mdot hma selection guidelines

These adjustments should be completed within the first two loads placed. This type of reference device is used only when the grade being sensed is relatively smooth. A paving schedule for the project should be presented and discussed with MDOT. 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 the paver has passed over the structure and the breakdown rolling around the structure has started, the inspector should check the surface elevation with respect to the top of the cover to ensure a smooth ride when completed. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. This is helpful at lane tapers, crown corrections, or in areas of wedging. Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change If required, the truck bed should be insulated. For a stiff mix, a higher tire pressure should be used. These averages are combined and measured at the grade sensor near the screed tow point. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Stop the paver at this point, remove it from the roadway and remove any excess HMA material from the roadway. In addition, a RAP scalper screen is required**. Test methods to be used should be reviewed to assure that individuals understand the purpose of each test, the location of the field lab and the personnel who are to conduct the tests, the time frame for the communication of the test results and the procedures to be used if failing test results are obtained. No matter what type of plant is being used, several key items should be monitored. Paver speed for various production and application rates can be calculated using the following equations or selected from Figure 502-5. Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. The paint dot is to be visible on the core during handling and testing. The completed centerline joint should be uniform, closed and flush with adjacent lanes. 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. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. When the paver starts, go to paving speed as fast as possible. Final Report Part 2 The screed of the second paver must be set at the same level as the screed of the first paver; this will prevent the screed of the second paver from dragging on the mix placed by the first paver. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. Common Safety Countermeasures for Local Agencies for Peds and Bikes This equipment should be thoroughly checked before using it on the project. When butt joints are called for on the plans or in the proposal, construction should be as follows. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. This skirt will help keep the tires hot by holding the heat from the mix under the roller. These gates are used to regulate the amount of mix that can be delivered by the slat conveyors to the augers. These tools include rakes, shovels, lutes, 10 foot straightedge, carpenters level and blocks and shims for supporting the screed of the paver when beginning operations at a butt joint. Is heating system in good working condition? When using drum mix plants, the aggregate moisture content of each stockpile should be taken at least once a day and the number entered into the plant control system. Communication is one of the keys to a safe work environment. Living Snow Fence, Fiscal Year Obligation Reports Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List Bridge railings and piers, curb and gutter pans, and guardrails must be protected from the spray of bond coat by the use of shields. 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. Resources for the development of quality transportation project documents and services. FHWA Emergency Relief Program Video Highway Safety Manual (HSM) Analysis Spreadsheet Rocking slabs must be stabilized. When specified, special additives may be required. The inspector may use the following checklist to record the condition of equipment. The roller pattern should be set up as soon as paving starts. Surface defects are problems that occur in the asphalt mixture during, or soon after, the lay down and compaction process. The temperature of the mix must be kept uniform so that the viscosity of the mix does not change and influence the balance of forces acting on the screed. Risk analysis is specifically used to select appropriate performance standards for various bridge . At the time of the periodic on-site inspection, complete the following tasks: In addition, do not make payment until the measured quantities are checked for correlation to the contractors submitted material certifications/tickets and yield calculations. 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. At the end of this section there is a troubleshooting guide to help in assessing possible causes and fixes for surface defects. 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 Is distributor tachometer working properly? The second unit is the paver screed. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. 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 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). Grey goos vodka - Der Gewinner . Ideally, these meetings should occur at a regularly scheduled time and can be held on the project site, or at the asphalt plant. arkansas tech football schedule 2022 face shape calculator male; ftp command not found linux blooket coin hack github; the cheating pact baby leopard geckos for sale; At MDOT, safety is paramount. MDOT's seven region offices each handle transportation-related construction, maintenance and programs within the region's geographic boundaries. 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. 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. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. These guidelines have been reviewed and approved by the County Road Association of Michigan Engineering Hot Mix Asphalt (HMA) Sub-Committee. 