Pavement density control, roller patterns. 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 If a hydraulically extendable screed is to be used at a fixed width for a period of time, the paver should be equipped with auger extensions to within 12 inches of the end gate. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. This is helpful at lane tapers, crown corrections, or in areas of wedging. The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. The discussion should include the safety of those individuals working on the project, as well as the safety of the traveling public. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. Attach copies of the qualification documentation for the sampling technician to the preproduction meeting minutes for each HMA paving project where HMA sampling is required. The paint dot is to be visible on the core during handling and testing. The rollers must be clean and free to rotate to allow smooth forward travel of the paver. The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. Figure 502-16 shows an example of a coring documentation form. The aggregate used to make the mix can be a single aggregate, but it is generally different sizes blended together through the cold feed bins to produce proper gradation. When such changes do occur, it is important that they be communicated between the Contractor and MDOT and between MDOT and the Contractor. Paver speed is a large contributor to the smoothness of the ride on a finished pavement. 2024 HSIP Selection List Public Notice of Metro Region Bridge Council Meeting for September 28, 2022 Moved Permanently. Emptying the paver wings when the hopper is empty. If the automatic controls are being used, the screed operator should not try to change the screed manually by turning the thickness control crank. 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. Mixture types to be used and the sampling and testing procedures vary depending on the specifications used. Paver speed for various production and application rates can be calculated using the following equations or selected from Figure 502-5. Once the line is set at the proper elevation, it is imperative that the line remain untouched both before and after the paver sensor passes over. Roller Checklist - Manufacturer and Roller Number -______________________________________. stream Qualification of the material sampling technicians should be a pre-production meeting agenda item. Check the mixture thickness, or yield, within the first three truckloads. Pavement Type Selection Process; Ride Specification . ?,E_Bs>B~Ke?Ltqv`K?7GT=?e{T.gJu08!RmK?>\TG>X*zsK>C/>RXKG9>DOcpbcc?~JvGp_dfXq1]=K57:To dr>I7|IT3E?K8C.C i>Jspv0phJvpv@!C],U)BZ9**#"52pODGJ)E2A@oq )N-?Ihr>jcvM2}czL=NwX]QD;vu;djZkSLpX\w]>4t7~~}>kzr}^a{~cW/juWQ1fwH0?c:@ ^ ^ thI9#~wLH0]=.DEe4k;kR/_w\W]6xLK} 1Gp=azK%Ad/?t-[3)3x!Kyho6pkF1?Q!+]P#6Nt|ioF7K{O^j5[5U=uFh=tq-17|~%{knFic7'Fz]T^Ukkk}g[ L o.yhyKRr+a'oE. The office is responsible for media relations, social media, and website development. The Bureau of Transportation Planning develops and implements a comprehensive transportation planning process which results in investments that are consistent with the policies of the State Transportation Commission. b. This check is done by roughly measuring the area covered by one truckload; the tonnage placed is known from the load ticket. These trucks are loaded in the same manner directly from the silo at the plant. x DH,YZ`XUNC9*F !c+6N The elevation of a fresh mat in relation to the base. Hot Mix Asphalt Selection Guidelines Revised: 03/10/2020 FHWA Approved: 05/07/2020 The following guidelines have been developed at the request of Local Agency Engineers for use on Local Agency projects. 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. 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The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? The substitution of another HMA mixture type other than the recommended mixture is acceptable if it has demonstrated to perform under similar traffic conditions. 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. 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. Fuel oil is not to be used as a release agent. 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. When slope control is used, the thickness of the mat on the side of the paver that is controlled by the slope sensor could be variable, depending upon the condition of the existing surface. The tiers identified below apply to Superpave This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Did you know that millions of people visit the Great Lakes State every year? All roller marks should be removed by the finish roller. The breakdown roller should be as close to the paver as possible. Be in good condition with no holes or tears. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? Projects constructed under a warranty special provision still require inspection staffing and complete documentation prior to payment, including MDOT materials certifications, MDOT yield checks, MDOT quantity measurement, and MDOT Inspectors Daily Reports. The trucks should not be loaded by slowly driving forward while the mix is being delivered from the silo. Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. 