Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. Living Snow Fence, Fiscal Year Obligation Reports If the random core location falls over a tapered joint, it should be moved to the first point that the mat is full depth. If the wedging course is 3 inches or less, the inspector should string line the area to be wedged to determine the limits of wedging. Grey goos vodka - Der Gewinner . Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. 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. MDOT's A/E internal guidelines, and federal laws and regulations. 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. Final Report Part 3 Ensure the bond coat has broken before paving starts. 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. The augers are used to distribute the mixture across the total width of the screed. Rough, uneven surfaces should be leveled. 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. Test methods to be used should be reviewed to assure that individuals understand the purpose of each test, the location of the field lab and the personnel who are to conduct the tests, the time frame for the communication of the test results and the procedures to be used if failing test results are obtained. MDOT has seven region offices and several geographically located Transportation Service Centers (TSCs) in each region that handle transportation-related construction and maintenance programs. The subject of joints includes longitudinal joints and transverse joints, as well as the matched joint between an asphalt surface and a concrete pavement, or gutter pan. 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. Compaction of the taper section will be required as near to final density as possible. It is important for the screed extension to be attached securely to the main screed. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. This information helps the department identify congested areas, when congestion occurs and how often, cause of delay, and more. %PDF-1.7 % The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. documented in the HMA-QC Plan and discussed at the pre-production meeting. Profiling is used to establish a new cross section in the existing pavement. Samples to be taken a minimum of every mile in each lane by milling or coring. Document when immediate possession of the extracted cores occurs (core ID, date, time, etc.). 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. 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. This method uses paper, canvas or burlap as the separator, making it easier to remove the mix when the paving operation starts again. The results of all daily and periodic tests conducted at the asphalt plant must be recorded on the appropriate MDOT form. These trucks are loaded in the same manner directly from the silo at the plant. 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. 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. 81R ?+iKEsNAn#w Slick, highly polished surfaces, potholes, old patches, cracks and joints may require repairs. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. 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. Safety talks are a very good way to start each day for both the Contractor and MDOT personnel. Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. At relatively slow paving speeds, it might be possible to make the truck exchange while keeping the head of material constant. MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. 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. The field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). DZs}9{,dp ^E3 `E%)eNDL-F1>tcf^cs\3WCwn}YI.kaz1r LX[t6*4u*QEI^:RG3iiv=I ->6{mU=CKGuK'b If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. Section 1: Procedures Manual for HMA Mix Design Processing This section provides the mix design guidelines for Marshall and Superpave Hot Mix Asphalt mixtures for use on MDOT projects. 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream 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. Screed plates first wear out about four to six inches from the trailing edge. It is generally the responsibility of the Engineer to outline the scope of the project and to discuss the information provided in the contract documents. Vegetation and debris should be removed from joints and cracks. In addition, the spray bar should be set at the proper height above the pavement surface to provide for a double or triple lap of the liquid asphalt materials. The mat reference beam is spring supported on a series of wheels that roll on the mat. Improper adjustments of catch basins can create drainage problems, which will lead to early deterioration of the roadway. The Office of Communications works with the media to inform the public of MDOT's mission, policies and practices in a positive, consistent and credible manner. A result of specified mix contaminated with inferior performing, non-specification mix. It is generally impossible to roll these marks out once the mat cools. 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. Only enough bond coat should be applied that can be covered the same day. This is a certified product and the suppliers must be on the Certified Products List. The Office of Governmental Affairs represents MDOT's interests as new or amendatory legislation is developed or moving through the legislative process. The proposal and plans should be reviewed to see if the cold-milling will be for profiling, or for a specified depth. Regional Bridge Councils Contact Information The web Browser you are currently using is unsupported, and some features of this site may not work as intended. This arrangement can sense and correct any change in screed elevation. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. 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. 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. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. 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. 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. It covers all or parts of 13 states in the US and five provinces or territories in Canada. Public participation is integral to efficient, effective and responsive transportation decisions. Figure 502-14 shows some typical surface patterns and the causes. Although there are several ways to construct this joint, the most common is the ramp joint. Care should be taken to avoid overheating, which can cause permanent warping of the screed. Does the distributor have a capacity of at least 800gallons (3,000 liters)? The elevation of the string line must be set by a survey crew and the set line must be very taut. That is why MDOT offers many ways to help ease the stress of commuting by providing information that commuters want and need as they make daily travel decisions. 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. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. All nozzles on the distributor should be open and functioning. The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. Can VPM be locked in on vibratory rollers? FY 2025 Local Bridge Program Call For Applications - Due April 2022 In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. These asphalt cements may also contain anti-strip agents. The lane edge should not vary more than 1 inch in 3 feet from the established alignment. 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. 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 certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. 