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SUMMARY:CESS Seminar: Multiscale methods for predicting the long‐term cr
 eep deflection of concrete structures
DTSTART:20190315T121500
DTEND:20190315T130000
DTSTAMP:20260407T125334Z
UID:c2b3c54fd36e52066a7952fae5224cee02acbf6db4ebe5d6666bd821
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Luca Sorelli\, professor at Université Laval (Quebec)\,
  director of the laboratory on Multiscale Characterization of Construction
  Materials (MCCM)\nAbstract\nRecent works have shown that the several nati
 onal codes provide alarming unsatisfactory prediction of the long-term def
 lection of concrete bridges being monitors in USA. The crux of the problem
  is to predict long-term (e.g.\, 30-50 years) deflection from laboratory s
 hort-term tests (e.g.\, over few years\, if not months). Can we predict th
 e long-term deflection of concrete structures by laboratory short-term tes
 ts?\nTo answer\, this work takes a different approach to characterize conc
 rete creep by explicitly considering the creep mechanisms that are at stak
 e at the microstructure scale.  Thanks to the tiny-probed volume\, nano- 
 and micro-indentation can quickly access to the long-term creep properties
 . This talk presents latest results on the effect of water\, which allows 
 speculating that the rapid equilibrium between capillary and disjoining fo
 rces affects the creep mechanism between the C-S-H sheets at the smaller s
 cale. After modeling the dual creep/relaxation mechanism of creep by visco
 elastic theory\, the creep compliance function are up-scaled by micromecha
 nics to predict the long-term creep. Finally\, the up-scaled creep curve f
 or mortar and concrete is compared against experimental results\, the loga
 rithmic basic creep formula of 2010 fib model code and the well-recognized
  Bazant B4 model.\n\nBio\nDr. Luca Sorelli is professor at Université Lav
 al (Quebec) and director of the laboratory on Multiscale Characterization 
 of Construction Materials (MCCM). He has worked at different international
  research groups\, such as\, the durability division at IFSTTAR (Paris)\, 
 the civil engineering department at MIT (Cambridge) and the LCR research c
 enter of LafargeHolcim (Saint-Quentin-Fallavier). Dr. Sorelli is member of
  the industrial consortium CIRCERB on eco-responsible structure. The visio
 n of his research group is to develop efficient material-to-structure appr
 oach for fostering structural applications of new composite materials\, wh
 ich can fulfil the needs of today society and address the environmental ch
 allenges.
LOCATION:GC B3 30 https://plan.epfl.ch/?room=GCB330
STATUS:CONFIRMED
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