1、Designation: D6489 99 (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 adoptio
2、n 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 provides a procedure for the determi-nation of the water a
3、bsorption by 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
4、are for informationonly.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 prio
5、r to use.2. Referenced 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,
6、 and Related MaterialsE145 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 th
7、e water repellentare 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 haverecogni
8、zed the need for a standardized 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 theeffectiv
9、e water repellency of the coating 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 lea
10、st 149C (300F).5.3 Metal Pan, at least 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
11、 defined inSpecification E145.5.7 Reagent Water, as defined by Type IV of SpecificationD1193.5.8 Sealing Material, having very low permeability towater. Sealing material must meet the requirements of Section6.NOTE 1Sealing materials that in general meet the requirements thatare defined in Specificat
12、ion D1763, Type I, Grade 1, (two componentepoxies, epichlorohydrin/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 juri
13、sdiction of ASTM Committee D01 on Paintand Related Coatings, 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 ap
14、proved in 2006 as D6489 99 (2006).DOI: 10.1520/D6489-99R12.2For 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.Co
15、pyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 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
16、, except completelysubmerged the specimens so that the water level is 25.4 mm(1.0 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 %.NOTE 2It is recommended to recheck the se
17、aling 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 beused. Cor
18、es should be pulled in such a manner as not todamage the integrity of the surface. See Test Method C42/C42M for guidance.8. Preparation of Specimens8.1 Clean the sides and both faces of the specimens of allloose dust or cement paste from the core drilling process. Usecompressed air or water and a so
19、ft brush only, more vigorouscleaning methods may damage some water repellent coatings.8.2 Dry the specimens in a forced draft oven for 24 h at75C 6 5C (167 F 6 9F) until two successive weighings atintervals of 2 h show an increment of loss not greater than0.2 % of the last previously determined weig
20、ht.8.3 After drying, remove the specimens from the oven andallow them to cool to room temperature under ambientconditions (see Specification D3924). Weigh each specimen tothe nearest 0.1 g and record weight as WA.8.4 Prepare sufficient wax or epoxy material to adequatelycoat all the specimens. If us
21、ing wax, melt enough in a suitablecontainer or if using a two-component coating, mix quantitiesthat can be applied during the pot-life of the coating.8.5 To keep the sealing material from contaminating thetreated top surface and the bottom untreated surface of thespecimen, place duct tape over these
22、 areas and cut the tapearound the circumference so that there is no overlap on thelongitudinal sides of the core.8.6 Apply the sealing material to the specimens by eitherplacing the longitudinal side of the specimen in the sealingmaterial (place enough sealing material in the container so it isat le
23、ast to a depth of 6.4 mm (0.25 in.) and roll the specimentwo to three revolutions, or brush on the sealing material. Becareful not to get any of the sealing material on the treated face.8.7 Remove the specimen from the sealing material andplace treated specimen face up on a firm surface.8.8 Repeat 8
24、.5 and 8.6 after 3 min have elapsed.8.9 Carefully remove the duct tape from the specimen.8.10 Using a brush apply sealing material to any pin holesor holidays that appear in the coating. Allow some of thesealing material to overlap the specimens top edge.NOTE 3Specimens removed by core drilling may
25、have top surfacesthat are chipped. These areas should be coated with the sealing materialsince some or all of the water repellent may of been removed in theseareas.8.11 Allow the specimens to cool to room temperature.8.12 When specimens are cooled to room temperaturerecheck for any pin holes and app
26、ly sealing material ifnecessary.9. Procedure9.1 Weight each specimen to the nearest 0.1 g and recordweight as W1.9.2 Place specimens treated or exposed side of specimensface down in container. Specimens should be placed on glassrods that are in the bottom of container so water is free tocirculate un
27、der the specimens.9.3 Fill container with reagent grade water until level is 6.4cm (2.5 in.) from the top of the glass rods. Water shall not comein contact with opposite face of the core.9.4 Soak the cores for 48 h. At the 24 and 48-h immersionperiod, remove the specimens from the water and wipe wit
28、h adamp cloth and weight to the nearest 0.1 g and record as W2.9.5 Determine the percent of water absorbed by eachspecimen as follows:Percent Absorption 5100 3 W22 W1!WA(1)10. Report10.1 Report the following information:10.1.1 Type and size of concrete specimens.10.1.2 Water repellent treatment used
29、, application rate andmethod of application.10.1.3 Percent water absorption of each specimen, and10.1.4 Any deviation from this procedure.11. Precision and Bias11.1 PrecisionPrecision for this test method has not beendetermined at this time.11.2 BiasBias for this test method cannot be determinedsinc
30、e there is no reference standard available for comparison.12. Keywords12.1 field treatment evaluation; water absorption; waterrepellentD6489 99 (2012)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Use
31、rs 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 technical committee and must be reviewed every
32、 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 technic
33、al 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 Harbor Drive, PO Box C700, West Conshohocken
34、, 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/).D6489 99 (2012)3
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