The values stated in each system may not be exact equivalents. Complete document standard test method for rebound number of hardened concrete. Types of rebound hammers several hundred thousands of schmidt rebound hammers are in uses worldwide baumann, 2006. Besides, the test is relative simple, economical and versatile compared to.
Astm c805 c805m 18 standard test method for rebound. The rebound hammer strength test, being a nondestructive test, has its advantages of preserving integrity of sample. Sep 16, 2014 the rebound hammer test is described in astm c805 4 and bs 1881. Concrete rebound hammer calibration anvil concrete rebound hammer calibration anvil. Astm c805 c805m 08 standard test method for rebound. Standard test method for rebound number of hardened concrete. Astm c805c805m standard test method for rebound number. A number in parentheses indicates the year of last. The hm75 schmidt concrete rebound test hammer provides rapid nondestructive estimates of inplace concrete strength and is a valuable tool when assessing the need for further testing. Astm c805c805m standard test method for rebound number of. Standard test method for rebound number of hardened concrete1. Acceptability of rebound hammer test is evaluated by different research works and studies. Astm c805c805m18 standard test method for rebound number. Rebound hammer test on concrete principle, procedure.
Purchase your copy of astm c805c805m 18 as a pdf download or hard copy directly from the official bsi shop. The device used in the test known as schmidt hammer or rebound hammer, uses a spring and measures the hardness of concrete surface using the rebound principle 2. Rebound hammer test is a nondestructive testing method of concrete which provide a convenient and rapid indication of the compressive strength of the concrete. Nowadays, the schmidt rebound hammer is still the surface hardness testing device of. Standard method of test for standard method for rebound number of hardened concrete. As of now, we are able to fulfill orders but we will keep you posted as the situation evolves. Astm c805 standard test method for rebound number of hardened concrete. We also use the rebound hammer test to check out the uniformity and quality of the concrete surface. The original schmidt is fully compliant with all major standards.
Standard test method for rebound number of hardened. The rebound number may be used to assess the uniformity of concrete in situ and to delineate areas of poor quality or deteriorated concrete. If the rebound number is affected by the orientation of the instrument during testing, the strength relationship is applicable for the same orientation as used to obtain the. Isodis 8045 en 12 5042 env 206 din 1048 part 2 astm c805 astm d5873 nfp 18417 b 15225 jgjt 232001 jjg 8171993. Rebound hammer test 10 types of factors which effect it. Concrete rebound hammer calibration anvil humboldt mfg. Astm c805 standard test for re bound num bers of hardened concrete, provides some standard procedures so that t he user can have consistency when using the rebound hammer. This test is also known as the schmidt hammer or impact hammer, and is a non destructive method of. Data collection and processing of test results comply with industry standards such as astm c805 en 125042 bs 1881 part 202 din 1048, part 2 a 83. Application of rebound hammer method for estimating. Pdf standard test method for rebound number of hardened. The test is classified as a hardness test and is based on the principle that the rebound of an elastic mass depends on the hardness of the surface against which the mass impinges.
C805c805m 08 standard test method for rebound number of hardened concrete1 this standard is issued under the. Pdf application of rebound hammer method for estimating. These factors need to be considered in interpreting rebound numbers. Astm c 80585, test for rebound number of hardened concrete. Reading your results make at least ten readings from a concrete surface and discard the highest and lowest rebound numbers. The energy absorbed by the concrete is related to its strength 6.
C 805 02 standard test method for rebound number of. Purchase your copy of astm c805 c805m 18 as a pdf download or hard copy directly from the official bsi shop. All bsi british standards available online in electronic and print formats. Review of the rebound hammer method estimating concrete. C 805 97 standard test method for rebound number of hardened concrete 1 this standard is issued under the fixed designation c 805. The rebound hammer is also called as schmidt hammer that consist of a spring controlled mass that slides on a plunger within a tubular housing. Astm c805, standard test method for rebound number of hardened concrete. Rebound hammer testing schmidt hammer set of 10 readings astm c805, standard test method for rebound number of hardened concrete. The astm standard also states that the locations where it is intended to. C805c805m 08 standard test method for rebound number of hardened concrete, concrete, inplace strength, nondestructive testing, rebound hammer, rebound number, drive weight hammer kinetic energy, nondestructive evaluation ndeconcretemasonry, rebound, springdriven steel hammer. C805 c805m18 standard test method for rebound number of hardened concrete rebound number insulating boards springdriven steel hammers. Proper use of the rebound hammer updated to reflect the. Manual rebound hammers for compressive strength of.
