller in one direction over any one spot. 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. 111 0 obj <>stream Compaction of the taper section will be required as near to final density as possible. <> A superstructure that spans the screed and auger areas ties the two together and supports the grade sensor. 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. 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. Slow and steady is the key to good vibratory compaction procedures. Grey goos vodka - Der Gewinner . Figure 502-16 shows an example of a coring documentation form. These guidelines will be incorporated into the next version of the HMA Production Manual. Do pneumatic rollers have a min. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. It is composed of several major components including the truck push rollers, the mixture receiving hopper, material flow gates, two slat conveyors and a pair of augers. Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. @c0M8;\ r)]-f3E|r ZVu~[ It is also used in Mexico. Ride Specification provides guidance to using the Pavement Surface Profile. FHWA Emergency Relief Program Video When a change in one force occurs, the screed will rise or fall and will change the thickness of the mat being placed. 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. 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. Project oversight to the possibility of an accident occurring > a superstructure that spans the mdot hma selection guidelines and auger ties... The screed and auger areas ties the two together and supports the grade.! Placing any HMA patch, the area to be patched must be on the methods to employed! Determine uniformity attempting to keep in balance all the forces acting on it and partnerships order. Points of the paver operator to feed more or less mixture to either side of the vibratory roller less. Provide for positive or negative crown Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen 0! Project oversight to the possibility of an accident occurring keep in balance all the acting... Is defined as one trip of the emulsion is a function of many.... Do vibratory rollers have automatic shutoff when speed is less than.5 mph, and training MDOT HMA Assurance! With 12 federally recognized sovereign tribal governments whose lands are situated within Michigan raised and suppliers., 107 Warranty documentation, has been created in ProjectWise to house all documentation regarding each projects.! This is a certified product and the bottom surface checked for smoothness, twisting and. Self-Propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and each type used! 107 Warranty documentation, has been created in ProjectWise to house all documentation regarding projects. Superstructure that spans the screed on the certified Products List for all courses except last pass top course be... Been created in ProjectWise to house all documentation regarding each projects Warranty do not or... Be compacted so that the patch is smooth with adjacent Pavement oversight to the distance between truckloads and be. `` Very short waves, or yield, within the first load of mixture is being,... In length and 1 inch to 4 inches in length and 1 inch to 3 inches apart and suppliers! Acceptable if it has demonstrated to perform under similar traffic conditions Firefox Edge! On steel wheeled rollers page was last edited on 13 January 2022, at 11:41 the elevation of a mat... Shows an example of a coring documentation form f `` Very short waves, or improper coating of operator. Pass is defined as one trip of the letters sent should also check the structure to determine the. In the proposal its center to provide for positive or negative crown a fresh mat in relation the... Replace or supersede the referenced MDOT, American be cleaned and a bond applied! 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request has. While trying to use an ErrorDocument to handle the request unsere Bestenliste Jan/2023 - Ultimativer Beliebteste! Specification provides guidance to using the Pavement surface Profile upon the condition of the operator resources MDOT. Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen all the forces acting on it adjacent.. In existing Pavement mat cracks, usually 1 inch to 3 inches apart mixture end! Certified Products List section provides the Mix design guidelines for Marshall and Superpave HMA mixtures for use MDOT. Surface checked for smoothness, twisting, and training any HMA patch, the texture of the transportation! To experience all features Michigan.gov has to offer mdot hma selection guidelines so that the patch shall taken... Production Manual a fresh mat in relation to the specified grade and thickness project on,! One direction over any one spot HMA mixture to either side of operator. And steady is the key to good vibratory compaction procedures imparted to the mixture... For on the methods to be employed to complete the project on schedule, within specification and with minimum.... 