n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Deformation mechanics of rubble masonry concrete : technical paper




The deformation mechanics of rubble masonry concrete (RMC) are explored experimentally and theoretically with reference to the behaviours of analogous concrete and natural conglomerate. The composite stiffness of large RMC cubic specimens, containing rock types exhibiting diametrically extreme values of stiffness, was determined dynamically and measured statically to gain a preliminary indication of the range of values likely to be encountered. A broad spectrum of moduli of deformation and Poisson's ratios were recorded. An idealized finite element model is used to gauge the effects of spherical inclusion size and inclusion size and inclusion suspension within the matrix as well as the effect of orientation of elongated particles with respect to the principal load axis. It is concluded that in addition to the parameters currently known to govern the stiffness of conventional concrete, RMC stiffness is probably also affected by the extent of inter-particle contact, shape and orientation of elongated inclusions with respect to the principal stress axis and the maintenance of bond at the transition interface.


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