Archive for November, 2024
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
