INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Mechanical properties of organic-ceramic composites hierarchically structured
Autor/es:
IGNACIO RINTOUL; ANALIA QUIROGA
Lugar:
Santa Fe
Reunión:
Congreso; 14° SAM-CONAMET XIII IBEROMAT XIII Simposio MATERIA; 2014
Institución organizadora:
Asociación Argentina de Materiales (SAM) y la Universidad Nacional del Litoral
Resumen:
P { margin-bottom: 0.21cm; }
Climatic and tectonic catastrophes such as the Katrina hurricane in
2005, the tsunamis in Southeast Asia in 2004 and 2006 and more
recently the earthquakes in Haiti and Chile in 2010, have pushed the
improvement and development of building materials for cheap, rapid
and safe construction. Wool wood cement composites (WWCC)
are widely used materials constituted of wool wood (WW) and Portland
cement (PC). The material presents excellent mechanical, chemical and
biological properties. However, the understanding of its mechanical
behavior is rather limited. Such knowledge could contribute to
improve and design their properties. In general, the prediction of
the properties of a composite knowing the properties of their
constituents is a real challenge. The situation is particularly
complex in cases such as composites which present different
structural levels. Here, we propose the WWCC to be a hierarchically
structured as 3D sponge, 2D laminated and particulated+fibrous in the
cm, mm and micron scales, respectively. We present a deduction and
experimental validation of a set of expressions describing the
stress-strain plot of such type materials. Elastic modulus of the WW
and PC and their relative mass ratios, the apparent density of the
material and geometry of the WW are the necessary input data.
Mechanistically, the model predicts failure by buckling at the
mesoscale combined with bending + interphase detaching at the
microscale. Porosity and orientation degree are also considered in
the model.