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What's a Type I/II cement?
Portland cements that meet Type II
requirements also must meet all of the
requirements of Type I cements, except
those for compressive strength. Type I/II
cements meet both the C3A requirements
of Type II cement and the compressive
strength requirements of Type I cements.
Type Keywords Here
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Cement BasicsConcrete Technology Home > Cement Basics >
Cement types
Types of Cement
Types of Portland CementPortland cements are hydraulic cements
composed primarily of hydraulic calcium
silicates. ASTM C150, Standard Specification for Portland
Cement, recognizes ten
types of portland cement:
Type I and Type IA*
General purpose cements suitable for all uses where
the special properties of other types are not required.
Type II and Type IIA*Type II cements contain no more than 8%
tricalcium
aluminate (C3A) for moderate sulfate resistance.
Type II(MH) and Type II(MH)A*
Type II(MH) cements have both a moderate heat of hydration
characteristic, based
on a requirement that the sum of C3S+4.75 C
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Types of Blended CementsBlended hydraulic cements are produced
by intimately and uniformly intergrinding or
blending two or more types of fine materials. The primary
materials are portland
cement, slag cements, fly ash, silica fume, calcined clay, other
pozzolans, hydrated
lime, and pre-blended combinations of these materials.
ASTM C595, Specification for Blended Hydraulic Cements,
recognizes three classes of
blended cement:
Type IS (X) -Portland blast furnace slag cement
Type IP (X) -Portland-pozzolan cement
Type IT(AX)(BY) Ternary blended cement
The letters X and Y stands for the percentage of supplementary
cementitious
material (SCM) included in the blended cement, and A and B are
the Types of SCMs,
either S for slag or P for pozzolan. Type IS(X), can include up
to 95% slag cement.
Type IP(X) can include up to 40% pozzolans. As an example for
ternary cements,Type IT(S25)(P15) contains 25% slag and 15%
pozzolans.
Types of Hydraulic CementAll portland and blended cements are
hydraulic cements. Hydraulic cement is merely
a broader term. ASTM C1157, Performance Specification for
Hydraulic Cements, is a
performance specification that includes portland cement,
modified portland cement,
and blended cements. ASTM C1157 recognizes six types of
hydraulic cements:
Type GU-general use
Type HE-high early strength
Type MS-moderate sulfate resistanceType HS-high sulfate
resistance
Type MH-moderate heat of hydration
Type LH-low heat of hydration
This information was excerpted from PCA's Portland, Blended,
and
Other Hydraulic Cements,a 32-page publication covering
numerous
cement types and their physical properties.
Other resources for information on portland cement production
and technology:
Cement Specification Emphasizes PerformanceASTM C1157, which now
includes both blended and portland cements, moves away from
requirements on chemical composition
Portland Cement Characteristics-2004
Results of a survey of cement manufacturers which compiles data
on cement
characteristics in 2004.
Portland Cement Characteristics-1998
Results of a survey on cement properties in 1998.
Concrete Technology | Cement Types | Portland Cement Association
(PCA) http://www.cement.org/tech/cct_cement_types.asp
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