1、Designation: D 6532 00 (Reapproved 2006)Standard Test Method forEvaluation of the Effect of Clear Water Repellent Treatmentson Water Absorption of Hydraulic Cement MortarSpecimens1This standard is issued under the fixed designation D 6532; the number immediately following the designation indicates t
2、he 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method evaluates the effectiveness of
3、clearwater repellents on hydraulic cement mortar specimens basedon water absorption after a water soak.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,
4、 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. Referenced Documents2.1 ASTM Standards:2C 109/C 109M Test Method for Compressive Str
5、ength ofHydraulic Cement Mortars(Using 2-in. or 50-mm CubeSpecimens)D 1475 Test Method For Density of Liquid Coatings, Inks,and Related ProductsD 3924 Specification for Environment for Conditioning andTesting Paint, Varnish, Lacquer, and Related MaterialsE 145 Specification for Gravity-Convection An
6、d Forced-Ventilation Ovens3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 clear water repellent, na coating formulated for thepurpose of protecting porous substrates by reducing the pen-etration of liquid water.4. Summary of Test Method4.1 The masonry unit is immersed in a cle
7、ar water repellent,removed and allowed to cure at ambient condition for 7 days.Any deviations should be noted in 10.1.2. After cure, themasonry unit is weighed and placed in water to a depth of 6.3mm (14 in.) for 3 days. After the immersion period, themasonry unit is removed and reweighed. The water
8、 repellencyvalue of the treatment is then calculated using a comparison tountreated control specimens.5. Significance and Use5.1 Siliceous alkaline substrates are subject to water damagethat may result in deterioration. Water repellents can provideprotection of siliceous alkaline substrates exposed
9、to water.This test method is used to evaluate the efficacy of clear waterrepellents on alkaline substrates.6. Apparatus6.1 Forced Draft Oven, Type 1B, in accordance with theType Section of Specification E 145.6.2 Balance, having a capacity of not less than 400 g, andsensitivity of 0.01 g.6.3 Reservo
10、ir Water Pan, capable of maintaining the waterlevel at 6.3 mm (14 in.) in depth with noncorroding rods for thespecimens to sit off the bottom.6.4 Stiff Bristle Brush, to brush the masonry units.6.5 Pressurized Air Source, to blow residual material off thebrushed masonry units.6.6 Stopwatch.1This tes
11、t method is under the jurisdiction 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, 2006. Published June 2006. Originallyapproved in 2000.
12、Last previous edition approved in 2000 as D 6532 - 00.2For 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.1Copyri
13、ght ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Reagents and Materials7.1 Masonry Units, 51 by 51 by 51 mm (2 by 2 by 2 in.)masonry units prepared in accordance with procedures outlinedin Test Method C 109/C 109M with the form release oi
14、lremoved can be used.8. Procedure8.1 Select substrates needed, brush, and blow off dust withpressurized air. The specimens must be free of loose materialthat may be lost and alter the weight. They also must be free ofmaterial that will alter the absorption characteristics.8.2 Label each piece. Run t
15、riplicate samples for each waterrepellent treatment. Also include three untreated controlsamples for each series. All specimens in one series of testingshould come from the same lot of masonry units.NOTE 1To make comparison between test series, a positive controlneeds to be included. For example, wh
16、en using mortar cubes, 40 %isobutyltrimethoxysilane in solvent can be used as a positive control ineach series.8.3 For the specimen to be treated, measure the surface areaof each test specimen to the nearest 5 mm2(0.1-in.2) and weighto the nearest 0.1 g. Record the weight and area of the uncoatedtes
17、t specimens.8.4 Dry the required number of specimens in a forced draftoven, as specified in Specification E 145, at a temperature of 806 5C until a constant weight has been reached. A constantoven weight shall be assumed when the specimen weighed tothe nearest 0.1 g loses not more than 0.1 % in any
