ASTM C1006-07(2013)
(Test Method)Standard Test Method for Splitting Tensile Strength of Masonry Units
Standard Test Method for Splitting Tensile Strength of Masonry Units
SIGNIFICANCE AND USE
3.1 Masonry units alone and within assemblages commonly fail in a tensile mode when loaded in compression to failure. These tensile stresses result from differences in modulus of elasticity and Poisson's ratio between the masonry unit and mortar. Additionally, the dissimilarity in behavior of the grout within cores of masonry units under load leads to tensile stresses in the units and results in a splitting failure.
3.2 This test method produces a line load along the bed surface of the masonry unit. The compressive load applied to the unit, imposed by means of bearing rods, results in a tensile stress distributed over the height of the unit for the split length of the unit. This test method can be conducted with the rod oriented either in the longitudinal direction or in the transverse direction of the bed face. The splitting tensile strength is calculated by the equation given in 7.1.
3.3 The test value provides an indicator of masonry-unit splitting tensile strength. Additionally, the presence of defects such as visible voids or impurities in masonry units may be revealed.
SCOPE
1.1 This test method covers the determination of the splitting tensile strength of masonry units.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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.
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Standards Content (Sample)
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Designation: C1006 − 07 (Reapproved 2013)
Standard Test Method for
Splitting Tensile Strength of Masonry Units
This standard is issued under the fixed designation C1006; 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 3.3 The test value provides an indicator of masonry-unit
splitting tensile strength. Additionally, the presence of defects
1.1 This test method covers the determination of the split-
such as visible voids or impurities in masonry units may be
ting tensile strength of masonry units.
revealed.
1.2 The values stated in inch-pound units are to be regarded
4. Apparatus
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
4.1 Bearing Rods— Matched, paired steel bearing rods with
1 1
and are not considered standard.
diameters within ⁄8 to ⁄12 of the specimen height, of a length
greater than the length of the intended test area, and of
1.3 This standard does not purport to address all of the
straightness within 0.5 % of the specimen length shall be
safety concerns, if any, associated with its use. It is the
provided for each unit. Bearing rods that meet the straightness
responsibility of the user of this standard to establish appro-
requirement can be reused.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.2 Supplemental Bearing Bar or Plate—If the diameter or
largest dimension of the upper bearing face or lower bearing
2. Referenced Documents
block is less than the length of the specimen to be tested, a
2.1 ASTM Standards:
supplementary bearing bar or plate shall be used. The contact
E4 Practices for Force Verification of Testing Machines
surfaces of the bar or plate shall be machined to within 0.05 %
of planeness as measured on any line of contact of the bearing
3. Significance and Use
area. The bearing bar or plate shall have a width of at least 2
in. (51 mm), and a thickness not less than the distance from the
3.1 Masonry units alone and within assemblages commonly
edge of the spherical or rectangular bearing block to the end of
fail in a tensile mode when loaded in compression to failure.
the specimen. The bar or plate shall be used in such a manner
These tensile stresses result from differences in modulus of
that the load will be uniformly applied over the entire intended
elasticity and Poisson’s ratio between the masonry unit and
split length of the specimen.
mortar. Additionally, the dissimilarity in behavior of the grout
within cores of masonry units under load leads to tensile
4.3 Testing Machine:
stresses in the units and results in a splitting failure.
4.3.1 Thetestingmachineshallconformtotherequirements
of Practices E4, and may be of any type of sufficient capacity
3.2 This test method produces a line load along the bed
that will provide the rate of loading prescribed in 6.3.
surface of the masonry unit. The compressive load applied to
4.3.2 The upper, hardened metal bearing face shall be
the unit, imposed by means of bearing rods, results in a tensile
spherically seated and attached at the center of the upper head
stress distributed over the height of the unit for the split length
of the machine. The center of the sphere shall lie at the center
of the unit. This test method can be conducted with the rod
of the surface of the plate in contact with the specimen. The
oriented either in the longitudinal direction or in the transverse
bearing plate shall be closely held in its spherical seat but shall
direction of the bed face. The splitting tensile strength is
be free to turn in any direction; its perimeter at the ball face
calculated by the equation given in 7.1.
shall have at least ⁄4 in. (6.4 mm) clearance from the head of
the machine to allow for specimens whose test surfaces are not
This test method is under the jurisdiction of ASTM Committee C15 on
exactly parallel. The diameter of the bearing surface shall be at
Manufactured Masonry Units and is the direct responsibility of Subcommittee
least 5 in. (127 mm). The bearing block surfaces that will
C15.04 on Research.
contact the bearing bar or plate shall not depart from plane
Current edition approved June 1, 2013. Published June 2013. Originally
approved in 1984. Last previous edition approved in 2007 as C1006 – 07. DOI:
surfaces by more than 0.05 %.
10.1520/C1006-07R13.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5. Sampling
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 Selection—For the purpose of this test, full-size ma-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sonry units shall be selected at random by the purchaser or by
*A Summary of Changes section appears at the end of this standard
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C1006 − 07 (2013)
NOTE 2—Alternative methods of applying the line load to the specimen
have been used. Wood strips, metal bars of square cross section, and half
rounds have been utilized. Such devices, meeting the dimensional
requirements of 4.1, are permitted on specimens greater than 4 in. (102
mm) in height. The user of any modification should provide comparative
data, testing both ways, to validate the alternative method.
6.2 Test Alignment— Align the rods with the centerline of
the plates, and center the rods in the transverse direction.
Support the specimen on compressible rods or tubes that are
⁄16 in. (1.6 mm) smaller in diameter than the bear
...
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