ASTM C943-17

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Designation: C943 − 10 C943 − 17
Standard Practice for
Making Test Cylinders and Prisms for Determining Strength
and Density of Preplaced-Aggregate Concrete in the
Laboratory
This standard is issued under the fixed designation C943; 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 practice covers procedures for making standard test cylinders used to determine the compressive strength and density
of preplaced-aggregate (PA) concrete.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 safety, health, and healthenvironmental 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:
C125 Terminology Relating to Concrete and Concrete Aggregates
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C219 Terminology Relating to Hydraulic Cement
C637 Specification for Aggregates for Radiation-Shielding Concrete
C937 Specification for Grout Fluidifier for Preplaced-Aggregate Concrete
C938 Practice for Proportioning Grout Mixtures for Preplaced-Aggregate Concrete
C939C939/C939M Test Method for Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)
C940 Test Method for Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the Laboratory
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 Practice
4.1 Coarse aggregate is placed in a standard cylinder mold having end plates to which pipe fittings have been attached. Grout
is pumped into the mold until full. The test cylinder, demolded after hardening, may be cured and used for determination of strength
or cut into prisms for the determination of unit weight.
This practice 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 June 15, 2010Dec. 15, 2017. Published July 2010January 2018. Originally approved in 1980. Last previous edition approved in 20022010 as
C943 – 02.10. DOI: 10.1520/C0943-10.10.1520/C0943-17.
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
C943 − 17
5. Significance and Use
5.1 This practice is used for making test cylinders or prisms of PA concrete. Cylinders are used for determining compressive
strength and approximate density. Prisms, cut from cylinders, eliminate the surface effect and thus more accurately represent the
actual density of PA concrete in place.
6. Apparatus
6.1 Cylinder Molds (Fig. 1), cast iron or steel, for making 150 by 300-mm (6 by 12-in.) cylinders. Base and top plates shall be
arranged for tight assembly to the cylinder. All mating and inside surfaces shall be machined smooth such that the assembled mold
will be essentially watertight. End plates shall be drilled and tapped at their centers for standard 19 mm ( ⁄4-in.) pipe nipples. The
top end plate shall also be perforated, as shown in Fig. 2.
6.2 Venting Fabric, white cotton cloth, free of oil and grease.
6.3 Grouting Apparatus (Fig. 3), capable of delivering grout at a uniform rate of 1.4 to 2.8 L (0.05 to 0.10 ft )/min at pressures
up to 345 kPa (50 psi).
1 1
6.4 Mallet, with rubber or rawhide head weighing approximately ⁄4 kg ( ⁄2 lb).
6.5 Platform Scales, accurate to within 0.3 % of the test load at any point within the range of use.
6.6 Stop Watch, least reading not more than 0.2 s.
6.7 Flow Cone—See Test Method C939C939/C939M.
6.8 Thermometer, accurate to 0.5°C (1°F), for measuring ambient and grout temperatures.
7. Materials
7.1 Coarse Aggregate—Except when tests are made for specific projects, coarse aggregate shall conform to the requirements
of Specification C637, Table number 2, Coarse Aggregate, Grading 1, unless Grading 2 is specified.
7.2 Grout—Except when tests are made for specific projects, grout ingredients, proportioning, and mixing shall be in accordance
with Practice C938.
7.3 Tests for Specific Projects—When tests are to be made for specific projects, materials shall be representative of those in use
or proposed for use in the work.
7.3.1 If not taken from project-mixed grout being used in the work, grout materials shall be mixed in the laboratory using the
procedure described in Specification C937.
FIG. 1 Cylinder Mold Assembly Cross Section
C943 − 17
FIG. 2 End Plate Details
NOTE 1—Grout hose pipe and fittings 25 mm (1 in.) nominal.
FIG. 3 Typical Grouting Apparatus
8. Sampling
8.1 Coarse aggregat
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