The request will have the effect of increasing, not necessarily doubling the number of cores. November 2, 2011 Practices for Concrete Pavements. Tie bars are not load transferring device. Verify that Form CEM-3101, “Notice of Materials to Be Used,” includes concrete pavement materials. Tie bars are not load transferring device. Obtain physical specimens used for the contractor’s testing of coefficient of thermal expansion. Make sure water does not flow over or wash the concrete surface. Make additional sets of beams to determine acceptable flexural strength when pavement crossings will be open to public traffic or to job traffic earlier than normally permitted. Within 30 minutes of removing the specimens from their molds, cure specimens with free water maintained on their surfaces at all times at a temperature range of 70-77 degrees Fahrenheit using water storage tanks or moist rooms complying with the requirements of ASTM C511, “Standard Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes.”. AASHTO laboratory accreditation can be verified at the AASHTO re:source website: Determine the pavement climate region for your project by reviewing the pavement design information located on the typical cross section sheet, which may trigger additional concrete mix requirements such as required air entrainment. Note that tests performed before the concrete is 7 days old are not valid for acceptance. Drying of the surfaces of the beam shall be prevented between removal from water storage and completion of testing. These reports will help determine the cost to the contractor for secondary coring and provide a clear record of secondary areas. The cost of secondary thickness measurements was the cost of cores 7a-1 through 7a-3, 7b-1 through 7b-2, and 7c-1 (core taken after replacement of secondary unit). Can dowel bars be omitted in the joints of box culvert? For cold weather conditions, obtain the contractor’s plan for protecting concrete pavement. Final Curing for Acceptance: Upon completion of initial curing, transport specimens to the laboratory. Make sure acceptance testing is performed on concrete pavement in accordance with Section 40-1.01D(8), “Department Acceptance” of the. Verify that the contractor performs initial texturing with a broom or burlap drag to produce striations parallel to the centerline. Intermittent monitoring of the contractor’s adherence to their quality control plan. Constraction joint Types of Joints concrete construction Tie bars are deformed rebars or connectors used for holding faces of rigid slabs in contact to maintain aggregate interlock. Check that concrete pavement temperature is maintained above 40 degrees Fahrenheit during the initial 72 hours after placement. Continuous acceptance sampling and testing of fresh concrete. Disclaimer | Be alert for inoperative units, and verify that they are replaced immediately. vRecognize why joints are needed in a concrete pavement. To obtain the total amount of payment to deduct for the primary unit, multiply the deficiency adjustment by the total area of the primary unit in square yards. 1. You can list yourself here by submitting civil engineering related topics to us. Bank the sides and ends of the specimens with earth or sand that must be kept damp, leaving the top surfaces exposed to the specified curing treatment. Check that the forms are cleaned and oiled before each use. A single core was then taken to determine thickness variation and found to be -0.01 foot. The procedures and the dollar figures used for deductions from payments to the contractor used in the example are based on Section 40-1.01D(8)(c)(iv), “Thickness,” of the Standard Specifications. Obtain the contractor's quality control plan that details the methods the contractor will use to ensure the quality of the work. When these tie bars are used to connect two lanes, or a lane and shoulder, the tie bar may be mechanically inserted by the paving machine into the fresh concrete ahead of the float, or it may be held in position by support devices. Identify where the contractor will post quality control charts. Good communication between plant and inspection specialists and assistant resident engineers is essential. Where appreciable differences are encountered between the quality control tests and acceptance tests, investigate and resolve these concerns with aid of the district materials engineer as necessary. When long hauls are involved, review the contractor’s proposed placement method to verify that adequate time will be available. Discuss pavement areas to receive tapered edge with the contractor and construction methods to be used. The resulting value was used in the calculation instead of the thickness variation for Core 7 to determine the average thickness deficiency of the primary unit area. The engineer averaged thickness variations of the secondary thickness measurements outside the secondary unit area. Tie bars are also used in plain jointed concrete pavement. Mixing water with surface mortar during finishing reduces surface durability. When slipform pavers are used, tie bars are inserted on the slab edges that would become longitudinal joints. This section covers concrete pavement including: Plant inspection specialists and testing personnel usually perform inspection and testing duties at the concrete batch plant. Chapter 1 - Caltrans Construction Organization, 4-4002D Concrete Field Qualification and Pavement Test Strip, 4-4003E Measurement of Pavement Thickness, Table 4-40.1. The resulting distance is the primary coring interval. When a curing compound will be used, discuss the labeling and packaging requirements for acceptance of the compound with the contractor. Note the following for coefficient of friction: Areas with uniform surface texture require testing only at representative locations to assure that the required coefficient of friction has been provided. Verify that membrane material is placed and secured and that any damaged sheeting is repaired as the specifications require. Obtain calibration documentation and operational guidelines for frequency measuring devices for concrete consolidation vibrators. Tests made at temperatures lower than 40 degrees Fahrenheit will yield low results; therefore, do not rely on such tests as indications of failure. Following is an example illustrating the procedure for measuring the pavement for thickness and calculating deductions for thickness deficiencies. To determine the limits of the secondary unit, the resident engineer ordered secondary thickness measurements in the panels adjacent to the panel where Core 7 was taken. At the start of each day’s work, check that the specified date stamp is used to mark the new pavement. You may wave JIT training requirements for individuals who have attended equivalent JIT training within the last 12 months and have provided certification of completion documentation. Make sure the contractor submits a copy of the AASHTO accreditation for the laboratory performing the mix design. The plant before startup cracking, faulting, spalling, and treated permeable bases reasons placing! 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