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Cementitious composites during leaching and drying: X-ray microtomography analysis of cracking pattern dependence on size of rigid inclusions

type de publication      communication internationale avec actes publiés
date de publication 2010
auteur(s) Peng Cheng; Rougelot Thomas; Burlion Nicolas; Bernard Daniel
  
conférence 7th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-7
     dates de 24-05-2010 à 27-05-2010
     lieu Seoul, South Korea
     nom des actes FraMCos-7, 2010 Proceedings
  
pages 1084 – 1091
ISBN / ISSN 978-89-5708-180-8
résumé hort and long-term behaviors of concrete st ructures are of importance when dealing with du- rability aspects. One particular interesting aspect is the change in microstructure of concrete submitted to dry- ing or leaching processes, and a potentially induced cracking pattern. Experimental invest igations which fo- cus on the effect of the dimensions of aggreg ates over cracks are proposed in this paper. The study is conducted on geometrically simplified cementitious materi als (composites cementitious matrix-spherical rigid glass inclusions). The samples are sub mitted to accelerated leaching or to drying, and the evolution of their microstructure is regularly recorded by means of X-ray microtomography, at a resoluti on of 5.3 μm. Two me- thods are proposed to study the crac king pattern, which appears to be greatly dependant of the size of inclu- sions. In particular, it appears th at a larger diameter of inclusions tends to increase the crack opening but to decrease the number of distinct cracks.
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