MATERIALS RESEARCH AND TESTING INSTITUTE (MFPA) WEIMAR

Gypsum plaster made from recycled gypsum

Platzhalter Materials Research and Testing Institute Weimar (MFPA)
1 Grain size composition according to laser granulometry of recycled gypsum from gypsum forms (F) and from plasterboard (M and Z) compared to the reference binder made of natural gypsum (Ref. PGB) Materials Research and Testing Institute Weimar (MFPA)
2 Grain size composition according to laser granulometry of the reference binders made of natural gypsum, the RC binders and RC Gypsums Materials Research and Testing Institute Weimar (MFPA)
3 Sieve analysis RC-Gypsum MUEG (RC-M) with grain classes 0-250 µm, 250-500 µm and > 500 µm; TOC value of the grain classes Materials Research and Testing Institute Weimar (MFPA)
4 Microscope image of cellulose fiber balls in RC binder and 5 Left: reference binder, right: RC-SG-M with swollen components Materials Research and Testing Institute Weimar (MFPA)
6 DTA and TG of RC Gypsum M (red) and RC-TA-M produced from it Materials Research and Testing Institute Weimar (MFPA)
7 Slump of gypsum mortar mixtures with increasing content of RC-MPG-M at W/F = 0.73 Materials Research and Testing Institute Weimar (MFPA)
8 Slump according to DIN EN EN13279-2 of gypsum mortars with different types of binders made from RC gypsum and ready-mixed dry mortar Materials Research and Testing Institute Weimar (MFPA)
9 Slump according to DIN EN EN13279-2 of gypsum mortars with different substitutions of RC-MPG-M compared to ready-mixed dry mortar (WTM) Materials Research and Testing Institute Weimar (MFPA)
10 Differential calorimetry (DCA) of hemihydrate binders (SG) made from natural gypsum and from various RC gypsums Materials Research and Testing Institute Weimar (MFPA)
11 Differential curves of mortar calorimetry of plasters with 32 % substitution with RC-SG-M and -Z compared to the reference Materials Research and Testing Institute Weimar (MFPA)
12 Heat rate of mortar calorimetry of plasters with RC-MPG* substitution of 0, 20, 50 and 100% compared to a standard formulation produced in the laboratory with reference binder (Ref. PGM); *laboratory-produced RC multi-phase gypsum binder Materials Research and Testing Institute Weimar (MFPA)
13 Microscope images of fracture surfaces 7 d hydrated gypsum mortar with different binders (a-c) Materials Research and Testing Institute Weimar (MFPA)
14 Overview of the measures taken in the project to achieve the required compressive strength of RC lightweight gypsum mortars Materials Research and Testing Institute Weimar (MFPA)

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.

1 Introduction

In recent years, extensive research projects on the recovery of gypsum from construction waste and industrial processes have been initiated in response to the announced coal phaseout and the resulting disappearance of FGD gypsum in Germany. In addition to the fundamental aim of conserving raw materials and resources, protecting the environment and climate, minimising landfill and converting to a more ecological industrial economy, the aim is to increase the recycling rate of gypsum while maintaining the same high raw material requirements [2] and to improve the general...

TEXT Saskia Nowak1, Aletta Böcker1, Heike Dreuse1, Tobias Crome2, Grit Losch2, Hilaria Schuler, Paul Malsch                          1MFPA Weimar/ Germany, 2CASEA, Ellrich/ Germany
This article appeared in

ZKG 07/2024

This article appeared in

ZKG 07/2024

Ressort:  Green Challenge
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