1、Designation:D708906(Reapproved 2014)Standard Practice forDetermination of the Effectiveness of Anti-Graffiti Coatingfor Use on Concrete,Masonry and Natural Stone Surfacesby Pressure Washing1This standard is issued under the fixed designation D7089;the number immediately following the designation ind
2、icates 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 practice covers a basic method for evaluati
3、ng theperformance of anti-graffiti products on mineral building sub-strates by a series of increasingly abrasive cleaning methods.The anti-graffiti materials are applied to a series of concrete,masonry and natural stone specimens for evaluation.Graffitiresistance is based on how a defined set of mar
4、kings areremoved by a designated set of cleaning techniques.1.2 This practice also defines a procedure to evaluate graffitiremoval after re-marking with subsequent re-cleaning.It doesnot address the re-treatment of substrates after a material is nolonger graffiti resistant.1.3 The values stated in S
5、I units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 and health pra
6、ctices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related MaterialsD6578 Practice for Determination of Graffiti Resistance3.Terminology3.1
7、Definitions:3.1.1 graffti resistant,nthe property of coatings to beresistance to the application of graffiti or exhibit easy removalof graffiti without surface damage,or both.3.1.2 non-sacrificial anti-graffti coatings,nthe propertyof a coating in which they remain intact or undamaged after theremov
8、al of graffiti from their surface.3.1.3 sacrificial anti-graffti coatings,nthe property ofcoatings in which they are destroyed or damaged during theremoval of graffiti,therefore requiring subsequent re-application.4.Summary of Practice4.1 Spray paints and markers are applied to a series ofconcrete,m
9、asonry and natural stone test panels pre-treatedwith the product(s)to be evaluated.The paint(s)and mark(ers)are removed using a series of commercial building cleaningmethods which begin with the least aggressive method,high-pressure water wash with a commercial graffiti cleaner andproceed to increas
10、ingly aggressive cleaning methods such ashigh-pressure hot water wash and high-pressure sodium bicar-bonate wash.5.Significance and Use5.1 Graffiti on buildings and structures is a significantproblem in various regions across the country.A variety ofcoatings have been developed to be either resistan
11、t to theapplication of paints/marker or to aid in their removal.Thisstandard practice describes a procedure for evaluating theeffectiveness of anti-graffiti coatings applied to variousconcrete,masonry and natural stone substrates.It does notaddress graffiti removal on metal or any other non-minerals
12、ubstrate.5.2 This practice only addresses graffiti removal on sub-strates in a laboratory environment,that have not been exposedto either natural or artificial weathering.Specification D6578describes a method for graffiti removal after both natural andartificial weathering.6.Apparatus6.1 Commercial
13、based graffiti removers used for concrete,masonry and stone surfaces are utilized to remove graffiti.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.47 on Concrete,Stone and Mas
14、onry Treatments.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 2006.Last previous edition approved in 2006 as D7089 06.DOI:10.1520/D7089-06R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For
15、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 States1 Follow manufacturer guidelines for application instructions.This is followed b
16、y high-pressure cold water washer to cleanthe substrate.6.2 High-pressure cold water washer,capable of maintain-ing a pressure of 800 to 1500 psi,equipped with a fan typespray tip that disperses water at an angle of at least 15 degrees,with a flow rate of 4 to 6 gal per minute.6.3 High-pressure hot water washer,capable of maintaininga pressure of 800 to 1500 psi,and temperatures of 140 to 180Fequipped with a fan type spray tip that disperses water at anangle of at least 15 degrees,with a flow ra