Tie bars typically are used across the joints … Refer to Section 4-90, “Concrete,” of this manual for information on concrete mix designs. The resulting measurement is the area of the primary unit. Make the deficiency adjustment on the average thickness deficiency in the same manner as for areas that have been cored. Check that the contractor applies the curing compound uniformly after tining. The location of each core should be spotted on the pavement within “pacing accuracy” longitudinally and within about 1 foot laterally. The total area paved on this date was 8,400 square yards. Copyright Policy | Check that arrangements are made to evaluate the test strip within 3 business days of placement. Verify that equipment for constructing joints is onsite and that it conforms to specifications. Privacy Policy | As necessary, verify contractor’s analysis by performing an independent simulation using high performance concrete paving software. For continuously reinforced concrete pavements, obtain a plastic chair submittal and plastic chair sample if their use is proposed by the contractor. To determine the location of the first core, the engineer chose the outside lane (4), at random and used the seventh set of numbers at random, from Table 4-40.1, “Calculation Factors to Locate Cores.” The first core was taken at a longitudinal distance of 360 feet from the beginning and at a lateral distance of 4 feet from the right edge of the lane. When uneven settlement occurs, the tie bars in longitudinal joints perform as hinges (Ministry of Transport (1955)) which allow for the settlement of concrete carriageway. The resulting number is the number of primary cores to be taken, unless the contractor requests additional ones. A deduction was then taken on the remedied secondary unit as follows: 72 square yards x $0.90/square yard = $64.80. To determine the limits of secondary units, locate cores in approximately the center of each adjacent panel. A satisfactory moisture environment can be created during the initial curing of the specimens by one or more of the following procedures: (1) immerse molded specimens with plastic lids in water; (2) store specimens in a container or enclosure; (3) place specimens in damp sand pits; (4) cover specimens with plastic lids; (5) place specimens inside plastic bags; or (6) cover specimens with wet fabric. Store specimens representing pavement by placing them on the ground as molded, with their top surfaces up. When required, check that pressure relief joints are constructed as specified and shown on the plans. For information on producing and transporting concrete, refer to Section 4-90, “Concrete,” of this manual. Use the following procedure for determining pavement thickness and any applicable deductions: Do the following to locate primary cores: Locate the first core in any primary unit by starting at either end of the unit (preferably proceeding in the direction of increasing stations), and select a lane at random. The bounded area is referred to as a secondary unit. They are placed across transverse joints of concrete pavement to allow movement to take place. What is the difference between tie bars and dowel bars in concrete carriageway? Note the safety precautions in the test method. Standing bleed water may appear on the surface under certain conditions shortly after pavement is placed. • Tie bars : deformed rebars or connectors used for holding faces of rigid slabs in contact to maintain aggregate interlock. Across longitudinal joints, tie bars are provided These are the main types of joints in the rigid pavement. This section covers concrete pavement including: Plant inspection specialists and testing personnel usually perform inspection and testing duties at the concrete batch plant. If designed and installed properly, tie bars prevent the joints from opening and consequently improve load Do the following in examining equipment or tools: Examine the forms for specified attributes, including those for composition, weight, dimensions, and rigidity. Make sure the contractor sprays the concrete with a mist of water until the concrete has set before placing the membrane. In turn, locate the remaining primary cores in the lanes. Initial Curing: Store standard-cured specimens for as long as 48 hours after molding, while maintaining the temperature and moisture conditions specified in ASTM C31, Section 10.1.2.1. Note these areas in daily reports with stationing and offset information. 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