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<br />,., <br /> <br />. <br /> <br />-, <br /> <br />. <br /> <br />700-3.4.3 Extruded Tubing: For extruded aluminum tubing, meet the <br />requirements shown in the plans. <br />700-3.4.4 Castings: Provide aluminum castings of the alloys shown in the <br />plans. For aluminum alternates the Engineer will allow a cast base, provided the Contractor <br />submits test reports giving evidence that the base to be used for each pole size is as <br />strong as the pole with which it is to be used. Perform physical tests and submit certified <br />reports for one base to be used with each pole size. Use Alloy A 356-T6 for the castings. <br />Use aluminum bolts for connecting parts of the cast base. <br />700-3.4.5 Channels: For aluminum channels, meet the requirements of <br />ASTM B 308 [ASTM B 308M] for the alloys shown in the plans. <br />700-3.4.6 Bolts, Nuts, and Lockwashers: For aluminum bolts, nuts, and <br />lockwashers, meet the requirements shown in the plans. Ensure that finished bolts and <br />washers are given an anodic coating of at least 0.0002 inch [5 ~tm] in thickness and are <br />chromate-sealed. <br />700-3.5 Steel: <br />700-3.5.1 General: Only use structural steel, including bolts, nuts, and <br />washers, that have been hot dip galvanized or metalized after fabrication. Perform hot dip <br />galvanizing in accordance with ASTM A 123 [ASTM A 123M] or ASTM A 153 <br />[ASTM A 153M] and metalizing in accordance with Section 562. For galvanized steel <br />members, except plate for sign panels, meet the general requirements of Section 962 and <br />the specific requirements of 962-7. For steel plate for use as sign panels, meet the <br />requirements of ASTM A 283 [ASTM A 283M] for either Grade C or Grade D. <br />700-3.5.2 Specific Uses of Aluminum and Galvanized Steel: Use aluminum <br />bolts, nuts, and hardware to connect parts of the cast base. <br />Use galvanized steel anchor bolts for anchoring base plates to <br />concrete bases and for the nuts and washers. <br />For all other metal parts, the Engineer will allow galvanized steel as an <br />alternate to aluminum. <br />700-3.6 Bearing Pads: For bearing pads, meet the requirements of 932-2. <br />700-3.7 Reflective Sheeting: Meet the reflective sheeting requirements of <br />Section 994. <br />700-3.8 Process Colors: Use transparent and black opaque process colors meeting <br />the requirements of 994-4 on reflective and nonreflective sheeting. <br />700-3.9 Demountable Sign Face Materials: For demountable sign face materials, <br />meet the requirements of Section 995. <br /> <br />. <br /> <br />..., <br />. <br /> <br />1"'"1 <br /> <br />. <br /> <br />.., <br />. <br /> <br />" <br />. <br /> <br />..., <br /> <br />. <br /> <br />II <br /> <br />. <br /> <br />" <br />. <br /> <br />..., <br />. <br /> <br />II <br /> <br />. <br /> <br />.., <br /> <br />. <br /> <br />,., <br /> <br />., <br /> <br />700-4 Preparation of Sign Blanks. <br />700-4.1 De-greasing and Etching for Aluminum Sign Blanks: <br />700-4.1.1 General: Prior to the application of reflective sheeting, use any of <br />the methods shown below to de-grease and etch the aluminum sign blanks. <br />700-4.1.2 Hand Method: Under this method, de-grease and etch the blanks <br />in one operation, using steel wool (medium grade) with any of the following combinations <br />of materials: <br />(1) An abrasive cleanser of a commercial grade kitchen scouring <br /> <br />. <br /> <br />,.., <br /> <br />. <br /> <br />,.., <br /> <br />. <br /> <br />~ <br />. <br /> <br />powder. <br /> <br />(2) Acid and a suitable detergent solution. <br />(3) An alkaline solution. <br /> <br />r""'I <br /> <br />. <br /> <br />.., <br /> <br />09/09 <br /> <br />01000-152 <br /> <br />03-4122.F <br /> <br />. <br />