TOLERANCE FOR FINISHED OR FORMED CONVENTIONAL CONCRETE SURFACES
The offset between concrete surfaces
under adjacent pieces of formwork ......................... 1/8 in.
of formwork .............................................. 1/8 in.]
(3)
Gradual variation
Surface finish tolerances as measured
by placing a freestanding (unleveled),
5-ft straightedge for plane surface or
curved template for curved surface
anywhere on the surface and allowing it
to rest upon two high spots within 72 hr
after concrete placement. The gap at any
point between the straightedge or template
and the surface shall not exceed .......................... 1/4 in.
(4)
Offsets of adjacent precast gallery
segments shall not exceed ................................... 1 in.
1.4.2
RCC Surfaces
a. Variations from the lines and grades of the gallery walls and
ceiling from that shown in the drawings shall not exceed plus or minus
75 mm 3 inches except tolerances at the gallery entrances shall be kept
within the limits necessary for the bulkheads and doorways to fit and
function as designed.
b. Allowable variation from lines and grades of the downstream face of
the dam (measured in any direction) shall be minus zero (-0) (no under
build allowed) and plus 100 mm 4 inches, [except that the elevation and
shape of the spillway stilling basin training walls shall be such that
the training walls match with the downstream face as shown in the
drawings or otherwise provided for]. See additional restrictions in
paragraph DOWNSTREAM FACE.
c. The thickness of compacted lifts of RCC shall be within plus or
minus 50 mm 2 inches of that specified.
d. The elevation of the surfaces of RCC lifts upon which subsequent
RCC or conventional concrete is placed shall not vary more than 150 mm
0.5 ft from the design elevation, except that the elevation of the top
three lifts of the dam shall be within 60 mm 0.2 ft of that shown.
e. The location of anchor bars, waterstops, contraction joints, and
drain holes shall be within 150 mm 0.5 ft of the designated locations
shown.
f. The spacing of individual reinforcing steel bars in RCC shall be
within 50 mm 2 inches of that shown.
g. Tolerances for exposed surfaces of upstream face concrete [, the
face of the spillway chute,] and any other conventional concrete that
interfaces with the RCC shall be in accordance with paragraph
CONVENTIONAL CONCRETE SURFACES.
SECTION 03701
Page 19
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