Calcium Silicate Bricks – Ultrasonic Pulse Method: Effects of Natural Frequency of Transducers on Measurement Results

Modulus of elasticity is one of the important
parameters of construction materials, which considerably influence
their deformation properties and which can also be determined by
means of non-destructive test methods like ultrasonic pulse method.
However, measurement results of ultrasonic pulse methods are
influenced by various factors, one of which is the natural frequency
of the transducers. The paper states knowledge about influence of
natural frequency of the transducers (54; 82 and 150kHz) on
ultrasonic pulse velocity and dynamic modulus of elasticity (Young's
Dynamic modulus of elasticity). Differences between ultrasonic pulse
velocity and dynamic modulus of elasticity were found with the same
smallest dimension of test specimen in the direction of sounding and
density their value decreases as the natural frequency of transducers
grew.

• Jiri Brozovsky

• Calcium silicate brick
• ultrasonic pulse method
• ultrasonic pulse velocity
• dynamic modulus of elasticity.

[1] Brozovsky, J. Bricks built in Masonry: Influence of Sounding
Techniques and Moisture on Ultrasonic Pulse Velocity During
Parameter Determination. Wulfenia, 2013(5), p. 200-209. ISSN 1561-
882X.
[2] Brozovsky, J., Bydzovsky, J. Analysis of relations for determination of
parameters of various types of concrete based on ultrasonic pulse
method measurement, Advanced Materials Research, 2014(923), p. 99-
107, ISSN 1022-6680.
[3] Brozovsky, J., Dufka, A. To the problems of determination of dynamic
elasticity modules of calcium silicate bricks by means of resonance
method, Advanced Materials Research, 2014(897), p. 139-143, ISSN
1022-6680.
[4] Brozovsky, J.; Zach, J. Ultrasonic pulse method - the cement strength
evaluation tool. Book of 2nd International conference on waste
engineering management, Book Series: RILEM Proceedings (73), 2010,
p. 314-323. ISBN 978-2-35158-102-5.
[5] Malhotra, V. N.; Carino, N .J. Handbook on nondestructive testing of
concrete. 2nd edition, USA: CRC Press, Switzerland, 2004.
[6] Martinček, G.. Nondestructive dynamic testing methods of building
materials and structures. Bratiskava:Vydavateľstvo Slovenskejakadémie
vied, 1962.
[7] Nichols, J.M., Totoev, Y.Z. Experimental determination of the dynamic
modulus of elasticity of masonry units. The 15th Australian Conference
on the Mechanics of Structures and Materials, Melbourne 1997, p.1-10
[8] Pande, G.N.,Liang, J.X., Middelton, J. Equivalent elastic moduli for
brick masonry. Computers and Geotechnics,1989(01), p.243-265. ISSN
0266-352X.
[9] Salaman, M.M, Al-Amawee, A.H.The ratio between static and dynamic
modulus of elasticity in normal and high strength concrete.Journal of
Engineering and Development, 2006(2), p.163-174. ISSN 1813-7822
[10] ASTM 597:2009. Standard Test Method for Pulse Velocity
ThroughConcrete. USA:American Society for Testing and Materials,
2009.
[11] CSN EN 12504-4:2002. Testing concrete - Part 4: Determination of
ultrasonic pulse method. Prague: Czech standards institute, 2002.
[12] ISO 1920-7:2004. Testing of concrete - Part 7: Non-destructive tests on
hardened concrete. International Organization for Standardization, 2004.
[13] CSN 731371:2012. Non-destructive testing of concrete - Method of
ultrasonic pulse testing of concrete d. Prague: Czech standards institute,
2012.
[14] CSN 731372:2012. Testing Non-destructive testing of concrete - Testing
of concrete by resonance method. Prague: Czech standards institute,
2012.