mdot hma selection guidelines

If the push rollers are not cleaned periodically and do not rotate freely, the truck tires will slide on the rollers and increase the load on the paver. Typical Use: Item 340 is typically used for projects with small quantities of hot mix asphalt (HMA). The design may have been approved for another project; however, a JMF must be prepared for each mixture used on the project. Of sufficient weight and strength to resist tearing. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. 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. The screed is equipped with heaters, the purpose of which is to increase the temperature of the cold bottom screed plate to about 320F (160C). Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. 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. Does the Contractor have proper number of rollers? A list of equipment that will be used on the project should be supplied to MDOT. One procedure should constantly be followed: if in doubt about whether the information is important or beneficial, write it down. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. 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. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. Certifications are good for one construction season only. stream All traffic must be kept off of the bond coat until it is cured. Raveled, dried-out surfaces must be re-compacted and restored to the proper cross section. 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. Fuel oil is not permitted for use on tapered joint rollers and mobile mat reference wheels. If temperatures warrant, the sides and bottom of the truck bed should be insulated. Rocking slabs must be stabilized. It can be configured for automatic grade and slope, or dual grade control, as shown in Figure 502-8. 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. 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 Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. Bridge railings and piers, curb and gutter pans, and guardrails must be protected from the spray of bond coat by the use of shields. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Figure 502-14 shows some typical surface patterns and the causes. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). This is caused by an improperly adjusted screed angle of attack. Old patches that show signs of instability, areas with excess asphalt, or excess crack filler, and areas with loose material should be removed and repaired. Resources for local governments regarding grant & economic development opportunities, project coordination, and state and federal requirements. FY 2024 Electronic Application Submittal Form The inspector should contact the Region HMA inspector for guidance. 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. This allows the paver operator to feed more or less mixture to either side of the paver. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. Before the automatic screed controls are engaged, the screed must be nulled before paving starts and the proper angle of attack must be set. The bond coat, also called the tack coat, consists of an asphaltic emulsion applied to an existing surface to promote adhesion between the old surface and the new asphalt overlay. Conventional The speed of the paver should be adjusted to give a uniform texture and coordinate satisfactorily with the rate of delivery of the mixture to the paver to provide a uniform placement rate, without intermittent operation of the paver. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. 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. Any Judge violating such undertakings loses jurisdiction, resulting in his orders being VOID, and he himself commits a treasonable offense against the United States. The top course mixture can be used for wedging when the thickness is less than 2 inches. Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. ]Rt~cv!G(F5@QFJFIN$@>, Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. Custom boutique photography for newborns, children, families, seniors, and weddings Included are examples of calculations, documentation requirements, and . The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. See Figure 502-3. The asphalt cement in the storage tanks should be kept at a constant temperature, normally between 275F and 311F . Loads that have become contaminated because of spilled gasoline, kerosene, oil and the like, should not be used in the roadway. Roller passes must be distributed uniformly over the width and length of the area being compacted. endstream endobj If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. Incorporating Safety into Resurfacing and Restoration Projects Further, whenever rigid extensions are employed, the strike off, or pre-strike off, assembly must be added to the extension and set at the same location as the strike off on the main screed. When specified, special additives may be required. 2022 Selected Projects for FY 2025 Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. It covers all or parts of 13 states in the US and five provinces or territories in Canada. FY 2024 Webinar Recording There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. Are the water sprinklers in good operating condition? Care should be taken to avoid overheating, which can cause permanent warping of the screed. The top course will then be placed at a uniform rate. One of the greatest contributors to a poor ride on an urban project is the improper adjustment of manholes. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. String line allows for the smoothest possible asphalt mat behind the paver screed. 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. 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. When cold-milling by the ton is a pay item, a weigh person will be needed. The HMA mixture used for patching should be the top course mixture called for on the plans, or in the proposal. To reach the required density, the quickest initial compaction should occur directly behind the lay down machine. 1918 provides A superstructure that spans the screed and auger areas ties the two together and supports the grade sensor. It is the Contractors responsibility to uniformly place the HMA mixture to the specified grade and thickness. The primary compaction variables that can be controlled during the rolling process are: number of rollers, type of rollers, roller speed, number of roller passes and roller pattern. The front of the hopper must be constructed in a way to minimize the spillage of mix from the hopper. All mixtures specified for a project must have an approved mixture design before mix production can proceed. These guidelines have been reviewed and approved by the County Road Association of Michigan (CRA) Engineering Committee, and concurred with by Federal Highway Administration (FHWA) Michigan Section, and MDOT. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. 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. Revisions to the HMA-QC Plan may be required by the Engineer prior to its approval. Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. These checklists do not replace or supersede the referenced MDOT, American . The results of all daily and periodic tests conducted at the asphalt plant must be recorded on the appropriate MDOT form. A paving schedule for the project should be presented and discussed with MDOT. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer. Asphalt paving projects, like many construction projects, are not always built as originally scheduled. The OAG audit found the lack of documentation regarding the initial acceptance of the warrantied work, interim and final inspections, and notification to the contractor and Surety Company after the final inspection was completed. See Figure 502-6. 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. 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. 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