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 When one truck is emptied, it should pull away from the paver. Public Notice of North Region Bridge Council Meeting for September 22, 2022 Long and short waves can be caused by a fluctuating head of material in front of the screed. The screed on the paver can be angled at its center to provide for positive or negative crown. In the surface course, the entire affected area should be removed promptly and sufficient new material placed to form a true and even surface. Before overlaying the old pavement, it should be inspected. 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. This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. In the longitudinal direction, the rollers should not stop at the same transverse end point with each pass of the roller; the reversal points should be staggered to prevent shoving of the mix. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. Several different organizations publish short, concise safety presentations that can be completed in two to three minutes. Weather and air temperature requirements. Did the paver have to stop and wait for trucks? Risk analysis is specifically used to select appropriate performance standards for various bridge . If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. This checklist may be placed in the project files. 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 paver consists of two primary parts, the tractor unit and the screed unit. 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. 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. 0PpdR7Lof The last meter of the HMA material should be raked and all the large stones removed, leaving the fine material. 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. The aggregates are then proportioned by weight into the mixer, also called the pug mill. For relatively thin layers of mix, generally less than 1-1/2 inch, the vibratory roller should typically be operated in the static mode. To preheat the screed, the heaters are normally operated for a period of 10 minutes to 20 minutes before the commencement of the paving operation. The breakdown roller should be as close to the paver as possible. Refer to the AASHTO Roadside Design Guide and the MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for additional . The thickness of each course generally should not exceed 3 inches. 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. Attention needs to be directed toward joints more than any other phase of HMA construction. After a short mixing process, the asphalt cement is added and the entire mixture is mixed for 30 to 45 seconds. 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. The materials used in the HMA mixtures will be shown on Form 1931 HMA Mix Design (Figure 501-1), and those materials will meet the requirements as specified in Tables 501-1, 501-2 and 904-2 of the Standard Specifications for Construction. MDOT's A/E internal guidelines, and federal laws and regulations. %PDF-1.5 % Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. The inspector should check the entire pavement surface to ensure that all corrections are made before resurfacing work begins. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) Hand tools, level, straightedge and boards. Once the pavement has dried, multiple passes of a mechanical broom are needed to remove all the residual grit from the milled surface. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. The mix may also foam so that it appears to have too much asphalt. MDOT provides technologies and partnerships in order to make the transportation system safer and less congested. Common Safety Countermeasures for Local Agencies for Peds and Bikes Refer to Figure 502-13 for some typical mat appearances. The office also works directly with legislators' offices regarding state and local transportation constituent concerns. Thus, the amount of mixture that can be carried back to the augers on one side can be different from the other side. Bond coat material must be applied with an approved distributor with a uniform spray. The length of temporary taper shall be 5 feet for each inch of mat thickness. Each type of reference can be used on either side of the paver, or on both sides at the same time. Bridge railings and piers, curb and gutter pans, and guardrails must be protected from the spray of bond coat by the use of shields. Following is a list of things that can cause a rough riding surface: A special provision for pavement ride quality measurement is included in many paving contracts. These guidelines will be incorporated into the next version of the HMA Production Manual. The top size of the top scalping screen shall be 1.5 for top and leveling courses and 2 for base courses. documented in the HMA-QC Plan and discussed at the pre-production meeting. 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 Plan the width of application to ensure having bond coat under the matching longitudinal joint. Thus, the samples will be taken at 1985 and 6.3 feet from the beginning of the pavement. 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. Transverse screed marks are transverse indentations in the mat, which may occur when the paver stops between truckloads. Final Report Part 3 The final step before the bond coat is applied is to thoroughly clean the existing surface by brooming and/or other methods; all vegetation and debris must be removed from pavement joints and cracks. Do pneumatic rollers have a min. Sampling methods and frequencies should be discussed. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. This nonuniform texture can be caused by many factors: screed extensions not level with each other, running the hopper empty between trucks, unevenly worn screeds, cold mix, or improperly emptying the paver wings. 2 0 obj It is very important to know what special provisions are contained in the proposal. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. Can speed be locked in on vibratory rollers? Any severely spalled areas at joints should be repaired using partial-depth repair methods. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. 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. endstream endobj All roller marks should be removed by the finish roller. A list of equipment that will be used on the project should be supplied to MDOT. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Flexible Pavement: Vibratory rollers do not have to roll rapidly to maintain production on the job. All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. Aggregate is generally sized by means of a screen deck into two to four of these hot bins. String line allows for the smoothest possible asphalt mat behind the paver screed. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. Laying out core locations and traffic control for coring. 2023 HRRR Selection List, Highway Safety Manual (HSM) Process Selection. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. Selection of appropriate pavement marking materials (paint, thermoplastic . Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. The paver speed has a major effect on the forces acting on the screed. Ensure the bond coat has broken before paving starts. It is also used in Mexico. The desired degree of cross slope is dialed into the slope controller. 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. The surface can have two types of waves: long waves and short waves. FY 2025 Local Bridge Program Call For Applications - Due April 2022 An approved grade referencing attachment, not less than 30 feet in length, may be used. 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 If the wedging is greater than 3 inches, two courses of HMA mixture may be required. 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. FY 2024 Webinar Recording The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. Road Safety Audit The first yield check should be made as soon as the Contractor has completed all paver adjustments. Contract Plans Specify 165 pounds/square yard. 2P3G(30120&gp9@. 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 field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List 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. All traffic must be kept off of the bond coat until it is cured. During this meeting, the overall goals and expectations are set for the project. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. It shall be capable of maintaining the asphalt emulsion at the specified temperature. Adjust catch basins after the leveling course has been placed. Sampling frequency required is based on the percentage/tonnage of RAP that will be utilized on the project. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. 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 Contractor would then correct the problem and show that a uniform application can be made before being allowed to continue paving on the project. Bleeding (flushing) occurs when the asphalt cement comes to the surface under traffic. Too Hot: Blue smoke rising from the mix usually indicates an overheated truckload. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. Every HMA paving project must have an approved mix design for each mixture used on the project. A release agent may be applied to the surfaces of the truck or trailer bed. 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. Some pavements may be disintegrated so badly that the fragments may have to be removed. Are the water sprinklers in good operating condition? 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. Modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has offer! 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