Reinforcement[; G][; G, [_____]]
Affidavit certifying that the reinforcement meets the project
specifications. The affidavit shall be signed by an official
authorized to certify on behalf of the manufacturer and shall be
accompanied by a mill certificate that verifies physical
properties were tested during manufacturing and lists the
manufacturer's quality control testing. [If the affidavit is
dated after award of the contract and/or is not specific to the
project, the supplier shall attach a statement certifying that the
affidavit addressed to the wholesale company is representative of
the material supplied.] The documents shall include a statement
confirming that all purchased resin used to produce reinforcement
is virgin resin. The mill certificate shall include the tensile
strength tested in accordance with ASTM D 4595.
1.4
MEASUREMENT AND PAYMENT
Measurement of segmental retaining wall for payment will be made on the
basis of the face area in the vertical plane of segmental concrete units.
The pay lines of the structure will be neat lines taken off the approved
shop drawings; and will extend from the block-leveling pad interface to the
top of wall, excluding any fencing or barrier. Payment will be made at the
respective unit price per square meter (SM) foot (SF) listed on the Bidding
Schedule. Payment will be full compensation for engineering services,
excavation and preparatory work, and furnishing all material, labor and
equipment to complete the work.
1.5
SEGMENTAL RETAINING WALL DESIGN
This work element includes engineering services in addition to the
construction requirements. The Contractor is responsible for engineering
services that include design of the wall in accordance with the National
Concrete Masonry Association design method, and providing shop drawings
indicating all features of the complete design. This work element includes
engineering in addition to the construction requirements. The NCMA design
method for segmental retaining walls considers potential failure modes
categorized by external, internal, local, compound, and global stability.
The Government has considered the global stability and has provided the
minimum design requirements on the drawings. The Contractor is responsible
for engineering services that include analysis of the wall for all modes of
stability, and providing shop drawings indicating all features of the
complete design.
1.5.1
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NOTE: The NCMA and FHWA design methods are nearly
identical. They differ primarily in the treatment
of the vertical component of active earth pressure
and the connection strength. The current (1998)
FHWA design results in a conservative connection
strength that only a small number of products meet.
The FHWA design method is less commonly used, except
in transportation related projects. The FHWA design
method may be required for works within highway
right-of-way.
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SECTION 02832
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