Abstract: Apparatus for the rapid production of concrete having a grout slurry forming device, a cyclonic mixer for aggregate and a weighing device for feeding weighed amounts of aggregate to the cyclonic mixer. The slurry forming device including, subjecting fine particles in a liquid to the action of one or more rotating disc shaped blades, arranged to create within the slurry alternating areas of high and low pressures, thereby breaking up agglomerations. The cyclonic mixer includes, a hopper in which at least two conveyors simultaneously transport aggregate streams tangentially into, in opposite directions inducing helical mixing paths. The weighing device including, an aggregate weigher wherein a number of aggregate storage bins selectively releases aggregate onto a variable speed controlled conveyor. Intimately mixed concrete being formed from the simultaneous release of the grout slurry into the cyclonic mixer combining with the mixing aggregate.