Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. The thickness of the material being placed should be gradually reduced over a distance of 35 feet for every inch of mat thickness, or until the thickness is reduced to the maximum size of the aggregate in the mixture. . The trucks should not be loaded by slowly driving forward while the mix is being delivered from the silo. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. The truck push rollers, located on the front of the paver hopper, are used to maintain contact with the tires of the truck and to push the truck ahead of the paver. It responds to and averages changes in mat elevation in the same manner as the floating beam. Things to look for during the paving operation include: The trucks should be loaded in multiple drops. The mat reference beam is spring supported on a series of wheels that roll on the mat. 4 0 obj Refer to Figure 502-10. The inspector may use the following checklist to record the condition of equipment. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. 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. 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. This equipment must be safe, environmentally acceptable and capable of producing a specification product. Certifications are good for one construction season only. Ensure the bond coat has broken before paving starts. The pressure distributor shall have an automated ground speed control device interconnected with the asphalt emulsion pump in order that the specified application rate will be achieved at any speed. The surfacing or construction traffic shall not be allowed on the existing pavement until the bond coat has cured. 311 0 obj <>stream The tire surface must be kept hot to reduce the pick up of fines from the mixture being compacted. The augers are used to distribute the mixture across the total width of the screed. 2024 HSIP Selection List See Figure 502-3. Easy method to calculate roller speeds for proper Impact Spacing, VPM / Impacts per foot = feet per minute, 2500 / 10 = 250 fpm, 2500 / 12 = 208 fpm, 2500 / 14 = 179 fpm, fpm x 0.01136 = fpm / 88 = mph, 208 fpm x 0.01136 = 208 fpm / 88 = 2.36 mph. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. endstream endobj Contract Administration and Oversight Guidelines for Projects Containing Warranty Work Email this Page Contents 1 All Projects 2 Hot Mix Asphalt (HMA) Paving Projects 3 Concrete Paving Projects 4 Capital Preventive Maintenance (CPM) Surface Seal Projects 5 Documentation and Notifications All Projects Rigid extensions come in several widths, usually 6 inch, 12 inch, 2, 3, and 5 foot sections. After production begins, the Contractor may ask for JMF adjustments. A pass is defined as one trip of the roller in one direction over any one spot. Every year, MDOT produces an updated version of the state transportation map. The base surface (road bed) over which paving is being performed. Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. Refer to Figure 502-13 for some typical mat appearances. endstream endobj Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. xc```b``rAb, B@ @_#Xf.m|yfx gnek%){Us8bm<=cy!M\I3K#b=3%K>[v._tR;yv1'007d`Xl l`1 ^AS40}iV_@xut4CIs2V2,ggtzkT+enF z"$wz You may also contact Ryan Doyle at DoyleR3@Michigan.gov. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. This guidance takes effect as of August 29, 2016. 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). Most paver manufacturers have developed hydraulically extendable screeds that trail the main screed on the paver. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. Bond coat shall be applied to the taper before the adjacent lane is placed. After curing, only traffic essential in the work should be allowed on the bond coat. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet Thus, the amount of mixture that can be carried back to the augers on one side can be different from the other side. FY 2022 Project Planning Guide The temperature should be checked immediately. The purpose of the shoes is to allow one or more of them to pass over a high or low point in the existing surface without altering the slope of the whole beam. Projects constructed under a warranty special provision still require inspection staffing and complete documentation prior to payment, including MDOT materials certifications, MDOT yield checks, MDOT quantity measurement, and MDOT Inspectors Daily Reports. Risk analysis is specifically used to select appropriate performance standards for various bridge . Most drum mixer plants heat the aggregate, add the asphalt cement and recycled asphalt pavement (RAP), if used, and mix all the ingredients in the same drum. Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022 All roller marks should be removed by the finish roller. The rollers behind the first paver should stay 1 foot away from the free edge toward the second paver. 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. This article returns the responsibility for these tasks to MDOT for all concrete paving projects, including those that contain special provisions 03SP602A and/or 03SP602E. Project mixture and testing Special Provisions. The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. The first is the frequency of vibration and the second is the amplitude of the compactive effort. Yield = 93920 pounds/561.33 square yards= 167.3 lbs/square yard. