]2.3.2.3
Required Average Strength of Mix Design
The selected mixture shall produce an average compressive strength
exceeding the specified strength by the amount indicated in ACI 301. When
a concrete production facility has a record of at least 15 consecutive
tests, the standard deviation shall be calculated and the required average
compressive strength shall be determined in accordance with ACI 301. When
a concrete production facility does not have a suitable record of tests to
establish a standard deviation, the required average strength shall be as
follows:
a.
For f'c less than 20 MPa (3000 psi) 3000 psi, 7 MPa (1000 psi)
1000 psi plus f'c.
b.
For f'c between 20 and 35 MPa (3000 and 5000 psi) 3000 and 5000 psi,
8 MPa (1200 psi) 1200 psi plus f'c.
c.
For f'c over 35 MPa (5000 psi) 5000 psi, 10 MPa (1400 psi) 1400 psi
plus f'c.
2.4
MATERIALS
2.4.1
Cement
**************************************************************************
NOTE: Acceptable types of cement are as follows:
ASTM C 150
ASTM C 59/C 59M5M
Portland
Blended
Type I
Type IP or IS
For general use in construction.
Type II
Type IP(MS) or
For general use in construction
Type IS(MS)
where concrete is exposed to
moderate sulfate action or where
moderate heat of hydration is
required. ASTM C 59/C 59M5M
(blended hydraulic cements):
add the suffix MS or MH where
either moderate sulfate
resistance or moderate heat of
hydration, respectively, is
required. Type IP is
portland-pozzolan blended cement
and Type IS is portland-blast
furnace slag cement.
Type IP(MH) or
For general use in construction where
Type IS(MH)
Concrete is exposed to moderate heat
of hydration.
Type III
None
For use when high early strength
is required.
Type V
None
For use when high sulfate
resistance is required.
SECTION 03300N
Page 22
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