1、Designation:D426383(Reapproved 2012)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 Department of Defense.1.Scope1.1 This test method is used to indicate t
3、he 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 add
4、ress 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 practices and determine the applica-bility of regulatory limitations prior to use.For specific cautionstatements,see Section 4.2.Significance
5、 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.Materials3.1 Transparent Polyethylene Sheet,com
6、mercially avail-able,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 establishedparameters for applicatio
7、n 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 surface makingsure that all edges are sea
8、led.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 FloorsOne test area per 500 ft2(46 m
9、2)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 vertical rise in all elevation startingwi
10、thin 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 method.8.Keywords8.1 concrete;moisture1
11、This 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 May 1,2012.Published May 2012.Originallyapprove
12、d in 1983.Last previous edition approved in 2005 as D4263 83(2005).DOI:10.1520/D4263-83R12.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 ASTM International takes no position respecting the validity of any patent rights asserted in conne
13、ction 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 is subject to revision at any time by the responsible
14、 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 consider
15、ation at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,at the address shown below.This standard is copyrighted by ASTM International,100 Barr Harb
16、or Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585(phone),610-832-9555(fax),or serviceastm.org(e-mail);or through the ASTM website(www.astm.org).Permission rights to photocopy the standard may also be secured from the ASTM website(www.astm.org/COPYRIGHT/).D4263 83(2012)2
