Vikasonic - Measuring the Early Setting and Hardening with Ultrasonic Waves
The early setting is usual measured with the penetrometer or the Vicat apparatus. This kind of measurement has some disadvantages. In the early sixties some researchers suggested to use the ultra­sonic transition time as method for measuring the setting of mortars or fresh concrete. In cooperation with a German dry mix company, Schleibinger developed a special ultrasonic unit with an integrated data-logger and a special designed setup for the mortar specimen.