MF INSTRUMENTS GmbH

Extended ultrasonic investigation of gypsum­ setting

Gypsum was studied from the time of mixing for more than forty-five days using the MFC ultrasonic analyser measuring system for characterisation of inorganic binder systems. The complete curing process was subdivided into eight time sectors.

1 Introduction

A measuring system for the characterisation of ­inorganic binder systems that uses the transmission method to measure the acoustic velocity of longitudinal waves in a specimen and the transmitted/received energy is described in [1]. The measuring cell consists of two brackets bearing the transmitter and receiver, and a specimen holder. In addition to the transmitter/receiver and the specimen, the acoustic path includes the contact chambers, which are filled with the couplant, and are separated from the specimen by a dividing film or layer. The transmitter is connected to the...

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