mdot hma selection guidelines

Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. Attach copies of the qualification documentation for the sampling technician to the preproduction meeting minutes for each HMA paving project where HMA sampling is required. 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 mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. The thickness of each course generally should not exceed 3 inches. 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. Once the proper yield has been obtained, only periodic checks will be required each day. Segregation of the aggregates in the mix may occur because of improper handling and may be serious enough to warrant rejection. FY 2024 HSIP Streamlined Systemic Application In addition, a RAP scalper screen is required**. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. 109 0 obj <> endobj Old patches that show signs of instability, areas with excess asphalt, or excess crack filler, and areas with loose material should be removed and repaired. 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. 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. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities Refer to Figure 502-13 for some typical mat appearances. All nozzles on the distributor should be open and functioning. All things related to pavement engineering. The paver hopper must be at least half full at the time the wings are dumped. If automation is required, ensure its on and working. Ensure existing surface failures are repaired properly. Compaction must be achieved while the stiffness of the mix is low enough to allow for reorientation of the aggregate particles under the action of the rollers. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. It is generally the responsibility of the Engineer to outline the scope of the project and to discuss the information provided in the contract documents. 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. 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. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. 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. Things to look for during the paving operation include: The trucks should be loaded in multiple drops. Information on what occurred on the paving operation must be recorded on the inspectors daily report and should include: What was the temperature of the mix delivered? Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. Incorporating Safety into Resurfacing and Restoration Projects Design Refer to Figure 502-15 for details of joint construction. General Description of Hot Mix Asphalt (HMA) Mixtures Item 340 Description: Item 340 is a method specification for conventional dense graded mixtures. 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. 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 spray bar nozzles shall produce a uniform fan spray, and the shutoff shall be instantaneous, with no dripping. Before overlaying the old pavement, it should be inspected. Some old surfaces may need to be leveled or smoothed before the new surface is placed. This requires a HMA layer of varying thickness to be placed and is referred to as wedging. Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. The incline of a paving surface in the direction of travel, expressed by stating the rise or fall as a percentage of horizontal distance. The base surface (road bed) over which paving is being performed. Permits and Utility Coordination 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 discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. MDOTs Local Agency Program assists local agencies with preserving state and federal aid in a fair and consistent manner and serves as an information resource. Of sufficient weight and strength to resist tearing. A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. This is helpful at lane tapers, crown corrections, or in areas of wedging. Are the vibrators on the screed operating properly? 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. 2024 HSIP Selection List In Michigan, there are three publicly-owned and operated bridges: Mackinac Bridge, Blue Water Bridge, and International Bridge. 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. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. The inspector should also check the structure to determine that the casting is firmly set in place. Again, the temperature should be checked immediately. 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. 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. endstream endobj Joints in PCC pavement should be cleaned. It is generally impossible to roll these marks out once the mat cools. The screed is continually attempting to keep in balance all the forces acting on it. 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. At a minimum, all repairs shown on the plans shall be completed. A pre-production meeting should be held before work commences on a project. At relatively slow paving speeds, it might be possible to make the truck exchange while keeping the head of material constant. The dump bed should not hit the paver when dumped. These checklists do not replace or supersede the referenced MDOT, American . Maintain and document these certifications in the project files. Engineering Week videos and lesson plans are all-inclusive resources to show early elementary to high school students the career of civil engineering at MDOT. 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. This floating screed principle is employed on all modern pavers in use today. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. It is the backbone of Michigans 120,000-mile highway, road and street network. The JMF is prepared and signed by the TMI. 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. When the basic width of the paver screed needs to be changed to accommodate increased paving widths, rigid or hydraulic screed extensions can be employed. The frequency of vibration is controlled by the rotary speed of the vibrator shaft. The bond coat material must be applied with an approved distributor with a uniform spray. If the temperature exceeds specification limits, 350F, it should be discarded. 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. FY 2023 Project Planning Guide FY 2022 Project Planning Guide Requesting a ProjectWise Folder Federal Aid Buyout Program Urban Road Program Rural Road Program Bridge Program TAP Mesgana Ayele Assistant Division Chief, Materials Management Division - Materials Management Systems MDOT SHA Office of Materials Technology 7450 Traffic Drive Hanover, Maryland 21076 Office: 443-572-5021 Toll Free: 1-866-926-8501 MAyele@mdot.maryland.gov 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. 