Is there a difference between “Static” and “Dynamic” moduli of concrete?

Abstract

Dynamic techniques have not found widespread use in measuring moduii of Portland cement concrete (PC0 because of uerceived differences between r&d& values measured statically and dynamically. This paper presents results from static and dynamic tests on PCC cylinders. These results show that there is no difference between Young’s modulus, E, determined dynamically and statically when measurements are made in the same strain range. However, longitudinal resonance tests, not direct travel-time measurements, must be used to evaluate E dynamically or else constrained modulus, not E, will be evaluated. It is also shown that the strain level used in static testing influences the value of E measured. Young’s modulus measured dynamically was found to be about 10% greater than the value measured in a conventional static test which is based on stress and strain at 40% of the failure stress.