Experimental analysis of fresh concrete under dynamic loadings

Abstract : This paper presents a new experimental technique to study the behavior of fresh concrete submitted to a shock pulse. The aim is to determine the source of the efficiency of dynamical compaction. The test is based on the Hopkinson bars technique. The apparatus is vertical and allows to apply successive impacts on the specimen. Moreover, it allows the indirect measurement of stress and velocity at the interaces between the specimen and the bars. First, measurement technique is validated. Then, the first experimental results are presented: measurement of the velocity of the wave propagating into the material, depending only of the density; and analysis of the efficiency of dynamical compaction compared to quasi-static compaction.
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Stéphane Pattofatto, Han Zhao, Arnaud Poitou. Experimental analysis of fresh concrete under dynamic loadings. Journal de Physique 4, EDP Sciences, 2004, 110, pp.447-451. ⟨10.1051/jp4:20020734⟩. ⟨hal-01006830⟩



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