316 0 obj <<1cc850f8a7a5b5157c73556bf669a59d>]>>stream In addition, the screed imparts a level of compaction with the vibratory action of the screed. If trucks backing into the paver pick up emulsion, thus leaving the pavement clean, the bond coat is not cured. 115 0 obj <<4c7790beb010dcdd18f2ce7848bb2f38>]>>stream 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. When the paving operation is discontinued, a transverse joint must be constructed. The inspector should check the entire pavement surface to ensure that all corrections are made before resurfacing work begins. YDMP provides participants with opportunities to pursue higher education, personal growth, and exposure to transportation careers. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. 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. Because of its short length, the joint matching shoe will not remove any major variations that occur in the existing surface, or adjacent paved lane. Each MDOT region has several Transportation Service Centers (TSCs) that are designed to respond to the transportation needs of local communities. Maintain and document these certifications in the project files. These guidelines will be incorporated into the next version of the HMA Production Manual. Road Safety Audit Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. The Contractor will use several types of rollers and each type is used for different purposes. After coring is completed, the inspector should check the layer thickness for conformance to the standard specifications. 111 0 obj <>stream The finished mat should be smooth and free of blemishes. 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. 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. U@A#8TEtAr]wWxazj+%=[,dM,MAg/z{F }G=lNPjeG&Pku,T]cXQo &gnXKIZEmCK0&9?l 1l| 3]B]C*hv K65 Do all trucks have working backup warning systems? Although there are several ways to construct this joint, the most common is the ramp joint. A bond coat is an application of an asphaltic emulsion to an existing surface as a bond or tack coat ensuring adhesion with the overlying surface and preventing displacement ahead of the roller. Long waves may correspond to the distance between truckloads and may be associated with the reversal points of the rollers. Submit the HMA-QC Plan to the Engineer for review and acceptance a minimum of 10 calendar days prior to the pre-production meeting. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. No matter what type of plant is being used, several key items should be monitored. Screed plates first wear out about four to six inches from the trailing edge. The asphalt cement in the storage tanks should be kept at a constant temperature, normally between 275F and 311F . Are the water sprinklers in good operating condition? Can VPM be locked in on vibratory rollers? 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Our goal is to keep Michigan's motorists safe, informed, and mobile. 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. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. The roller should not sit and wait on the hot mat. Any questions about the information in the contract documents should be raised and clarification requested, if necessary. At a minimum, all repairs shown on the plans shall be completed. 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. Selection. Figure 502-16 shows an example of a coring documentation form. 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. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. 1918 provides The old saying Safety is Everyones Business is certainly true on an HMA paving project. A. The inspector should take care that the bond coat is not tracked onto the new surface, which will create slippery spots. When a grade reference is used in conjunction with a slope control device, the grade reference sensor is typically positioned on the centerline side of the paver, with the slope controller determining the thickness of the mat on the outside edge of the pavement. Experience has shown that these sections generally settle after a short period of time. MDOT's commissions, councils, task forces, and partnerships are responsible for establishing policies, supervising programs, overseeing state and federal funds, providing recommendations and advisement, and acting as a resource. Resources for the development of quality transportation project documents and services. Roller passes must be distributed uniformly over the width and length of the area being compacted. This type rollers compactive effort is a function of the wheel load, the tire pressure, the tire design and the depth of penetration of the tires into the mix. Plan the width of application to ensure having bond coat under the matching longitudinal joint. Document the taking of loose mix samples from behind the paver. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. In addition, a RAP scalper screen is required**. 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 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. Does the Contractor have proper number of rollers? 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. 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. 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. Sampling methods and frequencies should be discussed. Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. Real Estate Guidance For a stiff mix, a higher tire pressure should be used. Everyone, regardless of title or job function, must be aware of the need for safe work practices. The tiers identified below apply to Superpave Transverse screed marks are transverse indentations in the mat, which may occur when the paver stops between truckloads. The augers must be extended if the screed is extended. Too Cold: A generally stiff appearance, or improper coating of the larger aggregate particles, indicates a cold mixture. During this meeting, the overall goals and expectations are set for the project. Are the vibrators on the screed operating properly? Bond coat material must be applied with an approved distributor with a uniform spray. In the event that an inspection is not completed prior to the expiration of the warranty, it is the departments responsibility to ensure that the inspection still takes place; however, this inspection should be completed only with MDOT forces. 