ASTM C1040/C1040M − 08 Reapproved 2013 Standard Test Methods for In-Place Density of Unhardened and Hardened Concrete Including Roller Compacted Concrete By Nuclear Methods

ASTM C1040/C1040M − 08 Reapproved 2013 Standard Test Methods for In-Place Density of Unhardened and Hardened Concrete Including Roller Compacted Concrete By Nuclear Methods

Scope*
1.1 These test methods cover the determination of the in-place density of unhardened and hardened concrete, including roller compacted concrete, by gamma radiation. For notes on the nuclear test see Appendix X1.
1.2 Two test methods are described, as follows:
Section
Test Method A—Direct Transmission Test Method B—Backscatter
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1.3 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.

ASTM C1040/C1040M − 08 Reapproved 2013 Standard Test Methods for In-Place Density of Unhardened and Hardened Concrete Including Roller Compacted Concrete By Nuclear Methods

Significance and Use
3.1 These test methods are useful as rapid, nondestructive techniques for the in-place determination of the density of unhardened concrete. The backscatter test method is also useful for the same purpose on hardened concrete.

The fundamental assumptions inherent in the test methods are that Compton scattering is the dominant interaction and that the material under test is homogeneous.