1、Designation:D426383(Reapproved 2018)Standard Test Method forIndicating Moisture in Concrete by the Plastic SheetMethod1This standard is issued under the fixed designation D4263;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method is used to indica
3、te the presence ofcapillary moisture in concrete.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to
4、 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.For specific caution statements,see Secti
5、on 4.1.4 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 TechnicalBarrier
6、s to Trade(TBT)Committee.2.Significance and Use2.1 Capillary moisture in the concrete may be detrimental tothe performance of certain coating systems that cannot toleratemoisture on or within the surface boundary.2.2 This test method is used prior to the application ofcoatings on concrete.3.Material
7、s3.1 TransparentPolyethyleneSheet,commerciallyavailable,approximately 4 mils(0.1 mm)thick.3.2 Adhesive Tape that will adhere to the substrate.(Ducttape 2 in.(50 mm)wide is suggested.)4.Cautions4.1 This test method shall be conducted when the surfacetemperature and ambient conditions are within the e
8、stablishedparameters for application of the coating system.4.2Avoid direct sunlight,direct heat,or damage to theplastic sheet,as such treatment affects the reliability of theresults.5.Procedure5.1 Tape a segment of plastic sheet,approximately 18 by 18in.(457 by 457 mm),tightly to the concrete surfac
9、e makingsure that all edges are sealed.5.2 Allow the plastic sheet to remain in place a minimum of16 h.5.3 After the allowed time has elapsed,remove the plasticsheet and visually inspect the underside of the sheet and theconcrete surface of the patch for the presence of moisture.5.4 Sampling:5.4.1 F
10、loorsOne test area per 500 ft2(46 m2)or portionthereof,of surface areas unless otherwise specified.5.4.2 Walls and CeilingsOne test area per 500 ft2(46 m2)or portion thereof,of surface area unless otherwise specified.5.4.3 The recommended practice is a minimum of one testfor each 10 ft(3 m)of vertic
11、al rise in all elevation startingwithin 12 in.(300 mm)of the floor.6.Report6.1 Report the presence or absence of moisture.7.Precision and Bias7.1 This test method indicates the presence of capillarymoisture.This method is purely qualitative.No precision orbias has been established for this test meth
12、od.8.Keywords8.1 concrete;moisture1This test method is under the jurisdiction of ASTM Committee D33 onProtective Coating and Lining Work for Power Generation Facilities and is the directresponsibility of Subcommittee D33.05 on Application and Surface Preparation.Current edition approved Aug.1,2018.P
13、ublished August 2018.Originallyapproved in 1983.Last previous edition approved in 2012 as D4263 83(2012).DOI:10.1520/D4263-83R18.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with in
14、ternationally 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 ASTM International takes no position respecting
15、 the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard i
16、s subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you sh
