ASTM C1860-19a
(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 The 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 The test methods are suitable for use in both laboratory and field samples. No correlation shall be made between laboratory and field testing.
1.4 The 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 The test methods are not intended to evaluate the performance of coatings applied to the surface of the portland cement-based plaster.
1.6 The 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 the standard. SI values in parentheses are provided for information only.
1.8 This standard may involve hazardous materials, operations, or equipment. This standard does not purport to address all...
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Designation: C1860 − 19a
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* 1.6 The test methods are not intended to be a pre-
construction qualifier to determine if the surfaces are appro-
1.1 These test methods cover procedures for determining
priate for application of portland cement plaster. The test
the tensile strength of a section of portland cement-based
methods are intended to be used as a tool to quantitatively
plaster, the bond strength between portland cement-based
evaluate existing portland cement plaster cladding that is
plaster and a solid plaster base, or the fastener pull-out or lath
suspected of questionable bond or uncertain fastening to the
pull-overstrengthforportlandcement-basedplasterbasesover
substrate.
framing in either an exterior (stucco) or interior application.
The test procedures are destructive in nature within the 1.7 The values stated in inch-pound units are to be regarded
localized test areas and, after testing is concluded, require as the standard. SI values in parentheses are provided for
appropriate repair of the finish system as well as any underly- information only.
ing materials damaged during testing.
1.8 This standard may involve hazardous materials,
operations, or equipment. This standard does not purport to
1.2 The test methods are suitable for use on portland
address all of the safety concerns, if any, associated with its
cement-based plaster finish systems on both new and existing
use. It is the responsibility of the user of this standard to
construction. Test methods shall be conducted a minimum of
establish appropriate safety, health, and environmental prac-
28days after application of the portland cement-based plaster.
tices and determine the applicability of regulatory limitations
MechanicalLoadTestMethodAandVacuumChamberTesting
prior to use.
shall be used to determine the tensile strength or bond strength
1.9 This international standard was developed in accor-
of direct-applied portland cement-based plaster and may be
dance with internationally recognized principles on standard-
usefulinevaluatingtheefficacyofdifferentsurfacepreparation
ization established in the Decision on Principles for the
characteristics, bonding agents, or both. Mechanical Load Test
Development of International Standards, Guides and Recom-
Method B and Vacuum Chamber Testing shall be used to
mendations issued by the World Trade Organization Technical
determine the tensile strength of portland cement-based plaster
Barriers to Trade (TBT) Committee.
installed over mechanically attached lath.
1.3 The test methods are suitable for use in both laboratory
2. Referenced Documents
and field samples. No correlation shall be made between
2.1 ASTM Standards:
laboratory and field testing.
C11Terminology Relating to Gypsum and Related Building
1.4 The test methods are not intended to evaluate the
Materials and Systems
performance of the underlying construction or framing mem-
C219Terminology Relating to Hydraulic and Other Inor-
bers. Test results on a particular building may be variable
ganic Cements
depending on the specimen location, condition, and
C926Specification for Application of Portland Cement-
installation, and are subject to interpretation by the test
Based Plaster
specifier.
C1063Specification for Installation of Lathing and Furring
1.5 The test methods are not intended to evaluate the
to Receive Interior and Exterior Portland Cement-Based
performance of coatings applied to the surface of the portland
Plaster
cement-based plaster.
C1583/C1583MTest Method for Tensile Strength of Con-
crete Surfaces and the Bond Strength or Tensile Strength
1
of Concrete Repair and Overlay Materials by Direct
ThistestmethodisunderthejurisdictionofASTMCommitteeC11onGypsum
and Related Building Materials and Systems and is the direct responsibility of
Tension (Pull-off Method)
Subcommittee C11.02 on Specifications and Test Methods for Accessories and
D3665Practice for Random Sampling of Construction Ma-
Related Products.
terials
Current edition approved Oct. 1, 2019. Published December 2019. Last previous
edition approved in 2019 as C1860–19. DOI: 10.1520/C1860-19A. E2359/E2359MTest Method for Field Pull Testing of an
*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
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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 − 19 C1860 − 19a
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 The test methods are suitable for use on portland cement-based plaster finish systems on both new and existing construction.
Test methodmethods 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 The test methods are suitable for use in both laboratory and field samples. No correlation shall be made between laboratory
and field testing.
1.4 The 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 The test methods are not intended to evaluate the performance of coatings applied to the surface of the portland
cement-based plaster.
1.6 The 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 the standard. SI values in parentheses are provided for
information only.
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 Inorganic Cements
C926 Specification for Application of Portland Cement-Based Plaster
1
This test method is 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 March 1, 2019Oct. 1, 2019. Published April 2019December 2019. Last previous edition approved in 20182019 as C1860 – 18.C1860 – 19. DOI:
10.1520/C1860-19.10.1520/C1860-19A.
*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
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C1860 −
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