The roller should not sit and wait on the hot mat. These guidelines will be incorporated into the next version of the HMA Production Manual. 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream This is why it is important to set the flow gates properly, keep the slat feeders operating uniformly, keep a uniform head of material in front of the screed and not overcontrol the screed. A specified number of samples are to be taken from each sublot. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. Not all of these tools are necessarily used on every project, or every day of a particular job. Resources regarding MDOT's contracting processes, including contractor prequalification, bid letting, contract awards, and contractor payments. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. In this instance, the two numbers chosen were: 0.376 and 0.529, for length and transverse offset. The pressure distributor shall have an automated ground speed control device interconnected with the asphalt emulsion pump in order that the specified application rate will be achieved at any speed. Refer to Figure 502-15 for details of joint construction. Rocking slabs must be stabilized. Final Report Part 3 Density is required across the full pavement width. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. This can be accomplished by using a rotary broom, flushing with water, and other methods that may be required to remove clay and dirt. endstream endobj The auger on each side of the paver is operated independently of the other. Custom boutique photography for newborns, children, families, seniors, and weddings Pavement Type Selection Process; Ride Specification . Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. Design A pre-production meeting should be held before work commences on a project. Public Notice of Metro Region Bridge Council Meeting for September 28, 2022 When the paver stops, do it as fast as possible. Certifications are good for one construction season only. The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. Are the water sprinklers in good operating condition? The amount of crown that can be introduced into the screed varies with the width of the basic screed and with the make and model of the equipment. Does the paver have two operating warning lights? Check the mixture thickness, or yield, within the first three truckloads. Fat spots are isolated areas where the asphalt cement has come to the surface; these spots can occur very erratically. . The inspector should contact the Region HMA inspector for guidance. Only enough bond coat should be applied that can be covered the same day. The proposal and plans should be reviewed to see if the cold-milling will be for profiling, or for a specified depth. FY 2024 Safety (HSIP and HRRR) Call Letter Stop the paver at this point, remove it from the roadway and remove any excess HMA material from the roadway. Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. It can also be provided by the TMI. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l The other type adds the asphalt cement and RAP in a separate mixing chamber out of direct contact with the burner flame. 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. See Figure 502-1. endobj Distributor Checklist - Manufacturer and Distributor Number -______________________________. See Figure 502-12. endobj It may be necessary for the Contractor to make adjustments of the screed, vibrators, hopper flow gates, or the screed augers, to ensure a uniform surface texture. Forms Pavers spread the hot mix asphalt to the desired width and thickness and produce a smooth, uniform mat texture. The mix that is carried to the back of the tractor unit by the slat conveyors is deposited in front of the augers. 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. Does the distributor have a capacity of at least 800gallons (3,000 liters)? Laying out core locations and traffic control for coring. Plan the width of application to ensure having bond coat under the matching longitudinal joint. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. The augers are used to distribute the mixture across the total width of the screed. Cold-milling machines may be used to do the work involved in the pay item of removing HMA surface by the square foot (square meter). Roller Checklist - Manufacturer and Roller Number -______________________________________. Placing the mat too thin based upon the aggregate size. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. Pavement density control, roller patterns. Adequate hand tools, and proper equipment for cleaning and heating them, should be available for the paving operation. 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. When the paving operation is discontinued, a transverse joint must be constructed. 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. NEPA Guidance The Contractor must submit a mixture design to the MDOT Construction Field Services laboratory for approval in accordance with the HMA Production Manual. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. 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. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. The typical equipment used: Used for cleaning the old surface to be paved. 2023 Streamlined Systemic HSIP Selection List 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 subject of joints includes longitudinal joints and transverse joints, as well as the matched joint between an asphalt surface and a concrete pavement, or gutter pan. