Aliva-257 concrete sprayer

The Aliva 257 is a versatile rotor machine for both dry-mix and wet-mix shotcrete in small and medium volumes. The machine has hard-wearing rubber sealing plates in addition to robust steel plates, which the manufacturer highlights as the basis for low wear and minimal downtime. The output is infinitely adjustable from 0.7 to 9.6 m³/h depending on the rotor size selected, and the machine has a light and compact design. Applications include concrete repair, slope stabilisation, securing excavation pits, pool construction, and tunnelling and mining.

The manufacturer's data sheet shows three rotor sizes: M (6.0 l) with 1.9–5.0 m³/h, L (9.0 l) with 2.7–7.2 m³/h and XL (12.0 l) with 3.6–9.6 m³/h. The machine is driven by an electric motor for 3 x 380–480 V / 50–60 Hz (air drive on request), has a Ø 60 mm outlet and a 57 litre hopper. The dimensions are 1580 x 800 mm (L×W), and the height is 1256–1391 mm depending on the rotor; the weight is given as 650 kg. The conveying distance is 40 m, which can be extended to 100 m with steel pipes. The maximum aggregate size is 16 mm for bagged material, site mix and wet mix from a concrete plant.

For the kit with an M or L rotor, the manufacturer recommends a compressor of 7.2 m³/min (255 cfm) for dry-mix spraying and 400 cfm for wet-mix spraying; with an XL rotor, 10 m³/min (350 cfm) and 525 cfm. In dry-mix spraying, the machine can handle long horizontal or vertical conveying distances, with less dust and reduced rebound. According to the manufacturer, the machine is small and easy to move, easy to handle, clean and maintain, and well suited to construction sites with many interruptions and to work in confined spaces.