509.10 340 coating areas greater than 1/4 -inch (6 mm) square or 1/4 -inch (6 mm) diameter; approximately 1/8 -inch (3 mm) square or 1/8 -inch (3 mm) diameter if the opening is within 1/4 -inch (6 mm) of an equal or larger opening; or, a length of 6 inches (150 mm) regardless of area. Coating damage in cases where the damaged area is less than specified above need not be repaired. Use patching material of the same composition and quality as th e original coating. Prepare the surface to a near white metal. If repair is required, clean and repair the damaged areas and allow adequate cure time before placing concrete. The Engineer will approve the installation once patching has been done as outline d above.
509.10 Method of Measurement. The Department will measure Epoxy Coated
Reinforcing Steel by the number of pounds (kilograms) shown on the plans. Additional measurements or calculations are not required. If the Contractor believes the pay weight, a s shown on the plans, is in error, the Contractor is responsible to prove this discrepancy by recalculating the total weight for the reference number involved. The Contractor shall submit its figures to the Engineer for review and approval. The number of p ounds (kilograms) of reinforcing steel shall be the actual number of pounds (kilograms) of the various sizes incorporated in the concrete as shown on the plans, completed and accepted. If the weight of the reinforcing steel is recalculated, determine the n umber of pounds (kilograms) from the number, length, and weight of the bars as shown on the steel list of the plans, based on the weight per foot (meter) shown in the Table
509.05 1 (509.05 -1M) with deductions for bars not used, and addition for extra bars
used as directed by the Engineer .
509.11 Basis of Payment. The Department will not include the supports,
mechanical connectors, and tie wires in the calculated weights but will consider them incidental to the price bid. The Department will pay for accepte d quantities at the contract price as follows: Item Unit Description 509 Pounds (Kilograms) Epoxy Coated Reinforcing ITEM 510 DOWEL HOLES
510.01 Description
510.02 Materials
510.03 Drilling of Holes
510.04 Placement
510.05 Curing and Loading
510.06 Basis of Payment
510.01 Description. This work consists of drilling holes into concrete or
masonry, and furnishing and placing grout into the holes. The furnishing and placing of steel for dowels is included in Item 509. 510.02 341 510.02 Materials. Cement grout consists of one part of hydraulic cement conforming to Item 701 and three parts sand conforming to 703.03, by volume, and water. Furnish nonshrink, nonmetallic grout conforming to 705.20.
510.03 Drilling of Holes. Drill holes at the location and the depth shown on the
plans without spalling the concrete. Drill holes for cement grout at least 1/2 inch (13 mm) larger in diameter than the dowel bar. Drill holes diameters for nonshrink, nonmetallic grout at least 1/16 inch (1.5 mm) larger in diameter than the dowel bar. Drill hole for encapsulated type nonshrink, nonmetallic grout as recommended by the manufacturer. Instead of drilling holes, the Contractor may install formed holes with laitance removed.
510.04 Placement. Do not install grout if the temperature of the co ncrete into
which the grout is being placed is below 40 F (4 C). Force dowel bars into the holes, to the specified depth, spreading the grout around the bar and solidly filling the hole. Before installing cement grout and dowels, saturate cement grout dowel holes with water then blow out all excess water. Place enough cement grout to completely fill the holes during dowel installation. If cement grout does not completely fill the hole, remove the dowel, pour additional grout into the hole, and reinstall the dowel. Before installing nonshrink, nonmetallic grout and dowel, clean and dry the grout holes. Immediately after mixing, place a sufficient amount of nonshrink, nonmetallic grout to provide complete coverage around the dowel to ensure anchorage. If nonshrink, nonmetallic grout does not completely fill the hole, pour additional grout in until the hole is filled flush. Obtain the correct protrusion of the anchors or dowels, and hold dowels in the plan position within the holes until the grout has initia lly hardened. If horizontal holes are specified, provide a means of retaining the grout in the hole flush with the vertical face and remove this material after the grout has hardened. Do not use material for retaining the grout that bonds to the grout.
510.05 Curing and Loading . Before applying any stresses to dowels, cure
nonshrink, nonmetallic grout as follows: Daily Minimum Ambient Temperature Minimum Curing Time 33 to 50 F (1 to 10 C) 3 hours 51 to 68 F (11 to 20 C) 1 1/2 hours above 68 F (above 20 C) 1 hour
510.06 Basis of Payment. The Department will pay for accepted quantities at
the contract prices as follows: Item Unit Description 510 Each Dowel holes with cement grout 510 Each Dowel holes with nonshrink, nonmetallic grout