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The Schmidt hammer in rock material characterization
Engineering Geology, 2005The Schmidt hammer provides a quick and inexpensive measure of surface hardness that is widely used for estimating the mechanical properties of rock material. However, a number of issues such as hammer type, normalization of rebound values, specimen dimensions, surface smoothness, weathering and moisture content, and testing, data reduction and ...
A. Aydin, A. Basu
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The schmidt hammer, weathering and rock surface roughness
Earth Surface Processes and Landforms, 1991AbstractMeasures of the differential relief of adjacent feldspar and pyroxene grains provide the first clear negative correlation of Schmidt hammer rebound (R‐) values and degree of weathering. However, weathering and roughness are intimately related, so the latter cannot be seen simply as a source of error limiting the utility of the Schmidt hammer ...
Danny Mccarroll
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Making the Schmidt Hammer Great Again!
2022<p>Have you ever applied the Schmidt hammer method and wondered what the R&#8209;value represents? What SI unit it would have and which material properties it actually assesses? The Schmidt rebound hammer is a device initially intended to test the curing state and strength of concrete.
Benjamin Huxol +4 more
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Developed Schmidt hammer based on jerk measurement
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XV, 2021The evaluation of hardened concrete quality became significantly important as a result of the continuous and increasing demand on concrete. Mechanical rebound hammer is a quick non-destructive evaluation method used to test the performance of hardened concrete onsite to assure the quality of newly casted concrete or asses the performance of old ...
Mostafa M. Geriesh +4 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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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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Rock abrasivity test with a modified schmidt hammer
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1982Ideally, an abrasivity test should be physically similar to the real cutting process of a drag bit or roller cutter and should generate a force of a few tonnes. The note describes how an m-type Schmidt hammer was modified and used as a portable in-situ tester.
W. Janach, A. Merminod
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Evaluation of schmidt rebound hammer testing: A critical approach
Bulletin of the International Association of Engineering Geology, 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, Z. Papadopoulos
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Hardness Testing of Polymer Concrete Castings by Schmidt Hammer
Materials Today: Proceedings, 2020Abstract Presented paper is focused on testing the hardness of polymer concrete castings by Schmidt hammer. The first part of the paper describes the theoretical knowledge from the material area of the issue. The experimental part of the paper is devoted to the production process of the polymer concrete castings and to the materials, machines and ...
ZAJAC Jozef +4 more
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