TWO-LAYER BUILDING PRODUCT, METHOD AND CONCRETES FOR ITS MANUFACTURE Russian patent published in 1994 - IPC

FIELD: designs of two-layer building products. SUBSTANCE: two-layer building product including external decorative and internal structural layers from close-grained concrete with internal reinforcing cage accommodated in structural layer provides for use of close-grained concrete of decorative layer containing cement, microsilica, quartz sand of 0.3-5 mm fraction, wastes of crushing of flaky basalt and colored granite in ratio of 1:4 of 0.14-5 mm fraction, superplasticizer C-3 and water, and close- grained concrete of structural layer contains cement, microsilica, quartz sand of 0.5-2.2 mm fraction, wastes of crushing of flaky basalt of 0.14-5 mm fraction, superplasticizer C-3 and water. Reinforcing cage is made of rods, and, at least of two strips, to which mounting free lengths are rigidly secured. Method provides for placing of setting retarder onto bottom of mold, concrete mixes of decorative and structural layers, installation of internal reinforcing cage, compaction, thermal treatment, cooling and opening of internal surface texture. Decorative and structural concretes may be used separately. EFFECT: higher efficiency. 8 cl, 1 dwg, 2 tbl