Never empty the paver hopper while paving. The MDOT plant inspector should follow the sampling and testing procedures explained in the Special Provision 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. endstream endobj See Figure 502-4. 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 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. Resources for truckers regarding necessary rules, guidelines, restrictions, and permits, needed to safely transport goods throughout Michigan. Plan Approval. A release agent may be applied to the surfaces of the truck or trailer bed. Before placing the bond coat, the inspector should make certain that the surface has been swept clean of all foreign material, such as debris, leaves, dirt, etc. 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. Grey goos vodka - Der Gewinner . MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. Rollers can also be a combination of both pneumatic and steel wheel. The batch plant consists of the cold feed system, individual bins that hold and feed the aggregate to the drum dryer (Figure 501 3). Of sufficient weight and strength to resist tearing. 311 0 obj <>stream Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. These adjustments should be completed within the first two loads placed. If the millings have aggregates larger than what is required for the mix design, it should be processed (crushed and/or screened) prior to stockpiling*. Fuel oil is not permitted for use on tapered joint rollers and mobile mat reference wheels. MDOT should not rely on the contractors daily report for quantities or as a replacement for the MDOT Inspectors Daily Report. Large enough to cover the top of the load and extend over sides and tailgate. Sampling methods and frequencies should be discussed. This nonuniform texture can be caused by many factors: screed extensions not level with each other, running the hopper empty between trucks, unevenly worn screeds, cold mix, or improperly emptying the paver wings. The outcome of each conversation must be recorded; who told whom to do what, and what was the reply? Research Administration supports and promotes innovative research that encourages safe, sustainable and cost-effective transportation solutions throughout Michigan. FY 2013 Before and After Crash Study All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be thoroughly cleaned. Advisories The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. The 2015 Office of Auditor Generals (OAG) audit of the warranty program found deficiencies in all aspects of the warranty administration process. Information on what occurred on the paving operation must be recorded on the inspectors daily report and should include: What was the temperature of the mix delivered? Stop the paver at this point, remove it from the roadway and remove any excess HMA material from the roadway. Did the paver have to stop and wait for trucks? FY 2024 Electronic Application Submittal Form In addition, a RAP scalper screen is required**. Enough tie-down points to secure properly and prevent flapping. This skirt will help keep the tires hot by holding the heat from the mix under the roller. Plan Submittal. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. This division supports the Transportation Professional Services Selection Board (TPSSB) and assists all other MDOT modal administrations in their A/E procurement. It shall be capable of maintaining the asphalt emulsion at the specified temperature. The desired degree of cross slope is dialed into the slope controller. Job mix formula adjustments, retroactive. Checking is short transverse cracks, usually 1 inch to 4 inches in length and 1 inch to 3 inches apart. FY 2025 Local Bridge Program Call For Applications - Due April 2022 This dryer heats the aggregate to the desired temperature and delivers the material to the hot bins in the tower unit. The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. Permits and Utility Coordination 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 slat conveyors in the bottom of the hopper should not be visible when the wings are emptied. The amount bid for HMA may be adjusted. An asphalt mix that has all the desirable mix design characteristics will perform poorly, if not compacted to the proper density. Rocking slabs must be stabilized. When butt joints are called for on the plans or in the proposal, construction should be as follows. The typical equipment used: Used for cleaning the old surface to be paved. 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 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 transverse joint in all courses must be carefully constructed and thoroughly compacted to provide a smooth riding surface. The flow gates should be adjusted to provide a uniform head of material in front of the screed. endobj Revisions to the HMA-QC Plan may be required by the Engineer prior to its approval. When cold-milling by the ton is a pay item, a weigh person will be needed. Once this has been done, complete the rolling of the joint. If two pavers running in echelon are used, the construction of the joint is similar to the building of a joint against a cold compacted pavement. Does the paver have reverse pitch augers or paddles at center of paver? Resources for the development of quality transportation project documents and services. Project mixture and testing Special Provisions. Figure 502-16 shows an example of a coring documentation form. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. This equipment must be safe, environmentally acceptable and capable of producing a specification product. 