506 ALASKA 2020 SECTION 719 STEEL, GRAY -IRON AND MALLEABLE -IRON CAST INGS
719-2.01 SCOPE. Steel, gray -iron and malleable- iron castings intended for various uses as
shown on the Plans.
719-2.02 GENERAL REQ UIREMENTS. Meet the size and dimensions shown on the Plans, be
true to pattern in form, and conform to the following specifications. Carbon Steel Castings AASHTO M 103, Grade 65- 35 Chromium Alloy Steel Castings AASHTO M 163, Grade CA -15 Gray -Iron Castings AASHTO M 306 and AASHTO M 105, Class 35B Malleable- Iron Castings ASTM A47, Grade 32510 507 ALASKA 2020 SECTION 720 BEARINGS
720-2.01 ELASTOMERIC BEARING PADS . Elastomeric bearing pads include plain pads,
consisting of elastomer only, and laminated pads with steel laminates.
1.General . Meet AASHTO M 251, with the following revisions: 4.1 Properties of the Elastomer Delete the first sentence and replace with the following: Use elastomeric compound in the construction of the bearings containing only virgin natural polyisoprene (natural rubber) as the raw polymer. Do not use neoprene. Properties and requirements elsewhere in AASHTO M 251 pertaining solely to polychl oroprene (neoprene) do not apply. Add the following: Use elastomer compound classified as low temperature Grade 5 and meeting the requirements of paragraph 8.9.1.
5.FABRICATION Add the following paragraph: 5.5. Fabricate pads over 3/4 inch thick with alternating laminations of elastomer and metal or fabric reinforcements. The outside laminations must be metal or fabric with a minimum elastomer cover as shown on the Plans. Table 2 – Tolerances. Delete Item 6 and replace with the following:
6.Top, bottom, and edge cover of embedded laminates or connection members - 0, +1/8 inch.
2.Certification. Furnish a Certified Test Report from the manufacturer or an independent testing laboratory containing a list of dimensional, chemical, metallurgical, electrical, ph ysical, and other required test results of the specified material certifying that the product or assembly has passed all specified tests. Include the following:
a.the project name and number;
b.the manufacturer's name;
c.the name of the product or assembly;
d.a complete description of the material;
e.country of origin;
f.the lot, heat, or batch number that identifies the material;
g.all required test results for the specified material from the same lot, heat, or batch defined in Subsection 720- 2.01.2.f; and
h.a statement, signed by a person having legal authority to act for the manufacturer or the independent testing laboratory, that the test results show that the product or assembly to be incorporated into the project has been sampled and tested and the samples have passed all specified tests.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 534–534 of 584.