mdot hma selection guidelines

Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. Please contact your LAP staff engineer with any questions. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. Safety talks are a very good way to start each day for both the Contractor and MDOT personnel. The thickness of each course generally should not exceed 3 inches. Ensure mixture temperature is high enough for proper compaction. One make of paver, however, is equipped with a power extendable screed that places the extendable portion of the screed in front of the main screed. 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 base surface (road bed) over which paving is being performed. Ensure the bond coat has been applied uniformly at the proper yield. When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. If segregation is observed, the paving operation should be stopped until the problem is corrected. This procedure will minimize the change in forces acting on the screed and will result in a near-constant mat thickness. The materials used in the HMA mixtures will be shown on Form 1931 HMA Mix Design (Figure 501-1), and those materials will meet the requirements as specified in Tables 501-1, 501-2 and 904-2 of the Standard Specifications for Construction. %PDF-1.5 % 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. Project mixture and testing Special Provisions. 311 0 obj <>stream If it exceeds optimum placement temperature, but does not exceed the specification limit, the truckload is usually not discarded, but immediate steps should be taken to correct the condition. 2023 Streamlined Systemic HSIP Selection List This dryer heats the aggregate to the desired temperature and delivers the material to the hot bins in the tower unit. Mixture, if left to stand for a long time in the corners of the hopper, will cool. Asphalt cement is the material that holds the aggregate together. (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). Resources for local governmental agencies that regularly require access to state right of way. The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. The rollers must be clean and free to rotate to allow smooth forward travel of the paver. MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. Trim the joint at right angles to the roadway centerline. After a short mixing process, the asphalt cement is added and the entire mixture is mixed for 30 to 45 seconds. It is required that accurate and complete records be kept for all paving projects. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) The Local Agency Programs (LAP) Unit administers the local allocation of federal and state aid programs (Urban, Rural, Bridge, Enhancement, Economic Development, and Special Appropriations). A release agent may be applied to the surfaces of the truck or trailer bed. Fuel oil is not to be used as a release agent. When butt joints are called for on the plans or in the proposal, construction should be as follows. The distance the screed of the trailing paver should extend over the uncompacted mat behind the first paver should be limited to no more than 1 inch. Further, whenever rigid extensions are employed, the strike off, or pre-strike off, assembly must be added to the extension and set at the same location as the strike off on the main screed. The front-end loader operator should work the full face of the stockpile. It responds to and averages changes in mat elevation in the same manner as the floating beam. The sides, or wings, of the hopper are movable. Permits and Utility Coordination This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 Ensure the paver speed matches mixture delivery. ]Rt~cv!G(F5@QFJFIN$@>, 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. It spans from northern Canada to Mexico near the equator. Conventional If the required smoothness is obtained in the first course, the subsequent courses can usually be placed uniformly by simply setting the paver for the thickness desired. The rolling zone should be kept as short as possible. If the temperature exceeds specification limits, 350F, it should be discarded. 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. This arrangement can sense and correct any change in screed elevation. Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. When a change in one force occurs, the screed will rise or fall and will change the thickness of the mat being placed. 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*. Transverse screed marks are transverse indentations in the mat, which may occur when the paver stops between truckloads. 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. Thus, the amount of mixture that can be carried back to the augers on one side can be different from the other side. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. There should be enough trucks to provide a continuous flow of mix to the paver. For this system, a feed control sensor is used to determine the amount of mix in the auger chamber. Risk analysis is specifically used to select appropriate performance standards for various bridge . The Contractors representative should be familiar with the project and be able to speak with authority about what is to be accomplished. A diagnostic guide is included here to help in identifying the cause and fix for a range of segregation problems. FHWA Emergency Relief Program Video Any Judge violating such undertakings loses jurisdiction, resulting in his orders being VOID, and he himself commits a treasonable offense against the United States. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. See Figure 502-2. The screed extensions should be level with the main screed. It is very important to know what special provisions are contained in the proposal. 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. 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. In addition to the longitudinal mark, a mismatch in the elevation between the two screeds can also result in a possible difference in surface texture. Rigid extensions come in several widths, usually 6 inch, 12 inch, 2, 3, and 5 foot sections. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. Ensure the surface is cleaned of all dust, dirt and other debris. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. . There are four basic types of grade references that can be employed to maintain the elevation of the screed pull point: the erected string line, the mobile mat reference, 30 foot floating ski, and the joint matching shoe. Plan Submittal. As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. 2024 HSIP Selection List For vibratory rollers, the following can be controlled by the operator: vibration frequency, vibration amplitude and direction of travel, when frequency and amplitude are engaged according to the manufacturers recommendations. Any questions about the information in the contract documents should be raised and clarification requested, if necessary. See Figure 502-3. Do pneumatic rollers have a min. When such changes do occur, it is important that they be communicated between the Contractor and MDOT and between MDOT and the Contractor. Emptying the paver wings when the hopper is empty. 