Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. 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. This skirt will help keep the tires hot by holding the heat from the mix under the roller. Ride Specification provides guidance to using the Pavement Surface Profile. Transportation Reality Check takes on some of these myths, and explains why MDOT does things the way they do. Does paver have properly working screed heaters? 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. The initial acceptance form, contained in the contract documents, is to be filled out when the warrantied work has been completed and accepted. These guidelines will be incorporated into the next version of the HMA Production Manual. Yield = 93920 pounds/561.33 square yards= 167.3 lbs/square yard. Permits and Utility Coordination The ride quality of the surface depends, to a great degree, upon the conditioning and preparation of the aggregate surface. Copies of the letters sent should also be filed in the ProjectWise folder for future reference. Asphalt paving projects, like many construction projects, are not always built as originally scheduled. Multiple drops of the mix are necessary. 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. **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. This process will be repeated for additional samples. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. When cold-milling by the ton is a pay item, a weigh person will be needed. When slope control is used, the thickness of the mat on the side of the paver that is controlled by the slope sensor could be variable, depending upon the condition of the existing surface. When butt joints are called for on the plans or in the proposal, construction should be as follows. Density is required across the full pavement width. Once the line is set at the proper elevation, it is imperative that the line remain untouched both before and after the paver sensor passes over. FY 2024 Time of Return (TOR) spreadsheet Another texture problem that may be observed is caused by material segregation. 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. If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. The pattern of segregation can normally identify the cause of the segregation. 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. Pavement sags and rough areas may require a wedging course. Every individual should know what is expected and know how to perform the assigned tasks. At the end of this section there is a troubleshooting guide to help in assessing possible causes and fixes for surface defects. 1 0 obj
The insulation should be tight against the body of the bed; there should be no gaps between the side of the truck and the insulation through which air could move. Please contact your LAP staff engineer with any questions. A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. Placing the mat too thin based upon the aggregate size. Check the mixture thickness, or yield, within the first three truckloads. This is caused by an improperly adjusted screed angle of attack. . Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. Does the paver have reverse pitch augers or paddles at center of paver? Does the Contractor have proper number of rollers? MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. The operator should not make manual changes while automation is working. Is spray bar capable of having its height adjusted for uniform height, both sides? 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. It is the MDOT inspectors responsibility to ensure that the Contractor is providing a specification product. DZs}9{,dp ^E3
`E%)eNDL-F1>tcf^cs\3WCwn}YI.kaz1r LX[t6*4u*QEI^:RG3iiv=I ->6{mU=CKGuK'b As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. One procedure should constantly be followed: if in doubt about whether the information is important or beneficial, write it down. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Automatic screed controls are employed to keep the elevation of the pull points on the paver at a more constant elevation relative to the grade reference being used. See Figure 502-3. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. The OAG audit found the lack of documentation regarding the initial acceptance of the warrantied work, interim and final inspections, and notification to the contractor and Surety Company after the final inspection was completed. The inspector should check the placement yield occasionally. The inspector may use the following checklist to record the condition of equipment. The rolling zone should be kept as short as possible. Open texture areas in the joint should be filled using the HMA mixture with the large stones removed. Weather and air temperature requirements. Are guards placed on end of spray bar to protect over spray where necessary? Be in good condition with no holes or tears. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. Do extensions have proper vibratory action? When a feathered joint is required, it should be constructed as follows. 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. Common Safety Countermeasures for Local Agencies for Peds and Bikes The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. FY 2022 LAP Bridge Scoping Estimate Key Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced.
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NDRC nt-+^`w0=}~uSn}~yr=tCe#uzZj7c@@ 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. 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. Only enough bond coat should be applied that can be covered the same day. The faster the paver moves, the less time the screed sits over any particular point in the new mat, thus the amount of compactive effort applied by the screed decreases. An approved grade referencing attachment, not less than 30 feet in length, may be used. What number and type of rollers were used? Item 340 is generally not recommended for projects with more than 5,000 tons of HMA. Figure 502-11 illustrates the wedging process. A sufficient amount of millings or cores shall be taken at each test location to ensure an adequate amount of RAP is obtained to perform a full mix design. Bleeding (flushing) occurs when the asphalt cement comes to the surface under traffic. 2024 HSIP Selection List Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. ECA Self-movable mobile plant. Once the proper yield has been obtained, only periodic checks will be required each day. 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. 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 floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. The gates move vertically, either manually or mechanically. Plan Submittal. It may be bubbling or popping as if it were boiling. This mark can easily be eliminated by adjusting the elevation of the extendable screed in relation to the main screed. 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 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. 2 0 obj
If a good bond is not formed between the existing surface and the new overlay, a slippage, or sliding-type, failure can easily occur. Ensure the surface is cleaned of all dust, dirt and other debris. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. Cold-milling machines shall be equipped with an automatically controlled and activated cutting drum that is capable of grade reference, maintaining transverse slope control and producing a uniformly textured surface. Secondary Route Bridge Design Plan Guides MDOT's seven region offices each handle transportation-related construction, maintenance and programs within the region's geographic boundaries. Communication is one of the keys to a safe work environment. 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. t6h ($Y+q Slow and steady is the key to good vibratory compaction procedures. 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) MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan 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 paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Trying to reconstruct events at a later time without written notes and complete test data is usually frustrating and often results in conflicting opinions as to exactly what happened. Laying out core locations and traffic control for coring. *If approved by the engineer, in line crushing and/or screening will be allowed in lieu of processing RAP into a stockpile. Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 These guidelines have been reviewed and approved by the County Road Association of Michigan (CRA) Engineering Committee, and concurred with by Federal Highway Administration (FHWA) Michigan Section, and MDOT. Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet Do pneumatic rollers have a min. 4643 0 obj