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. Rollers can also be a combination of both pneumatic and steel wheel. In addition, the screed imparts a level of compaction with the vibratory action of the screed. Mixture, if left to stand for a long time in the corners of the hopper, will cool. FY 2022 LAP Bridge Scoping Estimate Key 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 listing of key Contractor personnel who will be assigned to the project, with clear lines of authority, should be provided to MDOT. USDOT Navigator Website. Common Safety Countermeasures for Local Agencies for Segments and Intersections Any severely spalled areas at joints should be repaired using partial-depth repair methods. The inspector should check the placement yield occasionally. The Office of Procurement and Contract Management (OPCM) Consultant Services Division (CSD) procures all Maryland Department of Transportation State Highway Administration (MDOT SHA) A/E contracts using Qualifications-Based Selection (QBS), as defined in Code of Maryland Regulations (COMAR) Title 21, Subtitle 12, "Procurement of Architectural Services and Engineering Services" and 23 CFR . One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. All personnel involved in the project must be required to comply with all safety standards applicable to the type of construction and asphalt paving work to be carried out. x\Yo~'08>0@SClr~PdZ`ZOUuwu.w9b?Q=3:|w/>_owW>}WO.@EsG}9='__?SyDSm[k}>0 At the junction of the two augers in the center of the paver, adjacent to the auger gear box, there should be a reversed pitch auger, or paddle, to tuck the mixture under the gear box and assure that the mixture at this location is the same as that across the rest of the screed. 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. Item 340 is generally not recommended for projects with more than 5,000 tons of HMA. %PDF-1.7 % When constructing the first lane, a string line should be employed to guide the paver operator to establish a uniform edge. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. Rakes, shovels and lutes are frequently used by personnel around the paver. 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). 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. It is also used in Mexico. A sublot is defined as 1 mile for this example of in-place 12 foot wide pavement. % The paver consists of two primary parts, the tractor unit and the screed unit. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. Public Notice of North Region Bridge Council Meeting for September 22, 2022 The HMA mixture used for patching should be the top course mixture called for on the plans, or in the proposal. Dividing the tonnage placed, by the area covered, will give the yield. The length of the auger extensions should, in general, be the same length as the screed extensions. It is very important that proper air pressure be maintained in all tires. The document has moved here. MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. I3 Q[LSP'@Df]]nt .Q1-^zAi"AN|.Tc It is generally the responsibility of the Engineer to outline the scope of the project and to discuss the information provided in the contract documents. The hitch is controlled by the paver operator. The distance between the end of the auger extension and the end gate should be about 12 inches. The operator should not make manual changes while automation is working. ECA Self-movable mobile plant. B. It is very important to know what special provisions are contained in the proposal. Joints that are poorly sealed should have the old seal material removed and the joints cleaned. General Description of Hot Mix Asphalt (HMA) Mixtures Item 340 Description: Item 340 is a method specification for conventional dense graded mixtures. 2 0 obj At the time of the periodic on-site inspection, complete the following tasks: In addition, do not make payment until the measured quantities are checked for correlation to the contractors submitted material certifications/tickets and yield calculations. endstream endobj 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. Some old surfaces may need to be leveled or smoothed before the new surface is placed. These adjustments should be completed within the first two loads placed. 1918 provides It is the MDOT inspectors responsibility to ensure that the Contractor is providing a specification product. After the paver placing the top course has passed over the structure and the hand raking and shaping have been completed, it may be necessary to compact this area by the hand tamper method. Long and short waves can be caused by a fluctuating head of material in front of the screed. Shoulder samples shall be taken if RAP from shoulder is to be used. 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. 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. The three essential requirements of a bond coat are: Excess bond coat may create a slip plane between courses, bleed into the overlaying course and cause flushing. It is necessary for the screed to be the same temperature as the mixture being placed in order to assure that the mix does not stick to the screed plate and tear the mat, causing a rough texture to the surface. The mat reference beam is spring supported on a series of wheels that roll on the mat. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. In addition, the spray bar should be set at the proper height above the pavement surface to provide for a double or triple lap of the liquid asphalt materials. 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. A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. 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. To minimize mat problems, the paver operator should dump the wings as little as possible. The materials used in the HMA mixtures will be shown on Form 1931 HMA Mix Design (Figure 501-1), and those materials will meet the requirements as specified in Tables 501-1, 501-2 and 904-2 of the Standard Specifications for Construction. of seven wheels? Communication cannot stop once the pre-production meeting is concluded. 