The Contractor would then correct the problem and show that a uniform application can be made before being allowed to continue paving on the project. Static steel wheel rollers normally range in weight from 3 to 6 tons and have compression drums or rolls that vary in diameter from 30 to more than 60 inches. The haul trucks and all paving personnel must keep away from the line and not disturb it in any way. FY 2023 Project Planning Guide If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. This procedure will minimize the change in forces acting on the screed and will result in a near-constant mat thickness. 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. Selection of appropriate pavement marking materials (paint, thermoplastic . x\Yo~'08>0@SClr~PdZ`ZOUuwu.w9b?Q=3:|w/>_owW>}WO.@EsG}9='__?SyDSm[k}>0 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. All nozzles on the distributor should be open and functioning. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. Adjustments to the JMF will not be allowed outside the mixture limits shown in Tables 501-1 and 501-2 of the Standard Specifications for Construction. Pavement sags and rough areas may require a wedging course. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. This information must be detailed and complete. 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 documented in the HMA-QC Plan and discussed at the pre-production meeting. The Contractor will use several types of rollers and each type is used for different purposes. 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 Communication cannot stop once the pre-production meeting is concluded. 2.5 HMA or WMA, HT (19 mm MIXTURE) Polymer Modified (1 @ 2.5) 3 HMA or WMA, HT (19 mm MIXTURE) (1 @ 3) 6 Lime Fly Ash Treated Granular Material (9/C) 13.5 Structure Thickness 6 Chemically Treated Subgrade 7 Shoulder Granular Material (5/C) Multiple lifts of 9.5 mm HMA/WMA should be avoided. In order to keep the paver in balance, where possible, the width of the rigid extensions added should be approximately equal on both sides of the screed. Document the taking of loose mix samples from behind the paver. Rigid extensions come in several widths, usually 6 inch, 12 inch, 2, 3, and 5 foot sections. This guidance takes effect as of August 29, 2016. MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. The HBCU TDRP is a unique partnership between MDOT and Michigan colleges and universities to offer on-the-job training to undergraduate students pursuing degrees in engineering or transportation-related careers. Ensure mixture temperature is high enough for proper compaction. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. Hand raking and shaping around the cover must be completed before the material cools. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. The inspector should check the placement yield occasionally. FY 2022 LAP Bridge Scoping Estimate Key The inspector should contact the Region HMA inspector for guidance. Figure 502-11 illustrates the wedging process. This should be checked using a straightedge or string line. The tiers identified below apply to Superpave The length of temporary taper shall be 5 feet for each inch of mat thickness. There are many common myths and misconceptions about transportation in Michigan. Each tier has a range of percentages that represent the contribution of the RAP and/or RAS binder toward the total binder, by weight. 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. While the paver is operating, laborers may work, or rework, a portion of the mix to fit the paving around objects and to fill in areas that the paver does not pave adequately, or cannot reach. The finished mat should be smooth and free of blemishes. The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be thoroughly cleaned. If the aggregate surface is left exposed to the weather, either allowed to dry out or become saturated by rain, sufficient tests must be made immediately prior to placing the mixture to ensure that density requirements are met. 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. Depending on the material and job conditions, this can be quite dramatic. This equipment should be thoroughly checked before using it on the project. The auger and the slat conveyor on the same side must be operated together. 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. The amount of crown that can be introduced into the screed varies with the width of the basic screed and with the make and model of the equipment. This process will be repeated for additional samples. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. 311 0 obj <>stream The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. <>/Metadata 445 0 R/ViewerPreferences 446 0 R>> 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 Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. The rolling zone should be kept as short as possible. This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. 2 0 obj The field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). MDOT's seven region offices each handle transportation-related construction, maintenance and programs within the region's geographic boundaries. Deviations in the pavement surface are averaged out over the length of the grade reference device. The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. 109 0 obj <> endobj 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. If the automatic controls are being used, the screed operator should not try to change the screed manually by turning the thickness control crank. There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. FY 2025 Local Bridge Program Call For Applications - Due April 2022 If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. The roller pattern should be set up as soon as paving starts. Thus, the amount of mixture that can be carried back to the augers on one side can be different from the other side. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. All roller marks should be removed by the finish roller. The discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. The elevation of a fresh mat in relation to the base. Can speed be locked in on vibratory rollers? Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. After production begins, the Contractor may ask for JMF adjustments. Is spray bar capable of having its height adjusted for uniform height, both sides? 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. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. The top course will then be placed at a uniform rate. Hand tools, level, straightedge and boards. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 FY 2024 HSIP Streamlined Systemic Application These trucks are loaded in the same manner directly from the silo at the plant. Refer to Figure 502-15 for details of joint construction. See Figure 502-2. Because continuity of the asphalt paving operation is critical to providing a quality pavement, the discussion between MDOT and the Contractor personnel should include such items as those listed below. For this system, a feed control sensor is used to determine the amount of mix in the auger chamber. Material Quality - Resources; Material Quality Partnering Meetings. Vibratory rollers come in a variety of configurations. 2023 Streamlined Systemic HSIP Selection List Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. These tears are usually caused by improper paver condition, or operation, by cold mix, and by attempting to lay a mat too thin compared to aggregate size. A paving schedule for the project should be presented and discussed with MDOT. 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. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. Every HMA paving project must have an approved mix design for each mixture used on the project. 