ASTM C 150
ASTM C 59/C 59M5
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 59M5
(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.
Modify paragraph and specify either 50 percent Type
II, IP(MS) or IS(MS) cement with 50 percent ground
iron blast-furnace slag, 75 percent Type II, IP(MS)
or IS(MS) cement with 25 percent Class F fly ash, or
Type V cement when structure is within a saltwater
spray range of 7500 mm (25 feet) 25 feet height or
within a horizontal distance of 3000 mm (10 feet) 10
feet. Require cement to meet chemical requirements
of ASTM C 150, Table 1A when using alkali-reactive
aggregates.
The customary requirements for a low tricalcium
aluminate content for concrete in seawater reduces
sulfate attack but can lead to increased chloride
ion penetration thereby leading to rebar rusting.
There are various ways to approach the problem:
1. Use a Type III or other cement with a 6 - 8
percent tricalcium aluminate content and take the
chance of sulfate attack;
2. Use a cement with a low to moderate tricalcium
aluminate content plus fly ash for sulfate attack,
and calcium nitrite for anti-rust protection;
3. Use a low tricalcium aluminate cement plus
microsilica plus calcium nitrite.
SECTION 03300N
Page 23
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