ASTM C805/C805M-18
(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 is 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C805/C805M − 18
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.
3
1. Scope* 2.2 Other Standard:
BS EN 13791 Assessment of In-Situ Compressive Strength
1.1 This test method covers the determination of a rebound
in Structures and Pre-Cast Concrete Components
number of hardened concrete using a spring-driven steel
hammer.
3. Terminology
1.2 The values stated in either SI units or inch-pound units
3.1 Definitions:
are to be regarded separately as standard. The values stated in
3.1.1 For definitions of terms used in this test method, refer
each system may not be exact equivalents; therefore, each
to Terminology C125.
system shall be used independently of the other. Combining
4. Summary of Test Method
values from the two systems may result in non-conformance
with the standard.
4.1 A steel hammer impacts, with a predetermined amount
of energy, a metal plunger in contact with a concrete surface.
1.3 This standard does not purport to address all of the
Either the distance that the hammer rebounds is measured or
safety concerns, if any, associated with its use. It is the
the hammer speeds before and after impact are measured. The
responsibility of the user of this standard to establish appro-
test result is reported as a dimensionless rebound number.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.4 This international standard was developed in accor-
5.1 This test method is applicable to assess the in-place
dance with internationally recognized principles on standard-
uniformity of concrete, to delineate variations in concrete
ization established in the Decision on Principles for the
qualitythroughoutastructure,andtoestimatein-placestrength
Development of International Standards, Guides and Recom-
if a correlation is developed in accordance with 5.4.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.2 For a given concrete mixture, the rebound number is
affected by factors such as moisture content of the test surface,
2. Referenced Documents the type of form material or type of finishing used in construc-
2 tion of the surface to be tested, vertical distance from the
2.1 ASTM Standards:
bottom of a concrete placement, and the depth of carbonation.
C42/C42M Test Method for Obtaining and Testing Drilled
These factors need to be considered in interpreting rebound
Cores and Sawed Beams of Concrete
numbers.
C125 Terminology Relating to Concrete and Concrete Ag-
5.3 Different instruments of the same nominal design may
gregates
give rebound numbers differing from 1 to 3 units. Therefore,
C670 Practice for Preparing Precision and Bias Statements
tests should be made with the same instrument in order to
for Test Methods for Construction Materials
compare results. If more than one instrument is to be used,
E18 Test Methods for Rockwell Hardness of Metallic Ma-
terials 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
5.4 Relationships between rebound number and concrete
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
strengththatareprovidedbyinstrumentmanufacturersshallbe
C09.64 on Nondestructive and In-Place Testing.
used only to provide indications of relative concrete strength at
Current edition approved Dec. 15, 2018. Published February 2019. Originally
different locations in a structure. To use this test method to
approved in 1975. Last previous edition approved in 2013 as C805/C805M – 13a.
DOI: 10.1520/C0805_C0805M-18. estimate strength, it is necessary to establish a relationship
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr
...
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 − 13a C805/C805M − 18
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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
2.2 Other Standard:
BS EN 13791 Assessment of In-Situ Compressive Strength in Structures and Pre-Cast Concrete Components
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 metal plunger in contact with a concrete surface. Either
the distance that the hammer rebounds is 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.
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 Dec. 15, 2013Dec. 15, 2018. Published January 2014February 2019. Originally approved in 1975. Last previous edition approved in 2013 as
C805 – 13.C805/C805M – 13a. DOI: 10.1520/C0805_C0805M-13a.10.1520/C0805_C0805M-18.
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.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*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
1
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C805/C805M − 18
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
...
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