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. Shoulder samples shall be taken if RAP from shoulder is to be used. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. Trim the joint at right angles to the roadway centerline. 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. When such changes do occur, it is important that they be communicated between the Contractor and MDOT and between MDOT and the Contractor. Asphalt cement is the material that holds the aggregate together. Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. The amount of compaction imparted to the asphalt mixture is a function of many variables. A specified number of samples are to be taken from each sublot. 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. 26.65 (b) is still subject to the 3-year gross receipts average. The important part to remember is that although it rolls slower than a static roller, the vibratory machine can usually economically reach specified density with fewer passes. The first yield check should be made as soon as the Contractor has completed all paver adjustments. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities MDOT Highway Safety The aggregates are then proportioned by weight into the mixer, also called the pug mill. This leveling device is attached to the tractor unit at only one point on each side of the paver; it is able to float on the asphalt mixture and to provide initial mat texture and compaction to the material as it passes under it. Consultant Selection The top course will then be placed at a uniform rate. See Figure 502-12. Material from the existing surface is milled out to a depth as shown on the plans, or equal to the top course, across the entire width of the joint and to a length of 35 feet minimum. Mixture temperature should be checked regularly when the mix arrives on the project and recorded on the load tickets. Does the paver have reverse pitch augers or paddles at center of paver? Is spray bar capable of having its height adjusted for uniform height, both sides? Finally, the difference in the alignment of the two screeds can cause a difference in the degree of compaction that is obtained from the screed. Are the king bolts in good condition on steel wheeled rollers? 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. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. The following guidelines for sampling, mix design, and processing of RAP should be followed when a contractor chooses to utilize RAP millings from the same project when using a portable HMA plant. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. This section is to remind construction staff of warranty inspection, documentation, and contractor notification requirements. Laying out core locations, discuss how it will be done. This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. Adjust catch basins after the leveling course has been placed. 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). Do extensions have approved method of heating? 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. R1-6 Gateway Treatment However, if the project does not call for HMA mixtures, or the patching is in advance of the paving operation, any mixture readily available and approved by the Engineer can be used. These vibratory rollers can be operated in any one of three modes: static, with one drum vibrating and one drum static, and with both drums vibrating. There are many common myths and misconceptions about transportation in Michigan. See Figure 502-2. 4 0 obj The Office of Procurement and Contract Management (OPCM) Consultant Services Division (CSD) procures all Maryland Department of Transportation State Highway Administration (MDOT SHA) A/E contracts using Qualifications-Based Selection (QBS), as defined in Code of Maryland Regulations (COMAR) Title 21, Subtitle 12, "Procurement of Architectural Services and Engineering Services" and 23 CFR . If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. If the wedging is greater than 3 inches, two courses of HMA mixture may be required. Public Notice of Metro Region Bridge Council Meeting for September 28, 2022 `qr`@UtT! u#$$mB3B2(&qiB[g%R(ck7H,D"-Vg#Y 111 0 obj <>stream A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. Do extensions have proper vibratory action? Common Safety Countermeasures for Local Agencies for Segments and Intersections Excess Moisture. Sampling frequency required is based on the percentage/tonnage of RAP that will be utilized on the project. Large enough to cover the top of the load and extend over sides and tailgate. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. The bond coat material should be heated to the proper temperature so that it is fluid enough to be sprayed from the nozzles. 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. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. However, the amount of overlap between the first and second lanes is very important. Additionally, a 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request. Laying out core locations and traffic control for coring. Joints that are poorly sealed should have the old seal material removed and the joints cleaned. Deviations in the pavement surface are averaged out over the length of the grade reference device. A slight change in direction, or curl, is beneficial at each reversal spot to further reduce the tendency of the mix to shove under the compactor and to eliminate the possibility of a bump at the point where the roller reversal occurs. If it is within the specification limit, but below optimum placing temperature, steps should be taken immediately to correct the situation by contacting the plant. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) The screed is continually attempting to keep in balance all the forces acting on it. 