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. Transportation Grant Programs, Letting Process, Local vs. MDOT for Enhancement Projects, Heidi Spangler, Safety Engineer, 517-230-4605, FY 2024 Local Safety Program Applications Received 309 0 obj <> endobj These tears are usually caused by improper paver condition, or operation, by cold mix, and by attempting to lay a mat too thin compared to aggregate size. Worauf Sie als Kunde bei der Auswahl der Nici qid achten sollten. See Figure 502-6. Each MDOT region has several Transportation Service Centers (TSCs) that are designed to respond to the transportation needs of local communities. 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. MDOT Standard Practice for Random Sampling of HMA Materials, Utilizing Reclaimed Asphalt Pavement (RAP) Millings from the Same Project When Using a Portable Hot Mix Asphalt (HMA) Plant, Division 5 - HMA Pavements and Surface Treatments, https://mdotwiki.state.mi.us/construction/index.php?title=501_-_Plant_Produced_Hot_Mix_Asphalt&oldid=6529, 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. Highway Safety Manual (HSM) Analysis Spreadsheet The TSCs are designed to respond to the transportation needs of local communities for the highest level customer service. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. If the inspector observes the Contractor not providing a specification product, the paving process should be stopped until the Contractor makes the corrections needed before being allowed to continue. The lane edge should not vary more than 1 inch in 3 feet from the established alignment. All things related to pavement engineering. <>/Metadata 445 0 R/ViewerPreferences 446 0 R>> 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). Bleeding (flushing) occurs when the asphalt cement comes to the surface under traffic. This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. The dump bed should not hit the paver when dumped. Select all. To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. Care should be exercised to keep dust to a minimum. A notch of up to 1 inch shall be placed at the top of the taper when placing HMA. 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. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. Finally, the difference in the alignment of the two screeds can cause a difference in the degree of compaction that is obtained from the screed. See Figure 502-3. The temperature should be checked immediately. Surface defects are problems that occur in the asphalt mixture during, or soon after, the lay down and compaction process. 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. At a minimum, all repairs shown on the plans shall be completed. The auger and the slat conveyor on the same side must be operated together. Bond coats may be considered cured when your shoes tend to stick without picking up material when walking over it. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. All nozzles on the distributor should be open and functioning. No raking of the joint is needed. While the paver is operating, laborers may work, or rework, a portion of the mix to fit the paving around objects and to fill in areas that the paver does not pave adequately, or cannot reach. Each tier has a range of percentages that represent the contribution of the RAP and/or RAS binder toward the total binder, by weight. A bond coat is an application of an asphaltic emulsion to an existing surface as a bond or tack coat ensuring adhesion with the overlying surface and preventing displacement ahead of the roller. FY 2022 Project Planning Guide Do extensions have proper vibratory action? FY 2024 Webinar Recording FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 ?.Y{F]S~oSu$m-uPt tQU[sn0o/w:&du7L+fM\8K'NYPALMUQkjJ\s.tWyfC D Does paver have properly working screed heaters? Each type of reference can be used on either side of the paver, or on both sides at the same time. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. endstream endobj %PDF-1.5 % Ensure the surface is cleaned of all dust, dirt and other debris. This 55 foot overall length assembly produces a mat with an exceptionally smooth riding surface. The paver consists of two primary parts, the tractor unit and the screed unit. FY 2013 Before and After Crash Study The department also produces numerous geographic information system maps to assist commuters, tourists, and businesses. Two factors within the screed itself can contribute to the degree of compaction. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. 80 to 150 m 3 /h Custom boutique photography for newborns, children, families, seniors, and weddings Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 Federal-Aid Highways Environmental Efforts The surface can have two types of waves: long waves and short waves. These adjustments may be allowed if there is reason for the request and as long as the resulting mixture meets the specifications for the project. Care should be taken to avoid overheating, which can cause permanent warping of the screed. FY 2023 Project Planning Guide This page was last edited on 19 January 2022, at 13:44. The mix may also foam so that it appears to have too much asphalt. USDOT Navigator Website. Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. ]Rt~cv!G(F5@QFJFIN$@>, ~zWRGO#wnpOs1`(yvM>.D>N^-E*na71K7L.E5! The good looking surface texture can lull the operator into a false sense of security. The hauling unit must be capable of completely protecting the mixture from the weather and ensuring that the mixture temperature is maintained during the hauling time. This is caused by an improperly adjusted screed angle of attack. This skirt will help keep the tires hot by holding the heat from the mix under the roller. At a minimum, the failed areas should be removed and replaced, the potholes properly patched, the cracks cleaned out and the ruts filled, or preferably removed by cold-milling. It is generally impossible to roll these marks out once the mat cools. Can VPM be locked in on vibratory rollers? Once the pavement has dried, multiple passes of a mechanical broom are needed to remove all the residual grit from the milled surface. An approved grade referencing attachment, not less than 30 feet in length, may be used. 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. Enough tie-down points to secure properly and prevent flapping. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. 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. This arrangement permits an average to be taken from the grade surface and another to be taken from the freshly laid mat. Every individual should know what is expected and know how to perform the assigned tasks. When specified, special additives may be required. If a good bond is not formed between the existing surface and the new overlay, a slippage, or sliding-type, failure can easily occur. As of January 1, 2022 the Personal Net Worth Cap applied to the Minority Business Enterprise (MBE) program will increase from to $1,788,677 to $1,847,024. 109 0 obj <> endobj Profiling is used to establish a new cross section in the existing pavement. The gates move vertically, either manually or mechanically. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. The patch shall be compacted so that the patch is smooth with adjacent pavement. Safety talks are a very good way to start each day for both the Contractor and MDOT personnel. 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. Rocking slabs must be stabilized. The grade sensor usually rides directly on the beam at its midpoint. I3 Q[LSP'@Df]]nt .Q1-^zAi"AN|.Tc The inspector should check the entire pavement surface to ensure that all corrections are made before resurfacing work begins. Loads that have become contaminated because of spilled gasoline, kerosene, oil and the like, should not be used in the roadway. This type of reference device is used only when the grade being sensed is relatively smooth. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. It is also possible to require the Contractor to remove a sublot of leveling course mixture that has already had the top course mixture placed upon it. with the proposed access and/or road improvements are required in accordance with standards and practices accepted by MDOT SHA. The slat conveyors in the bottom of the hopper should not be visible when the wings are emptied. Engineering Week videos and lesson plans are all-inclusive resources to show early elementary to high school students the career of civil engineering at MDOT. 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. In Michigan, there are three publicly-owned and operated bridges: Mackinac Bridge, Blue Water Bridge, and International Bridge. Irregularities in the lower courses can usually be corrected by removing or adding material. The desired degree of cross slope is dialed into the slope controller. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. 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 paver hopper is used to receive and temporarily hold the mixture from the trucks. endstream endobj endstream endobj If distortion of the base course occurs during the paving operation, the mixture placement should be stopped until the condition of the base course is corrected. The Office of Governmental Affairs represents MDOT's interests as new or amendatory legislation is developed or moving through the legislative process. Material from the existing surface is milled out to a depth as shown on the plans, or equal to the top course, across the entire width of the joint and to a length of 35 feet minimum. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. 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 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. Only enough bond coat should be applied that can be covered the same day. Refer to Figure 502-10. A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. Forms There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. Public Notice of North Region Bridge Council Meeting for September 22, 2022 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. Care should be taken to neatly construct the joint at a right angle to the centerline of the roadway. These guidelines will be incorporated into the next version of the HMA Production Manual. Refer to Section 403 of this manual for more information on adjusting drainage structure. Aggregate of different sizes should be stockpiled separate from one another. Keeping the hopper at least half full between truckloads of mix keeps the head of mix in front of the screed constant and this will reduce mat problems.

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