Mortar Brochure U.S.

St Marys Masonry Cement is a hydraulic cement produced specifically for use in mortar
for unit masonry construction.
lntergrinding of portland cement clinker with plasticizers in the production of St Marys Masonry Cement
provides excellent plasticity, water retentivity and air-entrainment. An adequate level of air entrainment
enhances the important hardened property of mortar - durability, which is so important in the freeze-thaw
climate of the Great Lakes region.
St Marys Masonry
Cements meets the
requirements of
ASTM Standard C91
“Standard
Specification for
Masonry Cement.”
It also meets the
requirements of the
following building
codes: ACI 530.95,
IBC 2000, MBC
2000 and MRC
2000.
A
ASTM C270 Table 1. Proportion Specification
Requirements for Masonry Cement Mortars
Type
Masonry
Cement
M S N
Portland
Cement
M
M
S
S
N
O
1
1
1
1/2
1
1
Aggregate Ratio
(Measured in damp, loose, conditions)
Not less than 2 1/4 and not
more than 3 times the sum of
the separate volumes of
cementitious materials.
1
1
Note: Two air-entraining agents shall not be combined in mortar.
B
ASTM C270 Table 2. Property Specification Requirementsa
for Masonry Cement Mortars
Masonry cement mortars may be specified by either
the proportion or property method of ASTM C270
“Standard Specification for Mortar for Unit
Masonry”. Under Table 1 “Proportion Specification
Requirements” (A), Type N mortar is specified as
1 part Type N masonry cement to 2 1/4 to 3 parts
aggregate (sand). Type S and M mortars are
specified the same way.
Alternatively, mortars may be specified by
property requirements as in Table 2 (B), a
laboratory prepared Type N mortar must meet
750 psi in compressive strength to meet the
standard. Similarly Type S must meet 1800 psi
and Type M must meet 2500 psi.
Type
Average
Compressive
Strength
at 28 Days
Min. psi/MPa
M
S
N
O
2500
1800
750
350
/ 17.2
/ 12.4
/ 5.2
/ 2.4
Air
Content
Max. %
75
75
75
75
18
18
20d
20d
Aggregate Ratio
(Measured in
damp, loose, conditions)
Not less than 2 1/4 and not
more than 3 1/2 times the sum
of the separate volumes of
cementitious materials.
a. Laboratory prepared mortar only.
d. When the structural reinforcement is incorporated, the maximum air content
of Masonry Cement Mortar shall be 18%.
ASTM C270 (XI.1). Guide for the Selection of Masonry Mortar
Location
Appendix XI.1 of ASTM C270 provides a nonmandatory guide for the selection of masonry
mortars for various locations and building
segments. Selection of mortar type should also
be based on the type of masonry units to be
used as well as the applicable building code and
engineering practice standard requirements, such
as allowable design stresses and lateral support.
Water
Retention
Min. %
Exterior,
above grade
Exterior,
at or below grade
Interior
Building
Segment
Mortar Type
Recommended
Alternative
load bearing wall
non-load bearing wall
parapet wall
foundation wall, retaining
wall, manholes, sewers
pavements, walks & patios
load bearing wall
non-bearing partitions
N
Ob
N
S
S or M
N or S
S
M or N c
N
O
S or M
N
b. Type O mortar recommended for use where the masonry is unlikely to be frozen
when saturated or unlikely to be subjected to high winds or other significant
lateral loads. Type N or S mortar should be used in other cases.
c. Masonry exposed to weather in a normally horizontal surface is extremely
vulnerable to weathering. Mortar for such masonry should be selected with
due caution.
Note: This table does not provide for many specialized mortar uses, such as chimney
reinforced masonry and acid-resistant mortars.
St Marys Mortar Cement is a higher bond strength and lower air content
cement for use in mortar for unit masonry construction.
Mortar cements were specifically developed to
provide comparable bond and compressive
strengths to portland cement/lime mortars, yet
maintain the excellent workability and durability
of masonry cement mortars. St Marys Mortar
Cements meet all requirements of ASTM
C1329 Table 1 “Standard Specifications for
Mortar Cement” (C) and may be used in all
seismic zones. Thus, St Marys Mortar Cements
can be specified for use in all masonry
construction projects.
C
ASTM C1329 Table 1.
Physical Requirements of Mortar Cement
Type
N
Type
S
Type
M
Flexural Bond Strength at 28 days, min. psi
70
100
115
Air Content of Mortar ( Laboratory prepared)
Min. % by volume
Max. % by volume
8
17
8
15
8
15
Test Data of St Marys Mortar Cements relating to ASTM C1329 Table 1.
Air Content
Type Max.% Actual
Laboratory
St Marys Mortar Cements meet the
requirements of the following building codes:
IBC 2000; MBC 2000 and UBC 21-14.
Air content and bond requirements outlined
in ASTM C1329 must also be met. To evaluate
our mortar cements for compliance, St Marys
Cement commissioned a number of
independent laboratories whose test results
are summarized in the table at right.
St Marys Cement
W. R. Grace
Construction Technology
(Skokie, IL) Mortar
St Marys Cement
W. R. Grace
R. L. Nelson & Ass.
(Schaumburg, IL)
Bond Strength
Min. Required Actual
(psi)
(psi)
N
N
N
17
17
17
12.7
14.8
13.1
70
70
70
133
139
107
S
S
S
15
15
15
11.2
14.0
11.0
100
100
100
131
175
142
ASTM C270 Table 1. Proportion Specifications
for Mortar Cement Mortars
Type
M
M
S
S
N
O
Portland
Cement
Mortar
Cement
M
S
N
1
Aggregate Ratio
(Measured in damp,
loose, conditions)
1
Not less than 2 1/4 and not
more than 3 times the sum of
the separate volumes of
cementitious materials.
1
1/2
D
1
1
1
1
Mortar Cement conforming to the requirements of ASTM C1329.
Note: Two air entraining agents shall not be combined in mortar.
ASTM C270 Table 2, Property Specification Requirementsa
for Mortar Cement Mortars
Mortar cement mortars may be specified by either
the proportion or property method of ASTM C270.
Under Table 1. (D), Type N mortar is specified as
1 part Type N mortar cement to 2 1/4 to 3 parts
aggregate (sand). Type S is specified the same way.
Alternatively, mortars may be specified by
property as in ASTM C270 Table 2 (E). To meet
the standard, a Type N laboratory prepared mortar
must meet 750 psi in compressive strength,
similarly Type S mortar must meet 1800 psi.
Type
M
S
N
O
Average
Compressive
Strength
at 28 Days
Min. psi/MPa
2500
1800
750
350
/ 17.2
/ 12.4
/ 5.2
/ 2.4
Water
Retention
Min. %
Air
Content
Max. %
75
75
75
75
12
12
14c
14c
E
Aggregate Ratio
(Measured in
damp, loose, conditions)
Not less than 2 1/4 and not
more than 3 1/2 times the
sum of the separate volumes
of cementitious materials.
a. Laboratory prepared mortar only.
c. When the structural reinforcement is incorporated, the maximum air content
of Masonry Cement Mortar shall be 12%.