What number and type of rollers were used? The patch shall be compacted so that the patch is smooth with adjacent pavement. 81R ?+iKEsNAn#w 3 0 obj See Figure 502-6. The completed centerline joint should be uniform, closed and flush with adjacent lanes. Final Report Part 2 Refer to Figure 502-13 for some typical mat appearances. When a grade reference is used in conjunction with a slope control device, the grade reference sensor is typically positioned on the centerline side of the paver, with the slope controller determining the thickness of the mat on the outside edge of the pavement. 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. The work should be planned so the bond coat is not applied too far in advance of the paving operation. Custom boutique photography for newborns, children, families, seniors, and weddings 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. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. The top course will then be placed at a uniform rate. This mark can easily be eliminated by adjusting the elevation of the extendable screed in relation to the main screed. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. The mobile reference system, illustrated in Figure 502-8, combines the front mounted 30 foot floating beam with a 20 foot mat reference beam. There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. 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 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. Providing the highest quality integrated transportation services for economic benefit and improved quality of life. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. The old saying Safety is Everyones Business is certainly true on an HMA paving project. This page was last edited on 19 January 2022, at 13:44. It is important for the screed extension to be attached securely to the main screed. Aggregate is generally sized by means of a screen deck into two to four of these hot bins. 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. 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. It is very important to know what special provisions are contained in the proposal. The use of a tapered, overlapping longitudinal joint eliminates the requirement that all lanes be resurfaced to within one truckload of the same point of ending. Distributor Checklist - Manufacturer and Distributor Number -______________________________. Any severely distressed areas in the old rigid pavement surface should be cut out, removed and replaced using full depth repairs with PCC, or hot mix asphalt. This minimum rate should also be used between courses as a tack coat. The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. If the required smoothness is obtained in the first course, the subsequent courses can usually be placed uniformly by simply setting the paver for the thickness desired. This equipment must be capable of accurately removing the pavement surface, in one or more passes, to the required grade or cross section. Keep the level of mix in the hopper above the flow gates. When cold-milling by the ton is a pay item, a weigh person will be needed. One of the most important considerations in making a longitudinal joint is keeping the paver on a straight line of travel. This is caused by an improperly adjusted screed angle of attack. This allows the paver operator to feed more or less mixture to either side of the paver. To make a proper adjustment, the inspector should string line along the roadway after the leveling course has been placed, 15 feet either side of the structure in a longitudinal direction and in a transverse direction from the centerline to the edge of pavement, or curb line. Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. Occupational Safety and Health Administration regulations must be known, understood and followed by each person involved on the project. 0PpdR7Lof A properly heated screed, particularly at the start of the days paving operations, or after any extended shutdown of the paving process, provides a more uniform mat surface texture. Placing the mat too thin based upon the aggregate size. FHWA Emergency Relief Flow Chart Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. 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. 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. Profiling is used to establish a new cross section in the existing pavement. 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. Resources for specialized engineering and technical support for construction staff across Michigan. Mountain Standard Time is the second westernmost time zone in the United States and Canada. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. USDOT Navigator Website. FY 2023 Project Planning Guide These adjustments should be completed within the first two loads placed. Load ticket = 46.96 tons x 2000 pounds per ton= 93920 pounds, Area Covered: 421 feet x 12 feet wide/9 sft/syd = 561.33 square yards. 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. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. 4643 0 obj <>stream Vegetation and debris should be removed from joints and cracks. Any Judge violating such undertakings loses jurisdiction, resulting in his orders being VOID, and he himself commits a treasonable offense against the United States. Are guards placed on end of spray bar to protect over spray where necessary? Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 After curing, only traffic essential in the work should be allowed on the bond coat. Do extensions have approved method of heating? The temperature should be checked immediately. 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. During this meeting, the overall goals and expectations are set for the project. 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 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 top course mixture can be used for wedging when the thickness is less than 2 inches. Adjust catch basins after the leveling course has been placed. 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. The uniformity of the roller passes is just as important as the number of passes. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. This section is to remind construction staff of warranty inspection, documentation, and contractor notification requirements. Staff oversight should be at a level to assure compliance with contract specifications and to properly assure the quality of the constructed work. The density obtained by the paver screed is also a function of the speed of the paver. 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. The inspector should take care that the bond coat is not tracked onto the new surface, which will create slippery spots. Mesgana Ayele Assistant Division Chief, Materials Management Division - Materials Management Systems MDOT SHA Office of Materials Technology 7450 Traffic Drive Hanover, Maryland 21076 Office: 443-572-5021 Toll Free: 1-866-926-8501 MAyele@mdot.maryland.gov 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. 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. 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. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. 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