Bauhaus-Universität Weimar

Additive-dependent effects on plaster hydration

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The purpose of this work was to illuminate the effects of certain additives or of combined additives on a hydrating gypsum plaster. The changes in hydration and the strength development process are described in particular.

1 Introduction

Among calcium sulphate binders, building plasters in particular, plaster of Paris, or gypsum plaster, is the most well-known and often used. Plaster of Paris is a partially calcined product of raw gypsum (CaS0₄ · 2 H₂O) resulting from exposure to temperatures of 120-180 °C in a firing system. In comparison with other calcium sulphate binders, plaster of Paris is relatively inexpensive to produce and is therefore turned out at high tonnage rates. The main constituent of plaster of Paris is calcium sulphate hemihydrate (CaS0₄ · 0.5 H₂O [HH]) in its β form. β-HH has a...

TEXT Tabea von Bronk M.Sc., Dr.-Ing. Hans-Bertram Fischer, Bauhaus-Universität Weimar, F.A. Finger Institute for Building Material Engineering, Weimar/Germany

Issue 07/2024 MATERIALS RESEARCH AND TESTING INSTITUTE (MFPA) WEIMAR

Gypsum plaster made from recycled gypsum

The utilisation of recycled gypsum is becoming even more important with the upcoming loss of FGD gypsum. While RC gypsum (mainly from recycled gypsum plasterboard) is already being used in some cases for plasterboard, its use for other gypsum products is almost unresearched. Research results on a RC gypsum plaster will be presented.

Issue 5/2021 MENDELEEV UNIVERSITY OF CHEMICAL TECHNOLOGY | BAUHAUS-UNIVERSITÄT WEIMAR