Kategorie: ‘Gels’
63rd “Aachener Baustofftag”
Prof. Weichold gave a lecture entitled “Cross-linked, highly alkaline hydrogels in maintenance” at the 63rd “Aachener Baustofftag” and BÜV advanced training for expert planners on November 14 and 15, 2024 in Aachen.
New publication:
Approaches to upscaling alkaline gels as particles
Highly alkaline hydrogels are becoming increasingly important in building materials research. We have been able to show repeatedly that cationic alkaline hydrogels based on diallyldimethylammonium hydroxide (DADMAOH) in particular can be used effectively to seal water-bearing cracks or as coupling media for electrochemical chloride extraction. Upscaling is a challenge, as commercial cation-selective membranes have proven to be less effective here. On the other hand, neutral gels and gel particles can be easily prepared from diallyldimethylammonium chloride (DADMAC) in large quantities and with a wide range of compositions. Here it is shown that these neutral gel particles can be converted into DADMAOH particles with residual halide contents of <0.3 % by means of inverse static anion exchange in NaOH solution. The physical and chemical properties of the alkaline particles correspond to those of the alkaline gels and fulfill all necessary requirements for building material applications, but are much easier to produce.
T. B. Mrohs, O.Weichold
A Simple Preparation of Crosslinked, Highly Alkaline Diallyldimethylammonium Hydroxide Hydrogel Particles via Inverse Static Anion Exchange
Gels 2024, 10, 743. https://doi.org/10.3390/gels10110743 (open access)
17th ICPIC conference papers reprinted
The articles on the presentations “Ionic Conductive Polyesters-Assessing the Risk of Corrosion in Steel-Reinforced Concrete” by Prof. Weichold and “Alkaline Hydrogels-Multifunctional Materials for Concrete Rehabilitation” by Tim Mrohs (see also entry from 19.9.2023) at the 17th International Congress on Polymer in Concrete (ICPIC 2023) in Warsaw, Poland, have now been published in print.
Weichold, O. (2025). Ionic Conductive Polyesters—Assessing the Risk of Corrosion in Steel-Reinforced Concrete. In: Czarnecki, L., Garbacz, A., Wang, R., Frigione, M., Aguiar, J.B. (eds) Concrete-Polymer Composites in Circular Economy. ICPIC 2023. Springer Proceedings in Materials, vol 61. Springer, Cham. https://doi.org/10.1007/978-3-031-72955-3_34
Mrohs, T., Jung, A., Weichold, O. (2025). Alkaline Hydrogels—Multifunctional Materials for Concrete Rehabilitation. In: Czarnecki, L., Garbacz, A., Wang, R., Frigione, M., Aguiar, J.B. (eds) Concrete-Polymer Composites in Circular Economy. ICPIC 2023. Springer Proceedings in Materials, vol 61. Springer, Cham. https://doi.org/10.1007/978-3-031-72955-3_37
WTA-Days 2024
We were represented with a total of four lectures at the WTA Days 2024, 14-16 March 2024 in Brno, Czech Republic.
Prof Weichold presented a lecture entitled ‘Alkaline hydrogels as multifunctional repair materials’. From the field of bio-based construction materials, Fabian Weitenhagen gave a presentation on ‘Renewable Polyester Resin Systems for Sustainable Construction Materials’, Paul Marten gave a presentation on ‘Chitosan as a Key Component in the Production of Sustainable Acrylic Glass-Wood Laminates’ and Nils Münstermann gave a presentation on ‘Chitosan as an Eco-Friendly Binder for High-Strength Fibreboards in Sustainable Construction’.
62nd DAfStb Research Colloquium
Prof Weichold gave a lecture entitled ‘Highly alkaline hydrogels – the Swiss army knife of repair’ at the 62nd Research Colloquium of the German Committee for Reinforced Concrete, also the 10th Annual Conference, 26-27 September 2023 in Aachen.
17th ICPIC
Tim Mrohs was awarded 2nd place for a short paper and the presentation of his poster at the 17th International Congress on Polymers in Concrete (ICPIC) 2023 in Warsaw, Poland, entitled: ‘Alkaline Hydrogels – Multifunctional Materials for Concrete Rehabilitation’.
Prof Weichold gave a presentation entitled ‘Ionic Conductive Polyesters-Assessing the Risk of Corrosion in Steel-Reinforced Concrete’
Addendum Nov. 2024: Both articles are published in Springer Proceedings in Materials, Vol. 61 ‘Concrete-Polymer Composites in Circular Economy’. See also entry from 9 November 2024.
21st ibausil
Prof. Weichold gave a keynote lecture entitled ‘Alkaline, multifunctional hydrogels in repair’ at the 21st International Building Materials Conference (ibausil), 13-15 September 2023 in Weimar.
Presentation
Tim Mrohs gave a presentation entitled: ‘Crosslinked, Highly Swelling Diallyldimethylammonium Hydrogels’ at the 13th International Symposium on Polyelectrolytes (ISP) 2023 in Prague, Czech Republic.
Full steam ahead – hold on to your heads!
In order to better understand the sorption properties of our materials under real conditions, we are now using the DVS Resolution Advance from Surface Measurement Systems. This highly specialised device allows us to measure the water and gas adsorption of our materials precisely and under controlled environmental conditions.
The DVS Resolution Advance is characterised by its high sensitivity and flexibility. It enables detailed insights into the adsorption and desorption processes as well as the calculation of important parameters such as sorption isotherms and diffusion coefficients. This data is crucial for further optimising the functionality and efficiency of our materials.
Presentation
Tim Mrohs gave a presentation at the 59th Aachen Building Materials Day 2022 in Aachen, Germany entitled: ‘Low-acrylate gels for corrosion protection – theory’.
