ASTM C234-91a
(Test Method)Standard Test Method for Comparing Concretes on the Basis of the Bond Developed with Reinforcing Steel (Withdrawn 2000)
Standard Test Method for Comparing Concretes on the Basis of the Bond Developed with Reinforcing Steel (Withdrawn 2000)
SCOPE
1.1 This test method covers comparison of concretes on the basis of the bond developed with reinforcing steel.
1.2 The values stated in inch-pound units are to be regarded as the standard.
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
Standards Content (Sample)
Designation: C 234 - 91a
AMERICAN SOCIETY FOR TESTING AND MATERIALS
ISTb 1918 RaceSt Philadelphia, Pa 19103
Reprinfed from the Annual Book of ASTM Standards. Copyright ASTM
If not listed in the current comblned index, will appear In the nexi edaion.
Standard Test Method for
Comparing Concretes on the Basis of the Bond Developed
with Reinforcing Steel'
This standard is issued under the fixed designation C 234; 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 (t) indicates an editorial change since the last revision or reapproval.
reinforcing bar or for establishing bond values for structural
1. Scope
design purposes. This test method is adaptable to use for
1.1 This test method covers comparison of concretes on
research purposes by varying the conditions as desired but no
the basis of the bond developed with reinforcing steel.
attempt to do so has been included in the method.
1.2 The values stated in inch-pound units are to be
3.2 This test method may also be used to determine the
regarded as the standard.
conformance of a product or a treatment with a requirement
1.3 This standard does not purport to address all of the
relating to its effect on the bond developed between concrete
safety problems, if any, associated with its use. li is the
and reinforcing steel.
responsibility of the user of this standard to establish appro-
priate safity and health practices and determine the applica-
4. Apparatus
bility of regulatory limitations prior to use.
4.1 Molds for Bond Test Specimens-Two types of molds
2. Referenced Documents
will be required: for 6411. or 150-mm concrete cubes each
containing a vertically embedded bar, and for 6 by 6 by
2.1 ASTM Standards:
12411. or 150 by 150 by 300-mm prisms each containing two
A370 Test Methods and Definitions for Mechanical
horizonfally embedded bars. The molds preferably shall be
Testing of Steel Products2
made of metal, not less than 9'4 in. (6 mm) thick. If made of
A 6 15 Specification for Deformed and Plain Billet-Steel
wood, they shall be lined with smooth sheet metal approxi-
Bars for Concrete Reinforcement3
mately '/8 in, (3 mm) thick. The molds shall be watertight.
C 39 Test Method for Compressive Strength of Cylindrical
With all-metal molds, watertightness may be accomplished
Concrete Specimens4
by using grooved joints, or a sealing compound may be
C 138 Test Method for Unit Weight, Yield, and Air
applied along the exteriors of the end joints after assembly.
Content (Gravimetric) of Concrete4
Particular care shall be taken to seal the openings where
C 143 Test Method for Slump of Portland Cement
reinforcing bars extend through the molds. The molds shall
Concrete4
be designed to hold the bars rigidly in place, including the
C 173 Test Method for Air Content of Freshly Mixed
free ends of projecting bars. The molds shall be constructed
Concrete by the Volumetric Method4
for easy removal without disturbance of embedded bars.
C 192 Practice for Making and Curing Concrete Test
Suitable molds are shown in Fig. 1.
Specimens in the Laboratory4
4.2 Measuring Apparatus-Apparatus shall be provided
C 231 Test Method for Air Content of Freshly Mixed
for measuring the movement of the reinforcing bar with
Concrete by the Pressure Method4
respect to the concrete at the loaded end of the bar. Dial
C 293 Test Method for Flexural Strength of -Concrete
gages shall be graduated in O.OOl-in, (0.025-mm) units; a
(Using Simple Beam with Center-Point L~ading)~
range of at least 0.5 in. (13 mm) shall be provided, and a
C 5 1 1 Specification for Moist Cabinets, Moist Rooms, and
range of 1.0 in. (25 mm) is desirable (Note i).
Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes415
NOTE 1-One type of apparatus that has been found satisfactory is
C 6 17 Practice for Capping Cylindrical Concrete Speci- shown in Fig. 2. The dial gages are mounted on suitable yokes which are
attached to the concrete specimen with setscrews. At the loaded end of
mens4
the bar, adjusfment is accomplished by changing the height of the cap
screws on the ends of the split-ring cross bar on which the stems of the
3. Significance and Use
cross bar is attached to the reinforcing bar
dial gages bear. The split-ring
3.1 This test method is not intended either for use in tests
through four screws in the arms of the cross bar which bring the gasket
in which the principal variable is the size or type of rubber lining into firm contact with the reinforcing bar. The three
setscrews as shown are used to ensure additional cross bar contact. The
cross bar is located in a slot machined in the intermediate bearing plate,
but is fastened to the reinforcing bar in such a way that no contact is
'This lest method is under the jurisdiction of ASTM Comm
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