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Particle size effect on EPS lightweight concrete

Karim Miled 
Abstract : It had been observed in literature that Expanded Polystyrene (EPS) lightweight concrete compressive strength increases significantly with a decrease in polystyrene beads size Ø, for the same concrete density. So that, the main purpose of the thesis is to identify the physical origin of this particle size effect. In the first part of this work, a combined experimental and numerical investigation has been conducted on a 2D idealized EPS concrete to study size effect and failure mechanism under compression. The idealized lightweight concrete is obtained by replacing EPS beads having almost zero strength by holes of the same size drowned in a homogeneous cement matrix. In the second part of this work, an experimental investigation has been conducted on three EPS lightweight concretes containing three polystyrene beads sizes and having densities ranging from 1200kg/m3 to 2000kg/m3. Moreover, to free the size effect problem from the specimen size D by ensuring that the representive volume element (RVE) for the EPS concrete compressive strength is already reached, compressive tests have been carried out on homothetic EPS concrete cylinders. Moreover, we have observed that the compressive strength increases with an increase in the matrix heterogeneities (sand grains) maximum size lm. On the basis of the analysis of EPS concrete failure modes observed experimentally, a phenomenological approach has been conducted to explain the EPS concrete particle size effect and to identify the law governing it. Finally, we have proposed a numerical 2D study on a lattice model which reproduces qualitatively the particle size effect observed experimentally.
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Submitted on : Thursday, July 20, 2006 - 8:00:00 AM
Last modification on : Thursday, July 20, 2006 - 8:00:00 AM
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  • HAL Id : pastel-00001820, version 1



Karim Miled. Particle size effect on EPS lightweight concrete. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2005. English. ⟨pastel-00001820⟩



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