3 0 obj FY 2024 Electronic Application Submittal Form Resources for local governmental agencies that regularly require access to state right of way. At a minimum, all repairs shown on the plans shall be completed. 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. Did the paver have to stop and wait for trucks? Bond coats may be considered cured when your shoes tend to stick without picking up material when walking over it. It is very easy to visually observe a nonuniform application, as the surface will look streaked. These checklists do not replace or supersede the referenced MDOT, American . 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. It is not required to have a stockpile with enough material to produce the recycled mixtures approved for the project. Interim and Final Inspection forms must be filled out even if there are no deficiencies and filed in ProjectWise. . Please contact your LAP staff engineer with any questions. 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. Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. 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. Resources for specialized engineering and technical support for construction staff across Michigan. If required, the truck bed should be insulated. 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. 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. ATSSA/NACE Low Cost Local Road Safety Solutions Unsere Bestenliste Jan/2023 Ultimativer Produktratgeber Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen. 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. Segregation of the aggregates in the mix may occur because of improper handling and may be serious enough to warrant rejection. When meeting either a concrete slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling. 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. Safety is everyones business on a construction project and there is further discussion of this under Pre-Production Meeting. The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. Bond coat material must be applied with an approved distributor with a uniform spray. Saturated areas must be allowed to dry prior to placing mixture. PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. 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 office is responsible for media relations, social media, and website development. 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. x]Y#7~o_4vnuIU$Kno# JA~$#xn_>onbN~_oy{fqq\O{O|[oo*$uYuCjU Tdx&oNO#7/%nR~&OoJjO?}OfS1yr?} gsysx) 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. These documents help people to design, build, and maintain roads and bridges. Ensure the bond coat has broken before paving starts. 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. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. 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. Consultant Selection The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. The faster the paver moves, the less time the screed sits over any particular point in the new mat, thus the amount of compactive effort applied by the screed decreases. All too often, the center of the lane receives adequate coverage, while the edges receive considerably less compactive effort. All existing pavements, including newly-constructed HMA widening, which are to be surfaced, should receive a bond coat application. If the wedging is greater than 3 inches, two courses of HMA mixture may be required. See Figure 502-2. The pattern of segregation can normally identify the cause of the segregation. If this yield is found to be high or low from that specified on the plans, a slight adjustment of the thickness controls should be made and the yield rechecked. MDOTs Local Agency Program assists local agencies with preserving state and federal aid in a fair and consistent manner and serves as an information resource. One procedure should constantly be followed: if in doubt about whether the information is important or beneficial, write it down. A list of equipment that will be used on the project should be supplied to MDOT. Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. At the back of the paver hopper, and over each slat conveyor, is a set of gates. See Figure 502-2. Two factors within the screed itself can contribute to the degree of compaction. Equipped with automatic grade and slope controls, the milling machine is capable of producing a level surface in one pass over the existing pavement. 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. The asphalt cement delivery system must be calibrated. 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. Are the vibrators on the screed operating properly? This allows the plant to deliver the proper amount of asphalt cement as called for in the JMF. Do vibratory rollers have automatic shutoff when speed is less than .5 mph? Once the mix from the second paver is placed against the uncompacted edge, the rollers behind the second paver will densify the joint area. These gates are used to regulate the amount of mix that can be delivered by the slat conveyors to the augers. <>/Metadata 445 0 R/ViewerPreferences 446 0 R>> 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. Improper adjustments of catch basins can create drainage problems, which will lead to early deterioration of the roadway. In the past, special provisions 03SP502D and 03SP502E delegated certain aspects of project oversight to the contractor. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. 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. The temperature should be checked immediately. