1、Designation: C265 08Standard Test Method forWater-Extractable Sulfate in Hydrated Hydraulic CementMortar1This standard is issued under the fixed designation C265; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 assum
3、ed 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 parentheses
4、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 Standard IEEE/ASTM SI-10 ofmeasurements made in other units.1.4 This standard does not purport to address all of thesafety concern
5、s, 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:2C109/C109M Test Method for Compressive Str
6、ength ofHydraulic Cement Mortars (Using 2-in. or 50-mm CubeSpecimens)C114 Test Methods for Chemical Analysis of HydraulicCementC150 Specification for Portland CementC219 Terminology Relating to Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic Consi
7、stencyC563 Test Method for Approximation of Optimum SO3inHydraulic Cement Using Compressive StrengthC595 Specification for Blended Hydraulic CementsC778 Specification for SandC1157 Performance Specification for Hydraulic CementD1193 Specification for Reagent WaterE11 Specification for Woven Wire Tes
8、t Sieve Cloth and TestSievesIEEE/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 C219.4. Significance and Use4.1 Excess soluble sulfate ions in hard
9、ened 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 SpecificationC595 for those cements in which optimized
10、SO3exceeds thetable limit. This test method also can provide useful informa-tion on other hydraulic cements, such as those specified inSpecifications C150 and C1157.4.2 When this test method is used in conjunction with TestMethod C563, use the appropriate age of test specimens (24 h,3 days, or 7 day
11、s) to coincide with the age of specimens usedin Test Method C563.5. 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 Practice C305.5.3
12、 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 responsibility of S
13、ubcommittee C01.28 on Sulfate ContentCurrent edition approved May 1, 2008. Published June 2008. Originallyapproved in 1951. Last previous edition approved in 2006 as C265 06. DOI:10.1520/C0265-08.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
15、United StatesNOTICE: This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International (www.astm.org) for the latest information15.4 Mortar and PestleA mortar of 1.5-L (112-qt) size, anda pestle, both of which shall be iron or porcelain.5.5 Water BathA wa
16、ter 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 Specification D1193.6.2 Graded SandSand conforming to the requirements forgraded sand in Specification C778.7. Temperature and Relative Humid
17、ity7.1 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 the temperature of themortar, immediately upon completion of mixing is 23 6 1C.7.2 Maintain the relative humidity of the laboratory so thatit
18、 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 on Compositionof Mortars of Test Method C109/C109M, except use a water-cementious material ratio of 0.5, by mass. Mix mechanically inaccordance
19、 with Procedure for Mixing Mortars of PracticeC305.8.2 Split the batch immediately after mixing then placeapproximately 450 g of mortar in each of the two 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
20、 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 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
21、.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, remove thecontainers successively from the water bath, pulverizing eachsample in turn with the pestle in the mortar as rapidly aspossible. Immediately
22、upon removal from the water bath treateach sample individually as follows: First pulverize approxi-mately one third of the specimen until most of it passes 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
23、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 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 s
24、peed 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 slurry 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. F
25、ilter 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 clear 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
26、(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 reagents in use in the analysis.11.1.1 After the BaCl2solution is added in accordance withthe sulfur trioxide determination section of Test Methods
27、C114,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 factor 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
28、 5 W 36.86 (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 specimens.13. Precision and Bias13.1 PrecisionThe single-operator (within-laboratory)standard deviation for testing at 24 h has been found to be0.077
29、 g/L SO3throughout the range of 0.20 to 0.85 g/L SO3.Therefore, results of two properly conducted tests at 24 h bythe same operator on water-extractable SO3in hardenedhydraulic cement mortars of the same material should not differfrom each other by more than 0.22 g/L SO3. The multi-laboratory (betwe
30、en-laboratory) standard deviation for testingat 24 h has been found to be 0.137g/L SO3throughout therange of 0.20 to 0.85 g/L SO3. Therefore, results of twoproperly conducted tests at 24 h on the same material, from twodifferent laboratories on water-extractable SO3in hardenedhydraulic cement mortar
31、s 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 hydraulic cement mortars,because no reference samples are available.14. Keywords14.1 hydraulic
32、cement; optimum sulfate content; sulfate;sulfate contentC265 082For additional useful information on details of cement test methods, reference may be made to the “Manual of CementTesting,” Annual Book of ASTM Standards, Vol 04.01.SUMMARY OF CHANGESCommittee C01 has identified the location of selecte
33、d changes to this test method since the last issue,C265 06, that may impact the use of this test method. (Approved May 1, 2008)(1) Revised paragraph 13.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
34、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 technical committee and must be reviewed ev
35、ery 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 tech
36、nical 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 Conshohoc
37、ken, 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 083
