The modulus of elasticity of concrete is used in the calculations of structural deformations.
BS 1881 is a British Standard series that discusses methods for testing of concrete. The main aim of the BS 1881 series is to provide best industry recommendation on tests to determine whether your concrete and concrete products are fit for purpose.
BS 1881-209 is the 209th part of the series that gives recommendations for the determination of dynamic modulus of elasticity of plain concrete in the laboratory using resonance of vibration in the longitudinal mode.
BS 1881-208 on the determination of dynamic modulus of elasticity of concrete is relevant to:
The dynamic modulus is used to determine the relative durability of concrete when exposed to severe climatic conditions as the dynamic modulus of concrete changes with the quality of concrete.
Testing of concrete by the measurement of dynamic modulus of elasticity is a laboratory technique and involves applying an alternating force of variable frequency to the end of a prismatic sample and recording the resonant frequency. The frequency at which this vibration occurs depends largely on the dynamic modulus of elasticity, density, and length of the specimen.
Thus, by accurately determining the dynamic modulus of elasticity of concrete with BS 1881-209-compliant methods, you can determine the quality of concrete, when it is subjected to alternate freezing and thawing.
Adopting BS 1881-209, can be particularly beneficial when it comes to material testing for quality control, to determine whether the materials can contribute to the overall concrete strength, durability and performance.