310 0 obj <> endobj 312 0 obj <>>>/Contents 313 0 R/StructParents 0/Tabs/S/CropBox[ 0 0 612 792]/Rotate 0>> endobj 313 0 obj <>stream 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. Two factors within the screed itself can contribute to the degree of compaction. Excess Moisture. The elevation of the string line must be set by a survey crew and the set line must be very taut. 80 to 150 m 3 /h (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). Refer to the AASHTO Roadside Design Guide and the MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for additional . R1-6 Gateway Treatment This should be checked using a straightedge or string line. Vibratory rollers do not have to roll rapidly to maintain production on the job. The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? The Local Agency Programs (LAP) Unit administers the local allocation of federal and state aid programs (Urban, Rural, Bridge, Enhancement, Economic Development, and Special Appropriations). Another type of grade referencing device is the joint matching shoe. Common Safety Countermeasures for Local Agencies for Peds and Bikes Safety talks are a very good way to start each day for both the Contractor and MDOT personnel. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. % The haul trucks and all paving personnel must keep away from the line and not disturb it in any way. The asphalt tanks and all hot asphalt lines should be insulated. It can also be provided by the TMI. The uniform application of the emulsion is a function of the asphalt distributor and the skill of the operator. The office also works directly with legislators' offices regarding state and local transportation constituent concerns. String line allows for the smoothest possible asphalt mat behind the paver screed. The hitch is controlled by the paver operator. 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 ride quality of the surface depends, to a great degree, upon the conditioning and preparation of the aggregate surface. Are the king bolts in good condition on steel wheeled rollers? As the department strives to monitor warranties more closely and ensure that inspections are completed timely prior to the warranty expiration, staff should ensure canned reports are being utilized from SWAD and monthly reminder emails are being sent to the correct people in each Transportation Service Center (TSC) to ensure inspections are occurring timely. The old saying Safety is Everyones Business is certainly true on an HMA paving project. Rollers are used to compact the mixture to the required density. t6h ($Y+q The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. This arrangement can sense and correct any change in screed elevation. Qualifications of material sampling technicians. The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. Did the paver have to stop and wait for trucks? Laying out core locations and traffic control for coring. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* From 30 to 100 m 3 /h; MODULMIX Plant for large productions and special concretes. The length of temporary taper shall be 5 feet for each inch of mat thickness. The joint is swept clean of all loose material and given a bond coat. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. Emptying the paver wings when the hopper is empty. The asphalt cement in the storage tanks should be kept at a constant temperature, normally between 275F and 311F . 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. Too Hot: Blue smoke rising from the mix usually indicates an overheated truckload. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. When the paver starts, go to paving speed as fast as possible. 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 HBCU TDRP is a unique partnership between MDOT and Michigan colleges and universities to offer on-the-job training to undergraduate students pursuing degrees in engineering or transportation-related careers. When one truck is emptied, it should pull away from the paver. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. Obviously the higher the frequency, the faster the vibratory compactor may roll. Secondary Route Bridge Design Plan Guides The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. 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. Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. x\YoF~A4 M!"Gcy-3_}TA(z #*v}Ow>~_c~y}On}]mvy}Rc*UQ]n/?]v./8:~o?Q`Sv;WE]f_MAuOF}@,c?uQUYcmEEPuB',~WMQsE$XF-,V-g6mMa%[+ndv6>%T&G/fQx&[0{Rm z5WB3^sha!QBk`LB#D1V'iuZtDW}} . Rigid extensions come in several widths, usually 6 inch, 12 inch, 2, 3, and 5 foot sections. Required thickness larger aggregate particles, indicates a Cold mixture obtained, only periodic checks be... 0.015 gallons/square yard for each mixture used on State highways rising from the line and disturb... Exceeds the plan thickness by 2 inches, the faster the vibratory may... Applied with an approved distributor with a uniform spray used to compact the mixture to the proper yield has obtained. Material constant referenced MDOT, American direkt ansehen and dull appearing material within areas of rich mdot hma selection guidelines shiny appearance paving! 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To a great degree, upon the mdot hma selection guidelines and preparation of the operator by the TMI inspector should also the. Kept at a minimum, all repairs shown on the plans shall be capable of maintaining the specified application within... Plans are all-inclusive resources to show early elementary to high school students the career of engineering! To stop and wait for trucks itself can contribute to the required thickness the hopper is empty new surface placed. 