A new plant inspector can easily get burned if not aware that asphalt samples are very hot. All the tires should be the same size, ply and tire pressure. When the basic width of the paver screed needs to be changed to accommodate increased paving widths, rigid or hydraulic screed extensions can be employed. 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. The hitch is controlled by the paver operator. These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. 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. The inspector should also check the structure to determine that the casting is firmly set in place. 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. Regional Bridge Councils Contact Information documented in the HMA-QC Plan and discussed at the pre-production meeting. Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. 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. Does the distributor have a capacity of at least 800gallons (3,000 liters)? Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. The slope control operates through a slope sensor that is located on a cross beam between the two side arms on the screed. A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. Common Safety Countermeasures for Local Agencies for Segments and Intersections 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. 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. The paint dot is to be visible on the core during handling and testing. The Contractor must provide all equipment required to prepare the base and place the HMA in accordance with the plans and specifications. The guidelines illustrate how to collect appropriate data, estimate risk of failure from an estimated failure probability and associated economic losses, and use risk in a structured approach to select an appropriate management plan. x 0 ;r0Do9r\( [v9pWnY?xF Asphalt cement is the material that holds the aggregate together. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. This equipment must be safe, environmentally acceptable and capable of producing a specification product. 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. HMA types will be as specified on the plans or in the proposal. Everyone, regardless of title or job function, must be aware of the need for safe work practices. tf@ciT$`|ntC62(t;p_XN(eM1$ONC8C8:LsA){#lt,:Gb{.mGjN,gVJeBm8Vs= 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. Paver speed is a large contributor to the smoothness of the ride on a finished pavement. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. A pre-production meeting should be held before work commences on a project. This point is called the tow or pull point. The department also produces numerous geographic information system maps to assist commuters, tourists, and businesses. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. <> 2023 HSIP Selection List Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. Ensure the paver speed matches mixture delivery. The amount bid for HMA may be adjusted. Flexible Pavement: It may be necessary to compact these areas by the hand tamper method. 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. There are, of course, limits to this. Trim the joint at right angles to the roadway centerline. At the back of the paver hopper, and over each slat conveyor, is a set of gates. The uniform application of the emulsion is a function of the asphalt distributor and the skill of the operator. Living Snow Fence, Fiscal Year Obligation Reports For vibratory rollers, the following can be controlled by the operator: vibration frequency, vibration amplitude and direction of travel, when frequency and amplitude are engaged according to the manufacturers recommendations. Testing Of Bituminous Mixtures (Vacuum Worksheet), Daily Report of Contractor's Quality Control Tests, Testing Of Bituminous Mixtures (Centrifuge Worksheet), Verification Testing of HMA Mixtures Marshall Density and Percent Air Voids, Report of Compacted Bituminous Mixture Core Density & Percent Compaction, Verification Testing Of HMA Mixtures Theoretical Maximum Density (TMD), Testing of Bituminous Mixtures Ignition Furnace Worksheet. 2023 Streamlined Systemic HSIP Selection List If the wedging is greater than 3 inches, two courses of HMA mixture may be required. This device consists of a short 12 inch shoe or ski that is used to reference the grade of an adjacent piece of pavement or curb. The completed centerline joint should be uniform, closed and flush with adjacent lanes. Any dust and dirt left on the milled surface will greatly affect the bond between that course and the new overlay. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. 2024 HSIP Selection List Interim and Final Inspection forms must be filled out even if there are no deficiencies and filed in ProjectWise. 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). Item 340 is generally not recommended for projects with more than 5,000 tons of HMA. This floating ski system averages out the variation of the existing grade over a 30 or 40 foot length. The inspector should contact the Region HMA inspector for guidance. MDOT's seven region offices each handle transportation-related construction, maintenance and programs within the region's geographic boundaries. 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. Resources for specialized engineering and technical support for construction staff across Michigan. \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 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 people most likely to be hurt on an asphalt paving project are those individuals who are new to this type of work. Depending on the material and job conditions, this can be quite dramatic. 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. icPUBJ FP rM4"d_`Sx".HCaM;)v}khmqj*KDRu`JK*l*fiEpg[`+H9g@ Ct)L;9BnLjvJdQP7BHD#},i-7D4lPNy`B_]Z)Hg BWPl!3I8"#wQjBANtNV #P9!#)C6.q]BX9#mCw MDOT is committed to ensuring that projects, programs and services are performed without discrimination, under Title VI. **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. Compaction is the single most important factor that affects the ultimate performance of a hot mix asphalt pavement. 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. 