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. The slat conveyor on one side operates independently from the movement of the other side. Be in good condition with no holes or tears. Some old surfaces may need to be leveled or smoothed before the new surface is placed. Ride Specification provides guidance to using the Pavement Surface Profile. 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. A specified number of samples are to be taken from each sublot. Contract Plans Specify 165 pounds/square yard. Never empty the paver hopper while paving. The inspector should check the entire pavement surface to ensure that all corrections are made before resurfacing work begins. 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. Ideally, these meetings should occur at a regularly scheduled time and can be held on the project site, or at the asphalt plant. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. If the extensions on the extendable portion of the screed are not properly aligned with the main screed, a longitudinal mark, or ridge, will occur in the surface of the mix at the junction between the two screeds. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. Resources for local governmental agencies that regularly require access to state right of way. In the surface course, the entire affected area should be removed promptly and sufficient new material placed to form a true and even surface. 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. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. A notch of up to 1 inch shall be placed at the top of the taper when placing HMA. 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. 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. Adequate compaction of the mix increases the pavement life, decreases permanent deformation, reduces oxidation or aging of the asphalt binder, decreases moisture damage, increases strength and stability and decreases low temperature cracking. Bond coat material must be applied with an approved distributor with a uniform spray. 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. Typically, the string is supported on metal posts at 25 foot intervals. After curing, only traffic essential in the work should be allowed on the bond coat. ?,E_Bs>B~Ke?Ltqv`K?7GT=?e{T.gJu08!RmK?>\TG>X*zsK>C/>RXKG9>DOcpbcc?~JvGp_dfXq1]=K57:To dr>I7|IT3E?K8C.C i>Jspv0phJvpv@!C],U)BZ9**#"52pODGJ)E2A@oq )N-?Ihr>jcvM2}czL=NwX]QD;vu;djZkSLpX\w]>4t7~~}>kzr}^a{~cW/juWQ1fwH0?c:@ ^ ^ thI9#~wLH0]=.DEe4k;kR/_w\W]6xLK} 1Gp=azK%Ad/?t-[3)3x!Kyho6pkF1?Q!+]P#6Nt|ioF7K{O^j5[5U=uFh=tq-17|~%{knFic7'Fz]T^Ukkk}g[ L o.yhyKRr+a'oE. The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. Plan the width of application to ensure having bond coat under the matching longitudinal joint. endobj 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. Mountain Standard Time is the second westernmost time zone in the United States and Canada. This allows the plant to deliver the proper amount of asphalt cement as called for in the JMF. If it is below the specification limit, 250F, it should be discarded. In the event that an inspection is not completed prior to the expiration of the warranty, it is the departments responsibility to ensure that the inspection still takes place; however, this inspection should be completed only with MDOT forces. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. %PDF-1.5 % 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}} . 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. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. The office is responsible for media relations, social media, and website development. Weather and air temperature requirements. Every year, MDOT produces an updated version of the state transportation map. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. It is very important to know what special provisions are contained in the proposal. Grey goos vodka - Der Gewinner . Advisories Pressure distributors are used to apply a uniform application of the asphalt emulsions, normally referred to as the tack or bond coat. Stopping the paver and allowing the screed to settle into the mat. The distance between the end of the auger extension and the end gate should be about 12 inches. 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. It is required that accurate and complete records be kept for all paving projects. The aggregate used to make the mix can be a single aggregate, but it is generally different sizes blended together through the cold feed bins to produce proper gradation. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. 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 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. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Shoulder samples shall be taken if RAP from shoulder is to be used. The certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. Irregularities in the lower courses can usually be corrected by removing or adding material. 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. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. There are two basic types of asphalt mixing plants. An asphalt mix that has all the desirable mix design characteristics will perform poorly, if not compacted to the proper density. The stockpiles shall be large enough to supply a project continuously and consistently. These gates are used to regulate the amount of mix that can be delivered by the slat conveyors to the augers. 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). Ensure the surface is cleaned of all dust, dirt and other debris. These guidelines will be incorporated into the next version of the HMA Production Manual. Every individual should know what is expected and know how to perform the assigned tasks. }szvn?w -L7C#qV_?[tp}Ts E[3M;oW|90}!v$z3* Does the distributor have a capacity of at least 800gallons (3,000 liters)? Once this has been done, complete the rolling of the joint. See Figure 502-12. *If approved by the engineer, in line crushing and/or screening will be allowed in lieu of processing RAP into a stockpile. Figure 502-16 shows an example of a coring documentation form. 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. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. endstream endobj The paver consists of two primary parts, the tractor unit and the screed unit. Secondary Route Bridge Design Plan Guides 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. %PDF-1.5 % Rakes, shovels and lutes are frequently used by personnel around the paver. Is heating system in good working condition? Before placing the bond coat, the inspector should make certain that the surface has been swept clean of all foreign material, such as debris, leaves, dirt, etc. A3M+<9HWZ+sFW4vKjfMQ"Lk U.c~TMm:YN u3lS( I1$3vsf 02U^0T[H 4n GI_}M&=MbAcL#' Z9[iW:hF-0T@4fbiB#1e7ME B? 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. Slick, highly polished surfaces, potholes, old patches, cracks and joints may require repairs. Mixture temperature should be checked regularly when the mix arrives on the project and recorded on the load tickets. This will happen on windy days and when the mat thickness is thin, normally the wearing course. FY 2024 Electronic Application Submittal Form FY 2013 Before and After Crash Study Of sufficient weight and strength to resist tearing. Are the mats or wheel scrapers in good operating condition? The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. Permits and Utility Coordination Avoid spraying adjacent completed surfaces that will remain exposed. 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. Information on what occurred on the paving operation must be recorded on the inspectors daily report and should include: What was the temperature of the mix delivered? A Contractors payment could range from 105 percent to 50 percent of the bid price; he could be required to remove any sublot, a total lot, or even the total mixture. Public participation is integral to efficient, effective and responsive transportation decisions. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam.
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