ASTM C265-2006 Standard Test Method for Water-Extractable Sulfate in Hydrated Hydraulic Cement Mortar《水化水硬水泥灰浆中的水可萃取硫酸的标准试验方法》.pdf

1、Designation: C 265 06Standard Test Method forWater-Extractable Sulfate in Hydrated Hydraulic CementMortar1This standard is issued under the fixed designation C 265; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r

2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the measurement of water-extractable SO3in hardened hydraulic cement mortar. Thismeasurement is as

3、sumed to represent unreacted, availablesulfate remaining in the mortar.1.1.1 WarningFresh hydraulic cementious mixtures arecaustic and may cause chemical burns to skin and tissue uponprolonged exposure.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parenthes

4、es are for informationonly.1.3 Values in SI units were obtained by measurement in SIunits or by appropriate conversion using the Rules for Conver-sion and Rounding given in IEEE/ASTM SI-10 Standard ofmeasurements made in other units.1.4 This standard does not purport to address all of thesafety conc

5、erns, 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 Compressiv

6、e Strength ofHydraulic Cement Mortars(Using 2-in. or 50-mm CubeSpecimens)C114 Test Methods for Chemical Analysis of HydraulicCementC 150 Specification for Portland CementC 219 Terminology Relating to Hydraulic CementC 305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plasti

7、c ConsistencyC 563 Test Method for Optimum SO3in Hydraulic CementUsing 24-h Compressive StrengthC 595 Specification for Blended Hydraulic CementsC 778 Specification for Standard SandC 1157 Performance Specification for Hydraulic CementD 1193 Specification for Reagent WaterE11 Specification for Wire

8、Cloth and Sieves for TestingPurposesIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System3. Terminology3.1 DefinitionsThe terms used in this test method aredefined in accordance with Terminology C 219.4. Significance and Use4.1 Excess soluble sulfate ion

9、s in hardened cement canresult in reduced durability. This test method is intended toshow whether calcium sulfate has been used in cement in suchamount to leave excess soluble sulfate in hardened mortar. Thetest method is used to establish compliance in SpecificationC 595 for those cements in which

10、optimized SO3exceeds thetable limit. This test method also can provide useful informa-tion on other hydraulic cements, such as those specified inSpecifications C 150 and C 1157.4.2 When this test method is used in conjunction with TestMethod C 563, use the appropriate age of test specimens (24 h,3 d

11、ays, or 7 days) to coincide with the age of specimens usedin Test Method C 563.5. Apparatus5.1 SieveA 2.36-mm (No.8) sieve conforming to Specifi-cation E11.5.2 Mixer, Bowl, and PaddleAn electrically driven me-chanical mixer equipped with a paddle and bowl, as specifiedin the Apparatus section of Pra

12、ctice C 305.5.3 Polyethylene ContainersWatertight polyethylene bagsof 1-L (1-qt) capacity or approximately 360-mm (14-in.) sheetmaterial, made using polyethylene at least 0.10-mm (0.004-in.)in thickness.1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct resp

13、onsibility of Subcommittee C01.28 on Sulfate Content.Current edition approved July 1, 2006. Published August 2006. Originallyapproved in 1951. Last previous edition approved in 2003 as C 265 03a.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at

14、serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

15、 United States.5.4 Mortar and PestleA mortar of 1.5-L (112-qt) size, anda pestle, both of which shall be iron or porcelain.5.5 Water BathAwater bath thermostatically controlled at23.0 6 0.15 C .6. Reagents and Materials6.1 Mixing WaterReagent water conforming to the nu-merical limits of Type II of S

16、pecification D 1193.6.2 Graded SandSand conforming to the requirements forgraded sand in Specification C 778.7. Temperature and Relative Humidity7.1 Maintain the temperature of the molding room at 23.0 62.0 C . Adjust the temperature of the dry materials and themixing water, prior to mixing, so that

17、 the temperature of themortar, immediately upon completion of mixing is 23 6 1C.7.2 Maintain the relative humidity of the laboratory so thatit is not less than 50 %.8. Preparation of Test Mortar8.1 Proportion the mortar in accordance with the instruc-tions for a six-cube batch given in the section o

18、n Compositionof Mortars of Test Method C 109/C 109M, except use awater-cementious material ratio of 0.5, by mass. Mix mechani-cally in accordance with Procedure for Mixing Mortars ofPractice C 305.8.2 Split the batch immediately after mixing then placeapproximately 450 g of mortar in each of the two

