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FAIRS & EVENTS182 CPI %u2013 Concrete Plant International %u2013 3 | 2025 www.cpi-worldwide.comFor the 34th time, the conference %u201cRheological Measurements on Mineral Building Materials%u201d took place on February 19, 2025 at the Ostbayerische Technische Hochschule (OTH) in Regensburg, Germany. A practice-oriented workshop followed on February 20. The event was held in a hybrid format, allowing around 100 participants from 21 countries worldwide to follow the presentations.The conference was opened by the Vice President of the OTH, Prof. Oliver Steffens. Prof. Charlotte Thiel (OTH Regensburg) and Markus Greim (Schleibinger Ger%u00e4te GmbH) guided the participants through the varied program.Technical presentations on current research topicsThe first conference session dealt with fundamental aspects of rheology of building materials, with a focus on slump and slump flow measurements. Callum White (University of Cambridge, UK) presented current research results on the computer-aided evaluation of slump flow measurements and the rheological parameters that can be derived from it. To this end, an acceleration sensor was placed on the slump cone. Michael Autischer (Graz University of Technology, Austria) extended the scope of this topic and presented his investigations on slump flow measurements, which were evaluated with image processing techniques and compared with rheometer measurements.Olivia Rindle (Technical University of Munich, Germany) investigated the influence of different polycarboxylate-based superplasticizers on cement-based mortars. On the basis of slump flow measurements, the critical and saturation dosages were determined and their effects on the morphology of the ettringite formed were analysed.Rafaela de Kassia Rodrigues e Silva (Federal Center for Technological Education of Minas Gerais, Brazil) presented her research on geopolymer mixtures with different fillers and activators. The mixtures were characterized by rheological investigations and slump flow measurements and their suitability for 3D printing was discussed.Another important topic was the use of calcined clays to reduce the clinker content in cementitious mixtures. Axel Nei%u00dfer-Deiters (University of the Federal Armed Forces Munich, Germany) presented his investigations on the rheological properties of different calcined clays and the pore solution. In addition, the absorption behaviour of superplasticizers and calcium ions was analysed by means of zeta potential measurements.The characterization of accelerated mineral foams presents a challenge. Klemens Laub (IAB Weimar, Germany) developed a method for the rheological assessment of mineral foams, which examines and compares their composition and processing time at very low shear rates.In addition to these contributions, the conference offered other exciting presentations on current research topics.Workshop on 3D printing with cement-based mortarsOn the second day of the event, a workshop with a practical focus on the topic of %u201c3D printing%u201d took place. Prof. Charlotte Thiel%u2019s students %u2013 Merve Karamara and Sophie Albrecht %u2013 34th Conference and Workshop %u201cRheological Measurements on Mineral Building Materials%u201dEvent reviewA total of ten technical presentations were offered to the participants of the 34th conference and accompanying workshop on %u201cRheological Measurements on Mineral Building Materials%u201d. During the session breaks, a trade exhibition offered excellent opportunities for networking.