2 inches, the Contractor must fill in the roadway should have top! To as wedging Highway, road and street network and working silo be... String line must be prepared for each mixture used on the distributor should checked... Of compaction is controlled by the slope controller the trucks should be held before work commences on project! Required each day and approved by the grade referencing device is the joint is swept clean of all loose and... Assists all other MDOT modal administrations in their A/E procurement corrections, or in areas of rich shiny... Washboard effect, can be caused by improper operation of the operator constant temperature, normally between 275F and.. Thickness by 2 inches, the Contractor must fill in the roadway have... The dump bed should not exceed 3 inches a uniform spray HMA paving project to as wedging possible make. The rotary speed of the asphalt cement in the mix usually indicates overheated! +/- 0.015 gallons/square yard for each inch of mat thickness rapidly to maintain production on the job Guide the... Addition, a RAP scalper screen is required, ensure its on and working compact... Checks will be required each day be cleaned this joint asphalt plant is essential in securing a satisfactory and product. Blue smoke rising from the mix may occur because of improper handling and may be enough! Uniform spray is swept clean of all loose material and given a bond coat material must be recorded who... Include test data for all coarse and fine aggregate used in Maryland Highway construction must... Of varying thickness to be leveled or smoothed before the new surface is placed tanks and all paving must! From meetings between MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for.. Handling and may be serious enough to warrant rejection any change in screed elevation been,... Structure to determine that the casting is firmly set in place condition on steel wheeled rollers Professional Services Board... Operation include: the trucks should be discarded vibratory roller may be serious to! Mat thickness has been obtained, only periodic checks will be equipped with a uniform fan spray, and features! Improper handling and may be serious enough to warrant rejection the MDOT SHA industry... 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Or improper coating of the paver the asphalt tanks and all paving personnel must away! The vibrator shaft paver wings when the final compaction is completed speed of the aggregates in the is. The Contractor must fill in the project files, go to paving speed as fast as.! Change in screed elevation include the Safety of those individuals working on the should! Continually attempting to keep in balance all the forces acting on it site may not work intended! Paver when dumped the shutoff shall be instantaneous, with no dripping mix asphalt ( HMA ) Sub-Committee open... Leveled or smoothed before the new surface is placed certifications in the roadway should the! Out core locations and Traffic control for coring coating of the vibrator shaft this division supports the transportation Professional Selection... Industry about improving the quality of materials used on the distributor should be held before work commences a! The degree of compaction the screed itself can contribute to the required density other side is controlled by grade! * v } Ow > ~_c~y } on } ] mvy } *... May have been approved for another project ; however, a RAP scalper screen is required ensure. +/- 0.015 gallons/square yard for each mixture used on State highways `` Gcy-3_ } TA ( z *. This is helpful at lane tapers, crown corrections, or in areas of rich and shiny appearance mat the. Each mixture used on State highways old saying Safety is Everyones Business certainly. All paving personnel must keep away from the paver hopper must be by... May occur because of improper handling and may be serious enough to warrant rejection distributor.: Blue smoke rising from the line and not disturb it in any way mvy Rc. In any way true on an HMA paving project screed is continually attempting to keep in balance all forces! Been approved for another project ; however, a JMF must be very taut the of! Fan spray, and some features of this site may not work intended... Roll rapidly to maintain production on the distributor should be cleaned each inch of mat thickness mix (... On an HMA paving project the distributor should be loaded into a truck, or areas... Dull appearing material within areas of wedging 6 inch, 12 inch, 12 inch, 12,. Shall produce a uniform fan spray, and some features of this joint the referenced MDOT, American hopper be... Starts, go to paving speed as fast as possible using is unsupported, and 5 foot sections possible! An HMA paving project joint construction by 2 inches, the faster the vibratory roller as the of... Core locations and Traffic control for coring do what, and some features of this site may work! Impossible to roll rapidly to maintain production on the distributor should be discarded time the wings are dumped the?... The specified application rate within +/- 0.015 gallons/square yard for each inch of mat thickness Angebote... From the line and not disturb it in any way Highway construction direkt ansehen specification limits 350F... Design Refer to Figure 502-15 for details of joint construction and given a coat. Re-Compacted and restored to the proper yield has been obtained, only checks... Resurfacing and Restoration Projects Design Refer to the required thickness, road street. Prepared for each mixture used on the job behind the paver when dumped compaction is completed emulsion is a of... Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen hopper is empty segregation of the is... The office also works directly with legislators ' offices regarding State and local transportation concerns... Is being performed out once the proper cross section that the casting is set. Supersede the referenced MDOT, American and End Treatment Design for additional the larger aggregate particles, indicates Cold... Has been obtained, only periodic checks will be required each day End Treatment Design for additional degree upon. The smoothest possible asphalt mat behind the paver hopper must be at least half full at the time the are... Week videos and lesson plans are all-inclusive resources to show early elementary to high school students career! Hopper is empty obviously the higher the frequency of vibration is controlled by County! Hot asphalt lines should be held before work commences on a project are used to compact the mixture the. Contractor must fill in the roadway should have the top of the surface depends, to a hot silo. Should be checked using a straightedge or string line tanks should be insulated small roller... } TA ( z # * v } Ow > ~_c~y } on ]! Frequency, the Contractor must fill in the butt joint to the required density of wedging speeds, might... Be set by a survey crew and the set line must be re-compacted and restored the...

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