Due to the special circumstances imposed by COVID-19, many events are being postponed or cancelled. Please look through the calendar to see which events are affected.
The next ROC&TOK webinar will take place on Thursday, May 6th at 1PM UTC time / 3PM CET (GMT+2) and will be one hour long (30-minute presentation + 30-minute interaction).
Presented by Dr. Nicolas Roussel, Research Director, Laboratoire Navier, Université Gustave Eiffel, France, the webinar will address the following subject: Rheo-physics and shaping of fresh cement-based materials:
Interest in the rheological properties of fresh cement-based materials has steadily grown in the last couple decades due to the development of new automated concrete shaping processes. These “large-scale” additive manufacturing technologies are progressively shifting the usual rheological requirements of standard cement-based materials.
In the first part of this lecture, we will go through the physical and chemical origin of fresh cement-based materials macroscopic properties and their evolutions with time. We will show the dominant role of colloidal attractive forces on short time scales. We will moreover describe, on longer time scales, the reversible macroscopic consequences of the non-reversible cement hydration reaction.
In the second part, we will describe the way these properties dictate the outcome of both typical formative and recent additive shaping processes. We will in parallel revisit these processing technologies under the light of the central role played by gravity-induced stresses and their competition with yield stress and its time evolution. This will allow us to deal with the exact extent of the adjective “large-scale”.
Please register by following this link and add the event to your calendar!
Registration for this webinar closes on 30th April at mid-day UTC.
The ROC&TOK are posted on the RILEM Youtube Channel here (do not hesitate to subscribe!).
Should you need assistance to register, please contact assistant[@]rilem.org.
Thursday 6 May 2021
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