a construction site mixer truck rear cement dispenser

construction mixers mixer truck trucks lorry lorries rear back cement gravel soil mix mixing combine dispenser dispensers trough sand sands gravels concrete paste soft form water mount mounted large big huge container containers drum drums rotate rotating revolve revolving filled wet soften hard harden process processing stir stirring aggregate aggregates agitator agitators continuous agitation dispense dispensing state construct site sites equipment vehicle vehicles heavy duty load loading pour pouring