If the FHWA design method is used, the modifications in FHWA
NHI-00-043 shall be implemented.
c. The coefficient for direct shear of the reinforcement on a
soil similar in gradation and texture to the material that will be
used for fill in the reinforced zone shall be established in
accordance with ASTM D 5321.
d. The coefficient of interaction for pull-out resistance of
the reinforcement in a soil similar in gradation and texture to
the material that will be used for fill in the reinforced zone
shall be established in accordance with GSI GRI GT6.
Calculations[; G][; G, [_____]]
Calculations of the long term design strength for the
reinforcement in accordance with the NCMA or FHWA design method.
The ultimate strength or index strength shall be based on the
minimum average roll value tensile strength of the product using
the wide width strength test in ASTM D 4595. The calculation
shall itemize each reduction factor and include backup data to
justify each reduction factor.
Design calculations, including computer output data and program
documentation. The calculations shall include all items described
under PARAGRAPH: SEGMENTAL RETAINING WALL DESIGN.
SD-04 Samples
Segmental Concrete Units[; G][; G, [_____]]
Two samples of each proposed block. Each sample shall be
typical of the size, texture, color, and finish.
Reinforcement[; G][; G, [_____]]
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NOTE: The geogrid sample is intended to be for
visual demonstration prior to product delivery.
Quality assurance testing, if performed, should be
obtained from material actually delivered to the
job. If testing is to be performed for pre
qualification, the minimum sample size should be 1
meter (36 inches) in length and the full roll width.
Although 1 square meter (yard) will provide enough
material for testing, the full roll width should be
sampled since it provides a better selection of
specimen locations, it clearly shows the machine and
cross directions, and the difference in waste and
shipping costs is negligible.
**************************************************************************
Samples of each type of reinforcement. The samples shall be
labeled and have a minimum size 200 by 250 mm 8 by 10 inches.
Geogrid shall include at least 2 apertures (3 junctions) in each
direction.
SD-07 Certificates
SECTION 02832
Page 9
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