The field application of the applied mix design is called the Job Mix Formula (JMF), (Figure 501-2). This minimum rate should also be used between courses as a tack coat. 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 Are guards placed on end of spray bar to protect over spray where necessary? It is important that the individuals in daily charge of the project for both MDOT and the Contractor meet periodically, both on a formal and informal basis, to discuss the progress and quality of the work done to date and the progress schedule for the future. The spray bar nozzles shall produce a uniform fan spray, and the shutoff shall be instantaneous, with no dripping. Rocking slabs must be stabilized. 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. See Figure 502-7. x\YoF~A4 M!"Gcy-3_}TA(z #*v}Ow>~_c~y}On}]mvy}Rc*UQ]n/?]v./8:~o?Q`Sv;WE]f_MAuOF}@,c?uQUYcmEEPuB',~WMQsE$XF-,V-g6mMa%[+ndv6>%T&G/fQx&[0{Rm z5WB3^sha!QBk`LB#D1V'iuZtDW}} . 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 502-2. Bond coat shall be applied to the taper before the adjacent lane is placed. x DH,YZ`XUNC9*F !c+6N FHWA Emergency Relief Flow Chart It responds to and averages changes in mat elevation in the same manner as the floating beam. Does the distributor have a capacity of at least 800gallons (3,000 liters)? When such changes do occur, it is important that they be communicated between the Contractor and MDOT and between MDOT and the Contractor. The top course mixture can be used for wedging when the thickness is less than 2 inches. 1TN7ln^cFgI,ubJZ&8,qz&Q. ?^7djE-/. 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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. Final Report Part 3 If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. 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. 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. Living Snow Fence, Fiscal Year Obligation Reports Unless otherwise noted, the patching and wedging work is done with the mixture that will be used for the leveling course. Forms Proper subsurface drainage should be installed as necessary. At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. Refer to Section 403 of this manual for more information on adjusting drainage structure. If automation is required, ensure its on and working. These tools include rakes, shovels, lutes, 10 foot straightedge, carpenters level and blocks and shims for supporting the screed of the paver when beginning operations at a butt joint. The temperature should be checked immediately. The surface can have two types of waves: long waves and short waves. 310 0 obj <> endobj 312 0 obj <>>>/Contents 313 0 R/StructParents 0/Tabs/S/CropBox[ 0 0 612 792]/Rotate 0>> endobj 313 0 obj <>stream 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. 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. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. Depending on the material and job conditions, this can be quite dramatic. For asphalt mixes, it can be expected that about 70 percent to 80 percent of the theoretical maximum density may be obtained as the mixture passes under the screed. Asphalt cement is the material that holds the aggregate together. RAP should be stockpiled* and tested according to existing requirements (one test per 1000 tons, minimum of three tests). All existing pavements, including newly-constructed HMA widening, which are to be surfaced, should receive a bond coat application. When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. % The good looking surface texture can lull the operator into a false sense of security. A superstructure that spans the screed and auger areas ties the two together and supports the grade sensor. The gates move vertically, either manually or mechanically. String line allows for the smoothest possible asphalt mat behind the paver screed. When a feathered joint is required, it should be constructed as follows. Shoulder samples shall be taken if RAP from shoulder is to be used. **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. A fast means of communication should be established between the plant and the paving crew so that any changes to the mixture can be promptly communicated. Things that can cause a nonuniform application are, improper temperature, improper pump speed, sprayer bar height improperly set, spray nozzles clogged, or the nozzle overlap pattern is improperly adjusted. Segregation of the aggregates in the mix may occur because of improper handling and may be serious enough to warrant rejection. A mean average is thus obtained over the entire span. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. This principle allows the paver screed to average out changes in grade that are experienced by the tractor wheelbase. wN: NDRC nt-+^`w0=}~uSn}~yr=tCe#uzZj7c@@ Document when immediate possession of the extracted cores occurs (core ID, date, time, etc.). MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. The department also produces numerous geographic information system maps to assist commuters, tourists, and businesses. Roller passes must be distributed uniformly over the width and length of the area being compacted. Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. Plan Submittal. Warranties are a tool to assure quality, but they are not a replacement for proper inspection, quantity measurement, proper payments, or proper contract administration. Fuel oil is not permitted for use on tapered joint rollers and mobile mat reference wheels. Laying out core locations, discuss how it will be done. Is heating system in good working condition? 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. [v2pBT9V9Y$Zq[Uh q91Ok6b dES 0k$#ti@o8pj#da*4mq9ZZz3WKI!VNTPkpcZ` Communication is one of the keys to a safe work environment. 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. 