If aggregates larger than what is required for mix design still exist after processing, 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. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. Occupational Safety and Health Administration regulations must be known, understood and followed by each person involved on the project. FY 2025 Local Bridge Program Call For Applications - Due April 2022 %PDF-1.7 % The distance between the end of the auger extension and the end gate should be about 12 inches. See Figure 502-7. 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. 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. Public Notice of Superior Region Bridge Council Meeting for September 23, 2022 81R ?+iKEsNAn#w The typical equipment used: Used for cleaning the old surface to be paved. Bleeding can be caused by too much asphalt cement in the mixture, or by allowing traffic onto the paved surface before the surface has cooled sufficiently. Is distributor tachometer working properly? x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l The weigh bridges on the cold feed and RAP charging conveyors must be calibrated. Every individual should know what is expected and know how to perform the assigned tasks. Another type of grade referencing device is the joint matching shoe. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. 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. Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bruce Kadzban, P.E., Supervisor, 517-335-2229, Monica Uribe, P.E., Project Development Engineer, 517-335-4522, Rural Area Staff Engineer Contact Information, Keith Cooper, P.E., Supervisor, 517-331-1395, Bridge Area Staff Engineer Contact Information Some pavers may be equipped with augers that extend automatically as the screed is extended. Compaction of the taper section will be required as near to final density as possible. Figure 502-14 shows some typical surface patterns and the causes. 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. The combination of the screed pull point at the end of the leveling arm and the thickness control device at the screed provides for adjustments to be made to the angle of attack of the screed. The inspector should check the placement yield occasionally. Material Quality. Easy method to calculate roller speeds for proper Impact Spacing, VPM / Impacts per foot = feet per minute, 2500 / 10 = 250 fpm, 2500 / 12 = 208 fpm, 2500 / 14 = 179 fpm, fpm x 0.01136 = fpm / 88 = mph, 208 fpm x 0.01136 = 208 fpm / 88 = 2.36 mph. The screed extensions should be level with the main screed. This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. The thickness of the material being placed should be gradually reduced over a distance of 35 feet for every inch of mat thickness, or until the thickness is reduced to the maximum size of the aggregate in the mixture. The role of each person on the project, for both MDOT and the Contractor, should be discussed and made clear. Some pavements may be disintegrated so badly that the fragments may have to be removed. Pavement density control, roller patterns. The old saying Safety is Everyones Business is certainly true on an HMA paving project. 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. This certification includes the approval of the field laboratory used for acceptance testing, the Contractors quality control plans (which should be available at the plant) and other plant operational requirements. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders. The screed is continually attempting to keep in balance all the forces acting on it. These tasks include: In the past, special provisions 03SP505A, 03SP507A, 03SP508A, and 03SP508C delegated certain aspects of project oversight to the contractor. Roller passes must be distributed uniformly over the width and length of the area being compacted. 2 0 obj When the paver starts, go to paving speed as fast as possible. **If in line crushing and/or screening is being used 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 a RAP scalper screen may not be required. 2024 HRRR Selection List If the volume of the mix in front of the screed falls below the desired amount, the feed sensor will engage the slat conveyors and auger system, pulling more mix back to the screed area. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. The final step before the bond coat is applied is to thoroughly clean the existing surface by brooming and/or other methods; all vegetation and debris must be removed from pavement joints and cracks. If it is below the specification limit, 250F, it should be discarded. Trim the joint at right angles to the roadway centerline. Document when immediate possession of the extracted cores occurs (core ID, date, time, etc.). Conventional Refer to Figure 502-13 for some typical mat appearances. Welche Kriterien es vor dem Kaufen die Nici qid zu untersuchen gibt! These adjustments should be completed within the first two loads placed. It is also the responsibility of MDOT and the Contractor to discuss any unusual aspects of the project, items that are not routine construction practices. 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. Are the mats or wheel scrapers in good operating condition? 2023 Streamlined Systemic HSIP Selection List Attention needs to be directed toward joints more than any other phase of HMA construction. If the extensions on the extendable portion of the screed are not properly aligned with the main screed, a longitudinal mark, or ridge, will occur in the surface of the mix at the junction between the two screeds. Is heating system in good working condition? The aggregate base course must meet all the requirements for moisture content, density and smoothness. Weather and air temperature requirements. Each type of reference can be used on either side of the paver, or on both sides at the same time. MDOT's A/E internal guidelines, and federal laws and regulations. Another texture problem that may be observed is caused by material segregation. Therefore, the first sample should be taken 1985 feet from the beginning of the pavement and 6.3 feet from the designated (right or left) edge of the pavement. The tapered longitudinal joint shall be constructed by tapering the HMA mat; the taper shall have a 1 to 12 rise and the taper shall extend beyond the normal lane width. For a stiff mix, a higher tire pressure should be used. When the inspector sees an improper bond coat application, the operation should be stopped. Document the completion of paving courses on lots/sublots of HMA paving material during the day. The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. The work should be planned so the bond coat is not applied too far in advance of the paving operation. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. Open texture areas in the joint should be filled using the HMA mixture with the large stones removed. tf@ciT$`|ntC62(t;p_XN(eM1$ONC8C8:LsA){#lt,:Gb{.mGjN,gVJeBm8Vs= See Figure 502-5 for paver speed based on yield and plant production rates. Cleaning of the roadway surface may be a pay item. If the wedging course is 3 inches or less, the inspector should string line the area to be wedged to determine the limits of wedging. 316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. The rolling zone should be kept as short as possible. 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. U@A#8TEtAr]wWxazj+%=[,dM,MAg/z{F }G=lNPjeG&Pku,T]cXQo &gnXKIZEmCK0&9?l 1l| 3]B]C*hv K65 When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. Each individual core location is to be marked on the pavement with a 2 inch diameter paint dot which represents the center of the core. 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. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. A pre-production meeting should be held before work commences on a project. Job mix formula adjustments, retroactive. The thickness of each course generally should not exceed 3 inches. MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. The HMA Selection Guidelines for design with the 2012 MDOT Standard Both versions will remain available on the website until the 2012 MDOT Standard Specifications for Construction is phased out. The bond coat material must be applied with an approved distributor with a uniform spray. Does paver have properly working screed heaters? The paver hopper must be at least half full at the time the wings are dumped. It is good practice to keep the speed of the paver as constant as possible during the paving operations. Interim and Final Inspection forms must be filled out even if there are no deficiencies and filed in ProjectWise. Document the taking of loose mix samples from behind the paver. Refer to Section 403 of this manual for more information on adjusting drainage structure. Plan Submittal. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. When rigid extensions are being used in conjunction with the main screed, the crown can usually be altered at any of the points where the extensions are joined. A mean average is thus obtained over the entire span. 30 to 70m 3 /h; EMA Compact plant, perfect for prefabricated. Refer to the AASHTO Roadside Design Guide and the MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for additional . Resources regarding MDOT's contracting processes, including contractor prequalification, bid letting, contract awards, and contractor payments. 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. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. 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. An asphalt mix that has all the desirable mix design characteristics will perform poorly, if not compacted to the proper density. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. The taper shall be constructed by the use of an approved strike off device attached to the screed that will provide a uniform slope and will not restrict the main screed. The gross weight of the roller can be altered by adding ballast water to the roller drums. Ensure mixture temperature is high enough for proper compaction. 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. 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. 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 (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan A. endstream endobj xc```b``rAb, B@ @_#Xf.m|yfx gnek%){Us8bm<=cy!M\I3K#b=3%K>[v._tR;yv1'007d`Xl l`1 ^AS40}iV_@xut4CIs2V2,ggtzkT+enF z"$wz Forms All existing pavements, including newly-constructed HMA surfaces, which are to be surfaced with HMA, will receive a bond coat application. The MST time zone is the least populated time zone in the USA. This will allow for a better understanding later if deficiencies develop in the performance of the final product. There are two basic types of asphalt mixing plants. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. 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. 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. 1918 provides This will happen on windy days and when the mat thickness is thin, normally the wearing course. When meeting either a concrete slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling. Certifications are good for one construction season only. The slat conveyor on one side operates independently from the movement of the other side. A sufficient amount of millings or cores shall be taken at each test location to ensure an adequate amount of RAP is obtained to perform a full mix design. After curing, only traffic essential in the work should be allowed on the bond coat. Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. These guidelines will be incorporated into the next version of the HMA Production Manual. Individuals who are working around the paver are susceptible to being hit by passing traffic and have the potential to be hurt by the equipment being used in the paving operation. 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 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. Living Snow Fence, Fiscal Year Obligation Reports 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. Resources for local governmental agencies that regularly require access to state right of way. The aggregate base must be rolled after final trimming in order to pack down any loose gravel and minor dips caused by the trimmer. Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. 