6 Apr 1This FOP is based on ASTM C and has been modified per WSDOT standards. To view the redline modifications, contact the. WSDOT. ASTM Cpdf – Download as PDF File .pdf), Text File .txt) or read online. Qty. Model, Description. 1, Choose One: HH, Humboldt concrete rebound hammer. H, Standard concrete test hammer, type n. HLM, Light.

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At least two replicate cores shall be taken from at c05 six locations with different rebound numbers. Establish the astm c805 by correlating rebound numbers measured on the structure with the measured strengths of cores taken from corresponding locations see Note astm c805. Select test locations so that a wide range of rebound numbers in the structure is obtained.

ASTM C – 97 Standard Test Method for Rebound Number of Hardened Concrete NO_PDF

Note 1 — See ACI The functionality of the rebound hammer shall have been verified in accordance with 6. Historical Version s – view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within astm c805 subject standard but are not provided asgm part of the standard.

Therefore, tests should be made with the same instrument in astm c805 to compare results. If more astm c805 one instrument is to be used, perform comparative tests on a range astm c805 typical concrete surfaces so as to determine the magnitude of the differences to be expected in qstm readings of different instruments. Combining values from the two systems may result in non-conformance with the standard.

If the rebound number if affected by the orientation of astm c805 instrument during testing, the strength relationship is applicable for the same astm c805 as used to obtain the correlation date see Note 3. It is the responsibility of the user of this standard to establish appropriate safety and health c8805 and determine the applicability of regulatory limitations prior to use.

To use this test method to estimate strength, it is necessary to establish asgm relationship between strength and rebound number for a astm c805 concrete and given apparatus see Note 1.

Work Item s – proposed revisions of this standard.

The values stated in each system may not be exact astm c805 therefore, each system shall be used independently of the other. Note aetm — The use of correction factors to account for instrument orientation astm c805 reduce the reliability of strength estimates if the correlation is developed for a different orientation than used for testing.

astm c805 Link to Active This link will always route to the current Active version of the standard. Locations where strengths are to be estimated using the developed correlation shall have similar surface texture astm c805 shall have been exposed to similar conditions as the locations axtm correlation cores were taken. These factors need to be considered in interpreting rebound numbers.

Note 2 — The use of molded test astm c805 to develop a correlation may not provide a reliable relationship because the surface d805 and depth of carbonation of molded specimens are not usually representative of the in-place concrete.