Method for the manufacture of steamcured light-weight concrete products

Claim 1

A METHOD IN THE MANUFACTURE OF STEAM-HARDENED CELLULAR CONCRETE PRODUCTS COMPRISING THE STEPS OF PLACING A MOLD IN A CHAMBER, PREPARING A FOAMED LIGHT WEIGHT CONCRETE MASS BY INCORPORATING GAS BUBBLES THEREIN, CASTING SAID FOAMED CONCRETE MASS IN SAID MOLD, LOWERING THE PRESSURE IN SAID CHAMBER TO A VALUE SUFFICIENT TO CAUSE SAID GAS BUBBLES IN SAID CONCRETE MASS TO EXPAND WITHOUT DISAPPEARING FROM THE MASS, MAINTAINING A NEGATIVE PRESSURE IN SAID CHAMBER UNTIL SAID EXPANDED MASS HAS SOLIDIFIED SUFFICIENTLY TO BE SELF-SUPPORTING, THEN ADMITTING STEAM INTO SAID CHAMBER UNTIL SAID EXPANDED MASS HAS SOLIDIREMAINING STATIONARY DURING THE WHOLE PROCESS, AND FINALLY TAKING OUT THE HARDENED CELLULAR CONCRETE BODY FORMED BY SAID EXPANDING MASS FROM SAID CHAMBER AND MOLD.