96E03/29/06

S717-96E.doc

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  Include the following when using relatively small amount of structural
  steel. AASHTO M270 steel is not readily available for rolled shapes and
  small quantities.

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**Section 717. - STRUCTURAL METAL**

**717.01 Structural Steel.** [Delete the text and substitute the
following:]{.underline}

**(a) Structural carbon steel.** Structural carbon steel for riveted,
bolted, or welded construction shall conform to ASTM A36. In addition,
steel for primary bridge members and fracture critical bridge members
shall meet the supplementary requirements for Charpy V-notch test.

**(b) High-strength low-alloy structural (HSLA) steel.** High-strength,
low-alloy structural steel, or steel acquiring enhanced atmospheric
corrosion resistance for riveted, bolted, or welded construction, use
steel conforming to ASTM A588. In addition, steel for primary bridge
members and fracture critical bridge members shall meet the
supplementary requirements for Charpy V-notch test.

**(c) Bolts and nuts.** Conform to ASTM A 307.

**(d) High-strength bolts, nuts, and washers.** Conform to either AASHTO
M 164 or AASHTO M 253, as specified. Use Type 3 bolts in combination
with unpainted weathering structural steel.

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  Include the following whenever steel castings may be required or
  permitted.

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**717.04 Castings.**

**(a) Steel castings.** [Delete the text and substitute the
following:]{.underline}

Conform to AASHTO M 103, grade 70-36.

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  When steel pipe is specified, include the following:

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**717.06 Steel Pipe.** [Delete the text and substitute the
following:]{.underline}

Furnish galvanized steel pipe conforming to ASTM A 53, type F, standard
weight class, and plain ends for the designation specified in the
contract.

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  When steel grid floors are specified, include the following:

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**717.09 Steel Grid Floors.** [Delete the text and substitute the
following:]{.underline}

Conform to ASTM D5484 type I. Furnish galvanized steel grid floors
unless painting is specified.

**717.10 Elastomeric Bearing Pads.** [Delete the title and text and
substitute the following:]{.underline}

**717.10 Bearings.**

**(a) Elastomeric bearings, plain or laminated.** Conform the AASHTO M
251.

**(b) Elastomeric bearings, high load rotational confined.** Conform to
ASTM D 5212.

**(c) High lead rotational spherical bearings.** Conform to ASTM D 5977.

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  When tetrafluoroethylene surfaces for bearings are specified, include
  the following:

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**717.11 Tetrafluoroethylene (TFE) Surfaces for Bearings.** [Delete the
title and text and substitute the following:]{.underline}

**717.11 Polytetrafluoroethylene (PTFE) Surfaces for Bearings.** When
PTFE surfaces are

specified for bearings which are not listed in subsection 717.10,
conform to the following:

**(a) PTFE resin.** Furnish virgin PTFE resin material conforming to
ASTM D 4895 and the following:

> **(1)** Specific gravity 2.13 to 2.19
>
> **(2)** Melting point 623º F ± 2ºF

**(b) Filler material.** Furnish milled glass fibers, carbon, or other
approved inert material.

**(c) Adhesive material.** Furnish epoxy resin adhesive conforming to
FSS MMM-A-134, FEP film, or an approved equal.

**(d) Unfilled PTFE sheet.** Furnish unfilled PTFE sheet made from PTFE
resin. Conform to the following:

> **(1)** Tensile strength, ASTM D 638 2,800 psi min.
>
> **(2)** Elongation, ASTM D 638 200% min.

**(e) Filled PTFE sheet.** Furnish filled PTFE sheet made from PTFE
resin uniformly blended with filler material. For filled PTFE sheets
containing glass fibers or carbon, conform to Table 717-1.

**(f) Fabric containing PTFE fibers.** Furnish fabric made from oriental
multi filament PTFE fluorocarbon and other fibers. Use PTFE fibers
conforming to the following:

> **(1)** Tensile strength, ASTM D 2256 24,000 psi min.
>
> **(2)** Elongation, ASTM D 2256 75% min.

**Table 717-1**

Filled Polytetrafluoroethylene Sheeting

+-------------------+----------------+----------------+---------------+
| **Property**      | **ASTM         | **15% Glass    | **25%         |
|                   | Method**       | Fibers**       | Carbon**      |
+-------------------+----------------+----------------+---------------+
| Mechanical:       | D 638          | 14 MPa         | 9 MPa         |
|                   |                |                |               |
| Min. Tensile      | D 638          | 150%           | 75%           |
| strength          |                |                |               |
|                   |                |                |               |
| Min. Elongation   |                |                |               |
+-------------------+----------------+----------------+---------------+
| Physical:         | D 792          | 2.20           | 2.10          |
|                   |                |                |               |
| Min. Specific     | D 638          | 620 ± 18ºF     | 620 ± 18ºF    |
| gravity           |                |                |               |
|                   |                |                |               |
| Melting point     |                |                |               |
+-------------------+----------------+----------------+---------------+

**(g) Interlocked bronze and filled PTFE components.** Furnish a
phosphor bronze plate conforming to AASHTO M 108 with an 0.10 inch thick
porous bronze surface layer conforming to ASTM B 103 into which is
impregnated a PTFE compound. Overlay the surface with compounded PTFE
not less than 0.001 inches thick.

**(h) PTFE metal composite.** Furnish virgin PTFE molded on each side
and completely through a 1.32 inch perforated stainless steel sheet
conforming to ASTM A 240 type 304.

**(i) Surface treatment.** For epoxy bonding, factory treat one side of
the PTFE sheet with a sodium naphthalene or sodium ammonia process.

**(j) Stainless steel mating surface.** Conform to ASTM A 240 type 304
and the following:

> **(1)** Thickness 0.0359 in min.
>
> **(2)** Surface finish 20 µ inch root mean square max.

Polish or roll stainless steel mating surfaces as necessary to meet the
specified friction properties.

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  When aluminum alloy for bridge rail is specified, include the
  following:

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**717.13 Aluminum Alloy for Bridge Rail.** [Delete the text and Table
717-3 and substitute the following:]{.underline}

Conform to AASHTO-AGC-ARTBA "A Guide to Standardized Highway Barrier
Hardware."

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  When elastomeric compression joint seals are specified, include the
  following:

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**717.16 Elastomeric Compression Joint Seals.** [Delete the text and
substitute the following:]{.underline}

Conform to AASHTO M 297.