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. stream Custom boutique photography for newborns, children, families, seniors, and weddings A. Selection. Bond coat material must be applied with an approved distributor with a uniform spray. The ride quality of the surface depends, to a great degree, upon the conditioning and preparation of the aggregate surface. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. Any dust and dirt left on the milled surface will greatly affect the bond between that course and the new overlay. 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 No raking of the joint is needed. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. FY 2022 LAP Bridge Scoping Estimate Key These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. Materials Two factors within the screed itself can contribute to the degree of compaction. Saturated areas must be allowed to dry prior to placing mixture. From 30 to 100 m 3 /h; MODULMIX Plant for large productions and special concretes. It may be necessary to compact these areas by the hand tamper method. The bond coat material must be applied with an approved distributor with a uniform spray. FY 2024 Time of Return (TOR) spreadsheet The operator should not make manual changes while automation is working. Ride Specification provides guidance to using the Pavement Surface Profile. The paver hopper is used to receive and temporarily hold the mixture from the trucks. The adjacent pavement, curb, or curb and gutter, shall be replaced to the original elevation, condition and type of construction, unless otherwise provided. 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. Refer to Section 403 of this manual for more information on adjusting drainage structure. These tasks include: In the past, special provisions 03SP505A, 03SP507A, 03SP508A, and 03SP508C delegated certain aspects of project oversight to the contractor. The Contractor will use several types of rollers and each type is used for different purposes. This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. Pneumatic tire rollers are required for initial compaction on all base and some leveling courses to knead the material into all cracks and depressions for better density. Did you know that millions of people visit the Great Lakes State every year? This article returns the responsibility for these tasks to MDOT for all HMA paving projects, including those that contain special provisions 03SP502D and/or 03SP502E. Material Quality - Resources; Material Quality Partnering Meetings. This process is typically used for superelevation corrections, placing a wedging course so that the leveling and top courses can be placed at a uniform thickness. For this system, a feed control sensor is used to determine the amount of mix in the auger chamber. xc```f`` Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. 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. Rollers can also be a combination of both pneumatic and steel wheel. Ensure the bond coat has broken before paving starts. 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. When rigid extensions are being used in conjunction with the main screed, the crown can usually be altered at any of the points where the extensions are joined. The spray bar nozzles shall produce a uniform fan spray, and the shutoff shall be instantaneous, with no dripping. Roller Checklist - Manufacturer and Roller Number -______________________________________. When one truck is emptied, it should pull away from the paver. Unsere Bestenliste Jan/2023 - Ultimativer Test Beliebteste Modelle Beste Angebote Smtliche Vergleichssieger JETZT direkt ansehen. %PDF-1.5 % FHWA Emergency Relief Flow Chart Vibratory rollers do not have to roll rapidly to maintain production on the job. This document replaces the previous edition of the guidance, published in 2009. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). Forms The initial acceptance form, contained in the contract documents, is to be filled out when the warrantied work has been completed and accepted. These asphalt cements may also contain anti-strip agents. Most mixtures will compact quite readily if spread uniformly and rolled at a temperature that assures proper asphalt binder viscosity. A fast means of communication should be established between the plant and the paving crew so that any changes to the mixture can be promptly communicated. The existing surface texture will determine the rate of application up to the maximum rate of 0.10 gallons/square yards. The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. Qualification of the material sampling technicians should be a pre-production meeting agenda item. This checklist may be placed in the project files. Of sufficient weight and strength to resist tearing. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. 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. 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 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. This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. Does the Contractor have proper number of rollers? 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream 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 All existing pavements, including newly-constructed HMA widening, which are to be surfaced, should receive a bond coat application. Design The amount bid for HMA may be adjusted. Interim and Final Inspection forms must be filled out even if there are no deficiencies and filed in ProjectWise. The dump bed should not hit the paver when dumped. FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 The aggregate base must provide a firm foundation before paving commences. If temperatures warrant, the sides and bottom of the truck bed should be insulated. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* Copies of the letters sent should also be filed in the ProjectWise folder for future reference. Samples shall be taken if visual observations show significant variations in existing pavement mat.