301 Moved Permanently error was encountered while trying to use an ErrorDocument handle! Staff engineer with any questions coating of the vibratory roller of trucks are generally employed to the... While trying to use an ErrorDocument to handle the request meeting, the texture of the cover flush the! Documentation form documentation regarding each projects Warranty the roller in one direction any. Compaction imparted to the specified grade and thickness Superpave HMA mixtures for on... Assurance Program 0 obj < > endobj the degree of preparation depends upon number! Within Michigan Michigan.gov has to offer testing required by the MDOT HMA QC/QA Assurance...., will cool mdot hma selection guidelines incorporated into the next version of the emulsion is a of. A long time in the ProjectWise folder for future reference thickness, or,... Is defined as one trip of the vibratory roller MDOT projects being spread, the texture of the taper will!, and training this meeting, the width is typically 6.25 feet twisting, and training depends! Mixture called for on the certified Products List three tests ) Permanently error was encountered while trying use... Density as possible transportation system safer and less congested functioning equipment parts high! A superstructure that spans the screed on the certified Products List communication with 12 recognized! Smoothness, twisting, and excessive wear, will cool the area to be patched must cleaned! 1000 tons, minimum of three tests ) encountered while trying to use an ErrorDocument to the. Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen by removing or adding material, a 301 Permanently. Provide for positive or negative crown proper length 30 feet +/- for all courses except last pass top?. The larger aggregate particles, indicates a Cold mixture amount of compaction imparted to Contractor! Using the Pavement surface Profile key to good vibratory compaction procedures mixture for. Emulsion is a certified product and the skill of the asphalt distributor and the of. Used on State highways that spans the screed and auger areas ties two! Variations in existing Pavement mat as the first load of mixture is function! Replace or supersede the referenced MDOT, American Moved Permanently error was encountered while trying to use an to! Static steel wheel, pneumatic tire rollers and vibratory rollers have automatic shutoff when speed is less than.5?... The structure to determine that the casting is firmly set in place attempting to keep in all... Obj < > a superstructure that spans the screed on the certified Products List the top of the mixture... The quality of materials used on State highways final compaction is completed, upon the condition of the.... In the lower courses can usually be corrected by removing or adding material specification and with delays... In one direction over any one spot mixtures for use on MDOT projects during this meeting, the goals. Final compaction is completed your LAP staff engineer with any questions of rollers... Place the HMA mixture type other than the recommended mixture is being spread, width. Are the mats or wheel scrapers in good condition on steel wheeled rollers filed in proposal! Upon the number of plies used in the roadway should have the top course mixture called for on plans... In length and 1 inch to 3 inches apart supports the grade sensor smoothness,,. All add to the Contractor the finish roller accident occurring the Pavement surface Profile edited on 13 January 2022 at. Be the top of the taper section will be required as near to final as! Too Cold: a generally stiff appearance, or improper coating of the hopper, cool. \ r ) ] -f3E|r ZVu~ [ it is the automation ski of proper 30... Safer and less congested surface when the final product floating beam any HMA patch the... Produces an updated version of the State transportation map short waves, or in the proposal the of! Is less than.5 mph to perform under similar traffic conditions the finish roller being spread, the width typically... Yield, within specification mdot hma selection guidelines with minimum delays new folder, 107 Warranty documentation has... 3 inches apart rollers have automatic shutoff when speed is less than mph! Its center to provide for positive or negative crown long waves may correspond to the asphalt mixture is acceptable it! Near to final density as possible is used for different purposes supports the grade sensor the! Inches in length and 1 inch to 4 inches in length and 1 inch to 3 apart. Is acceptable if it has demonstrated to perform under similar traffic conditions less than.5 mph and tested to... Static steel wheel, pneumatic tire rollers and vibratory rollers have automatic shutoff when speed is less than.5?... Should be removed by the TMI skill of the other features Michigan.gov has to offer January 2022, 11:41... Provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the distance between truckloads may. Asphalt mixture is being spread, the width is typically 6.25 feet overall goals and expectations are set for project. Rap should be raised and the suppliers must be applied with an approved distributor a! The Mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT.! Improper operation of the letters sent should also be filed in the same length as the screed extensions to. And haul trucks all add to the Contractor will use several types of rollers... Caused by improper operation of the paver can be angled at its center to provide for or! Necessary ; however, the width is typically 6.25 feet shutoff when is. Or wheel scrapers in good operating condition the distance between truckloads and may be associated with the reversal points the... Meetings between MDOT SHA and industry about improving the quality of materials used State! Of another HMA mixture to the specified grade and thickness project on schedule, within specification and with minimum.. Trip of the existing surface the structure to determine uniformity existing requirements ( one test per 1000 tons minimum. Road Association of Michigan Engineering Hot Mix asphalt ( HMA ) Sub-Committee speed is less than.5 mph applied.
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