ASTM C780-23
(Test Method)Standard Test Methods for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
Standard Test Methods for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
SIGNIFICANCE AND USE
5.1 During preconstruction and construction evaluations, use of these test methods establishes specific and overall performance characteristics for the mortar system.
5.2 Preconstruction testing of mortars prebatched by weight provides information for the selection of the individual mortar system best suited for the masonry to be constructed. The recommended tests and their significance are as follows:
5.2.1 Consistency determinations by cone penetration (Annex A1) allow gaging the water additions for all mortars included in the preconstruction test series. Even if the mortar consistency as measured at the construction site is at a different penetration value than those measured during the preconstruction tests, the cone preparation test serves to standardize water additions for mortars being considered as alternatives before construction. Additional testing of mortar water content-consistency relationships (Annex A4) will allow relating these two factors to batch-to-batch variations at the construction site.
5.2.2 Consistency retention by cone penetration (Annex A2) using disturbed or undisturbed mortar samples provides a means of establishing the early-age setting and stiffening characteristics of the mortars. Because laboratory testing is conducted under static climatic conditions, consistency retention test results reflect the relative performance of the mortar systems under test. The same general relationships are expected to hold during testing at the construction project, except as they are influenced by jobsite weather conditions.
5.2.3 Mortar water-content determinations (Annex A4) allow measurement of the water content of the mortar mixture. Mortars prebatched using moist masonry sand may be mathematically analyzed for mortar water content; however, this test, when used for preconstruction evaluation, establishes the effectiveness of the test method and serves as the control or base for tests performed at the construction site.
5.2.4 Mortar ...
SCOPE
1.1 These test methods cover procedures for the sampling and testing of mortars for composition and for their plastic and hardened properties, either before or during their actual use in construction.
Note 1: Guide C1586 provides guidance on evaluating mortar and clarifies the purpose of both these test methods and Specification C270.
Note 2: The testing agency performing these test methods should be evaluated in accordance with Practice C1093.
1.2 Preconstruction Evaluation—These test methods permit comparisons of mortars made from different materials under simulated field conditions. They are also used to establish baseline values for comparative evaluation of field mortars.
1.3 Construction Evaluation—Use of these methods in the field provide a means for quality assurance of field-mixed mortar. They include methods for verifying the mortar mix proportions, comparing test results for field mortars to preconstruction testing, and determining batch-to-batch uniformity of the mortar.
1.4 The test results obtained under these test methods are not required to meet the minimum compressive values in accordance with the property specifications in Specification C270.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.6 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific ...
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C780 − 23
Standard Test Methods for
Preconstruction and Construction Evaluation of Mortars for
1
Plain and Reinforced Unit Masonry
This standard is issued under the fixed designation C780; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
INTRODUCTION
These test methods provide standard procedures for sampling and testing mortars for composition
and plastic and hardened properties, either before or during actual construction. The procedures
outlined in the Annexes are considered applicable for evaluating various combinations of portland
cement, lime, and masonry cement for mortars common to plain and reinforced unit masonry
construction.
The test procedures describe methods for the measurement of mortar composition and mortar
properties. No attempt is made to claim or substantiate specific correlations between the measured
properties and mortar performance in the masonry. However, data from these test methods can be
combined with other information to formulate judgments about the quality of the masonry.
Testing using these procedures is limited to the preconstruction evaluation of masonry mortars
within the laboratory, to the evaluation of masonry mortars at the construction site, and in establishing
the degree of quality control exercised during mortar production at the construction site.
1. Scope* 1.4 The test results obtained under these test methods are
not required to meet the minimum compressive values in
1.1 These test methods cover procedures for the sampling
accordance with the property specifications in Specification
and testing of mortars for composition and for their plastic and
C270.
hardened properties, either before or during their actual use in
construction.
1.5 The values stated in inch-pound units are to be regarded
NOTE 1—Guide C1586 provides guidance on evaluating mortar and as standard. The values given in parentheses are mathematical
clarifies the purpose of both these test methods and Specification C270.
conversions to SI units that are provided for information only
NOTE 2—The testing agency performing these test methods should be
and are not considered standard.
evaluated in accordance with Practice C1093.
