ASTM C1860-21
(Test Method)Standard Test Methods for Measurement of Tensile Strength or Bond Strength of Portland Cement-Based Plaster by Direct Tension
Standard Test Methods for Measurement of Tensile Strength or Bond Strength of Portland Cement-Based Plaster by Direct Tension
SIGNIFICANCE AND USE
4.1 The purpose of the test methods in this standard is to measure the tensile strength or bond strength of portland cement-based plaster to its substrate. The values obtained using the test methods are not purported to be representative of the actual wind load capacity or other structural properties of a specific portland cement-based plaster installation but may be helpful in assessing such load capacities.
4.2 Because the test methods described in this standard are used for evaluation of portland cement-based plaster cured at least 28 days, load results obtained by either test method must be interpreted based on sound engineering practice, applicable building regulations, and codes having jurisdiction. The decision of whether to use the load results directly or to use the load results as modified by an appropriate safety factor to obtain acceptable working loads is left to the discretion of the test specifier. Determination of an appropriate safety factor shall be left to the discretion of the test specifier. Methods to calculate a safety factor and a maximum permitted working load are provided in the Appendix.
4.3 When the test methods contained in this standard are used on test specimens installed on existing structures, the test results shall not be generalized to a larger wall area without sufficient test sampling. Such efforts should be based on engineering experience and judgment of the test specifier.
SCOPE
1.1 These test methods cover procedures for determining the tensile strength of a section of portland cement-based plaster, the bond strength between portland cement-based plaster and a solid plaster base, or the fastener pull-out or lath pull-over strength for portland cement-based plaster bases over framing in either an exterior (stucco) or interior application. The test procedures are destructive in nature within the localized test areas and, after testing is concluded, require appropriate repair of the finish system as well as any underlying materials damaged during testing.
1.2 These test methods are suitable for use on portland cement-based plaster finish systems on both new and existing construction. Test methods shall be conducted a minimum of 28 days after application of the portland cement-based plaster. Mechanical Load Test Method A and Vacuum Chamber Testing shall be used to determine the tensile strength or bond strength of direct-applied portland cement-based plaster and may be useful in evaluating the efficacy of different surface preparation characteristics, bonding agents, or both. Mechanical Load Test Method B and Vacuum Chamber Testing shall be used to determine the tensile strength of portland cement-based plaster installed over mechanically attached lath.
1.3 These test methods are suitable for use in both laboratory and field samples. No correlation shall be made between laboratory and field testing.
1.4 These test methods are not intended to evaluate the performance of the underlying construction or framing members. Test results on a particular building may be variable depending on the specimen location, condition, and installation, and are subject to interpretation by the test specifier.
1.5 These test methods are not intended to evaluate the performance of coatings applied to the surface of the portland cement-based plaster.
1.6 These test methods are not intended to be a pre-construction qualifier to determine if the surfaces are appropriate for application of portland cement plaster. The test methods are intended to be used as a tool to quantitatively evaluate existing portland cement plaster cladding that is suspected of questionable bond or uncertain fastening to the substrate.
1.7 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.
1.8 This standard may involve h...
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Designation: C1860 − 21
Standard Test Methods for
Measurement of Tensile Strength or Bond Strength of
1
Portland Cement-Based Plaster by Direct Tension
This standard is issued under the fixed designation C1860; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.5 These test methods are not intended to evaluate the
performance of coatings applied to the surface of the portland
1.1 These test methods cover procedures for determining
cement-based plaster.
the tensile strength of a section of portland cement-based
plaster, the bond strength between portland cement-based
1.6 These test methods are not intended to be a pre-
plaster and a solid plaster base, or the fastener pull-out or lath
construction qualifier to determine if the surfaces are appro-
pull-overstrengthforportlandcement-basedplasterbasesover
priate for application of portland cement plaster. The test
framing in either an exterior (stucco) or interior application.
methods are intended to be used as a tool to quantitatively
The test procedures are destructive in nature within the
evaluate existing portland cement plaster cladding that is
localized test areas and, after testing is concluded, require
suspected of questionable bond or uncertain fastening to the
appropriate repair of the finish system as well as any underly-
substrate.
ing materials damaged during testing.
1.7 The values stated in inch-pound units are to be regarded
1.2 These test methods are suitable for use on portland
as standard. The values given in parentheses are mathematical
cement-based plaster finish systems on both new and existing
conversions to SI units that are provided for information only
construction. Test methods shall be conducted a minimum of
and are not considered standard.
28days after application of the portland cement-based plaster.
