ASTM C1142-95(2001)
(Specification)Standard Specification for Extended Life Mortar for Unit Masonry
Standard Specification for Extended Life Mortar for Unit Masonry
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C 1142 – 95 (Reapproved 2001)
Standard Specification for
Extended Life Mortar for Unit Masonry
This standard is issued under the fixed designation C 1142; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 44, Specifications, Tolerances, and Other Technical Re-
quirements for Commercial Weighing and Measuring
1.1 This specification covers extended life mortar as deliv-
Devices
eredforuseinconstructionofnon-reinforcedorreinforcedunit
masonry.
3. Terminology
1.2 This specification is a property standard.
3.1 Definitions of Terms Specific to This Standard:
1.3 Four types of mortar are covered: RM, RS, RN, and RO.
3.1.1 All terms in this specification have their conventional
These types of mortar can be manufactured by using one of the
meaning, except as follows:
four mortar formulations with masonry aggregate: portland
3.1.2 extended life mortars—mortar consisting of cementi-
cement, portland cement-lime, masonry cement, or masonry
tious materials, aggregate, water and set-control admixtures
cement with portland cements. The materials are listed in
which are measured and mixed at a central location, using
Section 5.
weight-or-volume-control equipment.This mortar, as delivered
1.4 Appendix X1 provides a rationale statement and com-
to a construction site, shall be usable for a period in excess of
mentary.
2 ⁄2 h.
2. Referenced Documents
4. Ordering Information
2.1 ASTM Standards:
4.1 The purchaser shall specify the following:
C 91 Specification for Masonry Cement
3 4.1.1 The mortar type in Table 1,
C 144 Specification for Aggregate for Masonry Mortar
4.1.2 Length of workability time for the mortar, and
C 150 Specification for Portland Cement
4.1.3 Desired consistency satisfactory for the mason’s use
C 207 Specification for Hydrated Lime for Masonry Pur-
when tested by the manufacturer in accordance with 10.2.
poses
3 4.2 At the request of the purchaser, the producer shall, prior
C 270 Specification for Mortar for Unit Masonry
to delivery, furnish laboratory and field performance data
C 780 Test Method for Preconstruction and Construction
satisfactory to the purchaser that the materials to be used will
Evaluation of Mortars for Plain and Reinforced Unit
3 produce mortar of the type specified.
Masonry
C 1072 Test Method 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
performance requirements in Section 7. Examples of such tests are: Test
E 447 Test Methods for Compressive Strength of Masonry
Method C 1072, Test Methods E 518, Test Methods E 447, and test data
Prisms
for mortar that has been retempered.
E 518 Test Methods for Flexural Bond Strength of Ma-
sonry
5. Materials
2.2 Other Document:
5.1 Materials used as ingredients in extended life mortar
National Institute of Standards and Technology, Handbook
shall conform to the requirements specified in 5.1.1 through
5.1.4.2.
5.1.1 Cementitious Materials—Cementitiousmaterialsshall
This specification is under the jurisdiction of ASTM Committee C12 on
Mortars and Grouts for Unit Masonry and is the direct responsibility of Subcom- conform to the following ASTM specifications.
mittee C12.03 on Specifications for Mortars.
Current edition approved July 15, 1995. Published September 1995. Originally
published as C 1142 – 90. Last previous edition C 1142 – 94.
2 4
Annual Book of ASTM Standards, Vol 04.01. Available from Superintendent of Documents, U.S. Government Printing
Annual Book of ASTM Standards, Vol 04.05. Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 1142
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
segregation of ingredients.
Mortar Type Retention Content,
at 28 days,
min, % max, %
6.4.2 Temperature of the mortar at time of delivery shall be
min psi, (MPa)
40 to 120°F (4 to 49°C).
Cubes
RM 2500 (17.2) 75 18
RS 1800 (12.4) 75 18
7. Property Requirements
RN 750 (5.2) 75 18
7.1 When sampled and tested in accordance with Sections 9
RO 350 (2.4) 75 18
A
and 10 respectively, the mortar shall comply with the appro-
Twenty-eight days old from date of casting. Refer to 10.3.1. The strength
values as shown are the standard values. Intermediate values may be specified in
priate sections of Table 1.
accordance with project requirements.
7.2 Atest for compressive strength is the average of at least
B
When structural reinforcement is incorporated in mortar, the maximum air
three specimens from one batch.
content shall be 12 %, or bond strength test data shall be provided to justify higher
air content.
