ASTM_C_1860_-_19.pdf

Designation:C186019Standard Test Methods forMeasurement of Tensile Strength or Bond Strength ofPortland Cement-Based Plaster by Direct Tension1This standard is issued under the fixed designation C1860;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover procedures for determiningthe tensile strength of a section of portland cement-basedplaster,the bond strength between portland cement-basedplaster and a solid plaster base,or the fastener pull-out or lathpull-over strength for portland cement-based plaster bases overframing in either an exterior(stucco)or interior application.The test procedures are destructive in nature within thelocalized test areas and,after testing is concluded,requireappropriate repair of the finish system as well as any underly-ing materials damaged during testing.1.2 The test methods are suitable for use on portlandcement-based plaster finish systems on both new and existingconstruction.Test method shall be conducted a minimum of28 days after application of the portland cement-based plaster.Test MethodAshall be used to determine the tensile strength orbond strength of direct-applied portland cement-based plasterand may be useful in evaluating the efficacy of different surfacepreparation characteristics,bonding agents,or both.TestMethod B shall be used to determine the tensile strength ofportland cement-based plaster installed over mechanicallyattached lath.1.3 The test methods are suitable for use in both laboratoryand field samples.No correlation shall be made betweenlaboratory and field testing.1.4 The test methods are not intended to evaluate theperformance of the underlying construction or framing mem-bers.Test results on a particular building may be variabledependingonthespecimenlocation,condition,andinstallation,and are subject to interpretation by the testspecifier.1.5 The test methods are not intended to evaluate theperformance of coatings applied to the surface of the portlandcement-based plaster.1.6 The test methods are not intended to be a pre-construction qualifier to determine if the surfaces are appro-priate for application of portland cement plaster.The testmethods are intended to be used as a tool to quantitativelyevaluate existing portland cement plaster cladding that issuspected of questionable bond or uncertain fastening to thesubstrate.1.7 The values stated in inch-pound units are to be regardedas the standard.SI values in parentheses are provided forinformation only.1.8 This standard may involve hazardous materials,operations,or equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety,health,and environmental prac-tices and determine the applicability of regulatory limitationsprior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC219 Terminology Relating to Hydraulic CementC926 Specification for Application of Portland Cement-Based PlasterC1063 Specification for Installation of Lathing and Furringto Receive Interior and Exterior Portland Cement-BasedPlasterC1583/C1583M Test Method for Tensile Strength of Con-crete Surfaces and the Bond Strength or Tensile Strengthof Concrete Repair and Overlay Materials by DirectTension(Pull-off Method)D3665 Practice for Random Sampling of Construction Ma-terials1This test method is under the jurisdiction ofASTM Committee C11 on Gypsumand Related Building Materials and Systems and is the direct responsibility ofSubcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved March 1,2019.Published April 2019.Last previousedition approved in 2018 as C1860 18.DOI:10.1520/C1860-19.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 E2359/E2359M Test Method for Field Pull Testing of anIn-Place Exterior Insulation and Finish System Clad WallAssembly2.2 American So