ASTM C 150
ASTM C 59/C 59M5M 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
Type
II (LA)
moderate sulfate or alkali action or
Type
II (LH)
where moderate heat of hydration is
required. ASTM C 59/C 59M5 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 III
None
For use when high early strength
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.
Require cement to meet chemical requirements of ASTM
C 150, Table 2 for equivalent alkalies 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 to 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 moderate tricalcium aluminate cement plus
silica fume plus calcium nitrite.
Designer shall make a decision as to what risks are
to be taken and what admixtures are to be used. The
Notes should give some guidance so that a cost
effective decision can be made.
**************************************************************************
ASTM C 150, Type I or II and/or ASTM C 59/C 59M5M ASTM C 59/C 59M5, Type
IP(MS) or IS(MS) and ASTM C 1157, Type MS blended cement except as modified
herein. The tricalcium aluminate (C3A) content shall not be less than 4
percent to provide protection for the reinforcement and shall not be more
than 10 percent to obtain concrete that is resistant to sulfate attack.
Blended cements shall consist of a mixture of ASTM C 150 cement and one of
SECTION 03311
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