Characterization of fresh and early age concrete using NDT

Abstract

The paper reviews a few methods which are suitable for the continuous measurement of the stiffening and hardening behavior of mortar and concrete. These are the dielectric method, the nuclear magnetic resonance method, the ultrasonic methods as wave-reflection method and wave-transmission method. The first two methods detect mainly the distribution of water in the sample as function of hardening time, while the other two methods rely on the development of the mechanical properties. The measurement principles are discussed and testing devices are described. © RILEM 2013.