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SUMMARY:Modelling degradation processes of cement-based materials by means
  of mechanics of multi-phase porous media
DTSTART:20170224T121500
DTEND:20170224T131500
DTSTAMP:20260414T105948Z
UID:b1a3f32e67b667f5b6893d65e3a1fee2011dc46e86d769711c04bdf6
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr Dariusz Gawin\, D.Sc.\, Ph.D.\, M.E.\, The Łódź Un
 iversity of Technology\, Łódź\, Poland\nA general approach [1] to model
 ling various degradation processes in cementitious materials\, due to comb
 ined action of variable hygral\, thermal\, chemical and mechanical loads\,
  will be presented. Mechanics of multiphase porous media and damage mechan
 ics are applied for this purpose. Kinetics of physico-chemical processes\,
  like for example: cement hydration [2\,3]\, salt crystallization/dissolut
 ion [4]\, calcium leaching [5]\, Alkali Silica Reaction (ASR) [6]\, and wa
 ter freezing/thawing [7]\, is described with evolution equations based on 
 thermodynamics of chemical reactions. The mass-\, energy- and momentum bal
 ances\, the evolution equations describing chemical reactions and deterior
 ation processes\, as well as the constitutive and physical relations will 
 be presented. The mutual couplings between the chemical\, hygral\, thermal
  and mechanical processes will be discussed\, both from the viewpoint of p
 hysicochemical mechanisms and mathematical modelling. Numerical methods us
 ed for solution of the model governing equations will be presented. For th
 is purpose the finite element method is applied for space discretization a
 nd the finite difference method for integration in the time domain.\nSever
 al examples of the model application for analysing transient chemo-hygro-t
 hermo-mechanical processes in cementitious materials will be solved and di
 scussed. The first example deals with concreting and maturing of massive s
 tructure. The second example concerns calcium leaching from a concrete wal
 l due to chemical attack of pure water\, exposed to gradients of both temp
 erature and pressure. The third one describes cracking of concrete element
 \, caused by development of expanding products of ASR. The fourth example 
 concerns the salt crystallization during drying of a wall made of concrete
 /ceramic brick\, causing degradation of a surface layer due to development
  of crystallization pressure. The last example concerns freezing and thawi
 ng of a wet concrete wall in variable temperature and relative humidity\, 
 causing frost damage.\nREFERENCES\n[1] D. Gawin\, M. Koniorczyk and F. Pes
 avento\, “Modelling of hydro-thermo-chemo-mechanical phenomena in buildi
 ng materials”\, Bulletin of The Polish Academy of Sciences: Technical Sc
 iences\, Vol. 61(1)\, 51-63\, (2013).\n[2] D. Gawin\, F. Pesavento\, B.A. 
 Schrefler\, Hygro-thermo-chemo-mechanical modelling of concrete at early a
 ges and beyond. Part I: Hydration and hygro-thermal phenomena\, Int. J. Nu
 m. Meth. Engng\, Vol. 67\, No. 3\, 299-331 (2006)\n[3] D. Gawin\, F. Pesav
 ento\, B.A. Schrefler\, Hygro-thermo-chemo-mechanical modelling of concret
 e at early ages and beyond. Part II: Shrinkage and creep of concrete\, Int
 . J. Num. Meth. Engng\, Vol. 67\, No. 3\, 332-363 (2006)\n[4] M. Koniorczy
 k\, D. Gawin\, “Modelling of salt crystallization in building materials 
 with microstructure - poromechanical approach”\, Construction and Buildi
 ng Materials\, Vol. 36\, 860-873 (2012).\n[5] D. Gawin\, F. Pesavento and 
 B.A. Schrefler\, “Modeling deterioration of cementitious materials expos
 ed to calcium leaching in non-isothermal conditions”\, Computer Methods 
 in Applied Mechanics and Engineering\, Vol. 198(37-40)\, 3051-3083\, (2009
 ).\n[6] F. Pesavento\, D. Gawin D.\, M. Wyrzykowski\, B.A. Schrefler and L
 . Simoni\, “Modeling alkali-silica reaction in non-isothermal\, partiall
 y saturated cement based materials”\, Computer Methods in Applied Mechan
 ics and Engineering\, Vol. 225-228\, 95-115\, (2012).\n[7] Koniorczyk M.\,
  Gawin D.\, Schrefler B.A.\, Modelling evolution of frost damage in fully 
 saturated porous materials exposed to variable hygro-thermal conditions\, 
 Computer Methods in Applied Mechanics and Engineering\, Vol. 297\, 38-61 (
 2015).\n\nShort Bio : Prof. Dariusz Gawin got his Ph.D. in 1990 in Civil E
 ngineering\, Łódź University of Technology and his D.Sc.in 2001 in Buil
 ding Physics\, Łódź University of Technology both with honours. His has
  the position of an ordinary professor at the same University and is also 
 Vice-rector of the University for Innovations and Development. He is also 
 the Head of Building Physics and Building Materials Department. Between 19
 93 and 1994 he was a Post-doctoral fellow at University of Padova\, Italy.
  In 1999 he joined Oak Ridge National Laboratory\, Oak Ridge (TN)\, USA as
  a Post-doctoral research associate.\nFrom 2001-2005 he was a visiting pro
 fessor at the Faculty of Engineering at University of Padua\, Italy and ag
 ain he was a visiting researcher at the same faculty from 2013-2014.\nHis 
 research areas are :\n\n	Durability of building materials – numerical mo
 delling with mechanics of multiphase porous materials\;\n	Sustainable buil
 dings\, energy efficiency and energy auditing of a building\;\n\nHe publis
 hed up to now 9 books and monographs\; 98 papers in scientific and technol
 ogical journals (42 in the Web of Science database)\; 44 chapters in scien
 tific books\; 252 papers on international and national scientfic conferenc
 es\; 63 publications included into the Web of Science database were cited 
 >1390 times (>1110 without auto-citations) resulting in the Hirsch index h
 = 19
LOCATION:GCB330 http://plan.epfl.ch/?lang=fr&room=GCB330
STATUS:CONFIRMED
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