Ultrasonic Setting Measurements

Ultrasonic Datalogger

Manfactured by: Scheilbinger Gerate

Measuring the Early Setting and Hardening with the Schleibinger Ultrasonic Data logger

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 the German dry mix company Hasit, Schleibinger developed a special datalogger which controls up to 2 common ultrasonic puls indicators, like the well known Pundit 7 .

Measurement Principle

Fresh mortar is setting between two ultrasonic transducers, which are supplied with 1..10 pulses per second at a frequency of 54 kHz. The mortar changes, according to the setting, the ultrasonic transition time and the signal damping. From the beginning of first contact of the growing binder-stone, the ultrasonic sound speed increases. If there is a complete crystalline structure the change of the sound speed will be slower. Until a further aggregation of the cement stone it increases again.

Measurement Setup

Each measurement cell is supplied with a pair of ultrasonic transducers. A common Pundit 7 ultrasonic test instrument continuously measures the ultrasonic transition time. The data sets are sent digitally to the Schleibinger data-logger. This data-logger controls the Pundit7 and records the data on a non volatile memory. Two Pundit 7, and therefore to measurement cells may be connected to one Schleibinger data-logger. As an option you may also record temperature and humidity of the specimen or the environment.

The Schleibinger datalogger is an autonomous instrument, during the tests no PC is required. The data logger has a network interface (Ethernet), and may be integrated directly in your laboratory network. For setup and data upload, a browser software like the Internet Explorer or the Firefox is necessary, but no special software must be installed on your PC. Also a direct link from the logger to your PC is possible. The data plots may be displayed in your browser or may be directly imported into your Excel worksheet. The software was developed at Schleibinger and my be adapted to your special requirements

Additional Product Information:

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