MgO building material system - salt concrete - gypsum building material system
In connection with our expertise in the field of salt and mineral chemistry (hexary system of oceanic salts), our research is also focussed on three special building material systems: Magnesia building material, salt concrete and the gypsum building material system. Against the background of salt-resistant building materials, we are world leaders in the state of science and research on magnesia building materials. This includes modelling and calculating the stability of the binder phases under various boundary conditions.
Contact person
Selected publications
- Solid-liquid equilibria of Sorel phases and Mg(OH)2 in the system Na-Mg-Cl-OH-H2O. Part II: Pitzer modelling.
D. Freyer, M. Pannach, W. Voigt.
Frontiers in Nuclear Engineering 2:1236544 (2023) read online (open access) - Solid-liquid equilibria of Sorel phases and Mg(OH)2 in the system Na-Mg-Cl-OH-H2O. Part I: experimental determination of OH- and H+ equilibrium concentrations and solubility constants at 25°C, 40°C, and 60°C.
M. Pannach, I. Paschke, V. Metz, M. Altmaier, W. Voigt, D. Freyer.
Frontiers in Nuclear Engineering 2:1188789 (2023) read online (open access) - New results of the large-scale experiment with magnesia building material of formulation C3.
J. Aurich, M. Gruner, U. Glaubach, D. Freyer, I. Paschke, T. Popp, W. Kudla.
Mining 7, 308-316 (2021). - Magnesia building material (sorel cement) - from basics to application. In Cementitious materials. Composition, properties, application,
H. Pöllmann, 311-331 D. Freyer.
(deGruyter, 2017) read online - Hydrophobising of gypsum by silanes (Part 1).
A. Winkler, S. Fritz, T. Aberle, D. Freyer and W. Voigt.
ZKG International 66(7-8), 72-78 (2013) read online; (Part 2) ZKG International 66(9), 72-79 (2013) read online - Water channel structure of bassanite at high air humidity: Crystal structure of CaSO4-0.625H2O.
H. Schmidt, I. Paschke, D. Freyer and W. Voigt.
Acta Crystallographica Section B: Structural Science 67, 467-475 (2011) read online - 9Mg(OH)2-MgCl2-4H2O, a high temperature phase of the magnesia binder system.
R.E. Dinnebier, D. Freyer, S. Bette and M. Oestreich.
Inorganic Chemistry 49, 9770-9776 (2010) read online - Can mixtures of α- and β-hemihydrates be quantified by means of thermoanalysis?
D. Freyer and W. Voigt.
ZKG International 62, 47-53 (2009) read online - The effect of retarders on the setting process in industrially relevant hemihydrate gypsum plasters [On the effect of retarders on the setting process of technically relevant stucco plasters].
J. Schneider, D. Freyer and W. Voigt.
ZKG International 60, 68-76 (2007). - Crystallisation and phase stability of CaSO4 and CaSO4 - Based Salts.
D. Freyer and W. Voigt.
Monatshefte für Chemie - Chemical Monthly 134, 693-719 (2003) read online
FuE final reports
- MgO concrete C3 as a long-term resistant and fast-acting sealing element for shaft seals of future HAW repositories in Salinar (MgO-C3). Final report for the BMUV joint project - in progress.
- MgO-S³: MgO shotcrete for roadway seals for HAW repositories in rock salt. Final report on the R&D project (2023).
- MgO shotcrete: Behaviour under attack by MgCl2 solution ("MgO-SEAL") Final report on the R&D project (2020).
- Correlation of chemism and mechanical properties of the MgO building material.
D. Freyer, M. Gruner and T. Popp. Freiberger Forschungshefte E15 Naturwissenschaften (2015) or Final report on the R&D project (2015). - Shaft Closures for High-Level Radioactive Waste Repositories (ELSA - Phase 2): Concept development for shaft seals and testing of functional elements of shaft seals: Summary final report for the joint project (2021).
- Asse II mine: Proof of long-term stability for the Sorel construction material of recipe A1 (Report (2018) on behalf of the BGE).
- Development of a basic concept for long-term stable face dams in easily soluble salt rock (carnallitite) for UTD/ UTV, Part 2: Testing of functional elements.
Sub-report TB 5: TB 5.2: MgO building material - Investigations on the formation of Sorel phases and
Sub-report TB 8: TB 8.1: 3-zone prefill - Development, construction, testing and mode of action of the dam prefill element, BMBF funding code 02C1204
D. Freyer, W. Voigt - The targeted customisation of gypsum building materials using chemical additives.
D. Freyer, J. Schneider, W. Voigt.
AIF final report, 14178 BR (2007).
