ASTM C942/C942M-21

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C942 − 15 C942/C942M − 21
Standard Test Method for
Compressive Strength of Grouts for Preplaced-Aggregate
Concrete in the Laboratory
This standard is issued under the fixed designation C942;C942/C942M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers the determination of the compressive strength of hydraulic cement grout for preplaced-aggregate (PA)
concrete.
1.2 The values stated in either SI units or inch-pound units are to be regarded as standard.separately as standard. The values stated
in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of
the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns
to skin and tissue upon prolonged exposure.
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:
C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube Specimens)
C125 Terminology Relating to Concrete and Concrete Aggregates
C219 Terminology Relating to Hydraulic and Other Inorganic Cements
C937 Specification for Grout Fluidifier for Preplaced-Aggregate Concrete
C938 Practice for Proportioning Grout Mixtures for Preplaced-Aggregate Concrete
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.41 on
Hydraulic Cement Grouts.
Current edition approved Aug. 1, 2015April 1, 2021. Published October 2015April 2021. Originally approved in 1981. Last previous edition approved in 20102015 as
C942–10.–15. DOI: 10.1520/C0942-1510.1520/C0942-21
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol. 04.02.
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C942/C942M − 21
C939 Test Method for Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)
C1437 Test Method for Flow of Hydraulic Cement Mortar
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminologies C125 and C219.
4. Summary of Test Method
4.1 Compressive strength of hardened grout is determined using top-restrained cubes as defined in Test Method C109/C109M.
5. Significance and Use
5.1 This test method affords a means for determining the compressive strength of grouts that expand and, in use, harden under
conditions of partial to total restraint.
5.2 It is particularly applicable for determining the effect on compressive strength of grout fluidifier to be used with grout for PA
concrete (See Specification C937).
6. Apparatus
6.1 Scales, masses, sieves, glass graduates, and three-gang molds, for 2-in. (or 50-mm) 50 mm [2 in.] cube specimens, baseplates,
trowel, and testing machine as specified in Test Method C109/C109M.
6.2 Plates, to cover specimen molds, capable of supporting the weight or being held down by C-clamps, as described in 10.3.
6.3 Mass of 7 kg (or 15 lb) 7 kg [15 lb] or C-clamps, for holding down the cover plates.
7. Temperature and Humidity
7.1 Temperature and humidity conditions for tests performed in the laboratory shall be in accordance with Test Method
C109/C109M unless otherwise specified.
7.2 Temperature and humidity conditions for tests performed in the field shall be as prescribed for cu
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