UNIVERSITY OF SIEGEN

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

An efficient method to measure definite properties is the in-situ ultra-sonic wave measurement to characterize the hydration process of inorganic binding materials. A direct characterization of the chemical reactions taking place during the hydration process and the creation of the structure of the hydration product during the hydration is now possible because of the new interpretation technique of ultra-sonic results. In addition to the in-situ ultra-sonic wave measurements different other methods were used to verify the results of the ultra-sonic measurements.

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 gypsum stone created by the hydration of hemihydrate. The determination of technically relevant properties of modern, inorganic materials, e.g., workability, initial set, hydration progress and mechanical properties, involves the use of various time-consuming, conventional methods requiring substantial human-resource inputs. One efficient method of obtaining information on many such parameters...

Related articles:

Issue 1-2/2017 WO 2016/187242 A1

Method for analyzing cement integrity in casing strings ­using machine learning

(22) 18.05.2016 (43) 24.11.2016 (57) The present disclosure provides methods and systems for analyzing cement integrity in a depth interval of a wellbore having a multiple string casing with an...

more
Issue 09/2011

Improved operating efficiency and consistency

The MARTIN® Sonic Horn, a new addition to the family of flow aid products, is an acoustic cleaner that reduces system downtime, maintenance, and operating costs, while improving performance and...

more
Issue 7-8/2015 EP 2 886 794 A1

Systems and methods for cement evaluation calibration

(22) 23.12.2013 (43) 24.06.2015 (57) Devices and methods for calibrating acoustic cement evaluation data using an acoustic calibration device installed behind a casing in a wellbore are provided. Such...

more
Issue 5/2015 UNIVERSITY OF SIEGEN

Investigations of the hydration of calcium sulfate hemihydrate

1 Introduction Gypsum is one of the most used materials in the world; 119 million tons of natural gypsum were extracted worldwide in 2006 (MINERAL COMMODITY 2007). Additionally another...

more
Issue 7-8/2015 ULTRATEST

Ultrasonic measurement system revolutionizes ­cement and gypsum R & D

Currently, international standards (ASTM C191 – 13 //www.astm.org/Standards/C191.htm:www.astm.org/Standards/C191.htm:http://www.astm.org/Standards/C191.htm|_blank)$ or DIN EN 196-3) for the hardening...

more