A New Testing Method to Investigate the Compacting Behaviour of Fresh Concretes Under Impact Loading |
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Authors: | S Pattofatto A Poitou H Tsitsiris H Zhao |
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Institution: | (1) LMT Cachan, E.N.S. de Cachan, C.N.R.S.-U.M.R. 8535, 61 avenue du Président Wilson, 94235 Cachan Cedex, France;(2) Institut GeM, Ecole centrale de Nantes, CNRS, Université de Nantes, 1 rue de la Noe BP 92101, 44321 Nantes Cedex, France |
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Abstract: | This paper presents a new instrumented Proctor test using a Hopkinson bar which allows for the original measurement of forces
and velocities during the impact loading on soft fresh concrete samples. For this purpose, the specific points of using low
impedance Nylon bar as well as the two-point measurement method to recover coupled waves are discussed. The whole test consists
of successive impacts of low velocity (less than 3 m/s) exerted on the compressible specimen of a fresh concrete. The proposed
original measurement allows for a quantitative comparison of the behaviour of the fresh concrete submitted to quasi-static
and impact compaction. It shows that impact compaction is more efficient than quasi-static case. However, the increase of
the impact velocity seems to reduce the efficiency. There exists probably an optimal loading path. The further understanding
of the behaviour of fresh concrete under low velocity impact should be an interesting way to improve the industrial compacting
process. |
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Keywords: | Fresh concrete Compaction Proctor test Hopkinson bars |
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