The degree of preparation depends upon the condition of the existing surface. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. The asphalt cement delivery system must be calibrated. Public participation is integral to efficient, effective and responsive transportation decisions. Transportation System Performance allows MDOT's regions and engineers to expand their knowledge on how Michigan freeways are operating over time and how they compare to each other. The MDOT plant inspector should follow the sampling and testing procedures explained in the Special Provision 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. stream
There should be enough trucks to provide a continuous flow of mix to the paver. 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 joint is swept clean of all loose material and given a bond coat. [v2pBT9V9Y$Zq[Uh q91Ok6b
dES 0k$#ti@o8pj#da*4mq9ZZz3WKI!VNTPkpcZ` A diagnostic guide is included here to help in identifying the cause and fix for a range of segregation problems. Shoulder samples shall be taken if RAP from shoulder is to be used. 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. Samples shall be taken if visual observations show significant variations in existing pavement mat. The initial acceptance form, contained in the contract documents, is to be filled out when the warrantied work has been completed and accepted. The auger on each side of the paver is operated independently of the other. Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. 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. 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. There are many common myths and misconceptions about transportation in Michigan. The tractor unit is powered by its own engine and provides the power to move the paver forward, either on rubber tires, or crawler tracks. 80 to 150 m 3 /h Living Snow Fence, Fiscal Year Obligation Reports I3 Q[LSP'@Df]]nt .Q1-^zAi"AN|.Tc See Figure 502-7. Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. Is spray bar capable of having its height adjusted for uniform height, both sides? This is caused by an improperly adjusted screed angle of attack. 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. 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. Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. 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 front of the hopper must be constructed in a way to minimize the spillage of mix from the hopper. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. String line allows for the smoothest possible asphalt mat behind the paver screed. The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. When the paving operation is discontinued, a transverse joint must be constructed. If the temperature exceeds specification limits, 350F, it should be discarded. Does the paver have reverse pitch augers or paddles at center of paver? Ensure mixture temperature is high enough for proper compaction. 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. Moreover, if one roller rotates freely and the other does not, the paver may tend to change direction. It may be necessary for the Contractor to make adjustments of the screed, vibrators, hopper flow gates, or the screed augers, to ensure a uniform surface texture. Compaction must be achieved while the stiffness of the mix is low enough to allow for reorientation of the aggregate particles under the action of the rollers. Pavement density control, roller patterns. A specified number of samples are to be taken from each sublot. See Figure 502-4. Ensure the bond coat has broken before paving starts. with the proposed access and/or road improvements are required in accordance with standards and practices accepted by MDOT SHA. Drum mixers come in many different types, such as parallel flow, counter flow, double barrel, drum-within-a-drum and drums with separate mixing chambers (Figure 501-4). Qualifications of material sampling technicians. 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. The temperature of the mix must be kept uniform so that the viscosity of the mix does not change and influence the balance of forces acting on the screed. 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. Figure 502-14 shows some typical surface patterns and the causes. As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. A bond coat is an application of an asphaltic emulsion to an existing surface as a bond or tack coat ensuring adhesion with the overlying surface and preventing displacement ahead of the roller. mdot hma selection guidelines - A process used in which HMA Production for specific HMA mixtures and HMA plants are limited to 400 to 1000 tonsrporation of FUSP 501BB, 501 FF, 501 GG, and 501 L. Changes made to Hot Mix Asphalt (HMA) Mixture Selection Guidelines in the Road Design Manual SP305A: HMA Base Crushing and Shaping: 3/27/2021: HMA . 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. xc```b``"9@Y8\u],#(f`2=d`f: f
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. Can speed be locked in on vibratory rollers? To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. 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. The Contractor will use several types of rollers and each type is used for different purposes. It is generally impossible to roll these marks out once the mat cools. This section provides the mix design guidelines for Marshall and Superpave HMA mixtures for use on MDOT projects. Federal-Aid Highways Environmental Efforts Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. Document when immediate possession of the extracted cores occurs (core ID, date, time, etc.). Obviously the higher the frequency, the faster the vibratory compactor may roll. 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. 109 0 obj
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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. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 Joints that are poorly sealed should have the old seal material removed and the joints cleaned. 30 to 70m 3 /h; EMA Compact plant, perfect for prefabricated. 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. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. Stopping the paver and allowing the screed to settle into the mat. It shall be capable of maintaining the asphalt emulsion at the specified temperature. Vegetation and debris should be removed from joints and cracks. Common Safety Countermeasures for Local Agencies for Peds and Bikes 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. Are circulating systems working properly? 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. The augers are used to distribute the mixture across the total width of the screed. A pre-production meeting should be held before work commences on a project. The elevation of a fresh mat in relation to the base. endstream
