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...

Related articles:

Issue 2015-7-8 ULTRATEST

Ultrasonic measurement system revolutionizes ­cement and gypsum R & D

Currently, international standards (ASTM C191 – 13 //|_blank)$ or DIN EN 196-3) for the hardening...

Issue 2010-11

Removal of blockages

Standard Industrie has used the experience gained from over 30 years in the field of solving blockages and its capacity for constant innovation to create the AIRCHOC® Wireless (Fig.), an air cannon...

Issue 2009-10

Solving material hang up

At Knauf Drywall, Immingham/Großbrittanien (Fig.), problems of material hang up in silos and hoppers occurred within the plant. One such trouble spot was within a 6 m long twin screw discharge...

Issue 2018-11 HUE037124 (T2)

Gypsum plasterboard production plant and method for producing a gypsum plasterboard

(22) 26.06.2013 (43) 28.08.2018 (57) Summary of the corresponding patent WO2014206452 (A1): The invention relates to a gypsum plasterboard production plant, comprising at least one circulating...


Investigation of the influence of ­crystal ­morphology on the strength development of ­various a-hemihydrates by use of an in-situ ­ultrasonic technique and complementary methods

The hydration of calcium sulphate hemihydrate is a dynamic process composed of various chemical reaction steps that take place in parallel. These reaction steps influence the utility properties of the...