Young's modulus of concrete increases with hardening of the concrete at early ages. Young's modulus measured statically has been widely used to assess the variation of modulus with curing ages. However, this method is costly because the numerous test specimens are required. The dynamic testing technique has an advantage of performing the measurement nondestructively without breaking specimens. Furthermore, the perceived difference between static and dynamic moduli is becoming smaller due to the improvement of accuracy in the static measurement.
In this paper, the impact resonance method, which is a dynamic Young's modulus measurement technique, is briefly described. Dynamic Young's modulus of concrete of 28-day compressive strength ranging from 35 MPa to 65 MPa is evaluated at early ages by the impact resonance test. Based on the test results, it is found that the resonance frequency increases significantly even in the early curing age of concrete and the dynamic Young's modulus correlates quite well with early-age concrete strength, showing the possibility of using this dynamic testing technique in the evaluation of concrete strength.
Determination of dynamic Young's modulus of concrete at early ages by impact resonance test
KSCE J Civ Eng
KSCE Journal of Civil Engineering ; 1 , 1 ; 11-18
1997-12-01
8 pages
Article (Journal)
Electronic Resource
English
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