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Loads that have become contaminated because of spilled gasoline, kerosene, oil and the like, should not be used in the roadway. <>
There are, of course, limits to this. See Figure 502-12. For each roller employed on a project, the mat width should be divided by the width of the compaction roller to determine the number of passes needed to cover the entire width being paved. 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. NEPA Guidance The top course mixture can be used for wedging when the thickness is less than 2 inches. 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 the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. Item 340 is generally not recommended for projects with more than 5,000 tons of HMA. Open texture areas in the joint should be filled using the HMA mixture with the large stones removed. If temperatures warrant, the sides and bottom of the truck bed should be insulated. This page was last edited on 13 January 2022, at 11:41. Do pneumatic rollers have a min. The number of rollers needed and the number of passes each roller needs to make will be based upon the mixture temperature and the rate at which the mixture cools. Vibratory rollers do not have to roll rapidly to maintain production on the job. The aggregates are then proportioned by weight into the mixer, also called the pug mill. 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. If the wedging is greater than 3 inches, two courses of HMA mixture may be required. This material can be neat, unmodified or modified with polymers, rubber, latex, etc. An approved grade referencing attachment, not less than 30 feet in length, may be used. Rocking slabs must be stabilized. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. Sampling frequency required is based on the percentage/tonnage of RAP that will be utilized on the project. This skirt will help keep the tires hot by holding the heat from the mix under the roller. Keep the level of mix in the hopper above the flow gates. Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. Samples to be taken a minimum of every mile in each lane by milling or coring. The good looking surface texture can lull the operator into a false sense of security. This is a certified product and the suppliers must be on the Certified Products List. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. See Figure 502-6. Profiling is used to establish a new cross section in the existing pavement. Vibratory rollers come in a variety of configurations. The screed is attached to the tractor unit at only one point on each side of the paver. ?,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 rolling zone is the distance behind the paver where the breakdown roller operates. 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. Some pavers may be equipped with augers that extend automatically as the screed is extended. Ensure existing surface failures are repaired properly. 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. FY 2023 Project Planning Guide FY 2022 Project Planning Guide Requesting a ProjectWise Folder Federal Aid Buyout Program Urban Road Program Rural Road Program Bridge Program TAP If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. Our goal is to keep Michigan's motorists safe, informed, and mobile. Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. 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. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l This information must be detailed and complete. This equipment must be safe, environmentally acceptable and capable of producing a specification product. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. Three types of self-propelled rollers are currently being used: static steel wheel, pneumatic tire rollers and vibratory rollers. FY 2024 HSIP Streamlined Systemic Application The flow gates should be adjusted to provide a uniform head of material in front of the screed. At MDOT, safety is paramount. This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. The TSCs are designed to respond to the transportation needs of local communities for the highest level customer service. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received Mountain Standard Time is the second westernmost time zone in the United States and Canada. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
Refer to Figure 502-10. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. If the end of the lane is to be left open overnight, a ramp joint should be used. Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. 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. Pneumatic tire rollers are required for initial compaction on all base and some leveling courses to knead the material into all cracks and depressions for better density. The document has moved here. Compaction of the taper section will be required as near to final density as possible. If distortion of the base course occurs during the paving operation, the mixture placement should be stopped until the condition of the base course is corrected. 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. Sampling methods and frequencies should be discussed. The Bureau of Bridges and Structures is responsible for statewide policy, procedure development, and execution to ensure all bridges and structures are designed, constructed, maintained, and operated to ensure safety. The grade sensor usually rides directly on the beam at its midpoint. Refer to Section 403 of this manual for more information on adjusting drainage structure. 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 Careful when an asphalt surface is being placed on an aggregate base adjoining a or... Adjusting drainage structure 70m 3 /h ; EMA Compact plant, perfect for prefabricated this was! Satisfactory and uniform product to exceed this one impact or more per inch of travel may produce ripples... Rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan the... Respond to the tractor unit at only one point on each side of the truck should. 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