3.4
BLOCK INSTALLATION
The wall system components shall be constructed in accordance with the wall
supplier's recommendations and construction manual. Damaged blocks shall
not be incorporated in the retaining wall.
a. Block placement shall begin at the lowest leveling pad elevation.
The blocks shall be in full contact with the leveling pad. Each course
of block shall be placed sequentially for the entire wall alignment to
maintain a level working platform for layout of reinforcement and
placement of fill.
b. The grade and alignment of the first course shall be surveyed and
the results furnished to the Contracting Officer prior to placing the
second course. Survey control for alignment shall include a string
line, offset from a base line, or suitable provisions that can be
reproduced for quality assurance.
c. The blocks shall be placed with the edges in tight contact. [No
gap shall be allowed for wall batter and curvature.] The vertical
joints shall be maintained with a minimum 100 mm 4 inch overlap on the
underlying block. Coping required to keep block alignment shall be
done with a full depth saw cut. No splitting shall be allowed.
d. Stacking of blocks prior to filling any lower course of block with
drainage aggregate will not be allowed.
e. Cap units [and the top two course of blocks] shall be joined using
masonry adhesive. Care shall be taken to keep adhesive from coming
into contact with the face of wall units.
3.5
REINFORCEMENT INSTALLATION
a. Before placing reinforcement, the subgrade or subsequent lift of
fill shall be compacted and graded level with the top of the blocks.
The surface shall be smooth and free of windrows, sheepsfoot
impressions, and rocks.
b. Reinforcement shall be placed at the elevations and to the extent
shown on the construction drawings and the approved shop drawing
submittal. Reinforcement shall be oriented with the design strength
axis perpendicular to the wall face. Each segment of reinforcement
shall be continuous. Spliced connections between shorter pieces of
reinforcement will not be allowed. Reinforcement strips shall be
placed immediately next to adjacent strips to provide 100 percent
coverage.
c. The reinforcement shall be installed in tension. The reinforcement
shall be pulled taut and anchored with staples or stakes prior to
placing the overlying lift of fill. The tension shall be uniform along
the length of the wall and consistent between layers.
d. All reinforcement shall be 100% covered by soil so that
reinforcement panels do not contact in overlaps. Where the wall bends,
a veneer of fill shall be placed to a nominal thickness of 75 mm 3
inches to separate overlapping reinforcement.
SECTION 02832
Page 22
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