Abstract

Rheological properties of fresh cementitious materials to a large extent depend on mix design and processing conditions, currently leaving only limited options to actively modify workability or flowability during casting. Cutting-edge research at Ghent University has led to a scientific break-through, enabling active intervention during processing, based on the application of external signals to trigger an intended response in the material. This presentation will explain the first concepts of Active Rheology Control (ARC) and Active Stiffening control (ASC) of cementitious materials. Two different routes have been studied, based on responsive mineral particles, and based on newly developed switchable superplasticizers. First proofs of concept at fundamental paste level will be explained. Remaining challenges will be identified. Finding solutions to these challenges will lead to marvelous opportunities for concrete pumping and formwork casting in general, and for 3D printing of concrete structures more particularly.

The meeting can be viewed in CivEng or joined online:

https://eng-cam.zoom.us/j/82357897828?pwd=SnhDdFJjQS9xNlFFQWtTTW5LNzlGdz09