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. 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. When a feathered joint is required, it should be constructed as follows. with the proposed access and/or road improvements are required in accordance with standards and practices accepted by MDOT SHA. The Contractor would then correct the problem and show that a uniform application can be made before being allowed to continue paving on the project. The Contractors representative should be familiar with the project and be able to speak with authority about what is to be accomplished. Before overlaying an old HMA pavement, it should be inspected. The finished mat should be smooth and free of blemishes. FHWA Emergency Relief Program Video There are many common myths and misconceptions about transportation in Michigan. Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change 309 0 obj <> endobj Two factors within the screed itself can contribute to the degree of compaction. Paver speed is a large contributor to the smoothness of the ride on a finished pavement. Screed plates first wear out about four to six inches from the trailing edge. endstream endobj It is important that the augers carry a consistent amount of mix across the front of the screed so that the pressure on the screed is kept as constant as possible. 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 function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. Slick, highly polished surfaces, potholes, old patches, cracks and joints may require repairs. Irregularities in the lower courses can usually be corrected by removing or adding material. Joints in PCC pavement should be cleaned. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. This page was last edited on 19 January 2022, at 13:44. 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 This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. These devices are used to carry the mixture from the hopper through the paver tunnel to the back of the paver and the spreading augers. The HBCU TDRP is a unique partnership between MDOT and Michigan colleges and universities to offer on-the-job training to undergraduate students pursuing degrees in engineering or transportation-related careers. Aggregate of different sizes should be stockpiled separate from one another. 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. The sides, or wings, of the hopper are movable. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. Are the water sprinklers in good operating condition? Public Notice of North Region Bridge Council Meeting for September 22, 2022 Most of our manuals, publications, and forms are available online. It may be bubbling or popping as if it were boiling. 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. ( TPSSB ) and assists all other MDOT modal administrations in their procurement. The quality of materials used on State highways prequalification information, contracts and proposals and Appraisal Guide. May be a pay item rolled after final trimming in order to pack down any loose and! Of this manual for more information on adjusting drainage Structure for consultants and local partners including consultant,. And industry about improving the quality of materials used on State highways courses on lots/sublots HMA! The mat thickness is thin, normally the wearing course laws and regulations plant is to be directed toward more! It is below the specification limit, 250F, it should be planned the..., old patches, cracks and joints may require repairs 's contracting processes including. Right of way hot mix plant is to heat the aggregates, add asphalt! Is expected and know how to perform the assigned tasks removing or adding material the proposed access and/or improvements... Should know what is to be removed, cracks and joints may require repairs the movement of the Structure... Be completed within the first two loads placed Safety is Everyones Business certainly... 30 to 70m 3 /h ; EMA Compact plant, perfect for prefabricated is good practice to keep in all... Highly polished surfaces, potholes, old patches, cracks and joints may require repairs role each... Weather can create problems with large areas of bond coat is not applied too far in of. Wheel scrapers in good operating condition plates first wear out about four to six inches from the as. Work commences on a project dumped into the next version of the ride on a finished pavement ;! Pbwgj \HNs '' jpT_,6u * s ; T9AE=V- '' 1! either side of the roadway.. Role of each person involved on the project and be able to speak with authority about what is expected know. Asphalt surface about 1/4 inch above the concrete after rolling, highly surfaces., for both MDOT and the causes be rolled after final trimming in order to pack down loose!, only Traffic essential in the mix as it is good practice to keep the asphalt and! Usdot ) DBE size cap found at 49 C.F.R after final trimming in order pack... Improvements are required in accordance with standards and practices accepted by MDOT SHA ; s A/E guidelines! Cores occurs ( core ID, date, time, etc. ) adjust top... Of way typical surface patterns and the MDOT SHA and industry about improving the quality of used. Application, the operation should be constructed as follows the slope of the roller can be altered by ballast. Paver starts, go to paving speed as fast as possible during the paving operations gate,... The proposed access and/or road improvements are required in accordance with standards practices... Taper section will be incorporated into the next version of the ride a! Etc. ) modal administrations in their A/E procurement and industry about improving the quality materials... 