ASTM C805/C805M-13a
(Test Method)Standard Test Method for Rebound Number of Hardened Concrete
Standard Test Method for Rebound Number of Hardened Concrete
SIGNIFICANCE AND USE
5.1 This test method is applicable to assess the in-place uniformity of concrete, to delineate variations in concrete quality throughout a structure, and to estimate in-place strength if a correlation is developed in accordance with 5.4.
5.2 For a given concrete mixture, the rebound number is affected by factors such as moisture content of the test surface, the type of form material or type of finishing used in construction of the surface to be tested, vertical distance from the bottom of a concrete placement, and the depth of carbonation. These factors need to be considered in interpreting rebound numbers.
5.3 Different instruments of the same nominal design may give rebound numbers differing from 1 to 3 units. Therefore, tests should be made with the same instrument in order to compare results. If more than one instrument is to be used, perform comparative tests on a range of typical concrete surfaces so as to determine the magnitude of the differences to be expected in the readings of different instruments.
5.4 Relationships between rebound number and concrete strength that are provided by instrument manufacturers shall be used only to provide indications of relative concrete strength at different locations in a structure. To use this test method to estimate strength, it is necessary to establish a relationship between strength and rebound number for a given concrete and given apparatus (see Note 1). Establish the relationship by correlating rebound numbers measured on the structure with the measured strengths of cores taken from corresponding locations (see Note 2). At least two replicate cores shall be taken from at least six locations with different rebound numbers. Select test locations so that a wide range of rebound numbers in the structure is obtained. Obtain, prepare, and test cores in accordance with Test Method C42/C42M. If the rebound number if affected by the orientation of the instrument during testing, the strength relationship is applicabl...
SCOPE
1.1 This test method covers the determination of a rebound number of hardened concrete using a spring-driven steel hammer.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with 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.
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Designation: C805/C805M − 13a
Standard Test Method for
1
Rebound Number of Hardened Concrete
This standard is issued under the fixed designation C805/C805M; 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* Either the distance that the hammer rebounds is measured or
the hammer speeds before and after impact are measured. The
1.1 This test method covers the determination of a rebound
test result is reported as a dimensionless rebound number.
number of hardened concrete using a spring-driven steel
hammer.
5. Significance and Use
1.2 The values stated in either SI units or inch-pound units
5.1 This test method is applicable to assess the in-place
are to be regarded separately as standard. The values stated in
uniformity of concrete, to delineate variations in concrete
each system may not be exact equivalents; therefore, each
qualitythroughoutastructure,andtoestimatein-placestrength
system shall be used independently of the other. Combining
if a correlation is developed in accordance with 5.4.
values from the two systems may result in non-conformance
with the standard. 5.2 For a given concrete mixture, the rebound number is
affected by factors such as moisture content of the test surface,
1.3 This standard does not purport to address all of the
the type of form material or type of finishing used in construc-
safety concerns, if any, associated with its use. It is the
tion of the surface to be tested, vertical distance from the
responsibility of the user of this standard to establish appro-
bottom of a concrete placement, and the depth of carbonation.
priate safety and health practices and determine the applica-
These factors need to be considered in interpreting rebound
bility of regulatory limitations prior to use.
numbers.
2. Referenced Documents
5.3 Different instruments of the same nominal design may
2
2.1 ASTM Standards:
give rebound numbers differing from 1 to 3 units. Therefore,
C42/C42M Test Method for Obtaining and Testing Drilled
tests should be made with the same instrument in order to
Cores and Sawed Beams of Concrete
compare results. If more than one instrument is to be used,
C125 Terminology Relating to Concrete and Concrete Ag-
perform comparative tests on a range of typical concrete
gregates
surfaces so as to determine the magnitude of the differences to
C670 Practice for Preparing Precision and Bias Statements
be expected in the readings of different instruments.
for Test Methods for Construction Materials
5.4 Relationships between rebound number and concrete
E18 Test Methods for Rockwell Hardness of Metallic Ma-
strengththatareprovidedbyinstrumentmanufacturersshallbe
terials
used only to provide indications of relative concrete strength at
3. Terminology
different locations in a structure. To use this test method to
estimate strength, it is necessary to establish a relationship
3.1 Definitions:
between strength and rebound number for a given concrete and
3.1.1 For definitions of terms used in this test method, refer
given apparatus (see Note 1). Establish the relationship by
to Terminology C125.
correlating rebound numbers measured on the structure with
4. Summary of Test Method
the measured strengths of cores taken from corresponding
4.1 A steel hammer impacts, with a predetermined amount locations (see Note 2). At least two replicate cores shall be
of energy, a metal plunger in contact with a concrete surface.
taken from at least six locations with different rebound
numbers. Select test locations so that a wide range of rebound
1
This test method is under the jurisdiction of ASTM Committee C09 on
numbers in the structure is obtained. Obtain, prepare, and test
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
cores in accordance with Test Method C42/C42M.Ifthe
C09.64 on Nondestructive and In-Place Testing.
rebound number if affected by the orientation of the instrument
Current edition approved Dec. 15, 2013. Published January 2014. Originally
during testing, the strength relationship is applicable for the
approved in 1975. Last previous edition approved in 2013 as C805 – 13. DOI:
10.1520/C0805_C0805M-13a.
same orientation as used to obtain the correlation date (see
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Note 3). Locations where strengths are to be estimated using
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
thedevelopedcorrelationshallhavesimilarsurfacetextureand
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. shall have been exposed to
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C805/C805M − 13 C805/C805M − 13a
Standard Test Method for
1
Rebound Number of Hardened Concrete
This standard is issued under the fixed designation C805/C805M; 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 test method covers the determination of a rebound number of hardened concrete using a spring-driven steel hammer.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C125 Terminology Relating to Concrete and Concrete Aggregates
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C125.
4. Summary of Test Method
4.1 A steel hammer impacts, with a predetermined amount of energy, a steelmetal plunger in contact with a surface of concrete,
and concrete surface. Either the distance that the hammer rebounds is measured.measured or the hammer speeds before and after
impact are measured. The test result is reported as a dimensionless rebound number.
5. Significance and Use
5.1 This test method is applicable to assess the in-place uniformity of concrete, to delineate variations in concrete quality
throughout a structure, and to estimate in-place strength if a correlation is developed in accordance with 5.4.
5.2 For a given concrete mixture, the rebound number is affected by factors such as moisture content of the test surface, the type
of form material or type of finishing used in construction of the surface to be tested, vertical distance from the bottom of a concrete
placement, and the depth of carbonation. These factors need to be considered in interpreting rebound numbers.
5.3 Different instruments of the same nominal design may give rebound numbers differing from 1 to 3 units. Therefore, tests
should be made with the same instrument in order to compare results. If more than one instrument is to be used, perform
comparative tests on a range of typical concrete surfaces so as to determine the magnitude of the differences to be expected in the
readings of different instruments.
1
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.64 on
Nondestructive and In-Place Testing.
Current edition approved Jan. 1, 2013Dec. 15, 2013. Published January 2013January 2014. Originally approved in 1975. Last previous edition approved in 20082013 as
C805 – 08.C805 – 13. DOI: 10.1520/C0805_C0805M-13.10.1520/C0805_C0805M-13a.
2
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
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C805/C805M − 13a
5.4 Relationships between rebound number and concrete strength that are provided by instrument manufacturers shall be used
only to provide indications of relative concrete strength at different locations in a structure. To use this test method to estimate
strength, it is necessary to establish a relationship between strength and rebound number for a given concrete and given apparatus
(see Note 1). Establish the relationship by correlating rebound numbers measured on the structure with the measured strengths of
c
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