The Table of Contents for this section is available.
The work covered by this section consists of furnishing and maintaining a field laboratory for the exclusive use of the Engineer at concrete plants producing Portland cement concrete for use in pavement to be constructed on the project.
The Contractor shall furnish and maintain for the exclusive use of the Engineer a field laboratory in which to house and use all testing equipment needed. It shall be dust and water tight, floored, and have an adequate foundation so as to prevent excessive floor movement. It shall contain 6 or more 110 volt electrical double outlets properly grounded and spaced; a telephone; at least 2 windows, satisfactory locks on all doors and windows; adequate lighting, heating, and air conditioning; sink; running water to sink; and satisfactory exhaust fan. It shall also meet the following approximate minimum requirements: 200 square feet of floor space; 10 feet interior width; 6 feet 6 inches interior height; 20 square feet of counter space, 30-36 inches high and 2 feet deep with cabinets or drawers below the counter top; and 6 square feet of desk space not enclosed with cabinets. The laboratory shall be located in a position which will permit full view of the plant from the interior of the laboratory. At or near the laboratory, the Contractor shall furnish toilet facilities, with waste disposal, available for use of the Department personnel. These toilets shall be maintained in a neat and clean condition.
The Contractor shall provide a curing shelter adjacent to the laboratory which shall be at least 200 square feet in area, approximately 10 feet wide, 20 feet long, and 7 feet in height. A workbench which is approximately 10 feet long, 2 feet wide, and 2 feet high shall be provided across the end of the shelter. The shelter shall contain a sand bed at least 1 foot deep, and approximately 100 feet wide and 14 feet long, which is enclosed on all 4 sides by timbers. The shelter shall be equipped with curtains made of burlap, canvas, or other suitable materials, that may be raised or lowered to protect the sand bed and workbench from the sun. A wooden mixing board at least 3/4 inch thick and approximately 4 feet wide and 4 feet long, which is covered on one side with sheet metal of at least 22 gage, shall be furnished at the shelter. A water supply shall be available to maintain the sand bed in a moist condition. The Contractor shall provide facilities to maintain the test beams at temperature between 60°F. and 80°F. during curing.
In lieu of equipping the curing shelter with a sand bed as required above, the Contractor may provide a similar facility meeting all of the above requirements except equipped with water-lime storage tanks. The water-lime storage tanks shall be constructed of non-corroding materials and have provisions for automatic control of the water temperature. The water-lime solution in the tank shall be maintained at a temperature of 73°F. ±3°F. Each tank shall be equipped with a recording thermometer with its bulb located in the water-lime solution. The Contractor shall provide the lime required to make and maintain the water-lime solution. The Contractor shall provide sufficient tank volume to maintain all beams, stored with the long axis vertical, in a fully submerged condition for the duration of the required curing period.
Payment at the contract lump sum price for "Field Laboratory Rental, Portland Cement Concrete Pavement" will be made for furnishing and maintaining all field laboratories which have been made 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 proportional to the percentage of portland cement concrete pavement which has been placed at the time the partial pay estimate has been prepared.
Such price and payment will be full compensation for all work of furnishing and maintaining all field laboratories required by this section, including but not limited to providing and maintaining the building or trailer and the curing shelter; furnishing line; furnishing water, heat, electricity, and other utility services; and any other equipment that may be necessary.
Payment will be made under:
Field Laboratory Rental, Portland Cement Concrete Pavement Lump Sum