Organisation/Company: CNRS
Department: Fédération « Fluides, Energie, Réacteurs, Matériaux et Transferts »
Research Field: Engineering » Materials engineering, Physics » Acoustics
Researcher Profile: Recognised Researcher (R2)
Country: France
Application Deadline: 7 Dec 2024 - 23:59 (UTC)
Type of Contract: Temporary
Job Status: Full-time
Hours Per Week: 35
Offer Starting Date: 1 Jan 2025
Is the job funded through the EU Research Framework Programme? Not funded by a EU programme
Is the Job related to staff position within a Research Infrastructure? No
Offer Description The aim of the project is to improve knowledge of the link between the pore microstructure and water content of the mineral phases of the cementitious matrix and the matrix itself, and viscoelastic properties at different scales. The challenges identified are:
The development of an experimental methodology for the mechanical characterization of a material with "multi-scale heterogeneity".
The identification of the effect of humidity on the behaviors identified at different scales.
The Fermat federation has just acquired a controlled-ambient indentation platform that offers investigative possibilities for overcoming these issues, in particular thanks to the presence of indentation heads capable of covering all relevant scales (from micrometer to millimeter) in a totally controlled environment in terms of relative humidity (and even under submerged conditions).
With the ultimate aim of adapting and/or confirming visco-elasto-plastic behavior models for the cementitious matrix and the dependence of their evolution laws on the state of porosity saturation at different scales, indentation tests can be simulated by finite elements for identification purposes.
The scientific work of the recruited researcher includes three types of activities:
Independent experiments:
Sample production and preparation at various scales.
Mineralogical and microstructural characterization (SEM/EDS, XRD, NMR, Porosimetry (water, MIP), microtomography, BET).
Multiscale viscoelastic characterization at controlled humidity by Nanoindentation (phase scale / indentation matrix and statistical analysis to identify different modes); Microindentation at matrix scale (local characterization); Compression on cylinders at matrix scale (global characterization).
Analytical homogenization modeling to establish the link between microstructure and properties.
Writing and publishing scientific articles based on the results.
The postdoc candidate will be integrated into a multi-disciplinary team (LMDC, CIRIMAT, ICA) in Toulouse. His/her main place of work will be the LMDC, but he/she will be required to carry out experiments in the three laboratories under the supervision of researchers from these laboratories.
This project is funded by the FERMaT federation under the "Materials and their Applications" theme. It is part of a working group on methodological and scientific issues concerning the links between microstructure, environmental conditions and macroscopic properties of cementitious materials for construction.
Minimum Requirements PhD in the field of cementitious materials or mechanical surface characterization.
Experience in micro or nanoindentation would be desirable.
Fluency in English.
Highly motivated and committed to the project.
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