ASTM C215

Full Name

ASTM C215 – Standard Test Method for Fundamental Transverse, Longitudinal, and Torsional Resonant Frequencies of Concrete Specimens

Scope

ASTM C215 focuses on measuring the fundamental resonant frequencies of concrete specimens in three modes:

  1. Transverse resonance: vibration perpendicular to the longitudinal axis.
  2. Longitudinal Resonance: vibration parallel to the longitudinal axis.
  3. Torsional resonance: twisting vibration around the longitudinal axis.

The primary purpose of these measurements is to calculate the dynamic moduli of elasticity and rigidity, as well as Poisson’s ratio. This data is used to assess the elastic properties of concrete, which are critical for predicting its behavior under dynamic loading conditions, such as those caused by earthquakes or vibrations.

The standard applies to both cylindrical and prismatic concrete specimens. It outlines two methods for determining resonant frequencies:

  1. Forced resonance method: the specimen is vibrated by an electromechanical driver, and the response is monitored until maximum amplitude (resonance) is reached.
  2. Impact resonance method: the specimen is struck with a small impactor, and the response is measured using an accelerometer.

ASTM C215 is particularly useful for:

  • Monitoring changes: detecting changes in the dynamic modulus of elasticity of specimens exposed to weathering or other potentially deteriorating influences.
  • Maturity assessment: tracking the development of dynamic elastic modulus as concrete specimens mature.

However, it is important to note that this test method does not directly measure the strength of concrete. It primarily focuses on its elastic properties under dynamic loading.

ASTM C215 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C215 standard.

Contact us today to learn more about our testing capabilities and how we can support your business.

Resources

Keywords

resonant frequency; concrete specimen; dynamic modulus; elasticity; rigidity; Poisson’s ratio; transverse; longitudinal; torsional; vibration; forced resonance; impact resonance

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