1.6 The text of this standard references notes and footnotes
1.2 Preconstruction Evaluation—These test methods permit
comparisons of mortars made from different materials under that provide explanatory material. These notes and footnotes
simulated field conditions. They are also used to establish (excluding those in tables and figures) shall not be considered
baseline values for comparative evaluation of field mortars.
as requirements of the standard.
1.3 Construction Evaluation—Use of these methods in the
1.7 This standard does not purport to address all of the
field provide a means for quality assurance of field-mixed
safety concerns, if any, associated with its use. It is the
mortar. They include methods for verifying the mortar mix
responsibility of the user of this standard to establish appro-
proportions, comparing test results for field mortars to precon-
priate safety, health, and environmental practices and deter-
struction testing, and determining batch-to-batch uniformity of
mine the applicability of regulatory limitations prior to use.
the mortar.
For specific hazards statements, see Section 8.
1.8 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1
These test methods are under the jurisdiction of ASTM Committee C12 on
Mortars and Grouts for Unit Masonry and are the direct responsibility of Subcom- ization established in the Decision on Principles for the
mittee C12.02 on Research and Methods of Test.
Development of International Standards, Guides and Recom-
Current edition approved July 1, 2023. Published July 2023. Originally approved
mendations issued by the World Trade Organization Technical
in 1974. Last previous edition approved in 2020 as C780 – 20. DOI: 10.1520/
C0780-23. Barriers to Trade (TBT) Committee.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C780 − 23
2. Referenced Documents 3.2.4 mortar board samples, n—mortar samples that are
obtained from the mort
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C780 − 20 C780 − 23
Standard Test MethodMethods for
Preconstruction and Construction Evaluation of Mortars for
1
Plain and Reinforced Unit Masonry
This standard is issued under the fixed designation C780; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
INTRODUCTION
This test method provides a standard procedureThese test methods provide standard procedures for
sampling and testing mortars for composition and plastic and hardened properties, either before or
during actual construction. The procedures outlined in the Annexes are considered applicable for
evaluating various combinations of portland cement, lime, and masonry cement for mortars common
to plain and reinforced unit masonry construction.
The test procedures describe methods for the measurement of mortar composition and mortar
properties. No attempt is made to claim or substantiate specific correlations between the measured
properties and mortar performance in the masonry. However, data from these test methods can be
combined with other information to formulate judgments about the quality of the masonry.
Testing using these procedures is limited to the preconstruction evaluation of masonry mortars
within the laboratory, to the evaluation of masonry mortars at the construction site, and in establishing
the degree of quality control exercised during mortar production at the construction site.
1. Scope*
1.1 This test method coversThese test methods cover procedures for the sampling and testing of mortars for composition and for
their plastic and hardened properties, either before or during their actual use in construction.
NOTE 1—Guide C1586 provides guidance on evaluating mortar and clarifies the purpose of both this test methodthese test methods and Specification
C270.
NOTE 2—The testing agency performing this test methodthese test methods should be evaluated in accordance with Practice C1093.
1.2 Preconstruction Evaluation—This test method permitsThese test methods permit comparisons of mortars made from different
materials under simulated field conditions. It isThey are also used to establish baseline values for comparative evaluation of field
mortars.
1.3 Construction Evaluation—Use of this methodthese methods in the field providesprovide a means for quality assurance of
field-mixed mortar. It includesThey include methods for verifying the mortar mix proportions, comparing test results for field
mortars to preconstruction testing, and determining batch-to-batch uniformity of the mortar.
1
This test method isThese test methods are under the jurisdiction of ASTM Committee C12 on Mortars and Grouts for Unit Masonry and isare the direct responsibility
of Subcommittee C12.02 on Research and Methods of Test.
Current edition approved June 15, 2020July 1, 2023. Published July 2020July 2023. Originally approved in 1974. Last previous edition approved in 20192020 as
C780 – 19.C780 – 20. DOI: 10.1520/C0780-20.10.1520/C0780-23.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C780 − 23
1.4 The test results obtained under this test methodthese test methods are not required to meet the minimum compressive values
in accordance with the property specifications in Specification C270.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.6 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. For specific hazards statements, see Section 8.
1.8 This international standard was developed in a
...
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