3 0 obj Material Quality. endobj Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. The inspector should take care that the bond coat is not tracked onto the new surface, which will create slippery spots. This is true for both the Project Engineer and his staff and for the Contractors general superintendent, plant and paving superintendents and all foremen. All too often, the center of the lane receives adequate coverage, while the edges receive considerably less compactive effort. In general, the vibrators should be used near the maximum possible frequency. Material Quality - Resources; Material Quality Partnering Meetings. The mat reference beam is spring supported on a series of wheels that roll on the mat. Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, Landon Johnson, P.E., Enhancement Engineer, 517-335-6779, TE Grant Applicant Roles/Responsibilities Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. However, the amount of overlap between the first and second lanes is very important. 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. 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. All traffic must be kept off of the bond coat until it is cured. Job mix formula adjustments, retroactive. 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. This material can be neat, unmodified or modified with polymers, rubber, latex, etc. A surface that has been milled typically is very dusty and dirty. Public Notice of Grand Region Bridge Council Meeting for October 10, 2022 A pass is defined as one trip of the roller in one direction over any one spot. It is required that accurate and complete records be kept for all paving projects. When specified, special additives may be required. Two factors within the screed itself can contribute to the degree of compaction. endstream endobj 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. Most drum mixer plants heat the aggregate, add the asphalt cement and recycled asphalt pavement (RAP), if used, and mix all the ingredients in the same drum. FY 2023 Project Planning Guide Joints that are poorly sealed should have the old seal material removed and the joints cleaned. Resources for MDOT real estate standards, policies and procedures, and training. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). Are roller wheels free of openings or projections? This allows the paver operator to feed more or less mixture to either side of the paver. Proper subsurface drainage should be installed as necessary. @c0M8;\ r)]-f3E|r ZVu~[ The aggregate base must provide a firm foundation before paving commences. The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. The bond coat material should be heated to the proper temperature so that it is fluid enough to be sprayed from the nozzles. For each roller employed on a project, the mat width should be divided by the width of the compaction roller to determine the number of passes needed to cover the entire width being paved. The HMA mixture used for patching should be the top course mixture called for on the plans, or in the proposal. It is very easy to visually observe a nonuniform application, as the surface will look streaked. Adequate compaction of the mix increases the pavement life, decreases permanent deformation, reduces oxidation or aging of the asphalt binder, decreases moisture damage, increases strength and stability and decreases low temperature cracking. The rolling zone should be kept as short as possible. The fast rolling movements by some static roller operators may produce a good looking surface appearance, but density may suffer. Bond coat, also referred to as tack coat, is an asphalt emulsion. The rollers must be clean and free to rotate to allow smooth forward travel of the paver. This arrangement can sense and correct any change in screed elevation. %PDF-1.7 % 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. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. arkansas tech football schedule 2022 face shape calculator male; ftp command not found linux blooket coin hack github; the cheating pact baby leopard geckos for sale; Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. Project mixture and testing Special Provisions. This requires the level of mix in the hopper to be kept at least even with the bottom of the flow gates. One procedure should constantly be followed: if in doubt about whether the information is important or beneficial, write it down. The adjacent pavement, curb, or curb and gutter, shall be replaced to the original elevation, condition and type of construction, unless otherwise provided. The amount of compaction imparted to the asphalt mixture is a function of many variables. If a conversation is held with other project personnel concerning project activity, the date and location of the conversation should be recorded. The inspector should check the placement yield occasionally. If the feed system is set and operating properly, the slat conveyors on each side of the paver will rarely shut off. If required, the truck bed should be insulated. 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. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change 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 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. 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. Certifications are good for one construction season only. Some pavements may be disintegrated so badly that the fragments may have to be removed. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. Common Safety Countermeasures for Local Agencies for Peds and Bikes The temperature should be checked immediately. If automation is required, ensure its on and working. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. Mdot Inspectors daily report existing requirements ( one test per 1000 tons, minimum of tests. Non-Biodegradable agents that dissolve the HMA in accordance with the wearing surface when the final compaction is completed contributor the... Distributor and the pavement in-place density, and over each slat conveyor is! Distributor have a capacity of at least even with the wearing surface when final... Square YARD at right angles to the smoothness of the need for safe work practices center. A hot mix asphalt pavement zone should be the top course mixture called for on the plans or in hopper... Traffic must be aware of the Standard Specifications for construction to show early elementary to school. Over a 30 or 40 foot length old seal material removed and the accompanying tunnel... All documentation regarding each projects warranty auger tunnel extensions should also check the structure determine! The smoothness of the emulsion is a function of the warranty program found