ASTM C1860-20
(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 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 hazardous m...
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Designation: C1860 − 20
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 standard. The values given in parentheses are mathematical
appropriate repair of the finish system as well as any underly- conversions to SI units that are provided for information only
ing materials damaged during testing. and are not considered standard.
1.8 This standard may involve hazardous materials,
1.2 The test methods are suitable for use on portland
operations, or equipment. This standard does not purport to
cement-based plaster finish systems on both new and existing
address all of the safety concerns, if any, associated with its
construction. Test methods shall be conducted a minimum of
use. It is the responsibility of the user of this standard to
28days after application of the portland cement-based plaster.
establish appropriate safety, health, and environmental prac-
MechanicalLoadTestMethodAandVacuumChamberTesting
tices and determine the applicability of regulatory limitations
shall be used to determine the tensile strength or bond strength
prior to use.
of direct-applied portland cement-based plaster and may be
1.9 This international standard was developed in accor-
usefulinevaluatingtheefficacyofdifferentsurfacepreparation
dance with internationally recognized principles on standard-
characteristics, bonding agents, or both. Mechanical Load Test
ization established in the Decision on Principles for the
Method B and Vacuum Chamber Testing shall be used to
Development of International Standards, Guides and Recom-
determine the tensile strength of portland cement-based plaster
mendations issued by the World Trade Organization Technical
installed over mechanically attached lath.
Barriers to Trade (TBT) Committee.
1.3 The test methods are suitable for use in both laboratory
and field samples. No correlation shall be made between
2. Referenced Documents
laboratory and field testing.
2.1 ASTM Standards:
1.4 The test methods are not intended to evaluate the
C11Terminology Relating to Gypsum and Related Building
performance of the underlying construction or framing mem-
Materials and Systems
bers. Test results on a particular building may be variable
C219Terminology Relating to Hydraulic and Other Inor-
depending on the specimen location, condition, and
ganic Cements
installation, and are subject to interpretation by the test
D3665Practice for Random Sampling of Construction Ma-
specifier.
terials
E2359/E2359MTest Method for Field Pull Testing of an
1.5 The test methods are not intended to evaluate the
In-Place Exterior Insulation and Finish System Clad Wall
performance of coatings applied to the surface of the portland
Assembly
cement-based plaster.
2
2.2 American Society of Civil Engineers Standard:
SEI/ASC7MinimumDesignLoadsforBuildingsandOther
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC11onGypsum
Structures
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.
2
Current edition approved Nov. 15, 2020. Published December 2020. Last Available fromAmerican Society of Civil Engineers (ASCE), 1801Alexander
previous edition approved in 2019 as C1860–19a. DOI: 10.1520/C1860-20. Bell Dr., Reston, VA 20191, http://www.asce.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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C1860 − 20
3
2.3 U.S. De
...
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 − 19a C1860 − 20
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*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. SIThe values given in parentheses are mathematical
conversions to SI units that are provided for information only.only and are not considered standard.
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 Oct. 1, 2019Nov. 15, 2020. Published December 2019December 2020. Last previous edition approved in 2019 as C1860 – 19.C1860 – 19a. DOI:
10.1520/C1860-19A.10.1520/C1860-20.
*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 ----------------------
C1860 − 20
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 a
...
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