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Long and short waves can be caused by a fluctuating head of material in front of the screed. Highway Safety Manual (HSM) Analysis Spreadsheet Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022 See Figure 502-2. Thus, the samples will be taken at 1985 and 6.3 feet from the beginning of the pavement. This arrangement permits an average to be taken from the grade surface and another to be taken from the freshly laid mat. Fat spots can be caused by high moisture in the mixture; if the mixture is very hot, asphalt could run down to the bottom of the truck during transport and cause fat spots when dumped into the paver. All traffic must be kept off of the bond coat until it is cured. endstream
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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. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC
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Mixture types to be used and the sampling and testing procedures vary depending on the specifications used. The top course will then be placed at a uniform rate. A. (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). When a change in one force occurs, the screed will rise or fall and will change the thickness of the mat being placed. This section serves to provide guidance for utilizing Reclaimed Asphalt Pavement (RAP) millings from the same project when using a portable Hot Mix Asphalt (HMA) plant. Many pavers are equipped with a truck hitch that is located beside the push rollers. This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. The department also produces numerous geographic information system maps to assist commuters, tourists, and businesses. The applied amplitude is determined by the location of the eccentric weights that are located on the shaft. The subject of joints includes longitudinal joints and transverse joints, as well as the matched joint between an asphalt surface and a concrete pavement, or gutter pan. Adjust catch basins after the leveling course has been placed. This certification includes the approval of the field laboratory used for acceptance testing, the Contractors quality control plans (which should be available at the plant) and other plant operational requirements. Each individual core location is to be marked on the pavement with a 2 inch diameter paint dot which represents the center of the core. 81R ?+iKEsNAn#w 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.
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. Roller Checklist - Manufacturer and Roller Number -______________________________________. The screed is equipped with heaters, the purpose of which is to increase the temperature of the cold bottom screed plate to about 320F (160C). [ LlhwY6JgUMKu[N@Ws`#hm]4p{$dtm 32f.n4y9y{UU4oCnta'XfouA>8"DlygJu Most of our manuals, publications, and forms are available online. Transverse joints not being properly constructed. Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. The results of all daily and periodic tests conducted at the asphalt plant must be recorded on the appropriate MDOT form. Safety talks are a very good way to start each day for both the Contractor and MDOT personnel. Of sufficient weight and strength to resist tearing. These trucks are loaded in the same manner directly from the silo at the plant. Resources for local governmental agencies that regularly require access to state right of way. Bond coat material must be applied with an approved distributor with a uniform spray. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. 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. Once the pavement has dried, multiple passes of a mechanical broom are needed to remove all the residual grit from the milled surface. To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. This will allow for a better understanding later if deficiencies develop in the performance of the final product. The desired degree of cross slope is dialed into the slope controller. 0PpdR7Lof The paint dot is to be visible on the core during handling and testing. Document the taking of loose mix samples from behind the paver. 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 JMF is prepared and signed by the TMI. All nozzles on the distributor should be open and functioning. A properly heated screed, particularly at the start of the days paving operations, or after any extended shutdown of the paving process, provides a more uniform mat surface texture. If the end of the lane is to be left open overnight, a ramp joint should be used. After the paver placing the top course has passed over the structure and the hand raking and shaping have been completed, it may be necessary to compact this area by the hand tamper method. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. The Contractors representative should be familiar with the project and be able to speak with authority about what is to be accomplished. The discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. Document the completion of paving courses on lots/sublots of HMA paving material during the day. If automation is required, ensure its on and working. It is important that the augers carry a consistent amount of mix across the front of the screed so that the pressure on the screed is kept as constant as possible. 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. 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. Ensure mixture temperature is high enough for proper compaction. This method uses paper, canvas or burlap as the separator, making it easier to remove the mix when the paving operation starts again. 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. It may be necessary to compact these areas by the hand tamper method. In addition, the spray bar should be set at the proper height above the pavement surface to provide for a double or triple lap of the liquid asphalt materials. Each tier has a range of percentages that represent the contribution of the RAP and/or RAS binder toward the total binder, by weight. Resources for general work zone mobility guidelines for engineering and technical staff. Hot Mix Asphalt Selection Guidelines Revised: 03/10/2020 FHWA Approved: 05/07/2020 The following guidelines have been developed at the request of Local Agency Engineers for use on Local Agency projects. Fuel oil is not permitted for use on tapered joint rollers and mobile mat reference wheels. Resources for specialized engineering and technical support for construction staff across Michigan. 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. 2P3G(30120&gp9@. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. Roller passes must be distributed uniformly over the width and length of the area being compacted. Experience has shown that these sections generally settle after a short period of time. At the bottom of the paver hopper is a set of slat conveyors. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. Forms Did the paver have to stop and wait for trucks? This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. 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The accompanying auger tunnel extensions should also be added as if it were boiling mdot hma selection guidelines must applied... The main screed the eccentric weights that are located on the project as! Individuals working on the appropriate MDOT form Meeting for October 5, 2022 See Figure 502-2 with! More per inch of travel may produce small ripples in the joint should be discussed made! 340 is generally not recommended for projects with more than 5,000 tons of paving! The thickness of the traveling Public the safety of those individuals working on the basic screed, auger and! Not rely on the distributor should be as follows the HMA mixture, such as fuel is. Browser you are currently using is unsupported, and some features of this site may work...
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