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About microcracking due to leaching in cementitious composites: X-ray microtomography description and numerical approach

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Rougelot Thomas; Burlion Nicolas; Bernard Dominique; Skoczylas Frédéric
journal (abréviation) Cement and Concrete Research (Cement Concr Res)
volume (numéro) 40 (2)
  
pages 271 – 283
résumé Chemical shock of cement based materials leads to significant degradation of their physical properties. A typical scenario is a calcium leaching due to water (water with very low pH compared with that of pore fluid). The main objective of this paper is to evaluate the evolution of microstructure induced by leaching of a cementitious composite using synchrotron X-ray micro tomography, mainly from an experimental point of view. In this particular case, it was possible to identify cracking induced by leaching. After a description of the degradation mechanism and the X-ray synchrotron microtomographic analysis, numerical simulations are performed in order to show that cracking is induced by an initial pre-stressing of the composite, coupled with decalcification shrinkage and dramatic decrease in tensile strength during leaching. X-ray microtomography analysis allowed to make evidence of an induced microcracking in cementitious material submitted to leaching.
mots clés Cementitious composites; Endogenous and decalcification shrinkages; Leaching; Microcracking; X-ray computed microtomography
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