714.01 714-1 SECTION 714 PRESTRESSED UNIT MATERIALS
714.01 Prestressing Steel. Prestr essing reinforcement shall be manufactured from high tensile
strength steel or alloyed steel. Reinforcement size and grade shall be designated in the Contract. Prestressing steel materials shall meet the appropriate following requirements:
1.Seven wire steel strand shall meet the requirements of AASHTO M 203. All furnished strand shall be "weldless" per AASHTO M 203, subsection 8.1.4. The Contractor shall furnish one test specimen per coil. Each test specimen shall be 5 to 6 feet long.
2.High tensile alloy bars shall meet the requirements of AASHTO M 275. Unless otherwise approved by the Engineer , the Contractor shall furnish two test bars per diameter size, per heat number. Each test bar shall be 5 feet in length. All testing specimens shall be furnished free of cost. If test specimens are not delivered in time for tests to be performed before time of use, the Contractor may elect to incorporate materials into the work at the Contractor's own risk. All test specimens shall be representative of the furnished material lot. If ordered by the Engineer , selection of test samples shall be witnessed by the Engineer's representative, at any location chosen by the Engineer. All prestressing unit materials shall be subject to interim inspection and testing, before, during and after incorporation into the work, as ordered by the Engineer .
714.02 Anchorage Assemblies. If the anchorage assemblies are not attached to the
reinforcement samples, the Contractor shall furnish two anchorage assemblies, complete with distribution plates, for each size or type to be used when requested by the Engineer .
714.03 Post-tensioning Products. The following lengths of materials shall be furnished by the
Contractor :
1.For strand to be furnished with fittings; 5 feet between near ends of fittings.
2.For bars to be furnished with threaded ends and nuts; 5 feet threads at ends. 714.03 714- 2 THIS PAGE INTENTIONALLY LEFT BLANK 715.01 715-1 SECTION 715 LIGHTING AND ELECTRICAL MATERIALS
715.01 General. Materials shall be of a standard line from a manufacturer that has at least
three installations of the same type that have been installed and active for a minimum of one year. Electrical material shall be listed by the Underwriters’ Laboratories, Inc. (UL), and shall conform to the current edition of the National Electrical Code (NEC) . Material shall be the same as, or compatible with, that used and accepted by the agency responsible for maintenance. The Contractor shall coordinate and conduct a final inspection with the Engineer and each Owner upon completion of construction. This inspe ction shall assure that all lighting and electrical materials comply with these requirements. The Engineer will obtain the Owner’s written approval before accepting the work. The Engineer may inspect all lighting and electrical materials and accept or reject them at the project site. Samples may be taken, or manufacturer's certifications may be accepted in lieu of samples.
715.02 Light Standard Foundations and Concrete Foundation Pads. Concrete shall be Class
BZ for cast -in-place concrete foundations. All concrete shall conform to Section 601. Anchor bolts shall be designed by the Contractor's Engineer and shown on the working drawings, or as provided by the pole manufacturer. The threaded ends of the anchor bolts, the nuts, and the washers shall be galvanized per ASTM A153. Galvanizing on anchor bolts shall extend 2 to 4 inches beyond the threads. Reinforcing steel shall conform to Section 602.
715.03 Light Standards.
a.General . Structural components of light standards, bases, couplers, anchor bolts, luminaires, and other attachments to be used for lighting shall be designed for a minimum of 120 MPH wind speed, per AASHTO’s LRFD Specifications for Structural Supports for Highway signs, Luminaires, and Traffic Signals, Figure 3.8.2 . For special wind regions, the wind speed shall be per AASHTO’s Section 3.8.3. The CDOT Bridge Design Manual, Section 32.3 shall be used for Owner approved wind speeds. Breakaway bases and couplers shall meet the breakaway requirements specified in AASHTO's LRFD Bridge Design Specifications Section 12. Conformance shall be verified by crash tests reviewed and accepted by FHWA. A certificate of compliance shall be provided.
b.Metal Light Standards . Metal light standards shall be fabricated of either steel or aluminum, unless otherwise specified. Whenever the light standard metal is not specified, the Contractor may furnish either steel or aluminum. Material type and shape of light standards shall be the same throughout the project, unless otherwise shown in the Contract. Metal poles shall be tapered and shall be supplied with pole caps. Standards shall have cable -entrance holes located in conformity with the type of arm mounting used. Metal surfaces shall be free of imperfections marring the appearance and of burrs or sharp edges that might damage the cable.
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 897–898 of 943.