ASTM C845-96

Standard Specification for Expansive Hydraulic Cement

SCOPE
1.1 This specification covers hydraulic cements that expand during the early hardening period after setting.

General Information

• Status: Historical
• Publication Date: 31-Dec-1995
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C01 - Cement
• Drafting Committee: C01.13 - Special Cements

Relations

• Replaced By: ASTM C845-04 - Standard Specification for Expansive Hydraulic Cement
• Effective Date: 01-Jul-2004
• Referred By: ASTM C688-22 - Standard Specification for Functional Additions for Use in Hydraulic Cements
• Effective Date: 01-Jan-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 845 – 96
Standard Specification for
Expansive Hydraulic Cement
This standard is issued under the fixed designation C 845; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope calcium sulfates, which, upon being mixed with water, forms a
paste that increases significantly in volume during the early
1.1 This specification covers hydraulic cements that expand
hardening period occurring after setting. This volume increase
during the early hardening period after setting.
is due principally to the reaction of the calcium aluminates and
2. Referenced Documents
calcium sulfates.
3.1.5 shrinkage-compensating concrete—a concrete made
2.1 ASTM Standards:
with an expansive cement in which the expansion, if restrained,
C 33 Specification for Concrete Aggregates
induces compressive stresses that approximately offset tensile
C 109/C 109M Test Method for Compressive Strength of
stresses induced by drying shrinkage.
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube
Specimens)
4. Classification
C 114 Test Methods for Chemical Analysis of Hydraulic
4.1 The cement covered by this specification is suitable for
Cement
use in shrinkage-compensating concrete and shall be desig-
C 183 Practice for Sampling and the Amount of Testing of
nated as Type E-1.
Hydraulic Cement
C 185 Test Method for Air Content of Hydraulic Cement
NOTE 1—Three kinds of expansive cement are identified in Section 3
Mortar 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
C 188 Test Method for Density of Hydraulic Cement
cement may also be prepared in other ways.
C 465 Specification for Processing Additions for Use in the
Manufacture of Hydraulic Cements
5. Ordering Information
C 688 Specification for Functional Additions for Use in
5.1 When it is desired that an optional requirement apply or
Hydraulic Cements
that the cement be of a particular kind, a specific request to this
C 806 Test Method for Restrained Expansion of Expansive
3 effect should be made by the purchaser.
Cement Mortar
C 807 Test Method for Time of Setting of Hydraulic Ce-
6. Chemical Composition
ment Mortar by Modified Vicat Needle
6.1 Expansive cement shall conform to the requirements as
3. Terminology to chemical composition prescribed in Table 1.
6.2 The purchaser has the option of specifying that the
3.1 Definitions:
alkalies (Na O + 0.658K O) shall not exceed 0.60 % (See
2 2
3.1.1 expansive cement (K)—an expansive cement contain-
Table 2).
ing anhydrous calcium aluminosulfate (4CaO·3Al O ·SO ),
2 3 3
calcium sulfate, and uncombined calcium oxide.
NOTE 2—This limit should be specified when the cement is to be used
3.1.2 expansive cement (M)—an expansive cement contain- in concrete with aggregates that may be reactive. Reference should be
made to Specification C 33 for suitable criteria of deleterious reactivity.
ing calcium aluminate cement and calcium sulfate.
3.1.3 expansive cement (S)—an expansive cement contain-
7. Physical Properties
ing tricalcium aluminate (C A) and calcium sulfate.
7.1 Expansive cement shall conform to the physical require-
3.1.4 expansive hydraulic cement—a cement composed es-
ments prescribed in Table 3.
sentially of hydraulic calcium silicates, calcium aluminates and
8. Additions
This specification is under the jurisdiction of ASTM Committee C-1 on Cement
8.1 The cement covered by this specification shall contain
and is the direct responsibility of Subcommittee C01.13 on Special Cements.
no additions except as follows:
Current edition approved Jan. 10, 1996. Published March 1996. Originally
published as C 845–76 T. Last previous edition C 845–90.
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 04.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C845–96
TABLE 1 Standard Chemical Requirements
10.2 The manufacturer shall provide suitable facilities to
Composition, % enable the inspector to check the intergrinding or blending
operation used to produce cement by either means. The plant
Magnesium oxide (MgO), max 6.0
Insoluble residue, max 1.0
facilities for intergrinding or blending and inspection shall be
Loss on ignition, max 4.0
adequate to ensure compliance with the provisions of this
specification.
TABLE 2 Optional Chemical Requirements
11. Rejection
Alkalies (Na2O + 0.658 3 K2O) max, % 0.60
11.1 The cement may be rejected if it fails to meet any of the
requirements of this specification.
11.2 Cement remaining in bulk storage at the mill prior to
TABLE 3 Physical Requirements
shipment for a period greater than 6 months or cement in bags
Time of setting, min, minutes 75
Air content, max, vol % 12.0
in local storage in the hands of a vendor for more than 3
Restrained expansion of mortar:
months, after completion of the tests, may be retested for
7-day expansion:
expansion and may be rejected if it fails to conform to the
min, % 0.04
max, % 0.10
requirements of this specification for
...