Robisson, A., Daneshvar, D., Deix, K., Dhar, S., Kirnbauer, J., Liberto, T., & Pauser, M. (2022). Dämmung und frostsichere Verwendung mit recyclefähigen Betonschaum - Year 4 (No. 1). http://hdl.handle.net/20.500.12708/191259
E207-01 - Forschungsbereich Baustofflehre und Werkstofftechnologie
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Report No.:
1
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Date (published):
30-Sep-2022
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Number of Pages:
32
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Keywords:
cement; rheology; interface; recycling
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Project (external):
FFG
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Project ID:
878151
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Additional information:
This fourth year project achievements include:
- The rheological characterization of an alkali-activated binder (AAB) under flow, quantifying its yield stress. Observations of the sample in between the two parallel plates of the rheometer show that the AAB slurry tends to localize strain under flow, similarly to Portland cement slurries.
- The precise characterization of early reactivity of gypsum/cement mixtures and the potential formation of secondary ettringite was performed using (in-situ) X-ray powder diffraction (XRPD) measurements, coupled with pH and heat of hydration (calorimetry) evaluations. Cement mixtures were chosen from low aluminate content to high aluminate targeting the understanding of the mechanisms of internal sulfate attacks (ISA).
- The development of a 3D numerical model to predict damage linked to drying shrinkage in sloped floors.
- The design and characterization of concretes made of recycled concretes (fresh state).
- The mechanical characterization of hardened AAB and lightweight concrete made with expanded clay beads.
Specific work packages are described in section 2.2 with project abstracts in the next pages. The work packages are incorporated into the 4 sub-projects (1. Internal sulfate attack: An issue in recycled aggregate concretes, 2. Yield stress of cement paste & AAB and determination of local flow heterogeneities by imaging, 3. Sustainable concrete: alkali activated binders, recycled concrete binder and lightweight concrete using expanded clay aggregates, 4. Interfaces: Bond strength in sloped floors and influence of angle on failure due to drying shrinkage).
The team (co-authors of reports) is composed of Dana Daneshvar, Karl Deix, Subhransu Dhar, Johannes Kirnbauer, Teresa Liberto and Agathe Robisson.
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Research Areas:
Materials Characterization: 50% Surfaces and Interfaces: 25% Structure-Property Relationsship: 25%
