ASTM_D_8271_-_21.pdf

Designation:D827121Standard Test Method forthe Direct Measurement of Surface Profile of PreparedConcrete1This standard is issued under the fixed designation D8271;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.Scope1.1 This test method is suitable for both field and laboratoryuse to quantify the depth of surface profile of preparedconcrete.It may also be used on unprepared concrete surfaces.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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:2D4417 Test Methods for Field Measurement of SurfaceProfile of Blast Cleaned SteelE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE178 Practice for Dealing With Outlying ObservationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 The depth of profile is measured using a fine pointedprobe at a predetermined number of locations,and the rangeand arithmetic mean of the maximum peak-to-valley distancesis determined.4.Significance and Use4.1 Proper bonding of coatings and linings to concretesurfaces requires proper cleaning and frequently requires theconcrete to be roughened to increase the surface area.Theroughness,also known as surface profile,can be imparted intoconcrete by abrasive blast cleaning,acid etching or variousimpact/scarifying power tools.The resulting surface profiledepth can influence coating/lining adhesion and performance.Coating/lining manufacturers or facility owners,or both,fre-quently specify cleaning and roughening of the concretesurface prior to product installation.The procedure describedherein enables the user to quantitatively determine the profiledirectly from the prepared concrete surface in multiple loca-tions.The procedure is similar to that described in Method B ofTest Methods D4417,which addresses measurement of surfaceprofile on abrasive blast cleaned steel surfaces.5.Apparatus5.1 A depth micrometer fitted with a remote pointed probe.The probe point is machined at a 60 included angle with anominal radius of 500 m at the tip and exerting a minimumforce of 75 g.The base of the probe has a surface area diameterbetween 20 mm and 25 mm.This base rests on the tops of thepeaks of the surface profile while the spring-loaded tip,protruding from the probe face projects into the valleys.Thedistance that the tip projects into the valley relative to the topsof the peaks is displayed.5.2 The depth micrometer must have a minimum upperrange of 6 mm(250 mils)and a manufacturer stated accuracyof 61%or greater.6.Test Surface6.1 Any concrete/masonry surface that is free of loosesurface interference material,dirt,dust,and abrasive residue.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Feb.1,2021.Published February 2021.Originallyapproved in 2019.Last previous edition approved in 2019 as D8271 19.DOI:10.1520/D8271-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright 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.1The instrument probe must sit flush on the concrete surface;care should be taken when measuring on curved surfaces.7.Procedure7.1 Verify instrument accuracy prior to each period of useby measuring a metal shim of known thickness placed ontoplate float glass(see 7.2).Both are usually supplied by theinstrument manuf