ASTM C845/C845M-18

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Designation: C845/C845M − 12 C845/C845M − 18
Standard Specification for
Expansive Hydraulic Cement
This standard is issued under the fixed designation C845/C845M; the number immediately following the designation indicates the year
of 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 specification covers hydraulic cements that expand during the early hardening period after setting.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of this standard.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C33C33/C33M Specification for Concrete Aggregates
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)
C114 Test Methods for Chemical Analysis of Hydraulic Cement
C183C183/C183M Practice for Sampling and the Amount of Testing of Hydraulic Cement
C185 Test Method for Air Content of Hydraulic Cement Mortar
C188 Test Method for Density of Hydraulic Cement
C465 Specification for Processing Additions for Use in the Manufacture of Hydraulic Cements
C688 Specification for Functional Additions for Use in Hydraulic Cements
C806 Test Method for Restrained Expansion of Expansive Cement Mortar
C807 Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle
3. Terminology
3.1 Definitions:
3.1.1 expansive cement (K)—an expansive cement containing anhydrous calcium aluminosulfate (4CaO·3Al O ·SO ), calcium
2 3 3
sulfate, and uncombined calcium oxide.
3.1.2 expansive cement (M)—an expansive cement containing calcium aluminate cement and calcium sulfate.
3.1.3 expansive cement (S)—an expansive cement containing tricalcium aluminate (C A) and calcium sulfate.
3.1.4 expansive hydraulic cement—a cement composed essentially of hydraulic calcium silicates, calcium aluminates and
calcium sulfates, which, upon being mixed with water, forms a paste that increases significantly in volume during the early
hardening period occurring after setting. This volume increase is due principally to the reaction of the calcium aluminates and
calcium sulfates.
3.1.5 shrinkage-compensating concrete—concrete that is internally restrained with resilient reinforcing and made with
expansive cement which induces both compressive stress in the concrete and positive steel strain that approximately off-sets tensile
stresses and negative strains induced by drying shrinkage.
This specification is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.13 on Special Cements.
Current edition approved Dec. 15, 2012July 1, 2018. Published February 2013July 2018. Originally approved in 1976. Last previous edition approved in 20042012 as
C845 – 04.C845 – 12. DOI: 10.1520/C0845_C0845M-12.10.1520/C0845_C0845M-18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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C845/C845M − 18
4. Classification
4.1 The cement covered by this specification is suitable for use in shrinkage-compensating concrete and shall be designated as
Type E-1.
NOTE 1—Three kinds of expansive cement are identified in Section 3 by the letters K, M, and S. The appropriate letter should be used as a suffix to
the type designation when one of these kinds is desired. Expansive cement may also be prepared in other ways.
5. Ordering Information
5.1 When it is desired that an optional requirement apply or that the cement be of a particular kind, a specific request to this
effect should be made by the purchaser.
6. Chemical Composition
6.1 Expansive cement shall conform to the requirements as to chemical composition prescribed in Table 1.
6.2 The purchaser has the option of specifying that the alkalies (Na O + 0.658K O) shall not exceed 0.60 % (See(see Table 2).
2 2
NOTE 2—This limit should be specified when the cement is to be used in concrete with aggregates that may be reactive. Reference should be made
to Specification C33C33/C33M for suitable criteria of deleterious reactivity.
7. Physical Properties
7.1 Expansive cement shall conform to the physical requirements prescribed in Table 3.
8. Additions
8.1 The cement covered by this specification shall contain no additions except as follows:
8.1.1 Water, or a functional addition, or both, that has been shown to meet the requirements of Specification C688, may be added
in amounts such that the limits shown in Table 1 for loss on ignition shall not be exceeded.
8.1.2 At the option of the manufacturer, processing additions may be used in the manufacture of the cement, provided such
materials in the amounts used have been shown to be not harmful in accordance with Specification C465.
9. Test Methods
9.1 The cement shall be sampled and the properties enumerated
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