wN: NDRC nt-+^`w0=}~uSn}~yr=tCe#uzZj7c@@ 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 of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. 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. 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. Contract Administration and Oversight Guidelines for Projects Containing Warranty Work Email this Page Contents 1 All Projects 2 Hot Mix Asphalt (HMA) Paving Projects 3 Concrete Paving Projects 4 Capital Preventive Maintenance (CPM) Surface Seal Projects 5 Documentation and Notifications All Projects FY 2024 Electronic Application Submittal Form Never empty the paver hopper while paving. 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. Resources for the development of quality transportation project documents and services. This will help ensure that sampling technicians for the project are formally qualified by the department. The dump bed should not hit the paver when dumped. A result of specified mix contaminated with inferior performing, non-specification mix. Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. The inspector will witness the Contractor taking the daily asphalt binder sample and submit to the Construction Field Services laboratory for binder certification verification testing. Included are examples of calculations, documentation requirements, and . Roller passes must be distributed uniformly over the width and length of the area being compacted. Typically, the string is supported on metal posts at 25 foot intervals. 4643 0 obj <>stream To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. 2023 HRRR Selection List, Highway Safety Manual (HSM) Process Resources for MDOT real estate standards, policies and procedures, and training. MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. 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. 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. Risk analysis is specifically used to select appropriate performance standards for various bridge . Adjust catch basins after the leveling course has been placed. The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. Incorporating Safety into Resurfacing and Restoration Projects 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. Once the pavement has dried, multiple passes of a mechanical broom are needed to remove all the residual grit from the milled surface. 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. In Michigan, there are three publicly-owned and operated bridges: Mackinac Bridge, Blue Water Bridge, and International Bridge. %PDF-1.5 % The method for determining the binder grade in HMA mixtures incorporating RAP and/or RAS is divided into three categories designated Tier 1, Tier 2 and Tier 3. These tasks include: In the past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight to the contractor. 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. Bond coat, also referred to as tack coat, is an asphalt emulsion. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. For this system, a feed control sensor is used to determine the amount of mix in the auger chamber. There should be enough trucks to provide a continuous flow of mix to the paver. This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. 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. Plan the width of application to ensure having bond coat under the matching longitudinal joint. This should be checked using a straightedge or string line. The stockpiles shall be large enough to supply a project continuously and consistently. The screed unit, which is towed by the tractor unit, establishes the thickness of the asphalt layer and provides the initial mat texture. Not all of these tools are necessarily used on every project, or every day of a particular job. FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 A listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. The mat reference beam is spring supported on a series of wheels that roll on the mat. Hand raking and shaping around the cover must be completed before the material cools. endobj Other surface blemishes are caused by the truck backing into the paver, the screed settling when the paver stops and when the paver operator empties the hopper wings into an empty hopper. The field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). 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). Each type of reference can be used on either side of the paver, or on both sides at the same time. MDOT provides technologies and partnerships in order to make the transportation system safer and less congested. This is helpful at lane tapers, crown corrections, or in areas of wedging. Laying out core locations and traffic control for coring. For asphalt mixes, it can be expected that about 70 percent to 80 percent of the theoretical maximum density may be obtained as the mixture passes under the screed. endobj Large enough to cover the top of the load and extend over sides and tailgate. At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. 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. The gates move vertically, either manually or mechanically. The majority of plants used are known as drum mix plants; the other, less frequently used type, is a batch plant. 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The elevation of the string line must be set by a survey crew and the set line must be very taut. The aggregates are then proportioned by weight into the mixer, also called the pug mill. The JMF is prepared and signed by the TMI. These averages are combined and measured at the grade sensor near the screed tow point. The operator should not make manual changes while automation is working. Two factors within the screed itself can contribute to the degree of compaction. Automatic screed controls are employed to keep the elevation of the pull points on the paver at a more constant elevation relative to the grade reference being used. See Figure 502-4. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. 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*. A fast means of communication should be established between the plant and the paving crew so that any changes to the mixture can be promptly communicated. Vegetation and debris should be removed from joints and cracks. Distributor Checklist - Manufacturer and Distributor Number -______________________________. 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. It is important for the screed extension to be attached securely to the main screed. The amount bid for HMA may be adjusted. This floating screed principle is employed on all modern pavers in use today. If a hydraulically extendable screed is being used with the paver, the crown can be introduced in the center of the main screed and also at the points between the main screed and the hydraulic extensions. FY 2022 LAP Bridge Scoping Estimate Key Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. The people most likely to be hurt on an asphalt paving project are those individuals who are new to this type of work. endstream endobj 2 0 obj 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. 2023 HSIP Selection List These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. For relatively thin layers of mix, generally less than 1-1/2 inch, the vibratory roller should typically be operated in the static mode. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. All mixtures specified for a project must have an approved mixture design before mix production can proceed. Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List Too Hot: Blue smoke rising from the mix usually indicates an overheated truckload. 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. The bond coat material must be applied with an approved distributor with a uniform spray. At the bottom of the paver hopper is a set of slat conveyors. 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. The haul trucks and all paving personnel must keep away from the line and not disturb it in any way. The rolling zone should be kept as short as possible. Material Quality. Fuel oil is not to be used as a release agent. Transverse joints not being properly constructed. Agreement is needed on the methods to be employed to complete the project on schedule, within specification and with minimum delays. It is very important that proper air pressure be maintained in all tires. A release agent may be applied to the surfaces of the truck or trailer bed. 311 0 obj <>stream However, if the project does not call for HMA mixtures, or the patching is in advance of the paving operation, any mixture readily available and approved by the Engineer can be used. Sampling methods and frequencies should be discussed. Materials A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. The finished mat should be smooth and free of blemishes. 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. When the paver stops, do it as fast as possible. The old saying Safety is Everyones Business is certainly true on an HMA paving project. The incline of a paving surface in the direction of travel, expressed by stating the rise or fall as a percentage of horizontal distance. The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? Final Report Part 2 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. 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. 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. The tractor unit receives the asphalt mixture from the haul trucks, carries that mixture back to the spreading augers, distributes the mixture across the width of the screed and pulls the screed over that mixture. Determine the length of one pavement representing a sublot of material, the width of the pavement and the number of samples, (n), needed for each sublot. A specified number of samples are to be taken from each sublot. Consultant Selection Weather and air temperature requirements. 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. These trucks are loaded in the same manner directly from the silo at the plant. 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. MDOT's A/E internal guidelines, and federal laws and regulations. In addition, the screed imparts a level of compaction with the vibratory action of the screed. Refer to Figure 502-9. *If approved by the engineer, in line crushing and/or screening will be allowed in lieu of processing RAP into a stockpile. The proposal and plans should be reviewed to see if the cold-milling will be for profiling, or for a specified depth. 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. x\YoF~A4 M!"Gcy-3_}TA(z #*v}Ow>~_c~y}On}]mvy}Rc*UQ]n/?]v./8:~o?Q`Sv;WE]f_MAuOF}@,c?uQUYcmEEPuB',~WMQsE$XF-,V-g6mMa%[+ndv6>%T&G/fQx&[0{Rm z5WB3^sha!QBk`LB#D1V'iuZtDW}} . If it exceeds optimum placement temperature, but does not exceed the specification limit, the truckload is usually not discarded, but immediate steps should be taken to correct the condition. The past, special provisions 03SP602A and 03SP602E delegated certain aspects of project oversight the... 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