19、 polyethylenecontainers. Obtain the temperature of each portion to ensurethat it is within the range 23 6 1 C . If bags are used, twist theneck of each and seal with a rubber band; double the neck overand seal with a second band. If sheets are used to contain thesamples, gather the corners and edges

20、 to make a bag and sealin similar manner.9. Storage of Test Mortar9.1 Immediately immerse both containers in the water bathmaintained at (23.0 6 0.15 C) .10. Preparation of Cement Extract10.1 At 24 614 h, 3 days 6 1 h, or 7 days 6 3 h, after theinstant the cement and water were mixed together, remov

21、e thecontainers successively from the water bath, pulverizing eachsample in turn with the pestle in the mortar as rapidly aspossible. Immediately upon removal from the water bath treateach sample individually as follows: First pulverize approxi-mately one third of the specimen until most of it passe

22、s the2.36-mm (No. 8) sieve. Return the coarse residue to the mortarand grind another one third of the specimen as before. Repeatthe process until the entire specimen is pulverized to pass the2.36-mm (No. 8) sieve. Place 400 g of the pulverized materialin a 600-mL beaker and add 100 mL of water at a

23、temperatureof 23.0 6 0.6 C . Quickly mix to uniform consistency with aspatula; then stir mechanically for 2 min. Use a stirrer of sucha type and speed that all particles of the slurry are suspended,with no settling and no appreciable increase of the temperatureof the slurry occurs.10.2 Filter the sl

24、urry on a dry No. 2A Bchner funnel withthe aid of suction using a dry 90-mm, medium, ashless paper.Complete filtration within a period of 2 min. Filter again,whether the filtrate is turbid or not, using a new dry filter paperwithout suction.11. Analysis of the Extract11.1 Transfer 50.0 mL of the cle

25、ar extract by means of a50-mL pipet to a 400-mL beaker, dilute with distilled water toabout 250 mL, and add 5 mL of concentrated hydrochloric acid(HCl, sp gr 1.19). Heat to boiling, and proceed in accordancewith the sulfur trioxide determination section of Test MethodsC114. Perform a blank on the re

26、agents in use in the analysis.11.1.1 After the BaCl2solution is added in accordance withthe sulfur trioxide determination section of Test MethodsC114, boil the solution vigorously for 15 min.11.2 When the amount of filtrate is insufficient to provide a50-mL aliquot, use 25 mL of the extract and a fa

27、ctor twice thatgiven in Section 12.12. Calculation and Report12.1 Calculate the SO3content to the nearest 0.01 g/L ofsolution, as follows:SO3, g/L 5 W 3 6.86 (1)where:W = grams of barium sulfate (BaSO4) precipitated.12.2 Report the average of the two determinations.12.3 Report the age of the test sp

28、ecimens.13. Precision and Bias13.1 PrecisionThe single-operator (within-laboratory)standard deviation has been found to be 0.077 g/L SO3throughout the range of 0.20 to 0.85 g/LSO3. Therefore, resultsof two properly conducted tests by the same operator onwater-extractable SO3in hardened hydraulic cem

29、ent mortars ofthe same material should not differ from each other by morethan 0.22 g/L SO3. The multi-laboratory (between-laboratory)standard deviation has been found to be 0.137g/L SO3through-out the range of 0.20 to 0.85 g/L SO3. Therefore, results of twoproperly conducted tests on the same materi

30、al, from twodifferent laboratories on water-extractable SO3in hardenedhydraulic cement mortars should not differ from each other bymore than 0.39 g/L SO3.13.2 BiasNo justifiable statement can be made on the biasof the procedure in this test method for measuring thewater-extractable SO3in hardened hy

31、draulic cement mortars,because no reference samples are available.14. Keywords14.1 hydraulic cement; optimum sulfate content; sulfate;sulfate contentC265062For additional useful information on details of cement test methods, reference may be made to the “Manual of CementTesting,” Annual Book of ASTM

32、 Standards, Vol 04.01.SUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this test method since the last issue,C 265 03a, that may impact the use of this test method. (Approved July 1, 2006)(1) Revised the test method to allow the age of testing tocoincide with that o

33、f Test Method C 563.ASTM International takes no position respecting 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

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36、 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, 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).C265063