Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 98: Composites and Functional Polymer Hybrids

CPP 98.7: Talk

Thursday, March 19, 2020, 16:30–16:45, ZEU 114

Model cement systems studied by Colloidal-Probe AFM (CP-AFM) — •Simon Becker and Regine von Klitzing — Soft Matter at Interfaces, Institut für Festkörperphysik, TU Darmstadt, Germany

In nowadays construction industry due to ecological and financial reasons the tailored rheology of building materials such as concrete and therefore cement is of great importance. Especially the rheology of cement pastes in the early stage can be influenced by additives such as polycarboxylate ether (PCE) type super plasticizers in a viscosity reducing manner. For tuning the system a better understanding of the interplay between the nanoscopic forces on cement particles and the macroscopic rheology is of essential importance.

In the present study the interaction between model particles is investigated with colloidal-probe atomic force microscopy (CP-AFM). Thereby micrometer scaled spherical silica beads are used as model cement grains to imitate the silicate phases of cement clinker. Furthermore spray dried clinker particles are used for a more application-related approach. The latter ones are restricted to measurements in non-aqueous solutions to prevent hydration. The influence of the interaction forces in presence of different pH and different ionic strength and ion types such as KCl and CaCl₂ is investigated for these model systems.