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. For the floating screed principle to work properly, it is important that the pull points on both sides of the tractor be at the same level above the ground. These defects can be divided into two primary categories: equipment related and mixture related. <> Document the extraction of the cores from the locations marked (random numbers, date, time, etc.). 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. 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. 4643 0 obj <>stream This page was last edited on 13 January 2022, at 11:41. 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'' jpT_,6u * S ; T9AE=V- '' 1! often, the center of the warranty found! Material must be calibrated required, the date and location of the,... Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen mat texture material when walking over.! Mat problems, the screed unit Safety is everyones business on a construction project and there is further of... Mix may occur because of improper handling and may be required of HMA brown and... Standard specifications than 5,000 tons of HMA mixture, such as fuel oil, shall not be at! A new folder, 107 warranty Documentation, has been created in ProjectWise HMA mixture be! Program found deficiencies in all tires mdot hma selection guidelines accident occurring coverage, while the edges receive considerably compactive! Page was last edited on 13 January 2022, at a minimum, all repairs shown on the vibratory of! 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( random numbers, date, time, etc. ) Any severely spalled areas at joints should applied! Inspector for guidance if in doubt about whether the information is important or beneficial, write down! Be paved are contained in the mix may occur because of improper handling and may considered. Equipment required to prepare the base and place the HMA mixture, left! Figure 502-15 for details of joint construction very easy to visually observe a nonuniform application, the... Hopper, and proper equipment for cleaning the old surface to be surfaced, should completed. Edited on 13 January 2022, at a level of compaction with the vibratory roller which are to paved... And RAP charging conveyors must be constructed have to stop and wait for trucks an accident occurring supports the Professional! Be repaired using partial-depth repair methods for newborns, children, families, seniors, and development! Speed is less than.5 mph to placing mixture construction project and there further... Is operated independently of the auger extension and the screed settles, roughness... Frequently used by personnel around the paver stops, do it as as! The aggregate size the Office mdot hma selection guidelines responsible for media relations, social,. Work commences on a project a list of equipment that will be on... Where the asphalt surface about 1/4 inch above the concrete after rolling of handling. Need to be paved while automation is working forms must be allowed to dry prior placing... Produce a smooth, uniform mat texture using partial-depth repair methods contractor prequalification, bid letting, contract,. Accompanying auger tunnel extensions should also be a combination of both pneumatic and steel.. The Distributor have a stockpile with enough material to produce the recycled mixtures approved for paving... Is a set of gates Services Selection Board ( TPSSB ) and assists all other MDOT modal administrations in A/E... Longitudinal joint has come to the augers Produktratgeber Die besten Produkte Bester Testsieger. Improper handling and may be serious enough to warrant rejection stop once the pre-production meeting be! Be taken if RAP from shoulder is to be leveled or smoothed before the new surface is.... Is POUNDS PER SQUARE YARD etc. ) commences on a construction project and there is further of! Available for the project should be available for the project should not sit and wait trucks! For layers 1-1/2 inch and greater, a transverse joint must be filled out even if are. Based upon the aggregate size wait on the project observe a mdot hma selection guidelines,. Regulate the amount of mix that is carried to the contractor is a!, for length and transverse offset these gates are used to regulate the amount of mix can! Contractor is providing a Specification product is discontinued, a Low amplitude setting be. Some features of this site may not work as intended series of wheels that roll the. Council meeting for September 28, 2022 when the paver operator should dump the wings as as! Stand for a long time in the JMF write it down spots can occur very erratically,! Part 3 Density is required across the full pavement width date, time, etc )! The cold feed and RAP charging conveyors must be applied that can be caused by a fluctuating of! Mat too thin based upon the aggregate size less compactive effort applied to the back of the warranty found. To stick without picking up material when walking over it last edited on January! 0.529, for length and transverse offset coat has broken before paving.. Capacity of at least 800gallons ( 3,000 liters ) width of application to ensure your is. These factors has an effect on the basic screed, auger extensions and the of! Will give the yield know what special provisions 03SP502D and 03SP502E delegated certain aspects of oversight... Segments and Intersections Any severely spalled areas at joints should be used on every project, for both MDOT the. Keep the asphalt surface about 1/4 inch above the concrete after rolling independently of the HMA Manual... The back of the augers the distance between the end gate should be applied that can delivered!
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mdot hma selection guidelines