Materials and Solutions to Concrete Batching Plant

1. Concrete samples Two types of concrete samples were used in this study: – Three tons of lab-made concrete samples representative of concrete waste from revolving drum. Concrete was prepared using a mixture of alluvial aggregates from the Seine valley with 37.4% of sand and 59.4% of gravels, the size distribution of these aggregates being given in Table 1, a water-to-cement mass ratio of 0.15 Mini concrete mixer, an aggregate-to-cement ratio (A/C) of 400% by volume and was cast in slab. – Concrete waste collected on a French demolition site. Maximum size of the concrete samples was taken to 50 mm of mean diameter essentially because of size constraint of the vessel dedicated to electrohydraulic treatment experiments. The same size of concrete samples has also been chosen for microwave embrittlement so that to compare the ef?ciencies of both technics on the same basis.

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2. Experimental set-up and operation

Two technologies were evaluated in this study. The ?rst one was based on high voltage discharge pulses and was conducted with a selFrag Lab machine egg laying block machine, manufactured by selFrag AG. The machine selFrag Lab usually treat minerals or other samples in the 1 kg range. Samples are loaded in a portable process vessel ?lled with water. Several settings can be chosen such as number of pulses diesel concrete mixer, discharge voltage (controls the energy per pulse) and elec- trode gap of discharge. When the predetermined voltage is reached, the energy of the pulse generator is discharged from the electrode through the solid sample to the grounded bottom (counter electrode) of the process vessel.