Assessment of Drying Effects of Triaxial Mechanical Behaviour of a Mature Mortar

The long term behavior of cementitious materials depends on mechanical, hydraulic, physical and chemical degradation mechanisms and their coupling. This study aimed to evaluate the coupled effect between drying shrinkage and triaxial mechanical behavior. A normal mortar (French norm) wit a W/C ratio of 0.5 was cast after 5 days, immersed in water for 6 months in order to obtain a highly mature mortar and to be able to neglect autogenous and thermal shrinkages. Several standard triaxial compression tests with loading-unloading cycles were carried out on cylindrical samples at different drying time and water content. Furthermore, the drying shrinkage of the same mortar on prismatic samples was measured. It was observed that an increase of deviatoric strength and a decrease of Young’s modulus and Poisson’s ratio occurred. These results are commented through different mechanisms induced by the drying process. Indeed, the latter leads to strengthening of mortar by creating uniform and non uniform hydraulic gradients through the mortar sample. Microcracking of mortar was also included if the tensile strength was exceeded. Thus, these effects will have an influence on elastic property, damaging process and failure stress of material, which have to be taken into account in a reliable modeling.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 69-78
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010822
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 10:56AM