7-28 workbench to provide protection from weather. Provide, in the laboratory, an adequate
number of water storage tanks to hold all acceptance beams and cylinders and any additional beams and cylinders made for the purpose of determining early strengths. Construct the water stora ge tanks of non- corroding materials and have requirements for automatic control of the water temperature. Maintain the water in the tank at a temperature of 73°F ± 3°F. Equip each tank with a recording thermometer with its bulb located in the water. Provide sufficient tank volume to maintain all beams and cylinders, stored with the long axis vertical, in a fully submerged condition for the duration of the required curing period. Furnish a wooden mixing board at least 3/4 inch thick and approximately 4 f eet wide and 4 feet long that is covered on one side with sheet metal of at least 22 ga uge, at the shelter. Provide facilities to maintain the test beams and cylinders at temperature between 60°F and 80°F during initial curing.
725-3 Measurement and Payment
Field Laboratory Rental, Portland Cement Concrete Pavement will be paid at the contract lump sum price which will be made for furnishing and maintaining all field laboratories available for use by the Engineer at any concrete plant producing Portland cement concrete for use in pavement to be constructed on the project. Partial payments for field laboratory rental will be made with the first and last partial pay estimates which include concre te pavement or concrete shoulders. Payments will be made at the rate of 50% of the lump sum price for Field Laboratory Rental, Portland Cement Concrete Pavement on each of these partial pay estimates. Payment will be made under: Pay Item Pay Unit Field Laboratory Rental, Portland Cement Concrete Pavement Lump Sum
730-1 Description
Mill rumble strips on Portland cement concrete shoulders in accordance with the plans, and as directed by the Engineer.
730-2 Equipment
Provide equipment consisting of a rotary type cutting head with an outside diameter of no more than 24 inches and no less than 16 inches long. Provide a cutting head that has the cutting tips arranged in such a pattern as to provide a relatively smooth cut as well as a cutting head that is on its own independent suspension from that of the power unit to allow the tool to self-align with the slope of the shoulder and/or any irregularities in the shoulder surface. Provide a cutting tool equipped with guides to establish consistent alignment and uniformity of each cut in relation to the roadway.
730-3 Construction Methods
Demonstrate the ability to achieve desired surface inside each depression without tearing or snagging the Portland cement concrete prior to beginning the work. Provide rumble strips that have finished dimensions and pattern in accordance with the Roadway Standard Drawings . Material resulting from the operation shall become the property of the Contractor. Remove and dispose of material in accordance with Section 802. Remove all equipment to a location where it does not present a traffic hazard and clean pavement before reope ning work area to traffic.
7-29 730-4 Measurement and Payment
Milled Rumble Strips (Concrete Shoulder) will be measured and paid as the actual number of linear feet of shoulder, measured longitudinally along the surface of each shoulder, where rumble strips have been constructed and accepted. Payment will be made under: Pay Item Pay Unit Milled Rumble Strips ( Concrete Shoulder ) Linear Foot