SCOPE
721.01.01 Materials Covered. This specification covers the quality and kind of materials used in the
construction of object markers and guide posts. REQUIREMENTS
721.02.01 Certificates. Furnish 2 certificates covering each order of material (plates, reflectors, and posts) by
the manufacturer, certifying that the product complies with the specifications. Deliver certificates at the time of, or before, delivery of the order. PHYSICAL PROPERTIES AND TESTS
721.03.01 Metal Posts. Posts shall be steel conforming to ASTM A 1011, Grade 275 (Grade 40), or ASTM
A653, Designation SS, Grade 275 (Grade 40), and be of 3.2 to 3.5 mm (10 or 11 gage) thickness. Galvanize metal posts according to Section 715, or ac cording to ASTM A653, coating designation Z700 (G235).
721.03.02 Target Plates. (a) Base Metal. Base metal for target plates shall be zinc -coated steel sheet or
aluminum sheet. The zinc -coated steel sheet shall comply with FSS QQ -S-775 Steel Sheet, carbon, zinc -coated Type 1, Classes d and e, except that the zinc -coated surface shall withstand a 180 degree bend on itself at room temperature without flaking the coating. Prepare the zinc -coated surface for painting by the application of phosphate coating. Accomplish the phosphatizing process without damaging or removing the galvanized coating from the steel base metal. Any evidence of damage or removal of the zinc coating shall be cause for rejection of the entire lot. Prepare the aluminum sheet for paintin g with a chemical conversion coating conforming to MIL- C-5541. Apply the coating according to the manufacturer’s specifications and recommended sequence of operation. Furnish 2 copies of certified mill tests of the aluminum sheets. Fabricate target plates from 1.0 mm thick (20 gage) steel sheet or 1.3 mm (0.05 in.) thick aluminum sheet, alloy 3005- H14 conforming to ASTM B209. Accomplish fabrication of all metal parts in a uniform and workmanlike manner. Cut plates to size and shape and punch the holes for mounting bolts and reflectors according to the details shown on the plans. Provide surfaces and edges of the plates free from defects resulting from fabrication.
b.Paint. Target plates shall have satisfactory paint adherence. Furnish metal reflector plates for metal guide posts with one or both sides coated with a black, baked enamel finish. If only one side is coated, the coated side shall face oncoming traffic. Coat the plates with baked enamel conforming to the following provisions: The enamel finish coat for plates shall comply to Federal Specification TT -E-489, Class B baking type enamel. Apply the enamel by spraying, rolling, or dipping. Other methods may be used provided they are approved before use. The dry film thickness of the baked enamel coating on the galvanized steel plates shall be not less than 50 μm (2 mils). The dry film thickness on the aluminum plates shall be not less than 38 μm (1.5 mils) if enamel is applied by spray or dip method and not less than 25 μm (1 mil) if enamel is applied by continuous roller coat method. Provide uniform coating which is smooth and free from flow lines, streaks, blisters, or other surface imperfections. Provide finished plates without dents and defects. The maximum surface deviation from a horizontal plane on which the finished plate lies shall not exceed 6 mm (1/4 in.). 721 OBJECT MARKERS AND GUIDE POSTS
c.Hardware. Hardware for attaching the target plates shall consist of 6 mm (1/4 in.) diameter galvanized steel or aluminum nuts and bolts or 5 mm (3/16 in.) diameter r ivets and washers. Commercial quality hardware will be acceptable.
721.03.03 Reflectors. Equip guide posts and object markers with Type IV, Type IX, or Type XI reflective
sheeting conforming to Subsection 716.03.01. The size of the sheeting shall be as i ndicated on the plans. The color of the sheeting shall be as indicated in the MUTCD. 569 SECTION 722 WATER SCOPE
722.01.01 Material Covered. This specification covers the quality of water.
REQUIREMENTS
722.02.01 General. Water for embankments, backfill, subgrade, base, landscaping, and surface courses and
cement concrete curing shall be free from an excessive amount of acids, alkali, oil, and other substances which will cause damage to the above mentioned items. PHYSICAL PROPERTIES AND TESTS
722.03.01 Concrete Use. Submit two, 1 liter (1 quart), samples of water for tests, obtained and shipped in clean
containers carefully packed and labeled. Tests will be made according to AASHTO T26. Water with a pH less than 4.5 or greater than 8.5 and a resistivity less than 500 ohm •cm will be tested according to AASHTO T26. Any indication of unsoun dness, marked change in time of setting, or a reduction of more than 10% in strength from results obtained with concrete mixtures containing the water of satisfactory quality shall be sufficient cause for rejection of the water under tests.
722.03.02 Cold Recycle Use. Submit a 1 liter (1 quart) sample of the water to be used a minimum of 15
working days before the start of cold recycle operations. The water shall not contain more than 500 ppm total sulfates.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 573–574 of 610.