FIELD: building materials. SUBSTANCE: raw mixture for making of porous filler has, wt.-%: tuff-containing component 99.4-99.7 of the following composition, wt.-%: zeolite 20-40; montmorillonite 45-50; quartz 5-20; calcite 5-15, and silicon carbide 0.3-0.6. Properties of porous filler: filled mass is 225-270 kg/m3, compression strength limit in cylinder is 1,78-2,1 kg/m2, calcination temperature is 1120-1140 C. EFFECT: enhanced quality of filler. 1 tbl
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