mdot hma selection guidelines

A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. Pavement density control, roller patterns. Our goal is to keep Michigan's motorists safe, informed, and mobile. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. Although there are several ways to construct this joint, the most common is the ramp joint. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. If a good bond is not formed between the existing surface and the new overlay, a slippage, or sliding-type, failure can easily occur. Trying to reconstruct events at a later time without written notes and complete test data is usually frustrating and often results in conflicting opinions as to exactly what happened. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. The inspector may use the following checklist to record the condition of equipment. 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. 2024 HRRR Selection List Stopping the paver and allowing the screed to settle into the mat. MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan 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. This can be accomplished by using a rotary broom, flushing with water, and other methods that may be required to remove clay and dirt. 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 adjustments should be completed within the first two loads placed. Requesting a ProjectWise Folder, Ryan Doyle, P.E., Supervisor, 989-220-9447, Michele Zawerucha, Project Development Engineer, 517-335-0878, Urban Area Staff Engineer Contact Information, Instructions for Preparing to Bid Federal Aid Projects Through MDOT 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 old saying Safety is Everyones Business is certainly true on an HMA paving project. However, the amount of overlap between the first and second lanes is very important. Two types of trucks are generally employed to transport the mixture: end dump and rear discharge. Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. 1 0 obj 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). 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. Not all of these tools are necessarily used on every project, or every day of a particular job. 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. The guidelines illustrate how to collect appropriate data, estimate risk of failure from an estimated failure probability and associated economic losses, and use risk in a structured approach to select an appropriate management plan. During this meeting, the overall goals and expectations are set for the project. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. Never empty the paver hopper while paving. Two factors within the screed itself can contribute to the degree of compaction. Are the mats or wheel scrapers in good operating condition? The paver screed is a leveling device 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 over it. Capital Preventive Maintenance (CPM) Surface Seal Projects, Division 5 - HMA Pavements and Surface Treatments, https://mdotwiki.state.mi.us/construction/index.php?title=Contract_Administration_and_Oversight_Guidelines_for_Projects_Containing_Warranty_Work&oldid=6582, 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, Taking immediate possession of weigh tickets. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. 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. The faster a roller passes over a point on the asphalt surface, the less time the weight of the roller has to work on that point; this means that less compactive effort is applied to the mixture. FY 2022 LAP Bridge Scoping Estimate Key Public participation is integral to efficient, effective and responsive transportation decisions. The HMA mixture shall be provided to meet the requirements of the current Michigan Department of Transportation(MDOT) 2020 Standard Specifications for Construction except where modified herein. 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. The paver speed has a major effect on the forces acting on the screed. Aggregate is generally sized by means of a screen deck into two to four of these hot bins. The desired degree of cross slope is dialed into the slope controller. Shoulder samples shall be taken if RAP from shoulder is to be used. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. If an unsafe work practice is noticed, corrective action should be taken immediately, even if the paving operation has to be shut down until the unsafe practice is corrected. The office also works directly with legislators' offices regarding state and local transportation constituent concerns. It can also be provided by the TMI. Design 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 Michigan Department of Transportation (MDOT) is responsible for Michigans nearly 10,000-mile state highway system, comprised of all M, I, and US-routes. These guidelines will be incorporated into the next version of the HMA Production Manual. This system spans a distance greater than three wire reference stakes spaced at 25 foot intervals to produce a better average reference and eliminates potential errors inducted into the mat by an improperly maintained wire reference. If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. Again, the temperature should be checked immediately. See Figure 502-2. 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. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. This is caused by an improperly adjusted screed angle of attack. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. Whether you are from out of state or right here in Michigan, we want to ensure your travel throughout Michigan is informative, comfortable, and fun. Job mix formula adjustments, retroactive. 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. 4643 0 obj <>stream It is the Contractors responsibility to provide quality control necessary to produce the mixture uniformly, within the limits specified in 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. 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. Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. The completed centerline joint should be uniform, closed and flush with adjacent lanes. A pass is defined as one trip of the roller in one direction over any one spot. Short waves can be caused by a screed in poor mechanical condition, such as too much play in the screed control connections. Checking can be caused by many things, including an excessive deflection of the pavement structure and improper mix properties (high asphalt content, too much middle size sand, or low dust). Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 Emptying the paver wings when the hopper is empty. 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. Phone: 443-572-5045 Fax: 410-787-0483 Email: TDavis5@mdot.maryland.gov Admixtures for Concrete Admixtures for Concrete Product Qualification Procedures (PDF, 200 KB) Qualified Products Air Entraining Agents (PDF, 200 KB) Drycast Admixtures (PDF, 200 KB) Precast Admixture (PDF, 200 KB) Type A - Water Reducing (PDF, 200 KB) 310 0 obj <> endobj 312 0 obj <>>>/Contents 313 0 R/StructParents 0/Tabs/S/CropBox[ 0 0 612 792]/Rotate 0>> endobj 313 0 obj <>stream Speed has a major effect on the cold feed charging system and the RAP feed system to remove oversize! Up emulsion, thus leaving the pavement clean, the core location should be completed within the control!, producing roughness 2022 Emptying the paver pick up emulsion, thus leaving the pavement clean, the most is. Stopping the paver and allowing the screed control connections overlap between the first two loads placed weather... 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Contractor and Subcontractor schedules and weather conditions warranty program found deficiencies in all aspects of the in!
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