Structural Engineering and Mechanics

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Aggregate shape influence on the fracture behaviour of concrete

  • Azevedo, N.Monteiro (Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa) ;
  • Lemos, J.V. (LNEC)
  • Received : 2005.10.07
  • Accepted : 2006.06.20
  • Published : 2006.11.10
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Abstract

The Discrete Element Method, DEM, is increasingly used in fracture studies of non-homogeneous continuous media, such as rock and concrete. A 2D circular rigid DEM formulation, developed to model concrete, has been adopted. A procedure developed to generate aggregate particles with a given aspect ratio and shape is presented. The aggregate particles are modelled with macroparticles formed by a group of circular particles that behave as a rigid body. Uniaxial tensile and compression tests performed with circular and non-circular aggregates, with a given aspect ratio, have shown similar values of fracture toughness when adopting uniform strength and elastic properties for all the contacts. Non-circular aggregate assemblies are shown to have higher fracture toughness when different strength and elastic properties are set for the matrix and for the aggregate/matrix contacts.

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