1、Designation:D648999(Reapproved 2012)Standard Test Method forDetermining the Water Absorption of Hardened ConcreteTreated With a Water Repellent Coating1This standard is issued under the fixed designation D6489;the number immediately following the designation indicates the year oforiginal adoption or
2、,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 provides a procedure for the determi-nation of the water absorption b
3、y a core of concrete taken froma surface treated with a water repellent.1.2 The intended use of the water repellent coating is toreduce the amount of water that absorbs into the substrate.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for info
4、rmationonly.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 practices and determine the applica-bility of regulatory limitations prior to use.2.Refe
5、renced Documents2.1 ASTM Standards:2C42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteD1193 Specification for Reagent WaterD1763 Specification for Epoxy ResinsD3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related Materi
6、alsE145 Specification for Gravity-Convection and Forced-Ventilation OvensE898 Test Method of Testing Top-Loading,Direct-ReadingLaboratory Scales and Balances3.Summary of Test Method3.1 The specimen is dried to a constant weight and theportions of the specimen not treated with the water repellentare
7、sealed with an impervious sealing material.The specimensare weighed and immersed in water.The specimens areremoved from the water,weighed,and a percent water absorp-tion is calculated.4.Significance and Use4.1 Researchers in the field of water repellent coatings haverecognized the need for a standar
8、dized test for determining theperformance of water repellents applied to structures in thefield.Many coating manufacturers supply warranties for theirproducts based on maintaining a specific water repellency onconcrete.This test method can be used to determine theeffective water repellency of the co
9、ating by comparing itsperformance to a control uncoated specimen.5.Apparatus and Materials5.1 Balance,having a capacity of not less than 4000 g(8.81lb)and a sensitivity of 0.1 g,(0.0002 lb)as tested inaccordance with Test Method E898.5.2 Hot Plate,capable of at least 149C(300F).5.3 Metal Pan,at leas
10、t 20.3 cm long by 15.2 cm wide and5.1 cm deep(8 in.long by 6 in.wide and 2 in.deep),suitableto melt the wax or mix the epoxy.5.4 Brush,Duck Tape.5.5 Container,suitable for holding the water to immerse thespecimens.5.6 Forced Draft Oven,Type IIA or IIB,as defined inSpecification E145.5.7 Reagent Wate
11、r,as defined by Type IV of SpecificationD1193.5.8 Sealing Material,having very low permeability towater.Sealing material must meet the requirements of Section6.NOTE1Sealing materials that in general meet the requirements thatare defined in Specification D1763,Type I,Grade 1,(two componentepoxies,epi
12、chlorohydrin/Bisphenol A and polyamine+Bisphenol A)orwaxes used in the investment casting industry.Paraffin waxes are notacceptable.6.Sealing Material6.1 Use hardened concrete specimens as described in 7.1.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings
13、,Materials,and Applications and is the direct responsibility ofSubcommittee D01.47 on Concrete,Stone and Masonry Treatments.Current edition approved June 1,2012.Published August 2012.Originallyapproved in 1999.Last previous edition approved in 2006 as D6489 99(2006).DOI:10.1520/D6489-99R12.2For refe
14、renced 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 Conshoh
15、ocken,PA 19428-2959.United States1 6.2 Follow the procedures of Section 8,except for 8.4 and8.5.Instead use the sealing material to completely seal thespecimen,top,bottom and sides.6.3 Follow the procedures of Section 9,except completelysubmerged the specimens so that the water level is 25.4 mm(1.0
16、in.)over the top of the specimen.6.4 After the specimens have been submerged in water for48 h,acceptable sealing materials shall have a percent absorp-tion of less then 0.1%.NOTE2It is recommended to recheck the sealing material if a newbatch is used or if the formulation of the sealing material has changed.7.Test Specimen7.1 Typical test specimens are hardened concrete cores,approximately 7.0 cm(2.75 in.)in diameter and 7.5 cm(2 to 3in.)in length.A minimum of three cores for each test shall beu