18、4-h period.8.5 Allow specimens to cool at standard room temperatureand humidity as specified in Specification D 3924, weighspecimens, and allow to reach a constant weight under standardconditions. A constant weight at standard conditions shall beassumed when the specimen weighed to the nearest 0.1 g
19、 losesnot more than 0.2 % in any 24-h period.8.6 Calculate the amount of material to apply to obtain thespecified coverage based on manufacturers instructions afterdetermining the density as g/mL = Kg/L (weight/gal) inaccordance with Test Method D 1475. Then use the followingequation:G 5454 3 D 3 A1
20、44 3 coverage rate in m2/L ft2/gal!(1)where:D = density of the water repellent test material, kg/L(lb/gal),A = area of the test specimen, mm2(in2), andG = weight of water repellent test material needed to obtainthe desired coverage rate, g.8.7 Totally immerse the specimen in the water repellenttreat
21、ment to be tested until appropriate coverage rate isreached. Actual coverage rate and variation from manufactur-ers suggested coverage rate should be reported in 10.1.2.Remove from treatment and allow to drain for 1 min. Select abottom and top face of the cube. Place cube top face down onthe rack to
22、 cure. Allow cubes to cure at standard roomtemperature and humidity, as specified in Specification D 3924,for 7 days to ensure a constant weight is reached. If laboratoryconditions are different than those specified, ensure laboratoryconditions are constant and record laboratory conditions everyday
23、throughout test period and report in 10.1.2.8.8 After 6 days, weigh cubes to nearest 0.1 g. Allow onemore day to cure and weigh again. Compare weights at Day 6and Day 7 to ensure that a constant weight is reached. If aconstant weight is not reached, repeat every day until aconstant weight is reached
24、. A constant weight at standardconditions shall be assumed when the specimen weighed to thenearest 0.1 g loses not more than 0.2 % in any 24-h period.8.9 Record weight of dry treated specimens as Wtdand dryuntreated specimens as Wd. Place specimens in the waterreservoir, top face up, on noncorroding
25、 rods or any method thatallows the specimens to sit off the bottom of the pan and be incontact with the water on all sides. The water level in thereservoir or pan should be keep constant at 6.3 mm (14 in.) withtap water at room temperature, as specified in SpecificationD 3924, for 3 days. The 6.3 mm
26、 (14 in.) is measured from thebottom of the specimens. Do not cover or put a lid on the pan,but ensure that the water level is kept at 6.3 mm (14 in.).8.10 Remove the specimens from the water after 3 days,blot with damp cloth to remove excess water, and weighimmediately. Record weights of saturated
27、treated specimens asWtsand saturated untreated specimens as Ws. Calculate waterexclusion and water absorption.9. Calculation9.1 Calculate the mean weight gain for the untreated con-trols and record as Wc.Wc5 Wg11 Wg21 Wg3!/3. (2)where:Ws= weight of untreated masonry unit after water immer-sion,Wd= w
28、eight of untreated masonry unit before water im-mersion, andWg= Ws Wd.9.2 Calculate water exclusion (WE) value in percent, foreach specimen as follows:WE,%5 Wc Wts Wtd! 3 100/ Wc! (3)where:Wc= average weight gain for the untreated controls,Wts= weight of treated masonry unit after water immer-sion,
29、andWtd= weight of treated masonry unit before water immer-sion.9.3 Calculate the mean percent WE value for each three-specimen set.9.4 Calculate the water absorption (WA, %) value in percent,for each three-specimen set as follows:WA,%5 Wts Wtd! 3 100/Wtd!; (4)orWs Wd! 3 100!/Wd! (5)9.5 Calculate the
30、 mean percent WA value for each three-specimen set.10. Report10.1 Report the following information:D 6532 00 (2006)210.1.1 Report the mean water exclusion and water absorp-tion of each coating, and10.1.2 Report any significant deviations from the testmethod as described herein.11. Precision and Bias
31、11.1 The precision and bias of this procedure have not yetbeen determined.12. Keywords12.1 hydraulic cement mortar specimens; water absorption;water repellent effectiveness; water repellent treatmentsASTM International takes no position respecting the validity of any patent rights asserted in connec
32、tion 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 responsib
33、le 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 con
34、sideration 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
35、Barr Harbor 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).D 6532 00 (2006)3