111 0 obj <>stream Once this has been done, complete the rolling of the joint. FHWA Emergency Relief Program Video This equipment must be safe, environmentally acceptable and capable of producing a specification product. The MST time zone is the least populated time zone in the USA. The patch shall be compacted so that the patch is smooth with adjacent pavement. If temperatures warrant, the sides and bottom of the truck bed should be insulated. Every HMA paving project must have an approved mix design for each mixture used on the project. <>/Metadata 445 0 R/ViewerPreferences 446 0 R>> 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 $1,847,024. Paver speed for various production and application rates can be calculated using the following equations or selected from Figure 502-5. Selection of appropriate pavement marking materials (paint, thermoplastic . Cutoff shoes can be used, if necessary, to reduce the width of mixture being placed to a width that is less than the basic main screed width. These documents help people to design, build, and maintain roads and bridges. Refer to Figure 502-10. The screed on the paver can be angled at its center to provide for positive or negative crown. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. To preheat the screed, the heaters are normally operated for a period of 10 minutes to 20 minutes before the commencement of the paving operation. Please contact your LAP staff engineer with any questions. <> Vibratory rollers come in a variety of configurations. tf@ciT$`|ntC62(t;p_XN(eM1$ONC8C8:LsA){#lt,:Gb{.mGjN,gVJeBm8Vs= Ensure the paver speed matches mixture delivery. TRAC engages high school and middle school students in solving real-world problems, such as designing bridges or analyzing the environmental effects of building a highway. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. 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). 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. FY 2024 Electronic Application Submittal Form 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 This article returns the responsibility for these tasks to MDOT for all HMA paving projects, including those that contain special provisions 03SP502D and/or 03SP502E. Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. Unsere Bestenliste Jan/2023 Ultimativer Produktratgeber Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen. This requires a HMA layer of varying thickness to be placed and is referred to as wedging. These adjustments should be completed within the first two loads placed. 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. x\Yo~'08>0@SClr~PdZ`ZOUuwu.w9b?Q=3:|w/>_owW>}WO.@EsG}9='__?SyDSm[k}>0 Since there are 5280 feet in the sublot, pick two numbers using the random number generating calculator, which are then multiplied by 5280. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. x[@P EsB$B%4!alkfYQNw9r%Oyzo&L1gk6l The flow gates should be adjusted to provide a uniform head of material in front of the screed. endstream endobj Some pavers may be equipped with augers that extend automatically as the screed is extended. . Does the Contractor have proper number of rollers? Select all. This arrangement can sense and correct any change in screed elevation. [ LlhwY6JgUMKu[N@Ws`#hm]4p{$dtm 32f.n4y9y{UU4oCnta'XfouA>8"DlygJu of seven wheels? For a stiff mix, a higher tire pressure should be used. 4 0 obj Phone: 443-572-5045 Fax: 410-787-0483 Email: TDavis5@mdot.maryland.gov Admixtures for Concrete Admixtures for Concrete Product Qualification Procedures (PDF, 200 KB) Qualified Products Air Entraining Agents (PDF, 200 KB) Drycast Admixtures (PDF, 200 KB) Precast Admixture (PDF, 200 KB) Type A - Water Reducing (PDF, 200 KB) A new folder, 107 Warranty Documentation, has been created in ProjectWise to house all documentation regarding each projects warranty. Copies of the letters sent should also be filed in the ProjectWise folder for future reference. 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. The paver screed is a leveling device attached to the tractor unit at only one point on each side of the paver; it is able to float on the asphalt mixture and to provide initial mat texture and compaction to the material as it passes over it. Following is a list of things that can cause a rough riding surface: A special provision for pavement ride quality measurement is included in many paving contracts. Pavement density control, roller patterns. 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. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. Everyone, regardless of title or job function, must be aware of the need for safe work practices. Distributor Checklist - Manufacturer and Distributor Number -______________________________. There are many common myths and misconceptions about transportation in Michigan. . 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 . Asphalt paving projects, like many construction projects, are not always built as originally scheduled. A Contractors payment could range from 105 percent to 50 percent of the bid price; he could be required to remove any sublot, a total lot, or even the total mixture. The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). Resources for local governments regarding grant & economic development opportunities, project coordination, and state and federal requirements. Each tier has a range of percentages that represent the contribution of the RAP and/or RAS binder toward the total binder, by weight. This report include report of all producer's topsoil material that meet the Section 920 Specification requirements as Landscaping material. Laying out core locations and traffic control for coring. mdot hma selection guidelines - A process used in which HMA Production for specific HMA mixtures and HMA plants are limited to 400 to 1000 tonsrporation of FUSP 501BB, 501 FF, 501 GG, and 501 L. Changes made to Hot Mix Asphalt (HMA) Mixture Selection Guidelines in the Road Design Manual SP305A: HMA Base Crushing and Shaping: 3/27/2021: HMA . Placing the mat too thin based upon the aggregate size. Care must be taken to adjust the top of the cover to the slope of the planned finished roadway. 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