ASTM C349-97
(Test Method)Standard Test Method for Compressive Strength of Hydraulic-Cement Mortars (Using Portions of Prisms Broken in Flexure)
Standard Test Method for Compressive Strength of Hydraulic-Cement Mortars (Using Portions of Prisms Broken in Flexure)
SCOPE
1.1 This test method covers the determination of the compressive strength of hydraulic-cement mortars, using for the test specimens portions of prisms made and broken in flexure in accordance with Test Method C 348.
1.2 The values stated in SI units are to be regarded as the standard. The values 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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
Designation: C 349 – 97
Standard Test Method for
Compressive Strength of Hydraulic-Cement Mortars
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(Using Portions of Prisms Broken in Flexure)
This standard is issued under the fixed designation C 349; 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 4. Apparatus
1.1 This test method covers the determination of the com- 4.1 Bearing Plates—The bearing plates shall be not less
pressive strength of hydraulic-cement mortars, using for the than 25 mm in thickness and shall be made of a hard metal. The
test specimens portions of prisms made and broken in flexure surfaces of the bearing plates that are placed in contact with the
in accordance with Test Method C 348. specimens shall be 40.0 6 0.1-mm by 50.8-mm rectangles,
1.2 The values stated in SI units are to be regarded as the with the 50.8-mm dimension at right angles to the longitudinal
standard. The values in parentheses are for information only. axis of the prism. The bearing plate surfaces in contact with the
1.3 Values in SI units shall be obtained by measurement in specimen shall have a Rockwell hardness of not less than 60
SI units or by appropriate conversion, using the Rules for HRC. These surfaces shall not depart from plane surfaces by
Conversion and rounding given in Standard IEEE/ASTM SI more than 0.01 mm when the plates are new and shall be
10, of measurements made in other units. maintained within a permissible variation of 0.03 mm.
1.4 This standard does not purport to address all of the 4.2 Device for Aligning Bearing Plates—A device for
safety concerns, if any, associated with its use. It is the aligning the bearing plates to ensure the proper location of the
responsibility of the user of this standard to establish appro- upper plate with reference to the lower plate is shown in Fig.
priate safety and health practices and determine the applica- 1. If the upper bearing plate does not have free movement
bility of regulatory limitations prior to use. within the aligning plates, these shall be separated from the
bottom plate by insertion of 0.05-mm shims on each side of the
2. Referenced Documents
bottom bearing plate, and the two 6-mm pins in the upper
2.1 ASTM Standards:
bearing plate filed down just sufficiently to permit free up and
C 109/C109M Test Method for Compressive Strength of down movement in the slots at the top of the aligning plates.
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube
4.3 Testing Machine—The testing machine shall conform to
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Specimens) the requirements prescribed in Test Method C 109, except that
C 348 Test Method for Flexural Strength of Hydraulic
the testing machine shall be of the hydraulic type.
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Cement Mortars
5. Test Specimens
C 670 Practice for Preparing Precision and Bias Statements
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for Test Methods for Construction Materials 5.1 Both portions from each prism broken in flexure shall be
IEEE/ASTM SI 10 Standard for Use of the International used for compression testing, except that the broken portions of
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System of Units (SI): The Modern Metric System prisms selected for the compression test shall have a length of
not less than 65 mm and shall be free of cracks, chipped
3. Significance and Use
surfaces, or other obvious defects.
3.1 This method provides a means of obtaining compressive
6. Procedure
strength values from the same specimens previously used for
flexural strength determinations by Test Method C 348. The 6.1 Determination of Compressive Strength—During the
compressive strength values are for reference purposes, and not interval between flexure tests of the prisms and testing the
as substitutes for values (using 50-mm (2-in.) cubes) obtained broken portions as modified cubes, cover the specimens for the
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by Test Method C 109/C 109M for cement acceptance. 24-h test with waterproof plastic and completely immerse all
other specimens in water at a temperature of 23 6 2.0°C (73 6
3°F) until the time of testing. Wipe the specimen to a
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This test method is under the jurisdiction of ASTM Committee C-1 on Cement
surface-dry condition, and remove any sand grains or incrus-
and is the direct responsibility of Subcommittee C01.27 on Strength.
tations from the faces that will be in contact with the bearing
Current edition approved May 10, 1997. Published June 1998. Originally
plates of the testing apparatus. Check these faces by applica-
published as C 349 – 54 T. Last previous edition C 349 – 95.
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Annual Book of ASTM Standards, Vol 04.01.
tion of a straightedge. If there is appreciable curvature, grind
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Annual Book of ASTM Standards, Vol 04.02.
the face or faces to plane surfaces or discard the specimen
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Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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