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Designation: C452/C452M − 26Standard Test Method forPotential Expansion of Portland-Cement and Portland-Limestone Cement Mortars Exposed to Sulfate 1This standard is issued under the f i xed designation C452/C452M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method, which is applicable only to portlandcements and portland-limestone cements, covers the determi-nation of the expansion of mortar bars made from a mixture ofportland cement or portland-limestone cement and gypsum insuch proportions that the mixture has a sulfur trioxide (SO 3 )content of 7.0 mass %.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard. Values in SI units [or inch-pound units] shallbe obtained by measurement in SI units [or inch pound units]or by appropriate conversion, using the Rules for Conversionand Rounding given in IEEE/ASTM SI 10, of measurementsmade in other units (or SI units). Values are stated in only SIunits when inch-pound units are not used in practice.1.3 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.(Warning—Fresh hydraulic cementitious mixtures are causticand may cause chemical burns to skin and tissue uponprolonged exposure.) 21.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 3C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars (Using 50 mm [2 in.] CubeSpecimens)C150/C150M Specif i cation for Portland CementC219 Terminology Relating to Hydraulic and Other Inor-ganic CementsC230/C230M Specif i cation for Flow Table for Use in Testsof Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC471M Test Methods for ChemicalAnalysis of Gypsum andGypsum Products (Metric)C490/C490M Practice for Use of Apparatus for the Deter-mination of Length Change of Hardened Cement Paste,Mortar, and ConcreteC511 Specif i cation for Mixing Rooms, Moist Cabinets,Moist Rooms, and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC595/C595M Specif i cation for Blended Hydraulic CementsC778 Specif i cation for Standard SandC1005 Specif i cation for Reference Masses and Devices forDetermining Mass and Volume for Use in Physical Testingof Hydraulic CementsD1193 Specif i cation for Reagent WaterIEEE/ASTM SI 10 Practice for Use of the InternationalSystem of Units (SI): The Modern Metric System3. Terminology3.1 Def i nitions:3.1.1 For def i nitions of terms used in this test method, referto Terminology C219.4. Interferences4.1 This test method is not suitable for establishing thesulfate resistance of blended hydraulic cements other than1 This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.29 on Sulfate Resistance.Current edition approved June 15, 2026. Published July 2026. Originallyapproved in 1960. Last previous edition approved in 2025 as C452 – 25. DOI:10.1520/C0452_C0452M-26.2 Section on Safety, Manual of Cement Testing, Annual Book of ASTMStandards, Vol 04.01.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1