7.3 Mortar of known higher strength shall not be indiscrimi-
nately substituted when a mortar type of anticipated lower
5.1.1.1 Portland Cement—Types I, II or III of Specification strength is specified.
C 150. 7.4 Do not change the established proportions for extended
5.1.1.2 Masonry Cement—Types M, S, or N of Specifica- life mortar designed for a particular job, nor utilize materials
tion C 91. with different physical characteristics in the mix unless com-
5.1.1.3 Hydrated Lime—Specification C 207, Type S. pliance with the requirements of this specification are reestab-
lished.
NOTE 2—Type N limes may be permitted if shown by test or perfor-
7.4.1 Alter the dosage of the admixture which controls the
mance record to be not detrimental by the autoclave expansion.
setting time when needed to maintain a similar time of set
5.1.2 Aggregates—The aggregate shall comply with Speci-
during seasonal temperature changes.
fication C 144.
NOTE 3—Consistency of the mortar should be correlated with the
5.1.3 Water—Water shall be clean and free of oils, acids,
particular masonry unit to be used because certain mortars are more
alkalies, salts, organic materials or other substances that may
compatible with certain masonry units. The specifier should consult the
be deleterious to mortar or corrosive to metals in the masonry.
admixture manufacturer to evaluate the interaction of the mortar type and
5.1.4 Admixtures—Admixtures are permitted for use only at
masonry unit specified. Masonry units having a high initial rate of
the production plant.
absorption will have greater compatibility with mortar of high-water
5.1.4.1 Evidence satisfactory to the purchaser shall be
retentivity. Refer to the Related Items That Have an Effect on Properties
provided to show that the admixtures do not cause nor section in Appendix X1 of Specification C 270.
accelerate corrosion of metal which will be in contact with
8. Field Practice
mortar.
8.1 Tempering Mortars—Mortars that have stiffened due to
5.1.4.2 Any admixture to be used shall be subject to written
certification from the manufacturer, supported by evidence that loss of water by evaporation shall be re-tempered not more
than one time during the working life of the mortar by adding
the admixture will have no adverse effect on the long-term
strength, durability, or appearance of the mortar nor on any water to restore the required consistency.
8.1.1 Do not use mortar beyond the period of time estab-
material or component in contact with the mortar, nor any
lished by the manufacturer. This time period shall be docu-
assemblage of which the mortar forms a part.
mented with test data.
6. Manufacture and Delivery
NOTE 4—Extendedlifemortarisusuallydesignedtohaveaworkability
6.1 Storage of Materials—Cementitious materials and ag-
period between 24 to 36 h.
gregates shall be stored in such a manner as to prevent
8.2 Storage at the Site—The mortar shall be protected from
deterioration and contamination.
freezing and evaporation.
6.2 Measurement of Materials—Measure materials in ac-
cordance with 6.2.1 through 6.2.4.
9. Sampling
6.2.1 Cementitious materials and the aggregate shall be
measured by weight or by volume. Volumetric measurement 9.1 Sampling Materials—The mortar materials for labora-
shall be calibrated by weight. tory tests shall be sampled at the plant where the mortar is
6.2.2 Scales for batching mortar ingredients shall conform manufactured. Water, aggregate and cementitious material
to the applicable sections of the current edition of the National shall be sampled in accordance with Test Method C 780.
Institute of Standards and Technology, Handbook 44. 9.2 Sampling Plastic Mortar at the Plant—Discharge from
6.2.3 Measure water by weight or by volume. the mixer a thoroughly mixed sample of mortar not less than 4
6.2.4 Measure admixtures by weight or by volume. gal (15 L) into a nonabsorptive container, from which the
6.3 Mixing—Mix extended life mortar ingredients at a quantity of mortar required for a specific quality control test
central location using either truck mixers or stationary mixers. can be taken.
6.3.1 Agitation, not mixing, is allowed during transport. 9.3 Sampling Plastic Mortar at the Site—Obtain a compos-
6.4 Delivery—Unless otherwise specified, a delivery of the ite sample by combining at least three equal portions from
mortar shall conform to 6.4.1 and 6.4.2. separate mortar containers, producing a quantity not less than
C 1142
4 gal (15 L) in a nonabsorptive container, from which the 10.5.2 Drop the flow table 15 times in 9 s both before and
quantity of mortar required for a specific test can be taken. after suction.
9.4 Record sampling procedures to include the date, time, 10.6 Records—Upon completion of the testing, furnish to
place, method of sampling, and weather conditions. the purchaser complete records of sampling and test results.
10.6.1 Report s
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