ASTM C1142-95(2007)
(Specification)Standard Specification for Extended Life Mortar for Unit Masonry
Standard Specification for Extended Life Mortar for Unit Masonry
ABSTRACT
This specification covers extended life mortar of types RM, RS, RN, and RO, for use in construction of non-reinforced or reinforced unit masonry. Materials used as ingredients in extended life mortar shall be of the following: Portland cement, masonry cement, hydrated lime, aggregates, water, and admixtures. Water shall be clean and free of oils, acids, alkalines, salts, organic materials or other substances that may be deleterious to mortar or corrosive to metals in the masonry. Mortar shall conform to average compressive strength, water retention, and air content indicated in this specification. Specimen for laboratory testing shall have attained final set. Moreover, moist storage and curing condition of specimen shall conform to the specification. For testing, the cone penetration method shall be utilized to determine the consistency of the mortar. The air content of the mortar shall be determined by either the pressure method or the volumetric method.
SCOPE
1.1 This specification covers extended life mortar as delivered for use in construction of non-reinforced or reinforced unit masonry.
1.2 This specification is a property standard.
1.3 Four types of mortar are covered: RM, RS, RN, and RO. These types of mortar can be manufactured by using one of the four mortar formulations with masonry aggregate: portland cement, portland cement-lime, masonry cement, or masonry cement with portland cements. The materials are listed in Section 5.
1.4 Appendix X1 provides a rationale statement and commentary.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C1142 −95(Reapproved 2007)
Standard Specification for
Extended Life Mortar for Unit Masonry
This standard is issued under the fixed designation C1142; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Other Document:
National Institute of Standards and Technology, Handbook
1.1 This specification covers extended life mortar as deliv-
44, Specifications, Tolerances, and Other Technical Re-
eredforuseinconstructionofnon-reinforcedorreinforcedunit
quirements for Commercial Weighing and Measuring
masonry.
Devices
1.2 This specification is a property standard.
3. Terminology
1.3 Fourtypesofmortararecovered:RM,RS,RN,andRO.
3.1 Definitions of Terms Specific to This Standard:
These types of mortar can be manufactured by using one of the
3.1.1 All terms in this specification have their conventional
four mortar formulations with masonry aggregate: portland
meaning, except as follows:
cement, portland cement-lime, masonry cement, or masonry
3.1.2 extended life mortars—mortar consisting of cementi-
cement with portland cements. The materials are listed in
tious materials, aggregate, water and set-control admixtures
Section 5.
which are measured and mixed at a central location, using
1.4 Appendix X1 provides a rationale statement and com-
weight-or-volume-controlequipment.Thismortar,asdelivered
mentary.
to a construction site, shall be usable for a period in excess of
2 ⁄2 h.
2. Referenced Documents
4. Ordering Information
2.1 ASTM Standards:
4.1 The purchaser shall specify the following:
C91 Specification for Masonry Cement
4.1.1 The mortar type in Table 1,
C144 Specification for Aggregate for Masonry Mortar
4.1.2 Length of workability time for the mortar, and
C150 Specification for Portland Cement
4.1.3 Desired consistency satisfactory for the mason’s use
C207 Specification for Hydrated Lime for Masonry Pur-
when tested by the manufacturer in accordance with 10.2.
poses
C270 Specification for Mortar for Unit Masonry
4.2 At the request of the purchaser, the producer shall, prior
C780 Test Method for Preconstruction and Construction
to delivery, furnish laboratory and field performance data
Evaluation of Mortars for Plain and Reinforced Unit
satisfactory to the purchaser that the materials to be used will
Masonry
produce mortar of the type specified.
C1072 Test Methods for Measurement of Masonry Flexural
NOTE 1—The purchase order or contract may list the mortar ingredients
Bond Strength
desired and may state a list of optional data, which are in addition to the
E447 Test Method for Compressive Strength of Laboratory
performance requirements in Section 7. Examples of such tests are: Test
Constructed Masonry Prisms (Withdrawn 1997) Method C1072, Test Methods E518, Test Methods E447, and test data for
mortar that has been retempered.
E518 Test Methods for Flexural Bond Strength of Masonry
5. Materials
5.1 Materials used as ingredients in extended life mortar
This specification is under the jurisdiction of ASTM Committee C12 on
shall conform to the requirements specified in 5.1.1 through
Mortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-
5.1.4.2.
mittee C12.03 on Specifications for Mortars.
CurrenteditionapprovedJune1,2007.PublishedJuly2007.Originallyapproved
5.1.1 Cementitious Materials—Cementitious materials shall
in 1990. Last previous edition approved in 2001 as C1142 – 95 (2001). DOI:
conform to the following ASTM specifications.
10.1520/C1142-95R07.
5.1.1.1 Portland Cement—Types I, II or III of Specification
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM C150.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 4
The last approved version of this historical standard is referenced on Available from Superintendent of Documents, U.S. Government Printing
www.astm.org. Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1142−95 (2007)
TABLE 1 Property Specification Requirements
6.4.1 Thoroughly mix and deliver to the construction site
A
Avg Compressive mortar with a satisfactory degree of workability and without
Water
Air
Strength
B
Mortar Type Retention
Content, segregation of ingredients.
at 28 days,
max, %
min, %
min psi, (MPa)
6.4.2 Temperature of the mortar at time of delivery shall be
Cubes
40 to 120°F (4 to 49°C).
