ASTM C1245-93
(Test Method)Standard Test Method for Determining Bond Strength Between Hardened Roller Compacted Concrete and Other Hardened Cementitious Mixtures Point Load Test
Standard Test Method for Determining Bond Strength Between Hardened Roller Compacted Concrete and Other Hardened Cementitious Mixtures Point Load Test
SCOPE
1.1 This test method is intended for testing roller-compacted concrete specimens and covers determination of the relative bond between layers of hardened concrete in multiple-lift forms of construction. It is applicable to all types of layered concrete construction involving an upper layer of concrete or mortar bonded to an underlying layer of concrete or mortar where the total depth is sufficient to meet the minimum specimen length and diameter requirements of this test method. Note 1-This test method does not provide tensile strength results of the material tested.
1.2 The values stated in inch-pound 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation: C 1245 – 93
Standard Test Method for
Determining Bond Strength Between Hardened Roller
Compacted Concrete and Other Hardened Cementitious
Mixtures (Point Load Test)
This standard is issued under the fixed designation C 1245; 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 Superficial Hardness of Metallic Materials
1.1 This test method is intended for testing roller-compacted
3. Significance and Use
concrete specimens and covers determination of the relative
3.1 Bond strength is determined using drilled cores or cast
bond between layers of hardened concrete in multiple-lift
cylindrical specimens in which the bond surface is essentially
forms of construction. It is applicable to all types of layered
normal to the longitudinal axis at approximately the mid-length
concrete construction involving an upper layer of concrete or
of the specimen. A splitting tensile stress normal to the bond
mortar bonded to an underlying layer of concrete or mortar
surface is produced by point-loading the specimen across a
where the total depth is sufficient to meet the minimum
diameter at that surface.
specimen length and diameter requirements of this test method.
NOTE 2—Test results are not affected significantly by specimen surfaces
NOTE 1—This test method does not provide tensile strength results of
obtained with normal coring operations. The ends of cores need not be
the material tested.
trimmed.
1.2 The values stated in inch-pound units are to be regarded
3.2 This test method may be used either for laboratory
as the standard. The values given in parentheses are for
investigation by casting individual composite cylinders or by
information only.
coring prototype structures or assemblies (Test Method C 42).
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
4.1 Testing Machine—The testing machine shall conform to
priate safety and health practices and determine the applica-
the requirements of Test Method C 39 and may be of any type
bility of regulatory limitations prior to use.
of sufficient capacity to provide the rate of loading prescribed
in 6.3.
2. Referenced Documents
4.2 Testing Apparatus—The testing apparatus shall be con-
2.1 ASTM Standards:
structed of steel and allow the testing of both 4 and 6-in. (101
C 39 Test Method for Compressive Strength of Cylindrical
and 152-mm) diameter specimens. The test schematic is given
Concrete Specimens
in Fig. 1. The testing apparatus shall permit the positioning of
C 42 Test Method for Obtaining and Testing Drilled Cores
a specimen such that the joint of the bonded surfaces is
and Sawed Beams of Concrete
oriented as closely as possible parallel to the direction of
C 192 Practice for Making and Curing Concrete Test Speci-
loading. A photograph of the test configuration is given in Fig.
mens in the Laboratory
2. Figures 3 through 10Figs. 3-10 provide the information
C 670 Practice for Preparing Precision and Bias Statements
necessary to construct alignment devices for 4 and 6-in. (101
for Test Methods for Construction Materials
and 152-mm) diameter specimens. Anvil rods (Fig. 4 and Fig.
C 1042 Test Method for Comparing Concrete on the Basis
6) shall have a hardness of not less than 55 HRC (Rockwell
of the Bond Developed with Reinforcing Steel
hardness number of 64 on the C scale) and shall be plane on the
E 18 Test Methods for Rockwell Hardness and Rockwell
bearing surfaces to within 6 0.001 in. (0.025 mm). The
alignment post shall ensure that the anvil rods are kept parallel
to each other in the vertical plane. The system is easily
This test method is under the jurisdiction of ASTM Committee C-9 on Concrete
adaptable to most testing machines.
and Concrete Aggregates and is the direct responsibility of Subcommittee C09.45 on
Roller Compacted Concrete.
Current edition approved Oct. 15, 1993. Published June 1994.
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C1245–93
(6.35 mm)) of the specimen. If the bond plane is not at mid-length of the
specimen, the section on each side of the bond plane shall be of a length
at least 0.6 the diameter. Where the bond surface is irregular or undulating,
a plane extending through and along the approximate average bearing of
the bond surface shall be marked on the specimen, and length measure-
ments shall be made from the line.
6.2 Positioning—Assemble and position the apparatus in
the testing machine. Place the specimen on the bottom platen
with the joint in contact with the anvil rods (see Fig. 2). The
longer anvil rods (Fig. 4a and Fig. 6b) and the longer alignment
post (Fig. 10) are used to test 6-in. (152-mm) diameter
specimens. The shorter anvil rods (Fig. 4 b and Fig. 6a) and the
shorter alignment post (Fig. 9) are used to test 4-in. (101-mm)
diameter specimens.
6.2.1 Then zero the load-indicating mechanism. Position the
specimen so that the bond surface is parallel to the upper and
lower anvil rods (see Fig. 2). This is best accomplished by
positioning the specimen by hand while gently bringing the top
anvil into contact with the specimen. Alternatively, the speci-
men may be supported with modeling clay or pieces of
polystyrene. Where the bond surface is irregular or undulating,
the line drawn to describe the average bearing of the bond
surface shall be used for orientation. The anvil rods shall
contact the bond surface at the contact point on the circumfer-
ence of the specimen.
6.3 Loading—Do not preload the specimen. Apply the load
NOTE 1—Test of parent concrete conducted with identical configura-
at a uniform rate of 150 to 200 psi/min (1 to 1.4 MPa/min) until
tion,
the specimen fails. Record the maximum load applied.
where:
f = tensile bond strength, psi (MPa),
tb 7. Calculation
P = maxim
...
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