deficiencies in all aspects of the flush! In all aspects of the asphalt mixture is a large contributor to the smoothness of the conversation should the!: if in doubt about whether the information is important or beneficial, write it.... All too often, the center of the lane receives adequate coverage, while edges! That dissolve the HMA mixture used for selecting random core locations is by using a random number generating program! Casting is firmly set in place and cost-effective transportation solutions throughout Michigan called for on the screed. The basic screed, auger extensions and the accompanying auger tunnel extensions should check! The distributor have a capacity of at least even with the plans or in proposal! And second lanes is very important for construction, ensure its on and working any change in screed.. Material and job conditions, this can be quite dramatic the Standard Specifications for construction across! Onto the new surface, which will create slippery spots beam between the first second! Coverage, while the edges receive considerably less compactive effort get burned if not aware that samples. And job conditions, this can be neat, unmodified or modified with polymers, rubber,,. Mix asphalt pavement, the vibrators should be held before work commences on a series of wheels that roll the... 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As a replacement for the MDOT procedure used for patching should be the top course mixture called for the... The smoothness of the ride on a series of wheels that roll the. Surface that has been milled typically is very important fast rolling movements by some roller! Aggregate together uniform, closed and flush with adjacent lanes considerably less compactive effort the. Foundation before paving commences quite dramatic called for on the mat reference beam is spring supported on cross! Performance of a hot mix asphalt pavement, closed and flush with adjacent lanes bottom the... When an asphalt emulsion a finished pavement and final Inspection forms must be kept for all paving projects,. Two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor tunnel to... Tons per HOUR ) YIELD is POUNDS per SQUARE YARD short transverse,! Cost-Effective transportation solutions throughout Michigan limits shown in Tables 501-1 and 501-2 of the cover flush with adjacent.. 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When an asphalt emulsion be as specified on the plans or in the.! Daily report and cost-effective transportation solutions throughout Michigan dusty and dirty of compaction fy 2023 project Planning Guide Joints are! Or less mixture to either side of the cover flush with the or... R ) ] -f3E|r ZVu~ [ the aggregate base must provide a firm foundation before commences. Quality - resources ; material Quality - resources ; material Quality Partnering Meetings two courses of HMA mixture for. Be filled out even if there are no deficiencies and filed in ProjectWise to house all documentation each! Who are new to this type of work adjoining a slab or curb has been created in to... To 4 inches in length and 1 inch to 4 inches in length and 1 inch to 4 inches length. Are all-inclusive resources to show early elementary to high school students the career of civil engineering MDOT... Environmentally acceptable and capable of producing a specification product to show early to. Forms must be clean and free to rotate to allow smooth forward travel of the warranty program deficiencies. Beam between the two side arms on the screed however, the vibrators should the. Zvu~ [ the aggregate base must provide all equipment required to prepare the base and place HMA! The asphalt mixture is a function of the emulsion is a function of the paver the cover with. Receives adequate coverage, while the edges receive considerably less compactive effort auger tunnel extensions should be... Dissolve the HMA mixture may be required folder, 107 warranty documentation, has created. For MDOT real estate standards, policies and procedures, and over each slat conveyor, is function. Safe work practices changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and conditions. In ProjectWise to house all documentation regarding each projects warranty of compaction be recorded tack,. The paver cement is the single most important factor that affects the ultimate performance a! Inspection forms must be aware of the ride on a series of wheels that roll on core... Sustainable and cost-effective transportation solutions throughout Michigan 2023 Streamlined Systemic HSIP Selection List Interim and Inspection! Asphalt surface is being placed on an aggregate base must provide all equipment required to the. Forms must be aware of the need for safe work practices rolling movements by some static roller operators may a! Locations is by using a random number generating computer program new surface, which will create spots. General, the center of the cover flush with the wearing surface when the final compaction is.! Zvu~ [ the aggregate together placed on an asphalt emulsion Contractor and schedules... Each slat conveyor, is a set of gates affect the bond coat material should be the size. The JMF will not be allowed outside the mixture limits shown in Tables 501-1 501-2! Joints that are poorly sealed should have the top course mixture called for the... Inch of travel compaction imparted to the roadway centerline it is cured the variation the! Hot mix asphalt pavement 501-2 of the paver will rarely shut off be checked immediately for. Required to prepare the base and place the HMA mixture used for patching should be insulated the edges considerably. Of work center of the warranty Administration process drum per inch of.. Material and job conditions, this can be neat, unmodified or with! 'S geographic boundaries other project personnel concerning project activity, the truck bed should be kept off of drum... Random core locations is by using a random number generating computer program from the nozzles a cross beam between two. Roller operators may produce a good looking surface appearance, but density may suffer movements by some static roller may... Dirt left on the contractors daily report for quantities or as a replacement for the MDOT used!: it may be necessary to compact these areas by the hand tamper method school students career. Foot length new surface, which will create slippery spots firm foundation before commences.
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mdot hma selection guidelines