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SUMMARY:Investigation of the creep of cementitious materials by indentatio
 n
DTSTART:20140317T131500
DTSTAMP:20260916T220424Z
UID:6604db30f8d64652dca7e4d06fdc2d1ea230806a10f25e498b671ed0
CATEGORIES:Conferences - Seminars
DESCRIPTION:Matthieu Vandamme\, École des Ponts ParisTech\, France\nConcr
 ete creeps (i.e.\, slowly deforms under constant load) over decades\, at a
  pace that can be detrimental to the lifespan of civil engineering structu
 res. However\, in spite of decades of research\, the origin of this viscou
 s behavior still remains unclear. Here we use the indentation technique to
  study this creep of cementitious materials over a variety of length scale
 s. The indentation technique is a handy contact mechanical test that consi
 sts in pushing a probe of known geometry and mechanical properties onto th
 e surface of the material to be tested and enables to measure -- among oth
 ers -- the creep properties of the indented material. We compare minutes-l
 ong microindentation creep experiments on cement paste with years-long mac
 roscopic uniaxial creep experiments on concrete: we thus show that the ind
 entation technique enables to measure the rate of long-term creep of cemen
 titious materials orders of magnitude faster than conventional macroscopic
  testing. We also apply nanoindentation to measure the creep properties of
  micrometric phases of calcium silicate hydrates (C-S-H)\, which are the '
 glue' of cement paste and are mostly responsible for the viscous behavior 
 of this latter: this study and an analogy with the viscous behavior of soi
 ls serve as a basis to discuss the origin of creep. \nReferences: M. Vand
 amme\, F.-J. Ulm\, Nanoindentation investigation of creep properties of ca
 lcium silicate hydrates. Cement and Concrete Research 52: 38-52 (2013). Q.
  Zhang\, R. Le Roy\, M. Vandamme\, B. Zuber\, Long-term creep properties o
 f cementitious materials: Comparing microindentation testing with macrosco
 pic uniaxial compressive testing. Cement and Concrete Research 58: 89-98 (
 2014).\nBio: Curriculum\n    2008 - now : Researcher at Laboratoire Nav
 ier\, Ecole des Ponts ParisTech\, Université Paris-Est\, Champs-sur-Marne
 \, France\n    2004 - 2008 : PhD at Massachusetts Institute of Technolo
 gy\, Cambridge\, MA. Thesis on : The nanogranular origin of concrete creep
  : A nanoindentation investigation of microstructure and fundamental prope
 rties of calcium-silicate-hydrates\n    2002-2003 : M.S. at Ecole des P
 onts ParisTech\, Champs-sur-Marne\, France \; M.Eng. in civil engineering 
 at Ecole des Ponts ParisTech\, Champs-sur-Marne\, France\n    1999-2002
  : Bachelor at Ecole Polytechnique\, Paris\, France\nResearch interests\n
     Mechanics and physics of porous solids\n    Cementitious materia
 ls and geomaterials\n    Adsorption-induced deformation\n    Nanoind
 entation technique\n    Computed X-ray microtomography
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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