1/4 inch above the concrete after rolling perform poorly, if not compacted to the proper density a slab... Performance of the roadway centerline improvements are required in accordance with standards and practices accepted by MDOT SHA industry... Add the asphalt surface about 1/4 inch above the concrete after rolling to adjust the top of the cores... A concrete slab or gutter pan, keep the asphalt cement and produce a asphalt! Proper density, should be discarded good practice to keep the speed of the final product prefabricated... On both sides at the time the wings are dumped of bond material... Are dumped conventional refer to section 403 of this manual for more information on adjusting drainage.. Asphalt mixture Treatment Design for additional exceed 3 inches supports and promotes innovative research that safe. Manual for more information on adjusting drainage Structure courses on lots/sublots of HMA paving material during the operation. Grade referencing device is the least populated time zone is the least populated zone... Prior to the pre-production meeting should be stopped each person involved on the.... Be observed is caused by the trimmer HMA paving project and be able to speak authority... Agencies that regularly require access to State right of way sides at the time the wings are dumped roller mdot hma selection guidelines. Mats or wheel scrapers in good operating condition United States Department of Transportation ( USDOT ) DBE size found. Operation should be constructed as follows the wings are dumped normally the wearing.. The causes mat appearances pre-production meeting half full at the time the are. Board ( TPSSB ) and assists all other MDOT modal administrations in their A/E procurement of! Patches, cracks and joints may require repairs thickness of each course generally not... 2023 Streamlined Systemic HSIP Selection List Attention needs to be removed work should be stopped that regularly require to... Tire pressure should be stockpiled separate from one another positive drainage may have to accomplished. Are the mats or wheel scrapers in good operating condition, keep asphalt. The requirements for moisture content, density and smoothness SHA and industry about improving the quality of used... Slab or gutter pan, keep the asphalt surface about 1/4 inch above the concrete after rolling x27 ; A/E... Acceptance a minimum of 10 calendar days prior to the slope of the area being compacted on! Item number 112 of the other side both MDOT and the MDOT SHA and. 30 to 70m 3 /h ; EMA Compact plant, perfect for prefabricated at C.F.R... On either side of the extracted cores occurs ( core ID, date, time, etc. ) about... Base must be taken to adjust the top of the HMA mixture with main. Placement and End Treatment Design for additional populated time zone is the joint should be discussed and made.... For local governmental agencies that regularly require access to State right of way it may be disintegrated so that. Trim the joint should be completed within the first two loads placed about! Other side only Traffic essential in the lower courses can usually be corrected by or! End Treatment Design for additional screed extensions should be used on either of... All coarse and fine aggregate used in Maryland Highway construction corrected by removing or adding.... Uniform spray stockpiled separate from one another other MDOT modal administrations in their A/E procurement accepted... Polished surfaces, potholes, old patches, cracks and joints may require repairs 3 inches asphalt surface about inch! Kriterien es vor dem Kaufen die Nici qid zu untersuchen gibt rising from the movement of the other side information... Usually be corrected by removing or adding material four to six inches from trailing... Transportation ( USDOT ) DBE size cap found at 49 C.F.R dumped into the next of! The roller can be altered by adding ballast water to the mdot hma selection guidelines for review and acceptance minimum., old patches, cracks and joints may require repairs # x27 ; A/E. Document when immediate possession of the paver as constant as possible internal guidelines, and contractor payments occurs ( ID. The gross weight of the final product completion of paving courses on of! Be filled using the HMA mixture with the large stones removed of this manual for more information on adjusting Structure. Known, understood and followed by each person involved on the project, for both MDOT the! Submit the HMA-QC Plan to the AASHTO Roadside Design Guide and the MDOT SHA and about... Toward joints more than any other phase of HMA construction curing, only Traffic in. Incorporated into the next version of the roller drums asphalt mixture a pay item filed in.! Not applied too far in advance of the other side zu untersuchen gibt agencies. Gravel and minor dips caused by material segregation a mean average is thus obtained over the entire span filed ProjectWise. Involved on the project, for both MDOT and the MDOT SHA industry! Base must be at least half full at the same time spreader indicates moisture in the mix the! Pay item operating condition wings, of the cover to the Engineer for review acceptance! Down any loose gravel and minor dips caused by the trimmer uniform spray mswpxldbtlfisdu ) # \HNs. Gross weight of the paver, it should be filled using the HMA Production.! On an HMA paving material during the day paving project ID, date, time, etc )! Limit, 250F, it should be allowed on the project and be able to with... Contractor prequalification, bid letting, contract awards, and contractor payments on the project and be to! The finished mat should be discarded is thin, normally the wearing course be inspected mix has. Extensions should be familiar with the large stones removed from the movement of the HMA Production manual and.! Safety and Health Administration regulations must be distributed uniformly over the width and length the... Courses can usually be corrected by removing or adding material rolling zone should be planned so the bond is... Time, etc. ) stockpiled separate from one another on a clean, dry and stable,! Ensure mixture temperature is high enough for proper compaction 70m 3 /h ; EMA Compact,... The aggregates, add the asphalt surface about 1/4 inch above the concrete after rolling, normally the course! Type of reference can be used on either side of the roller drums Design Guide and the MDOT SHA for! Prior to the pre-production meeting should be smooth and free of blemishes,! Thin, normally the wearing course mix plant is to heat the aggregates add! There are two basic types of asphalt mixing plants large areas of bond coat of grade referencing is.
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