Method of producing concrete

Claim 1

IN A METHOD OF PRODUCING CONCRETE, THE STEPS OF INTRODUCING BETWEEN SUBSTANTIALLY PARALLEL, ANNULAR SURFACES ROTATING RELATIVE TO EACH OTHER AT A PREDETERMINED PERIPHERAL SPEED AND BEING SPACED FROM EACH OTHER AT A PREDETERMINED DISTANCE SO AS TO FORM AN ANNULAR SPACE OF PREDETERMINED WIDTH THEREBETWEEN, IN THE VICINITY OF THE INNER EDGES OF SAID ANNULAR SURFACES, A FLOWABLE MASS INCLUDING AN AQUEOUS LIQUID AND A PULVERULENT HYDRATING BINDER, SAID PREDETERMINED WIDTH BEING EQUAL TO UP TO 10 TIMES THE AVERAGE MAXIMUM PARTICLE SIZE OF SAID PULVERULENT HYDRATING BINDER, AND SAID PREDETERMINED PERIPHERAL SPEED OF SAID ANNULAR SURFACES RELATIVE TO EACH OTHER BEING EQUAL TO BETWEEN ABOUT 30,000 AND 200,000 TIMES SAID PREDETERMINED DISTANCE PER SECOND, SAID FLOWABLE MASS PASSING, UNDER THE INFLUENCE OF CENTRIFUGAL FORCE, OUTWARDLY THROUGH SAID ANNULAR SPACE WHILE SIMULTANEOUSLY THE PARTICLES OF SAID HYDRATING BINDER ARE SUBJECTED TO SHEARING FORCE BETWEEN SAID ANNULAR SURFACE ROTATING RELATIVE TO EACH OTHER; AND WITHDRAWING THE THUS-TREATED FLOWABLE MASS IN THE VICINITY OF THE OUTER EDGES OF SAID ANNULAR SURFACE.