1.5.2
Maximum Water-Cement (W/C) Ratio
**************************************************************************
NOTE: Consult EM 1110-2-2000 and the appropriate DM
to fill in the blanks and to select the appropriate
W/C. When cementitious materials other than
portland cement are used, see paragraph CONCRETE
PROPORTIONING, for definitions of W/C.
**************************************************************************
Maximum W/C shall be as follows:
WATER-CEMENT RATIO, BY MASS
STRUCTURE OR PORTION OF STRUCTURE
[0.40
[_____]]
[0.45
[_____]]
[0.50
[_____]]
[0.55
[_____]]
[0.60
[_____]]
[0.65
[_____]]
These W/C's may cause higher strengths than that required by paragraph
CONCRETE STRENGTH.
1.6
CONSTRUCTION TOLERANCES
**************************************************************************
NOTE: Finished or formed surfaces subject to
high-velocity flow (12 m/s (40 fps) and greater)
will meet the tolerances for Class A-HV surfaces
specified in paragraph Formed Concrete Surfaces
below.
**************************************************************************
Except as specified otherwise, a plus tolerance increases and a minus
tolerance decreases the dimension to which it applies. A tolerance without
sign means plus or minus. Where only one sign is specified, there is no
limit in the other direction. Tolerances are not cumulative. The most
restrictive tolerance will control. Tolerances shall not extend the
structure beyond legal boundaries.
a. Level and grade tolerance measurements of slabs shall be made
as soon as possible after finishing. When forms or shoring are
used, the measurements shall be made prior to removal.
b. Construction tolerances shall meet the requirements of ACI 117
and any of the following requirements that are applicable.
1.6.1
Formed Concrete Surfaces
For High Velocity flow, Class A-HV-Abrupt variation, a positive offset
between concrete surfaces is a raise of elevation in the direction of water
flow and a negative offset is a drop of elevation in the direction of the
water flow.
Direction of water flow
+0 mm 0 inches
-3 mm 1/8 inch
Perpendicular to the
3 mm 1/8 inch
SECTION 03301A
Page 19
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