1、Designation:C26508Standard 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 revision
2、.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 assumed to repre
3、sent 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 are for infor
4、mationonly.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 concerns,if any,asso
5、ciated 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 Strength ofHydraulic
6、 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 ConsistencyC563 Test Met
7、hod 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 Test Sieve Cloth and T
8、estSievesIEEE/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 hardened cement canresult i
9、n 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 SO3exceeds thetable limit
10、.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 days)to coincide with the age of
11、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 Polyethylene ContainersWatertight po
12、lyethylene 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 Subcommittee C01.28 on Sulfate ContentCurren
13、t 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 serviceastm.org.For Annual Book of ASTMStandards v
14、olume 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.United States1 5.4 Mortar and PestleA mortar of 1.5-L(112-
15、qt)size,anda pestle,both of which shall be iron or porcelain.5.5 Water BathA water 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 requir
16、ements forgraded sand in Specification C778.7.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 the temperature of themortar,immediately upon completion of mixing is 23 6 1 C.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