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 thickness of each course generally should not exceed 3 inches. Before the automatic screed controls are engaged, the screed must be nulled before paving starts and the proper angle of attack must be set. NEPA Guidance The paint dot is to be visible on the core during handling and testing. The top of the cover should be set 1/8 inch lower than the string line, adjusted to the elevation of the planned overlay. To reach the required density, the quickest initial compaction should occur directly behind the lay down machine. 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. 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. The names and titles of any people involved in the discussion should be written down, as well as the topics discussed. Incorporating Safety into Resurfacing and Restoration Projects Before placing any HMA patch, the area to be patched must be cleaned and a bond coat applied. 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 Generally speaking, this means that vibratory rollers normally operate in the 2 to 3 mph range. This information must be detailed and complete. It is the backbone of Michigans 120,000-mile highway, road and street network. The function of the hot mix plant is to heat the aggregates, add the asphalt cement and produce a homogenous asphalt mixture. 111 0 obj <>stream b. Too Hot: Blue smoke rising from the mix usually indicates an overheated truckload. 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. The people most likely to be hurt on an asphalt paving project are those individuals who are new to this type of work. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. If the end of the lane is to be left open overnight, a ramp joint should be used. Typically, the string is supported on metal posts at 25 foot intervals. Document when immediate possession of the extracted cores occurs (core ID, date, time, etc.). Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. 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. When the paver stops, do it as fast as possible. Vibratory rollers come in a variety of configurations. Custom boutique photography for newborns, children, families, seniors, and weddings Interim and Final Inspection forms must be filled out even if there are no deficiencies and filed in ProjectWise. Depending on the material and job conditions, this can be quite dramatic. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. This arrangement can sense and correct any change in screed elevation. 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. Double-drum vibratory rollers come in single-articulated-frame and double-articulated-frame models. The number of rollers needed and the number of passes each roller needs to make will be based upon the mixture temperature and the rate at which the mixture cools. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. Before overlaying an old HMA pavement, it should be inspected. (Example: 6 percent grade - 6 inches (6 m) of elevation change in 100 feet (100 m) of horizontal longitudinal run). See Figure 502-6. Select all. To convert the yield to mat thickness, the following will be helpful: 110 pounds/square yard = 1 inch of thickness. MDOT has ongoing government-to-government communication with 12 federally recognized sovereign tribal governments whose lands are situated within Michigan. It is MDOTs responsibility to conduct quality assurance and verification sampling and testing to ensure conformity of the mix to 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.This testing is done at the field laboratory provided by the Contractor located at the asphalt plant or at an MDOT Region Lab. Hand raking and shaping around the cover must be completed before the material cools. The Internship Program offers undergraduate and graduate students interested in civil engineering and construction management careers, valuable experience by working with professional field staff. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. Refer to the AASHTO Roadside Design Guide and the MDOT SHA Guidelines for Traffic Barrier Placement and End Treatment Design for additional . At the bottom of the paver hopper is a set of slat conveyors. A paving schedule for the project should be presented and discussed with MDOT. This minimum rate should also be used between courses as a tack coat. Milling can be accomplished in any width necessary; however, the width is typically 6.25 feet. Failure to do so will jeopardize full federal-aid participation. of seven wheels? 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. `qr`@UtT! u#$$mB3B2(&qiB[g%R(ck7H,D"-Vg#Y 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. 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. Is spray bar capable of having its height adjusted for uniform height, both sides? Each MDOT region has several Transportation Service Centers (TSCs) that are designed to respond to the transportation needs of local communities. Most of our manuals, publications, and forms are available online. The aggregate base course must meet all the requirements for moisture content, density and smoothness. 2 0 obj At the end of this section there is a troubleshooting guide to help in assessing possible causes and fixes for surface defects. The mix is then dumped into a truck, or transferred to a hot storage silo to be loaded into a truck later. Functioning equipment parts, high temperatures, noise and moving delivery and haul trucks all add to the possibility of an accident occurring. 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. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. x 0 ;r0Do9r\( [v9pWnY?xF Refer to Section 403 of this manual for more information on adjusting drainage structure. Long delays, caused by the lack of trucks, or filling the roller with water, allow the roller to indent the new mat. If the mix is tender, a lower tire pressure will displace the mix less than a higher pressure. Figure 502-14 shows some typical surface patterns and the causes. The tiers identified below apply to Superpave It is also used in Mexico. 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