Schleibinger Testing Systems

Workshop, February, 29, 2024

Rheological behaviour of geopolymer mortars and concretes, Thomas Heiermann, Stephan Uebachs, Brameshuber + Uebachs Ingenieure GmbH, Aachen, Germany

Mortar lab

We first tested a geoplymer or alkali activated mortar in the Viskomat NT. The mortar (fishbone) probe and the vane probe have been used.

 

Testing geopolymer mortar with the Viskomat NT in the lab.

Shear rate over time

Torque over Time, red curve vane probe, other curves fishbone probe.

 

Flowcurve first slope, minute 0 ... 1

 

Flowcurve first downgoing slope minute 2 ... 3

 

Flowcurve last downgoing slope minute 5 ... 6

 

Based on this mortar a concrete was mixed (max. aggregate size 16 mm)

Following tests heve been made:

• spread table
• concrete rheometer eBT-V
• rheometer for pumpability Sliding Pipe Rheometer - SLIPER

 

Test in the concrete lab in the foreground Dr. Stephan Uebachs, ibu.

 eBT-V in the foreground setup V-mode

 

eBT-V speed profile screen shot from the App

Speed profile for the eBT-V rheometer in the V mode

Flowcurve from the eBT-V App

 

 

Same flowcurve as above, eBT-V, the downgoing slope is evaluated

 

SLIPER measurment

 

 

 SLIPER flow-rate vs. max. pressure for different strokes. Screenshot from the App.