Recycled raw material for lightweight aerated concrete and manufacturing method of lightweight aerated concrete using this

摘要

PROBLEM TO BE SOLVED: To provide an easy process control without a special measuring device, no special firing equipment, easy quality control, and 10% by mass of a surplus ALC recycled raw material in terms of internal solid content. ALC recycled raw materials that are less susceptible to fluctuations in the amount of recycled raw materials and can stably maintain the same level of compressive strength as conventional products, even if the amount is increased to about 20% by mass, and ALC using this. The subject is to provide a manufacturing method. SOLUTION: A crude powder obtained by coarsely pulverizing excess ALC is heat-treated at 105 ° C. to 300 ° C., and then finely pulverized by a fine pulverizer until the 63 μm sieve residue becomes 45% by mass or less. , And a method for producing ALC, which comprises adding 10% by mass to 20% by mass of the total amount of the ALC raw material in terms of the solid content of the ALC. [Selection diagram] Fig. 1