RM 2500 (17.2) 75 18
RS 1800 (12.4) 75 18
7. Property Requirements
RN 750 (5.2) 75 18
RO 350 (2.4) 75 18
7.1 When sampled and tested in accordance with Sections 9
A
Twenty-eight days old from date of casting. Refer to 10.3.1. The strength values
and 10 respectively, the mortar shall comply with the appro-
as shown are the standard values. Intermediate values may be specified in
priate sections of Table 1.
accordance with project requirements.
B
When structural reinforcement is incorporated in mortar, the maximum air
7.2 Atest for compressive strength is the average of at least
content shall be 12 %, or bond strength test data shall be provided to justify higher
three specimens from one batch.
air content.
7.3 Mortar of known higher strength shall not be indiscrimi-
nately substituted when a mortar type of anticipated lower
strength is specified.
5.1.1.2 Masonry Cement—TypesM,S,orNofSpecification
C91.
7.4 Do not change the established proportions for extended
5.1.1.3 Hydrated Lime—Specification C207, Type S.
life mortar designed for a particular job, nor utilize materials
with different physical characteristics in the mix unless com-
NOTE 2—Type N limes may be permitted if shown by test or
pliance with the requirements of this specification are reestab-
performance record to be not detrimental by the autoclave expansion.
lished.
5.1.2 Aggregates—The aggregate shall comply with Speci-
7.4.1 Alter the dosage of the admixture which controls the
fication C144.
setting time when needed to maintain a similar time of set
5.1.3 Water—Water shall be clean and free of oils, acids,
during seasonal temperature changes.
alkalies, salts, organic materials or other substances that may
be deleterious to mortar or corrosive to metals in the masonry. NOTE 3—Consistency of the mortar should be correlated with the
particular masonry unit to be used because certain mortars are more
5.1.4 Admixtures—Admixtures are permitted for use only at
compatible with certain masonry units. The specifier should consult the
the production plant.
admixture manufacturer to evaluate the interaction of the mortar type and
5.1.4.1 Evidence satisfactory to the purchaser shall be
masonry unit specified. Masonry units having a high initial rate of
provided to show that the admixtures do not cause nor
absorption will have greater compatibility with mortar of high-water
retentivity. Refer to the Related Items That Have an Effect on Properties
accelerate corrosion of metal which will be in contact with
section in Appendix X1 of Specification C270.
mortar.
5.1.4.2 Any admixture to be used shall be subject to written
8. Field Practice
certification from the manufacturer, supported by evidence that
8.1 Tempering Mortars—Mortars that have stiffened due to
the admixture will have no adverse effect on the long-term
loss of water by evaporation shall be re-tempered not more
strength, durability, or appearance of the mortar nor on any
than one time during the working life of the mortar by adding
material or component in contact with the mortar, nor any
water to restore the required consistency.
assemblage of which the mortar forms a part.
8.1.1 Do not use mortar beyond the period of time estab-
6. Manufacture and Delivery lished by the manufacturer. This time period shall be docu-
mented with test data.
6.1 Storage of Materials—Cementitious materials and ag-
gregates shall be stored in such a manner as to prevent
NOTE 4—Extended life mortar is usually designed to have a workability
period between 24 to 36 h.
deterioration and contamination.
8.2 Storage at the Site—The mortar shall be protected from
6.2 Measurement of Materials—Measurematerialsinaccor-
freezing and evaporation.
dance with 6.2.1 through 6.2.4.
6.2.1 Cementitious materials and the aggregate shall be
9. Sampling
measured by weight or by volume. Volumetric measurement
shall be calibrated by weight. 9.1 Sampling Materials—The mortar materials for labora-
6.2.2 Scales for batching mortar ingredients shall conform tory tests shall be sampled at the plant where the mortar is
to the applicable sections of the current edition of the National manufactured. Water, aggregate and cementitious material
Institute of Standards and Technology, Handbook 44. shall be sampled in accordance with Test Method C780.
6.2.3 Measure water by weight or by volume.
9.2 Sampling Plastic Mortar at the Plant—Discharge from
6.2.4 Measure admixtures by weight or by volume.
the mixer a thoroughly mixed sample of mortar not less than 4
6.3 Mixing—Mix extended life mortar ingredients at a gal (15 L) into a nonabsorptive container, from which the
central location using either truck mixers or stationary mixers. quantity of mortar required for a specific quality control test
6.3.1 Agitation, not mixing, is allowed during transport. can be taken.
6.4 Delivery—Unless otherwise specified, a delivery of the 9.3 Sampling Plastic Mortar at the Site—Obtain a compos-
mortar shall conform to 6.4.1 and 6.4.2. ite sample by combining at least three equal portions from
C1142−95 (2007)
separate mortar containers, producing a quantity not less than 10.5.2 Drop the flow table 15 times in 9 s both before and
4 gal (15 L) in a nonabsorptive container, from which the after suction.
quantity of mortar required for a specific test can be taken.
10.6 Records—Upon completion of the testing, furnish to
9.4 Record sampling procedures to include the date, time, the purchaser complete records of sampling and test results.
place, method of sampling, and weather
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