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. This equipment must be safe, environmentally acceptable and capable of producing a specification product. The trucks should not be loaded by slowly driving forward while the mix is being delivered from the silo. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l The paint dot is to be visible on the core during handling and testing. 2023 HSIP Selection List There are three types of mat tearing, or pulling, of the asphalt mix, and each is described by the location of the tear: in the center of the lane, at the outside edges of the lane, or full width. FY 2024 HSIP Streamlined Systemic Application Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. The inspector should also check the structure to determine that the casting is firmly set in place. Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. In addition, the screed imparts a level of compaction with the vibratory action of the screed. R1-6 Gateway Treatment If an unsafe work practice is noticed, corrective action should be taken immediately, even if the paving operation has to be shut down until the unsafe practice is corrected. The tractor unit receives the asphalt mixture from the haul trucks, carries that mixture back to the spreading augers, distributes the mixture across the width of the screed and pulls the screed over that mixture. Refer to Figure 502-10. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* General Description of Hot Mix Asphalt (HMA) Mixtures Item 340 Description: Item 340 is a method specification for conventional dense graded mixtures. The old saying Safety is Everyones Business is certainly true on an HMA paving project. %PDF-1.7 Stop the paver at this point, remove it from the roadway and remove any excess HMA material from the roadway. At MDOT, safety is paramount. The Veteran Internship Program assists honorably discharged veterans of the United States Armed Forces as they transition into the civilian workforce. The details of the quality control program, both on the part of the Contractor and MDOT, should be discussed so that everyone is aware of who is responsible for performing the procedures and when they will be done. The length of temporary taper shall be 5 feet for each inch of mat thickness. Public Notice of North Region Bridge Council Meeting for September 22, 2022 There are many common myths and misconceptions about transportation in Michigan. When the paver starts, go to paving speed as fast as possible. Keeping the hopper at least half full between truckloads of mix keeps the head of mix in front of the screed constant and this will reduce mat problems. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. Selection. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. Profiling is used to establish a new cross section in the existing pavement. Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received Only enough bond coat should be applied that can be covered the same day. These guidelines provide for the selection of Hot Mixed Asphalt (HMA) and application rates utilizing the Superpave mix design system along with the Marshall Mix design system. To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. 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. 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 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. Does the Contractor have proper number of rollers? The mat reference beam is spring supported on a series of wheels that roll on the mat. This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. This material can be neat, unmodified or modified with polymers, rubber, latex, etc. Laying out core locations and traffic control for coring. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. The breakdown roller should be as close to the paver as possible. On two-course projects, the first course should be reduced gradually at a rate of 1 inch in 33 feet and end at a point 33 feet or more from the butt joint. A result of specified mix contaminated with inferior performing, non-specification mix. Job mix formula adjustments, retroactive. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. Because of its short length, the joint matching shoe will not remove any major variations that occur in the existing surface, or adjacent paved lane. All personnel involved in the project must be required to comply with all safety standards applicable to the type of construction and asphalt paving work to be carried out. Trucks should stop short of the paver and be picked up by the paver. of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. Item 340 is generally not recommended for projects with more than 5,000 tons of HMA. Individuals who are working around the paver are susceptible to being hit by passing traffic and have the potential to be hurt by the equipment being used in the paving operation. If the push rollers are not cleaned periodically and do not rotate freely, the truck tires will slide on the rollers and increase the load on the paver. The tractor unit provides the motive power to the paver and to transfer the mixture from the receiving hopper on the front of the paver to the spreading augers at the back of the paver. The TRAC Internship is an extension of the TRAC Program and is designed to provide opportunities for 12th grade students interested in transportation and engineering careers. **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. of seven wheels? Transverse joints not being properly constructed. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). See Figure 502-6. The inspector should ensure that the Contractor is not causing damage to the mat during the compaction process, such as heat checking or cracking stone (white surface appearance). Slick, highly polished surfaces, potholes, old patches, cracks and joints may require repairs. The tire surface must be kept hot to reduce the pick up of fines from the mixture being compacted. 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. A list of equipment that will be used on the project should be supplied to MDOT. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. To convert the yield to mat thickness, the following will be helpful: 110 pounds/square yard = 1 inch of thickness. Of sufficient weight and strength to resist tearing. 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 Whenever the temperature of the previously placed mats falls below 170F prior to placement of the adjacent mat, or when placing base mix and the air temperature is below 50F, the vertical edges of the initial mat shall be coated with HMA bond coat material before the mixture is placed in the adjacent section. Material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions if is! 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