Demolition of concrete by thermal shock spallation: a mesoscopic numerical study based on embedded discontinuity ﬁnite elements
INTERNATIONAL JOURNAL OF FRACTURE
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Julkaisun pysyvä osoite on
This paper deals with 2D (plane strain) and axisymmetric numerical modelling of concrete frac- ture processes under mechanical and thermal loading. A mesoscopic modelling approach with an explicit rep- resentation of aggregates as Voronoi polygons is cho- sen while the concrete fracture model is based on rate- dependent embedded discontinuity ﬁnite elements with Rankine criterion indicating a new crack initiation. This choice enables the study of the effects of inherent crack populations on the response of concrete under mechan- ical and thermal loading. In the numerical examples, the performance of the present modelling approach is ﬁrst demonstrated in the uniaxial compression and ten- sion tests under plane strain conditions. Then, the prob- lem of thermal spallation of concrete surface under dry conditions due to a high intensity, short duration heat ﬂux is simulated under axisymmetric conditions. The underlying uncoupled thermo-mechanical problem is solved with an explicit time marching scheme based on the staggered approach. Different heat ﬂux inten- sities and heating times as well as combined effect of surface roughness and pre-stress ﬁeld are tested. The simulation results suggest that demolition of concrete structures by heat shock is a viable method.
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