ASTM C1860-18
(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 method shall be conducted a minimum of 28 days after application of the portland cement-based plaster. Test Method A 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. Test Method B 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 t...
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Designation: C1860 − 18
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,
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 method 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-
TestMethodAshallbeusedtodeterminethetensilestrengthor
tices and determine the applicability of regulatory limitations
bond strength of direct-applied portland cement-based plaster
prior to use.
andmaybeusefulinevaluatingtheefficacyofdifferentsurface
preparation characteristics, bonding agents, or both. Test 1.9 This international standard was developed in accor-
Method B shall be used to determine the tensile strength of
dance with internationally recognized principles on standard-
portland cement-based plaster installed over mechanically
ization established in the Decision on Principles for the
attached lath.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.3 The test methods are suitable for use in both laboratory
Barriers to Trade (TBT) Committee.
and field samples. No correlation shall be made between
laboratory and field testing.
2. Referenced Documents
1.4 The test methods are not intended to evaluate the
performance of the underlying construction or framing mem-
2.1 ASTM Standards:
bers. Test results on a particular building may be variable
C11Terminology Relating to Gypsum and Related Building
depending on the specimen location, condition, and
Materials and Systems
installation, and are subject to interpretation by the test
C219Terminology Relating to Hydraulic Cement
specifier.
C926Specification for Application of Portland Cement-
Based Plaster
1.5 The test methods are not intended to evaluate the
performance of coatings applied to the surface of the portland C1063Specification for Installation of Lathing and Furring
cement-based plaster. to Receive Interior and Exterior Portland Cement-Based
Plaster
C1583/C1583MTest Method for Tensile Strength of Con-
1 crete Surfaces and the Bond Strength or Tensile Strength
ThistestmethodisunderthejurisdictionofASTMCommitteeC11onGypsum
and Related Building Materials and Systems and is the direct responsibility of
of Concrete Repair and Overlay Materials by Direct
Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Tension (Pull-off Method)
Related Products.
D3665Practice for Random Sampling of Construction Ma-
Current edition approved March 1, 2018. Published March 2018. DOI: 10.1520/
C1860-18. terials
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1860 − 18
E2359/E2359MTest Method for Field Pull Testing of an 4.3 When the test methods contained in this standard are
In-Place Exterior Insulation and Finish System Clad Wall used on test specimens installed on existing structures, the test
Assembly
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