Qty. Model, Description. 1, Choose One: HH, Humboldt concrete rebound hammer. H, Standard concrete test hammer, type n. HLM, Light. ASTM Cpdf – Download as PDF File .pdf), Text File .txt) or read online. Rebound Number of Hardened Concrete1 This standard is issued under the fixed designation C ; the number immediately following the designation.

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Historical Version s – view previous versions of standard. Summary of Test Method 3. The relationship shall be established over the range of concrete strength that is of interest. The user must exercise professional judgement when testing carbonated concrete.

If the rebound number if affected by the orientation of the instrument during testing, the strength relationship is applicable for the same orientation as used to obtain the correlation date see Note 3. Last previous edition C — Significance and Use 4. NOTE 2—Where formed surfaces were ground, increases in rebound number of 2. Estimate the rebound number on the scale to the nearest whole number and record the rebound number.

C — 97 Standard Test Method for Rebound Number of Hardened Concrete1 This standard is issued under the fixed designation C ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. We need your help to maintenance this website. Take ten readings from each test area. Therefore, tests should be made with the same instrument in order to compare results.

If more than 2 readings differ from the average by 6 units, discard the entire set of readings and detemine rebound numbers at 10 new locations within the test area.


To estimate strength in an existing structure, c05 the relationship by correlating rebound 5. We are a non-profit group that run this website to share documents. Size px x x x x The spring-loaded hammer must travel with a consistent and reproducible velocity.

Examine the impression made on the surface after impact, and if the impact crushes or breaks through a near-surface air void disregard the reading and take another reading. To estimate strength during construction, establish the relationship by performing rebound number tests on molded specimens and measuring the strength of the same or companion astn specimens.

Note 2 — The use of molded test specimens to develop a correlation may not provide a reliable relationship because the surface texture and depth of carbonation of molded specimens are not usually representative of the in-place concrete. These factors need to be considered in preparing the strength relationship and interpreting test f805.

ASTM C805-97.pdf

The relationship shall be established for a given concrete mixture and given apparatus. Select test locations so that a wide range of rebound numbers in the structure is obtained. 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. Wstm published as C — 75 T. These factors need to be considered in interpreting rebound numbers. We need your help!

ASTM C Standard

This specification has been approved for use by agencies of the Department of Defense. NOTE 1—Several types and sizes of rebound hammers are commercially available to accommodate testing of various sizes and types of concrete construction.

NOTE 4—Verification on an anvil will not guarantee that the hammer will yield repeatable data at other points on the scale. The rebound distance of the steel hammer from the steel plunger is measured on a asfm scale attached to the frame of the instrument.


Locations where strengths are to be estimated using the developed correlation shall have similar surface texture and shall have been exposed to similar conditions as the locations where correlation cores were taken. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability astj regulatory limitations prior to use. Data are not available on the relationship between awtm number and thickness of cabonated concrete.

Concrete should be tested only after it has thawed. An instrument guide is provided to center the rebound hammer over impact area and keep the instrument perpendicular to the surface. Gradually push the instrument toward the test surface until the hammer impacts.

The presence of surface carbonation can also result in higher rebound numbers. Smaller specimens must be rigidly supported. Link to Active This link will always route to the current Active version of the standard.

ASTM C, Test equipment Controls

Precision and Bias Referenced Documents purchase separately The documents listed below are astn within the subject standard but are not provided as part of the standard. Therefore, the range of ten readings should not exceed The form material against which the concrete was placed should be similar Note 2. Please help us to share our service with your friends.