Foamed concrete structures

Claim 1

A CELLULAR CONCRETE STRUCTURE COMPRISING A CONCRETE MATRIX HAVING SUBSTANTIALLY HOMOGENEOUSLY DISPERSED THERETHROUGH A MULTIPLICITY OF SPHERICAL VOIDS OF ABOUT 0.005 TO 0.050 INCH AVERAGE DIAMETER AND OF RELATIVELY NARROW SIZE DISTRIBUTION, SAID CONCRETE MATRIX COMPRISING CEMENT, A FOAMING AGENT, AND A CHLORIDE CURE ACCELERATOR, SAID STRUCTURE HAVING A UNIFORM DENSITY OF ABOUT 25-75 POUNDS PER CUBIC FOOT SAID STRUCTURE HAVING BEEN PRODUCED BY A PROCESS COMPRISING THE STEPS: A. ADMIXING WATER AND CEMENT UNDER CONDITIONS SUFFICIENT TO PRODUCE A HIGH DEGREE OF HYDRATION OF THE CEMENT PARTICLES; B. INTRODUCING INTO THE HYDRATED CEMENT ADMIXTURE OF FOAM FORMED UNDER PRESSURE FROM A MIXTURE OF WATER, AIR, FOAMING AGENT AND A CHLORIDE ACCELERATOR IN A WEIGHT RATIO TO CEMENT OF 0.0035 TO 0.01*1.0; C. BLENDING SAID CEMENT ADMIXTURE AND SAID FOAM MIXTURE SUFFICIENTLY TO PRODUCE A SUBSTANTIALLY HOMOGENEOUS FOAMED CEMENT SLURRY; D. CASTING SAID CEMENT SLURRY INTO A MOLD; AND E. CURING SAID CEMENT SLURRY TO FORM SAID LIGHTWEIGHT CELLULAR CONCRETE STRUCTURE WITH SAID CHLORIDE ACCELERATOR BEING CONCENTRATED AT THE SURFACES OF THE CONCRETE MATRIX ABOUT THE VOIDS.