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. If this yield is found to be high or low from that specified on the plans, a slight adjustment of the thickness controls should be made and the yield rechecked. U@A#8TEtAr]wWxazj+%=[,dM,MAg/z{F }G=lNPjeG&Pku,T]cXQo &gnXKIZEmCK0&9?l 1l| 3]B]C*hv K65 Communication cannot stop once the pre-production meeting is concluded. Laying out core locations, discuss how it will be done. This should be checked using a straightedge or string line. If aggregates larger than what is required for mix design still exist after processing, the contractor must demonstrate that additional screens are installed on the RAP feed system 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. If segregation is observed, the paving operation should be stopped until the problem is corrected. This equipment should be thoroughly checked before using it on the project. To reach the required density, the quickest initial compaction should occur directly behind the lay down machine. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. These adjustments may be allowed if there is reason for the request and as long as the resulting mixture meets the specifications for the project. Some pavements may be disintegrated so badly that the fragments may have to be removed. Shoulder samples shall be taken if RAP from shoulder is to be used. At relatively slow paving speeds, it might be possible to make the truck exchange while keeping the head of material constant. Resources for MDOT real estate standards, policies and procedures, and training. The tire pressure used depends, in part, upon the number of plies used in the tires. Field experience and test data have shown that a vibratory compactor will produce required density in fewer passes than a static roller, while moving at a slower speed. MDOT provides technologies and partnerships in order to make the transportation system safer and less congested. 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. Does the distributor have a capacity of at least 800gallons (3,000 liters)? A diagnostic guide is included here to help in identifying the cause and fix for a range of segregation problems. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. It is MDOTs responsibility to conduct quality assurance and verification sampling and testing to ensure conformity of the mix to 20SP501(R) Superpave Hot Mix Asphalt Percent Within Limits (PWL) or 20SP501(S) Superpave Hot Mix Asphalt Percent Within Limits (PWL) For Capital Preventive Maintenance (CPM) Mill & Resurface Projects and CPM One Course Overlay Projects.This testing is done at the field laboratory provided by the Contractor located at the asphalt plant or at an MDOT Region Lab. If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. 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. Care should be taken to avoid overheating, which can cause permanent warping of the screed. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. It spans from northern Canada to Mexico near the equator. Every HMA paving project must have an approved mix design for each mixture used on the project. The tiers identified below apply to Superpave The adjacent pavement, curb, or curb and gutter, shall be replaced to the original elevation, condition and type of construction, unless otherwise provided. endobj Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. There are many common myths and misconceptions about transportation in Michigan. A paving schedule for the project should be presented and discussed with MDOT. Surface defects are problems that occur in the asphalt mixture during, or soon after, the lay down and compaction process. Requesting a ProjectWise Folder, Ryan Doyle, P.E., Supervisor, 989-220-9447, Michele Zawerucha, Project Development Engineer, 517-335-0878, Urban Area Staff Engineer Contact Information, Instructions for Preparing to Bid Federal Aid Projects Through MDOT Did you know that millions of people visit the Great Lakes State every year? 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. Visible light blue emissions from the stack may indicate that the temperature of the gases inside the drum is too high and may be causing damage to the asphalt cement. All nozzles on the distributor should be open and functioning. 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. This information must be detailed and complete. The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. If a hydraulically extendable screed is to be used at a fixed width for a period of time, the paver should be equipped with auger extensions to within 12 inches of the end gate. ECA Self-movable mobile plant. Distributor Checklist - Manufacturer and Distributor Number -______________________________. This is caused by an improperly adjusted screed angle of attack. 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. A notch of up to 1 inch shall be placed at the top of the taper when placing HMA. Ensure the surface is cleaned of all dust, dirt and other debris. 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. 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. The inspector should also check the structure to determine that the casting is firmly set in place. Multiple drops of the mix are necessary. The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). During this meeting, the overall goals and expectations are set for the project. 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 certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. The department also produces numerous geographic information system maps to assist commuters, tourists, and businesses. It covers all or parts of 13 states in the US and five provinces or territories in Canada. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. This skirt will help keep the tires hot by holding the heat from the mix under the roller. When cold-milling by the ton is a pay item, a weigh person will be needed. One procedure should constantly be followed: if in doubt about whether the information is important or beneficial, write it down. