Results 241 to 250 of about 125,940 (281)
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Evaluation of schmidt rebound hammer testing: A critical approach
Bulletin of Engineering Geology and the Environment, 1993In the present paper, a critical approach to the evaluation of Schmidt hammer testing is attempted. Through a statistical analysis of field measurements on sandstone blocks from the archaeological site of Delphi (Greece), it was shown that there is an inconsistency in the correction method proposed by the manufacturer, in relation to the direction of ...
E Kolaiti
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Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing [PDF]
Construction and Building Materials, 2019 peer reviewedThe main objective of this study was to estimate the compressive strength of recycled aggregate concrete (RAC) by means of Schmidt rebound hammer and core testing.
Jorge de Brito +2 more
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Testing of SFRC by the Schmidt Rebound Hammer
MRS Proceedings, 1990AbstractThe rebound number, its relationship to fundamental frequency and correlations with compressive strength and erosion - abrasion resistance are discussed. Nine mix proportions were used. The w/c ratios were varied from 0.30 to 0.65. The volumetric percentage of hooked steel fibres was varied from 0.25 to 2.0 vol.% at the w/c of 0.30; at the ...
Jakob Šušteršič +2 more
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Applying Support Vector Machines in Rebound Hammer Test
Advanced Materials Research, 2013There are several nondestructive testing techniques available to test the compressive strength of the concrete and the Rebound Hammer Test is among one of the fast and economical methods. Nevertheless, it is found that the prediction results from Rebound Hammer Test are not satisfying (over 20% mean absolute percentage error).
Yu Ren Wang +4 more
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An appreciation of the Schmidt rebound hammer
Magazine of Concrete Research, 1958Summary The Schmidt rebound hammer is described and some theoretical aspects underlying the functioning of the hammer are discussed and supported by some experimental results. The method of performing the test and its limitations under different conditions are described. Correlations with rate of wear of concrete and compressive strength on the basis
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Evaluation of Schmidt Hammer Rebound Hardness Test Holders
Geotechnical Testing Journal, 1984Abstract An evaluation is made of three different holders for Schmidt hammer tests on rock core in the laboratory, including steel angle, V-notch, and semicircular groove holders. The differences are small, but it is shown that the V-notch holder gives consistently higher rebound hardness values.
KL Gunsallus, FH Kulhawy, TD O'Rourke
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Earth and Space 2012, 2012
This paper discusses results of finite element investigation of two different mechanisms to drive a drilling instrument designed for lunar exploration. The instrument consists of a hollow tubular rod, one end of which rests upon the substrate to be drilled and the other end is actuated upon by a powered mechanism.
Ramesh B. Malla +2 more
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This paper discusses results of finite element investigation of two different mechanisms to drive a drilling instrument designed for lunar exploration. The instrument consists of a hollow tubular rod, one end of which rests upon the substrate to be drilled and the other end is actuated upon by a powered mechanism.
Ramesh B. Malla +2 more
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An Assessment of the Reliability of Rebound Hammer for Moist-Cured Specimens
2020 Advances in Science and Engineering Technology International Conferences (ASET), 2020This rebound hammer is a non-destructive concrete testing instrument. The instrument which measures the surface hardness of concrete is estimating the concrete compression strength by measuring the rebound number through a spring-loaded mass impacting against the concrete testing surface.
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Testing of concrete by rebound method: Leeb versus Schmidt hammers
Materials and Structures, 2018Hardness is considered as an important property of concrete; it can be used to estimate compressive strength of concrete in situ. The classic Schmidt rebound hammer is the most popular nondestructive method to measure concrete surface hardness, while the Leeb rebound hammer has been extensively studied in geological and metallographic fields over ...
Konstantin Kovler +2 more
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Clast transport history influences Schmidt hammer rebound values
Earth Surface Processes and Landforms, 2020AbstractThe Schmidt hammer (SH) is widely used in geomorphology for relative‐ and calibrated‐exposure age dating surfaces and deposits within landforms. This study employs a laboratory‐based methodology to assess the effects of surface roughness, clast roundness, and clast volume on SH rebound values (R‐values) by analyzing samples from three modern ...
Telemak Olsen +2 more
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