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. Additionally, a 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request. Placing the mat too thin based upon the aggregate size. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. xc```b``"9@Y8\u],#(f`2=d`f: f 109 0 obj <> endobj If the millings have aggregates larger than what is required for the mix design, it should be processed (crushed and/or screened) prior to stockpiling*. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. Do pneumatic rollers have a min. If the surface of the mat is cooling much faster than the mixture under it, the surface will check as the hot mix is compacted. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. The applied amplitude is determined by the location of the eccentric weights that are located on the shaft. The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. The paver hopper must be at least half full at the time the wings are dumped. This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. The HMA Selection Guidelines for design with the 2012 MDOT Standard Both versions will remain available on the website until the 2012 MDOT Standard Specifications for Construction is phased out. The aggregates are then proportioned by weight into the mixer, also called the pug mill. Item 340 is generally not recommended for projects with more than 5,000 tons of HMA. If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. 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. At the junction of the two augers in the center of the paver, adjacent to the auger gear box, there should be a reversed pitch auger, or paddle, to tuck the mixture under the gear box and assure that the mixture at this location is the same as that across the rest of the screed. 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. 4649 0 obj <]>>stream These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. If required, the truck bed should be insulated. Public Notice of North Region Bridge Council Meeting for September 22, 2022 . This type of reference device is used only when the grade being sensed is relatively smooth. 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. The next truck should then be backed toward the paver, stopping short of the paver. PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. 1918 provides The Office of Procurement and Contract Management (OPCM) Consultant Services Division (CSD) procures all Maryland Department of Transportation State Highway Administration (MDOT SHA) A/E contracts using Qualifications-Based Selection (QBS), as defined in Code of Maryland Regulations (COMAR) Title 21, Subtitle 12, "Procurement of Architectural Services and Engineering Services" and 23 CFR . 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. Welche Kriterien es vor dem Kaufen die Nici qid zu untersuchen gibt! Things that can cause a nonuniform application are, improper temperature, improper pump speed, sprayer bar height improperly set, spray nozzles clogged, or the nozzle overlap pattern is improperly adjusted. All nozzles should be turned at the same angle to the spray bar: approximately 30 degrees, depending upon the manufacturers recommendations. Joints that are poorly sealed should have the old seal material removed and the joints cleaned. If a good bond is not formed between the existing surface and the new overlay, a slippage, or sliding-type, failure can easily occur. A sublot is defined as 1 mile for this example of in-place 12 foot wide pavement. Some pavements may be disintegrated so badly that the fragments may have to be removed. Plants are certified in accordance with the HMA Production Manual. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. 311 0 obj <>stream Laying out core locations, discuss how it will be done. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. However, the amount of overlap between the first and second lanes is very important. This arrangement permits an average to be taken from the grade surface and another to be taken from the freshly laid mat. The discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. Communication cannot stop once the pre-production meeting is concluded. 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. 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. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. See Figure 502-7. The length of temporary taper shall be 5 feet for each inch of mat thickness. 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. Obviously the higher the frequency, the faster the vibratory compactor may roll. This floating screed principle is employed on all modern pavers in use today. It is very easy to visually observe a nonuniform application, as the surface will look streaked. The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). Does the paver have two operating warning lights? Sampling methods and frequencies should be discussed. The rolling zone should be kept as short as possible. Federal-Aid Highways Environmental Efforts 0PpdR7Lof 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). These tools include rakes, shovels, lutes, 10 foot straightedge, carpenters level and blocks and shims for supporting the screed of the paver when beginning operations at a butt joint. 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. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. Enough tie-down points to secure properly and prevent flapping. Another texture problem that may be observed is caused by material segregation. The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. R1-6 Gateway Treatment 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. After a short mixing process, the asphalt cement is added and the entire mixture is mixed for 30 to 45 seconds. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. b. This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. Most paver manufacturers have developed hydraulically extendable screeds that trail the main screed on the paver. This will allow for a better understanding later if deficiencies develop in the performance of the final product. Refer to Figure 502-10. Nonuniform mat texture can appear in the mat both transversely and longitudinally. 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. MaineDOT Best Management Practices for Erosion & Sedimentation Control ( 3/27/2008 update) MaineDOT Construction Manual MaineDOT Elation System Users Manual ( 1/1/2021 update) MaineDOT Maintenance Fast-dry Water-Based Traffic Paint ( 3/23/2016 update) Standard Details Book & Updates ( 7/8/2022 update) This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. Two factors within the screed itself can contribute to the degree of compaction. Before overlaying an old HMA pavement, it should be inspected. Material Quality - Resources; Material Quality Partnering Meetings. Our goal is to keep Michigan's motorists safe, informed, and mobile. 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. Does paver have properly working screed heaters? The MST time zone is the least populated time zone in the USA. The inspector should contact the Region HMA inspector for guidance. The finished mat should be smooth and free of blemishes. At a minimum, all repairs shown on the plans shall be completed. 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. All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. The name of the individual responsible for safety for the Contractor should be provided to MDOT so that rapid and clear communications can be accomplished if safety problems occur. 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