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. Are guards placed on end of spray bar to protect over spray where necessary? A list of equipment that will be used on the project should be supplied to MDOT. Forms Before the automatic screed controls are engaged, the screed must be nulled before paving starts and the proper angle of attack must be set. of seven wheels? \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 It can also be provided by the TMI. FY 2024 Webinar Recording The operator should not make manual changes while automation is working. The auger and the slat conveyor on the same side must be operated together. 80 to 150 m 3 /h If the automatic controls are being used, the screed operator should not try to change the screed manually by turning the thickness control crank. One type of reference device, termed a floating ski or beam, is a series of feet, or shoes, attached to the bottom of the floating beam. At the bottom of the paver hopper is a set of slat conveyors. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. This hitch acts to keep the truck in contact with the paver to prevent the truck driver from inadvertently pulling away from the paver and dumping mix on the pavement in front of the paver. The roller should not sit and wait on the hot mat. In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. Conventional stream Check the mixture thickness, or yield, within the first three truckloads. The flow gates should be adjusted to provide a uniform head of material in front of the screed. 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. <> 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. Samples to be taken a minimum of every mile in each lane by milling or coring. 26.65 (b) is still subject to the 3-year gross receipts average. A porous surface texture may require the maximum rate, whereas a smooth, glazed surface would require a minimum amount of 0.05 gallons/square yards. The joint is swept clean of all loose material and given a bond coat. The office also works directly with legislators' offices regarding state and local transportation constituent concerns. %PDF-1.5 % A result of specified mix contaminated with inferior performing, non-specification mix. This section is to remind construction staff of warranty inspection, documentation, and contractor notification requirements. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. A sublot is defined as 1 mile for this example of in-place 12 foot wide pavement. Care should be taken to neatly construct the joint at a right angle to the centerline of the roadway. The JMF is prepared and signed by the TMI. This check is done by roughly measuring the area covered by one truckload; the tonnage placed is known from the load ticket. The field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). 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. In general, the vibrators should be used near the maximum possible frequency. The Contractor will use several types of rollers and each type is used for different purposes. Pavement sags and rough areas may require a wedging course. 309 0 obj <> endobj 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. Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. 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\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}} . The grade sensor usually rides directly on the beam at its midpoint. This mark can easily be eliminated by adjusting the elevation of the extendable screed in relation to the main screed. See Figure 502-6. 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. These adjustments should be completed within the first two loads placed. This requires a HMA layer of varying thickness to be placed and is referred to as wedging. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. 1 0 obj Flexible Pavement: Density is required across the full pavement width. 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. See Figure 502-2. Some pavers may be equipped with augers that extend automatically as the screed is extended. Material Quality. endstream endobj Mixture, if left to stand for a long time in the corners of the hopper, will cool. This will help ensure that sampling technicians for the project are formally qualified by the department. Bond coat material must be applied with an approved distributor with a uniform spray. The rolling zone is the distance behind the paver where the breakdown roller operates. Attention needs to be directed toward joints more than any other phase of HMA construction. The Michigan Department of Transportation (MDOT) is responsible for Michigans nearly 10,000-mile state highway system, comprised of all M, I, and US-routes. CSD advertises all MDOT TPSSB A/E projects in excess of $200,000 to solicit Consultant Expressions of Interest. 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. The typical equipment used: Used for cleaning the old surface to be paved. Do all trucks have working backup warning systems? The desired degree of cross slope is dialed into the slope controller. When the paving operation is discontinued, a transverse joint must be constructed. Any dust and dirt left on the milled surface will greatly affect the bond between that course and the new overlay. At a minimum, all repairs shown on the plans shall be completed. Weather and air temperature requirements. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Once the Contractor has finished the rolling operation, the inspector will identify the locations where the density cores will be taken; these locations are randomly selected both longitudinally and transversely. Unsere Bestenliste Jan/2023 Detaillierter Produktratgeber TOP Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen. No raking of the joint is needed. Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. Resources for local governmental agencies that regularly require access to state right of way. x 0 ;r0Do9r\( [v9pWnY?xF 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). 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