Contractors aware of the versatility of shotcrete might not be aware of the wide selection of concrete pumps available for repair with wet-mix shotcrete. This roundup focuses on swing-tube pumps, which can handle concrete with ¾-minus aggregate as well as wet-mix shotcrete, which may contain smaller aggregates. Most models have watertight valves to keep the mix liquid.
Featured pumps have 3- to 7-inch-diameter materials cylinders and 3- to 6-inch-diameter outlet valves. Applications range from erosion protection along drainage areas and swimming pools to repair of reinforced-concrete tunnels, bridges and marine structures.