To the Problems of Determination of Dynamic Elasticity Modules of Calcium Silicate Bricks by Means of Resonance Method

Abstract:

Modulus of elasticity of building materials can be determined in a static way (loading in a press) or by means of non-destructive test methods (ultrasonic pulse method and resonance method); the parameter is most frequently determined for concrete and both methods of determining elasticity modulus are codified in Standards. Elasticity characteristics of calcium silicate bricks were determined by means of resonance test method. Because the shape of calcium silicate bricks (a block with oblong foot) is different from the shape of test specimens for concrete (usually blocks with square foot), expected frequencies for verification of accuracy of measurement by resonance method were determined. Moisture content of calcium silicate bricks (water absorbing capacity is up to 12-14%) has influence on the value of resonance frequency. Difference between dynamic Young's modulus of elasticity from fundamental longitudinal and transverse resonant frequency is on average 2.8%.

• Periodical: Advanced Materials Research (Volume 897)
• Pages: 139-143
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.897.139
• Online since: February 2014
• Authors: Jiří Brožovský*, Ámos Dufka
• Keywords: Calcium Silicate Bricks, Dynamic Modulus of Elasticty, Dynamic Poisson's Ratio, Fundamental Resonant Frequency, Moisture, Resonance Method

References

[1] ASTM C215-08 Standard Test Method for Fundamental Transverse, Longitudinal, and Torsional Frequencies of Concrete Specimens, ASTM International, United States, (2008).

DOI: 10.1520/c0215-02

[2] CSN 731322 Determination of frost resistance of concrete, Czech standards institute, Prague, (2007).

[3] CSN 731372 Non-destructive testing of concrete - Testing of concrete by resonance method, (2012).

[4] CSN 731380 Testing the freeze-thaw resistance of concrete - Internal structural damage, Czech standards institute, Prague, (2007).

[5] CSN EN 12371 Natural stone test methods - Determination of frost resistance, Czech standards institute, Prague, (2010).

[6] CSN EN 14146 Natural stone test methods - Determination of the dynamic modulus of elasticity (by measuring the fundamental resonance frequency), Czech standards institute, Prague, (2005).

DOI: 10.3403/03027526