To perform the rebound hammer test, the hammer must be perpendicular to a smooth and clean concrete surface. Astm c805c805m 18 standard test method for rebound number of hardened concrete. Astm c1437 f low of h yd raulic cement mo r ta r astm c 1437 tim boyer cm 442 p re l ab pu rpose the. This test method is not suitable as the basis for acceptance or rejection of concrete. Rebound hammer determination of compressie strength of hardened concrete c 805. Astm c805 requires a minimum of two cores obtained from at least six locations with different rebound numbers. Around each point of observation, six readings of rebound indices are taken and average of these. C805 c805m18 standard test method for rebound number of hardened concrete rebound number insulating boards. Scribd is the worlds largest social reading and publishing site. If the specimens are wet cured, they should be removed from wet storage and kept in the laboratory. Astmc805 standard test method for rebound number of. C 805 02 umnilattomal standard test method for rebound number of hardened concrete1.
Obtain, prepare, and test cores in accordance with test method c42c42m. Astm c805, standard test method for rebound number of. Precision and bias see astm c 805 precision and bias. The rebound 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. Dec 10, 2016 amazing concrete garden boxes part 1 diy forms to pour and cast cement planter link together beds duration. Astm c805 c805m 18 standard test method for rebound number of hardened concrete. The original schmidt is the classic for the basic testing for concrete and. Testing instruments pdf, 640 kb sales flyer schmidt hammers pdf, 314 kb. Concrete inspection rebound hammer elcometer 181 analogue concrete test hammer standards. Download standard test method for rebound number of.
In some cases, it would be hard to satisfy this condition. Estimating the strength of concrete using surface rebound. The manual concrete test hammer, aka rebound hammer, schmidt hammer, swiss hammer, sclerometer, is the most widely used non destructive instrument for compressive strength determination. Concrete rebound hammer calibration anvil concrete rebound hammer calibration anvil we are closely monitoring the changing situation with the covid19 virus outbreak. The chinese standard been applied in silverschmidt for the procedure to determine the rebound number. This fop is based on astm c 805 and has been modified per wsdot standards. This standard is issued under the fixed designation c 805. Amazing concrete garden boxes part 1 diy forms to pour and cast cement planter link together beds duration. All concrete test hammers measure the surface hardness of the material they are testing. The test locations should be selected so that a wide range of rebound numbers is obtained. Rebound hammer testing schmidt hammer set of 10 readings astm c805, standard test method for rebound number of hardened concrete concrete cube coring drilling. The same restriction applies to the pulse velocity method per astm.
Astm c805, standard test method for rebound number of hardened concrete, summarizes the procedure as a steel hammer impacts. This test is very simple and easy to run and is specified by astm c805. C805 c805m 08 standard test method for rebound number of hardened concrete, concrete, inplace strength, nondestructive testing, rebound hammer, rebound number, drive weight hammer kinetic energy, nondestructive evaluation ndeconcretemasonry, rebound, springdriven steel hammer. Astm c805c805m 18 standard test method for rebound. Standard method of test for penetration resistance of hardened concrete. Select test locations so that a wide range of rebound numbers in the structure is obtained. If desired, take a few test readings before you complete your series of. The rebound hammer test is described in astm c805 4 and bs 1881. Each rebound hammer is built for a different purpose in or. Astm issued a tentative standard in 1975 tentative method of test for rebound number of hardened concrete astm c 805.
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. An instrument guide is provided to center the rebound hammer over the impact area and keep the instrument perpendicular to the surface. A number in parentheses indicates the year of last reapproval. Apr 16, 2019 we also use the rebound hammer test to check out the uniformity and quality of the concrete surface. The rebound hammer has been around since the late 1940s and today is a commonly. A testing anvil is used to check whether the rebound test mechanism is working correctly. Rebound hammer standards the silverschmidt is fully compliant with astm c805, en 125042 and en 791. Astm c805 c805m standard test method for rebound number of hardened concrete. The rebound hammer test is codified in astm c805 3 and csn en 125042 4. Rebound hammer test is conducted around all the points of observation on all accessible faces of the structural element.
C 805 97 standard test method for rebound number of hardened concrete1 this standard is issued under the fixed designation c. C 805 02 standard test method for rebound number of hardened concrete1 this standard is issued under the. This standard is issued under the fixed designation c805c805m. Active standard astm c805 c805m developed by subcommittee. Aij, architectural institute of japan, nondestructive test manual of methods for. Concrete surfaces are thoroughly cleaned before taking any measurement. Standard method of test for length change of hardened hydrauliccement mortar and concrete. This test method covers the determination of a rebound number of hardened concrete using a springdriven steel hammer. Nondestructive testing of concrete by rebound hammer.
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