1.8 This standard may involve hazardous materials,
MechanicalLoadTestMethodAandVacuumChamberTesting
operations, or equipment. This standard does not purport to
shall be used to determine the tensile strength or bond strength
address all of the safety concerns, if any, associated with its
of direct-applied portland cement-based plaster and may be
use. It is the responsibility of the user of this standard to
usefulinevaluatingtheefficacyofdifferentsurfacepreparation
establish appropriate safety, health, and environmental prac-
characteristics, bonding agents, or both. Mechanical Load Test
tices and determine the applicability of regulatory limitations
Method B and Vacuum Chamber Testing shall be used to
prior to use.
determine the tensile strength of portland cement-based plaster
installed over mechanically attached lath.
1.9 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.3 These test methods are suitable for use in both labora-
ization established in the Decision on Principles for the
tory and field samples. No correlation shall be made between
Development of International Standards, Guides and Recom-
laboratory and field testing.
mendations issued by the World Trade Organization Technical
1.4 These test methods are not intended to evaluate the
Barriers to Trade (TBT) Committee.
performance of the underlying construction or framing mem-
bers. Test results on a particular building may be variable
2. Referenced Documents
depending on the specimen location, condition, and
2.1 ASTM Standards:
installation, and are subject to interpretation by the test
C11Terminology Relating to Gypsum and Related Building
specifier.
Materials and Systems
C219Terminology Relating to Hydraulic and Other Inor-
ganic Cements
1
These test methods are under the jurisdiction of ASTM Committee C11 on
D3665Practice for Random Sampling of Construction Ma-
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and terials
Related Products.
E2359/E2359MTest Method for Field Pull Testing of an
CurrenteditionapprovedJune1,2021.PublishedJuly2021.Originallyapproved
In-Place Exterior Insulation and Finish System Clad Wall
in 2018. Last previous edition approved in 2020 as C1860–20. DOI: 10.1520/
C1860-21. Assembly
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1860 − 21
2
2.2 American Society of Civil Engineers Standard: acceptable working loads is left to the discretion of the test
SEI/ASC7MinimumDesignLoadsforBuildingsandOther specifier.Determinationofanappropriatesafetyfactorshall
...
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: C1860 − 20 C1860 − 21
Standard Test Methods for
Measurement of Tensile Strength or Bond Strength of
1
Portland Cement-Based Plaster by Direct Tension
This standard is issued under the fixed designation C1860; 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
1.1 These test methods cover procedures for determining the tensile strength of a section of portland cement-based plaster, the
bond strength between portland cement-based plaster and a solid plaster base, or the fastener pull-out or lath pull-over strength for
portland cement-based plaster bases over framing in either an exterior (stucco) or interior application. The test procedures are
destructive in nature within the localized test areas and, after testing is concluded, require appropriate repair of the finish system
as well as any underlying materials damaged during testing.
1.2 TheThese test methods are suitable for use on portland cement-based plaster finish systems on both new and existing
construction. Test methods shall be conducted a minimum of 28 days after application of the portland cement-based plaster.
Mechanical Load Test Method A and Vacuum Chamber Testing shall be used to determine the tensile strength or bond strength
of direct-applied portland cement-based plaster and may be useful in evaluating the efficacy of different surface preparation
characteristics, bonding agents, or both. Mechanical Load Test Method B and Vacuum Chamber Testing shall be used to determine
the tensile strength of portland cement-based plaster installed over mechanically attached lath.
1.3 TheThese test methods are suitable for use in both laboratory and field samples. No correlation shall be made between
laboratory and field testing.
1.4 TheThese test methods are not intended to evaluate the performance of the underlying construction or framing members. Test
results on a particular building may be variable depending on the specimen location, condition, and installation, and are subject
to interpretation by the test specifier.
1.5 TheThese test methods are not intended to evaluate the performance of coatings applied to the surface of the portland
cement-based plaster.
1.6 TheThese test methods are not intended to be a pre-construction qualifier to determine if the surfaces are appropriate for
application of portland cement plaster. The test methods are intended to be used as a tool to quantitatively evaluate existing
portland cement plaster cladding that is suspected of questionable bond or uncertain fastening to the substrate.
1.7 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
ThisThese test method ismethods are under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct
responsibility of Subcommittee C11.02 on Specifications and Test Methods for Accessories and Related Products.
Current edition approved Nov. 15, 2020June 1, 2021. Published December 2020July 2021. Originally approved in 2018. Last previous edition approved in 20192020 as
C1860 – 19a.C1860 – 20. DOI: 10.1520/C1860-20. 10.1520/C1860-21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1860 − 21
1.8 This standard may involve hazardous materials, operations, or equipment. 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.
1.9 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.
2. Referenced Documents
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C219 Terminology Relating to Hydraulic and Other Inorg
...
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