FIELD: manufacture of building materials. SUBSTANCE: structural member consists of shell of solid material and core of porous material. Block is made of fine concrete with shell thickness equalling 0.1-0.3 of core thickness and shell-core density ratio of 7:1-2:1 and volumes of entrapped air in them of 1-8% and 55-85%, respectively. One of longitudinal walls of shell on upper plane has grooves. EFFECT: simplified technology of manufacture with provision of high warmth-keeping and strength properties. 2 cl, 4 dwg
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