BAUHAUS-UNIVERSITÄT WEIMAR

Calcium sulfate composite
binders containing pozzolans for
use in planar products

The aim is to produce planar products based on calcium sulfate composite binders. In initial trials it was demonstrated that (up to five-times) higher strengths can be achieved with this mixed binder than with pure hemihydrate plaster mixes for the same water/binder ratio. The strength losses caused by moisture that are typical of calcium sulfate can, depending on the mix formulation, be significantly reduced so that they can be lowered to the same level as cementitious systems. The timing of expansions caused by ettringite can be controlled by suitable mix formulations so that they are completed within 7 days at the latest.

1 Motivation

The results described here were obtained during a ZIM research project with the partners Lindner AG, GiB Gesellschaft für innovative Bautechnologie mbH and the F.A. Finger Institute for Building Material Engineering at Bauhaus-Universität Weimar. This partnership is developing fibreboard based on special, energy-efficient, calcium sulfate composite binders.

This binder system consists of calcium sulfate binders that are capable of setting and have a low primary energy requirement with properties that can be sustainably improved by carefully controlled combinations with cement and...

Related articles:

Issue 2009-03 Materials Science

1 Introduction Calcium sulfate binders are required to have widely varying properties to meet technical and economic requirements. In particular, it has to be possible to vary the workability time and...

more
Issue 2021-2 VERBAND FÜR DÄMMSYSTEME, PUTZ UND MÖRTEL E.V. (VDPM – ASSOCIATION FOR INSULATION SYSTEMS, PLASTER AND MORTAR)

One outstanding property of calcium sulfate flowing screeds is that large floor screed areas can be laid with virtually no joints in a free-flow consistency that can be placed easily and by machine....

more
Issue 2020-11-12 KAZAN STATE UNIVERSITY OF ARCHITECTURE AND ENGINEERING

1 Introduction The main problem when mixing gypsum binder (GB) and Portland cement (PC) lies in enabling a stable structure to form during their co-hardening. Another important aspect is the problem...

more
Issue 2010-11

1 Hydration and hardening of gypsum-based plasters The hardening of gypsum building materials is based on the crystallization of calcium sulfate dihydrate from a solution that is supersaturated with...

more
Issue 2017-12 UA115381 (C2)

(22) 02.09.2014 (43) 25.10.2017 (57) The present invention relates to composite binders containing calcium sulfoaluminate cement and supplementary cementitious material, wherein a weight ratio of...

more