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. Providing the highest quality integrated transportation services for economic benefit and improved quality of life. 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. B. The inspector should contact the Region HMA inspector for guidance. Are the water sprinklers in good operating condition? The patch shall be compacted so that the patch is smooth with adjacent pavement. Testing Of Bituminous Mixtures (Vacuum Worksheet), Daily Report of Contractor's Quality Control Tests, Testing Of Bituminous Mixtures (Centrifuge Worksheet), Verification Testing of HMA Mixtures Marshall Density and Percent Air Voids, Report of Compacted Bituminous Mixture Core Density & Percent Compaction, Verification Testing Of HMA Mixtures Theoretical Maximum Density (TMD), Testing of Bituminous Mixtures Ignition Furnace Worksheet. The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. 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. Once the proper yield has been obtained, only periodic checks will be required each day. At the bottom of the paver hopper is a set of slat conveyors. endobj 2023 Streamlined Systemic HSIP Selection List Consultant Selection A pass is defined as one trip of the roller in one direction over any one spot. Any questions about the information in the contract documents should be raised and clarification requested, if necessary. 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. This leveling device is attached to the tractor unit at only one point on each side of the paver; it is able to float on the asphalt mixture and to provide initial mat texture and compaction to the material as it passes under it. The uniformity of the roller passes is just as important as the number of passes. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. It responds to and averages changes in mat elevation in the same manner as the floating beam. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. Do pneumatic rollers have a min. 80 to 150 m 3 /h Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. FY 2022 LAP Bridge Scoping Cost Estimate Worksheet Many pavers are equipped with a truck hitch that is located beside the push rollers. Pavement Type Selection Process; Ride Specification . {7:r!> -)t=:NuL5oqba5q]oe`0jC x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l Plan Approval. The rollers vibratory frequency should match its travel speed. endstream endobj MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List Once the truck bed has been emptied of mix, the truck hitch is withdrawn and the truck is able to pull away from the paver. Rigid extensions come in several widths, usually 6 inch, 12 inch, 2, 3, and 5 foot sections. This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. 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. Other surface blemishes are caused by the truck backing into the paver, the screed settling when the paver stops and when the paver operator empties the hopper wings into an empty hopper. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Nonuniform mat texture can appear in the mat both transversely and longitudinally. The auger on each side of the paver is operated independently of the other. Do all trucks have working backup warning systems? The screed is attached to the tractor unit at only one point on each side of the paver. 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? Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. 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. In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. 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 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. The bond coat material must be applied with an approved distributor with a uniform spray. For relatively thin layers of mix, generally less than 1-1/2 inch, the vibratory roller should typically be operated in the static mode. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. 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. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. Public Notice of Superior Region Bridge Council Meeting for September 23, 2022 I3 Q[LSP'@Df]]nt .Q1-^zAi"AN|.Tc This is helpful at lane tapers, crown corrections, or in areas of wedging. There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. Hand raking and shaping around the cover must be completed before the material cools. Refer to Figure 502-15 for details of joint construction. A release agent may be applied to the surfaces of the truck or trailer bed. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. The desired degree of cross slope is dialed into the slope controller. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. The sides, or wings, of the hopper are movable. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. 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. This will help ensure that sampling technicians for the project are formally qualified by the department. Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. All traffic must be kept off of the bond coat until it is cured. tf@ciT$`|ntC62(t;p_XN(eM1$ONC8C8:LsA){#lt,:Gb{.mGjN,gVJeBm8Vs= The HMA mixture used for patching should be the top course mixture called for on the plans, or in the proposal. Mixture types to be used and the sampling and testing procedures vary depending on the specifications used. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). icPUBJ FP rM4"d_`Sx".HCaM;)v}khmqj*KDRu`JK*l*fiEpg[`+H9g@ Ct)L;9BnLjvJdQP7BHD#},i-7D4lPNy`B_]Z)Hg BWPl!3I8"#wQjBANtNV #P9!#)C6.q]BX9#mCw The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. The asphalt cement delivery system must be calibrated. The auger and the slat conveyor on the same side must be operated together. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. The taper shall be constructed by the use of an approved strike off device attached to the screed that will provide a uniform slope and will not restrict the main screed. Bond coat shall be applied to the taper before the adjacent lane is placed. 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. Does the Contractor have proper number of rollers? A sublot is defined as 1 mile for this example of in-place 12 foot wide pavement. Be in good condition with no holes or tears. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. Final Report Part 3 The important part to remember is that although it rolls slower than a static roller, the vibratory machine can usually economically reach specified density with fewer passes. 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. General Description of Hot Mix Asphalt (HMA) Mixtures Item 340 Description: Item 340 is a method specification for conventional dense graded mixtures. This is a certified product and the suppliers must be on the Certified Products List. Are the king bolts in good condition on steel wheeled rollers? endstream endobj MDOT provides funding for competitive grant and loan programs primarily, but not exclusively, for state and local road agencies for the greatest impact on economic development and job creation. 310 0 obj <> endobj 312 0 obj <>>>/Contents 313 0 R/StructParents 0/Tabs/S/CropBox[ 0 0 612 792]/Rotate 0>> endobj 313 0 obj <>stream This document replaces the previous edition of the guidance, published in 2009. Resources for the development of quality transportation project documents and services. Material Quality. 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 Public participation is integral to efficient, effective and responsive transportation decisions. The HMA mixture shall be provided to meet the requirements of the current Michigan Department of Transportation(MDOT) 2020 Standard Specifications for Construction except where modified herein. A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. This will happen on windy days and when the mat thickness is thin, normally the wearing course. The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. 30 to 120 m 3 /h; EBA Mobile plant for medium productions. Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. Ensure the bond coat has been applied uniformly at the proper yield. It is also used in Mexico. The screed of the second paver must be set at the same level as the screed of the first paver; this will prevent the screed of the second paver from dragging on the mix placed by the first paver. Before overlaying an old HMA pavement, it should be inspected. 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. 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. . The surfacing or construction traffic shall not be allowed on the existing pavement until the bond coat has cured. Certifications are good for one construction season only. All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. 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. Public Notice of Metro Region Bridge Council Meeting for September 28, 2022 This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. NEPA Guidance Keep the level of mix at the augers as uniform as possible. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. Multiple drops of the mix are necessary. Is the automation ski of proper length 30 feet +/- for all courses except last pass top course? After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. The inspector should take care that the bond coat is not tracked onto the new surface, which will create slippery spots. %PDF-1.7 % The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. This type of reference device is used only when the grade being sensed is relatively smooth. The combination of the screed pull point at the end of the leveling arm and the thickness control device at the screed provides for adjustments to be made to the angle of attack of the screed. 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. It is very important that proper air pressure be maintained in all tires. 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. 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. Select all. After a short mixing process, the asphalt cement is added and the entire mixture is mixed for 30 to 45 seconds. Every year, MDOT produces an updated version of the state transportation map. Joints that are poorly sealed should have the old seal material removed and the joints cleaned. Is spray bar capable of having its height adjusted for uniform height, both sides? Improper adjustments of catch basins can create drainage problems, which will lead to early deterioration of the roadway. 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. Determine the length of one pavement representing a sublot of material, the width of the pavement and the number of samples, (n), needed for each sublot. See Figure 502-4. Can VPM be locked in on vibratory rollers? The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. Mixture temperature should be checked regularly when the mix arrives on the project and recorded on the load tickets. Bond coats may be considered cured when your shoes tend to stick without picking up material when walking over it. Do the rollers have an operating warning light? Two factors within the screed itself can contribute to the degree of compaction. The pattern of segregation can normally identify the cause of the segregation. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Mountain Standard Time is the second westernmost time zone in the United States and Canada. 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. Common Safety Countermeasures for Local Agencies for Peds and Bikes This is why it is important to set the flow gates properly, keep the slat feeders operating uniformly, keep a uniform head of material in front of the screed and not overcontrol the screed. 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. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. Never empty the paver hopper while paving. stream HMA mixtures consist of a blend of asphalt binder and aggregates mixed in an asphalt plant. The roller should not sit and wait on the hot mat. To reach the required density, the quickest initial compaction should occur directly behind the lay down machine. If two pavers running in echelon are used, the construction of the joint is similar to the building of a joint against a cold compacted pavement. The people most likely to be hurt on an asphalt paving project are those individuals who are new to this type of work. The office is responsible for media relations, social media, and website development. A specified number of samples are to be taken from each sublot. 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. 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. Each MDOT region has several Transportation Service Centers (TSCs) that are designed to respond to the transportation needs of local communities. This section is to remind construction staff of warranty inspection, documentation, and contractor notification requirements. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. The thickness of each course generally should not exceed 3 inches. Unsere Bestenliste Jan/2023 Ultimativer Produktratgeber Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen. Attach copies of the qualification documentation for the sampling technician to the preproduction meeting minutes for each HMA paving project where HMA sampling is required. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. MDOT's A/E internal guidelines, and federal laws and regulations. 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 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. All things related to pavement engineering. Some pavers may be equipped with augers that extend automatically as the screed is extended. When the paver stops, do it as fast as possible. 26.65 (b) is still subject to the 3-year gross receipts average. Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 Vegetation and debris should be removed from joints and cracks. Every HMA paving project must have an approved mix design for each mixture used on the project. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. Do extensions have proper vibratory action? Occupational Safety and Health Administration regulations must be known, understood and followed by each person involved on the project. The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. Custom boutique photography for newborns, children, families, seniors, and weddings Living Snow Fence, Fiscal Year Obligation Reports From 30 to 100 m 3 /h; MODULMIX Plant for large productions and special concretes. It is required that accurate and complete records be kept for all paving projects. No raking of the joint is needed. 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. Screed plates first wear out about four to six inches from the trailing edge. 30 to 70m 3 /h; EMA Compact plant, perfect for prefabricated. Irregularities in the lower courses can usually be corrected by removing or adding material. Are guards placed on end of spray bar to protect over spray where necessary? This article returns the responsibility for these tasks to MDOT for all CPM surface seal projects, including those that contain 03SP505A, 03SP507A, 03SP508A, or 03SP508C. 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. At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. In general, the vibrators should be used near the maximum possible frequency. Most of our manuals, publications, and forms are available online. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. Plants are certified in accordance with the HMA Production Manual. Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. 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. Pavement sags and rough areas may require a wedging course. 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. All roller marks should be removed by the finish roller. In addition, a RAP scalper screen is required**. 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. In front of the paver on a straight line of travel questions about the information the! 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