Scientific lectures, national - international
-Selection-
- M. Gruner: Large-scale tests - state of knowledge on the material properties of cement- and MgO-based sealing materials.
AKB-Workshop, Braunschweig 05-07 September 2023. - M. Pannach, D. Freyer: Magnesia building material - status of S&T - thermodynamic calculation of resistance in the host rock salt (status THEREDA).
AKB-Workshop, Braunschweig 05-07 September 2023. - I. Paschke, D. Freyer: Magnesia building material - Status of S&T - Building material formulations and their properties.
AKB-Workshop, Braunschweig 05-07 September 2023. - F. Häusler, D. Freyer: Solubility of CSH phases in NaCl-saturated solutions - vs. THEREDA (with stand CEMDATA18).
AKB-Workshop, Braunschweig 05-07 September 2023. - I. Paschke, D. Freyer, M. Gruner, T. Popp: Overview of MgO Cement/Concrete Types.
13th US/GERMAN WORKSHOP on Salt Repository Research, Design & Operation, Santa Fe, New Mexico, USA, 20-23 June 2023. - M. Pannach, I. Paschke, D. Freyer: Magnesia building material -Solubility data of Sorel phases and modelling in the oceanic salt system.
ABC-SALT VII, Santa Fe, New Mexico, USA, 15-16 June 2023. - D. Freyer, T. Popp: MgO shotcrete for engineered barrier systems in salt formations - in situ tests with inflow of MgCl2 bearing solution (R&D project MgO-SEAL).
10th US/GERMAN WORKSHOP on Salt Repository Research, Design & Operation, Rapid City, SD, USA, 28-30 May 2019. - D. Freyer:Use of magnesia mining material in salt mines - questions and new findings.
44th Geomechanics Colloquium, Leipzig 13 November 2015 - D. Freyer: Sorel building material in salt formations.
6th US/GERMAN WORKSHOP on Salt Repository Research, Design & Operation, Dresden, 07-09 September 2015. - D. Freyer: Laboratory investigations on the magnesia repository system - questions and procedures.
PTKA expert discussion, repository research - sealing systems - in-situ structures made of magnesia and its chemical-mechanical properties with regard to HAW repositories. Freiberg, 28-29 April 2015. - Paschke, D. Freyer: The recipe-related setting behaviour of the magnesia building material (phase formation).
Talks of the PTKA, Repository research - Closure systems - In-situ structures made of magnesia and its chemical-mechanical properties with regard to HAW repositories. Freiberg, 28.-29.04.2015. - D. Freyer, I. Paschke: The chemical-mechanical behaviour of magnesia repository formulations during and after secondary solution addition. Part 2 - chemical facts.
PTKA expert discussion, repository research - closure systems - in-situ structures made of magnesia and its chemical-mechanical properties with regard to HAW repositories. Freiberg, 28.-29.04.2015. - D. Freyer: The CaSO4-H2O system - An overview: From phase characteristics to application.
Weimar Plaster Conference, Weimar 26 March 2014. - D. Freyer: Magnesia building material - A new state of knowledge.
Annual Conference of the GDCh Construction Chemistry Section, Kassel, 6 - 8 October 2014. - D. Freyer: Hydrophobising of gypsum by silanes.
XV Anniversary International Scientific and Technical Conference "Modern Technologies of Dry Mixtures in Construction" Moscow, 26-28 November 2013. - D. Freyer: The Hydrate Water Content of Bassanite - dependence on Water Activity.
ISSP 15, Xining, China, July 2012. - A. Winkler, D. Freyer: On the effect of phosphonates on gypsum crystallisation.
Weimar Gypsum Conference, Weimar 30-31 March 2011. - D. Freyer: Questions of the stability of sorel-based building materials for sealing structures in contact with saline solutions.
Specialist discussion on sealing structures, BMBF/BMWi, Freiberg, 20-21 October 2009. - D. Freyer: Requirements for building materials in salinar: Binder phases of MgO building materials.
Annual Conference of the GDCh Construction Chemistry Section, Freiberg 8-9 October 2009. - D. Freyer: In situ RAMAN spectroscopy on the thermal behaviour of different CaSO4 - 0.5 H2O morphologies.
Conference GDCh-Fachgruppe Bauchemie, Koblenz, 22-24 September 2008. - D. Freyer: Confectioning of gypsum building materials using additives - on the effect of retarders.
ibausil, Weimar, 22. 09. 2006.
