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ASTM C805/C805M-08

Historical Revision

Standard Test Method for Rebound Number of Hardened Concrete

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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.

This test method is applicable to assess the in-place uniformity of concrete, to delineate regions in a structure of poorer quality or deteriorated concrete, and to estimate in-place strength.

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 mixture and given apparatus. Establish the relationship by correlating rebound numbers measured on the structure with the strengths of cores taken from corresponding locations. 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, moisture condition, and test cores in accordance with Test Method C 42/C 42M.

Note 1—See ACI 228.1R for additional information on developing the relationship and on using the relationship to estimate in-place strength.

For a given concrete mixture, the rebound number is affected by factors such as moisture content of the test surface, the method used to obtain the test surface (type of form material or type of finishing), vertical distance from the bottom of a concrete placement, and the depth of carbonation. These factors need to be considered in interpreting rebound numbers.

Different hammers of the same nominal design may give rebound numbers differing from 1 to 3 units. Therefore, tests should be made with the same hammer in order to compare results. If more than one hammer is to be used, perform tests on a range of typical concrete surfaces so as to determine the magnitude of the differences to be expected.

This test method is not suitable as the basis for acceptance or rejection of concrete.

SDO ASTM: ASTM International
Document Number C805
Publication Date Aug. 1, 2008
Language en - English
Page Count 3
Revision Level 08
Supercedes
Committee C09.64
Publish Date Document Id Type View
Dec. 15, 2018 C0805_C0805M-18 Revision
Dec. 15, 2013 C0805_C0805M-13A Revision
Jan. 1, 2013 C0805_C0805M-13 Revision
Aug. 1, 2008 C0805_C0805M-08 Revision