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. If segregation is observed, the paving operation should be stopped until the problem is corrected. The elevation of a fresh mat in relation to the base. This guidance takes effect as of August 29, 2016. The bond coat material must be applied with an approved distributor with a uniform spray. This point is called the tow or pull point. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List 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. Resources for local governmental agencies that regularly require access to state right of way. Placing the mat too thin based upon the aggregate size. It is very important to know what special provisions are contained in the proposal. 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. Hand tools, level, straightedge and boards. The roller speed selected is dependent upon a combination of factors: productivity, layer thickness and the position of the roller in the compaction process. Bond coat shall be applied to the taper before the adjacent lane is placed. 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 augers are used to distribute the mixture across the total width of the screed. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. This description is referenced in item number 112 of the Michigan Structure Inventory and Appraisal Coding Guide. 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. Pressure distributors are used to apply a uniform application of the asphalt emulsions, normally referred to as the tack or bond coat. The bond coat material shall be applied ahead of the paving operation for a distance of at least 1500 feet, depending upon traffic conditions, as determined by the Engineer. 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 Final Report Part 3 The asphalt cement delivery system must be calibrated. 2 0 obj Stopping the paver and allowing the screed to settle into the mat. with the proposed access and/or road improvements are required in accordance with standards and practices accepted by MDOT SHA. It is very important that proper air pressure be maintained in all tires. @c0M8;\ r)]-f3E|r ZVu~[ 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. 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. The details of the quality control program, both on the part of the Contractor and MDOT, should be discussed so that everyone is aware of who is responsible for performing the procedures and when they will be done. The inspector should check the placement yield occasionally. Many pavers are equipped with a truck hitch that is located beside the push rollers. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. The document has moved here. Did the paver have to stop and wait for trucks? Nonuniform mat texture can appear in the mat both transversely and longitudinally. Sampling frequency required is based on the percentage/tonnage of RAP that will be utilized on the project. This special provision applies to all Hot Mix Asphalt (HMA) acceptance testing for all Road Commission for Oakland County (RCOC) roads. Distributor Checklist - Manufacturer and Distributor Number -______________________________. Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. Refer to Figure 502-9. The rolling zone should be kept as short as possible. This leveling device is 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 under it. Resources for MDOT real estate standards, policies and procedures, and training. The rollers behind the first paver should stay 1 foot away from the free edge toward the second paver. Local Bridge Advisory Board Contact Information, Local Bridge Program Public Meeting Announcements, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change Pneumatic tire rollers are required for initial compaction on all base and some leveling courses to knead the material into all cracks and depressions for better density. of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. Common Safety Countermeasures for Local Agencies for Segments and Intersections {7:r!> -)t=:NuL5oqba5q]oe`0jC When the paver starts, go to paving speed as fast as possible. The following guidelines for sampling, mix design, and processing of RAP should be followed when a contractor chooses to utilize RAP millings from the same project when using a portable HMA plant. An asphalt mix that has all the desirable mix design characteristics will perform poorly, if not compacted to the proper density. This type of roller must be equipped with a skirt around the bottom of the roller and within 3 inches of the new surface. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. Whether you are from out of state or right here in Michigan, we want to ensure your travel throughout Michigan is informative, comfortable, and fun. The elevation of the string line must be set by a survey crew and the set line must be very taut. Not all of these tools are necessarily used on every project, or every day of a particular job. This is a certified product and the suppliers must be on the Certified Products List. The density obtained by the paver screed is also a function of the speed of the paver. When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. MDOT's A/E internal guidelines, and federal laws and regulations. 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 [email protected] After a short mixing process, the asphalt cement is added and the entire mixture is mixed for 30 to 45 seconds. Communication cannot stop once the pre-production meeting is concluded. Is the automation ski of proper length 30 feet +/- for all courses except last pass top course? After production begins, the Contractor may ask for JMF adjustments. 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. The certification is normally completed by the Region Traveling Mixture Inspector (TMI) before the Contractor starts his first project in the spring. The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. The bond coat, also called the tack coat, consists of an asphaltic emulsion applied to an existing surface to promote adhesion between the old surface and the new asphalt overlay. Is distributor tachometer working properly? The web Browser you are currently using is unsupported, and some features of this site may not work as intended. **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. 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