{"title":"Calcium Silicate Bricks \u2013 Ultrasonic Pulse Method: Effects of Natural Frequency of Transducers on Measurement Results","authors":"Jiri Brozovsky","volume":93,"journal":"International Journal of Architectural and Environmental Engineering","pagesStart":971,"pagesEnd":975,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/9999379","abstract":"
Modulus of elasticity is one of the important
\r\nparameters of construction materials, which considerably influence
\r\ntheir deformation properties and which can also be determined by
\r\nmeans of non-destructive test methods like ultrasonic pulse method.
\r\nHowever, measurement results of ultrasonic pulse methods are
\r\ninfluenced by various factors, one of which is the natural frequency
\r\nof the transducers. The paper states knowledge about influence of
\r\nnatural frequency of the transducers (54; 82 and 150kHz) on
\r\nultrasonic pulse velocity and dynamic modulus of elasticity (Young's
\r\nDynamic modulus of elasticity). Differences between ultrasonic pulse
\r\nvelocity and dynamic modulus of elasticity were found with the same
\r\nsmallest dimension of test specimen in the direction of sounding and
\r\ndensity their value decreases as the natural frequency of transducers
\r\ngrew.<\/p>\r\n","references":"[1] Brozovsky, J. Bricks built in Masonry: Influence of Sounding\r\nTechniques and Moisture on Ultrasonic Pulse Velocity During\r\nParameter Determination. Wulfenia, 2013(5), p. 200-209. ISSN 1561-\r\n882X.\r\n[2] Brozovsky, J., Bydzovsky, J. Analysis of relations for determination of\r\nparameters of various types of concrete based on ultrasonic pulse\r\nmethod measurement, Advanced Materials Research, 2014(923), p. 99-\r\n107, ISSN 1022-6680.\r\n[3] Brozovsky, J., Dufka, A. To the problems of determination of dynamic\r\nelasticity modules of calcium silicate bricks by means of resonance\r\nmethod, Advanced Materials Research, 2014(897), p. 139-143, ISSN\r\n1022-6680.\r\n[4] Brozovsky, J.; Zach, J. Ultrasonic pulse method - the cement strength\r\nevaluation tool. Book of 2nd International conference on waste\r\nengineering management, Book Series: RILEM Proceedings (73), 2010,\r\np. 314-323. ISBN 978-2-35158-102-5.\r\n[5] Malhotra, V. N.; Carino, N .J. Handbook on nondestructive testing of\r\nconcrete. 2nd edition, USA: CRC Press, Switzerland, 2004.\r\n[6] Martin\u010dek, G.. Nondestructive dynamic testing methods of building\r\nmaterials and structures. Bratiskava:Vydavate\u013estvo Slovenskejakad\u00e9mie\r\nvied, 1962.\r\n[7] Nichols, J.M., Totoev, Y.Z. Experimental determination of the dynamic\r\nmodulus of elasticity of masonry units. The 15th Australian Conference\r\non the Mechanics of Structures and Materials, Melbourne 1997, p.1-10\r\n[8] Pande, G.N.,Liang, J.X., Middelton, J. Equivalent elastic moduli for\r\nbrick masonry. Computers and Geotechnics,1989(01), p.243-265. ISSN\r\n0266-352X.\r\n[9] Salaman, M.M, Al-Amawee, A.H.The ratio between static and dynamic\r\nmodulus of elasticity in normal and high strength concrete.Journal of\r\nEngineering and Development, 2006(2), p.163-174. ISSN 1813-7822\r\n[10] ASTM 597:2009. Standard Test Method for Pulse Velocity\r\nThroughConcrete. USA:American Society for Testing and Materials,\r\n2009.\r\n[11] CSN EN 12504-4:2002. Testing concrete - Part 4: Determination of\r\nultrasonic pulse method. Prague: Czech standards institute, 2002.\r\n[12] ISO 1920-7:2004. Testing of concrete - Part 7: Non-destructive tests on\r\nhardened concrete. International Organization for Standardization, 2004.\r\n[13] CSN 731371:2012. Non-destructive testing of concrete - Method of\r\nultrasonic pulse testing of concrete d. Prague: Czech standards institute,\r\n2012.\r\n[14] CSN 731372:2012. Testing Non-destructive testing of concrete - Testing\r\nof concrete by resonance method. Prague: Czech standards institute,\r\n2012.\r\n","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 93, 2014"}