METHOD AND APPARATUS FOR MANUFACTURING CONCRETE PRODUCT Russian patent published in 1997 - IPC

FIELD: manufacture of building materials. SUBSTANCE: method involves electromagnetic treatment of put into model and compressed concrete mortar, which is performed by effecting hardening concrete with alternating current with industrial frequency and voltage up to 1000 V and constant magnetic field with intensity up to 100 Oersted generated by alternating current voltage. Apparatus has a model, its walls being electrodes connected to alternating current source, set onto magnetic conductor and connected in parallel or in antiparallel to direct current source of bobbin. Magnetic conductor has a special cut to instal the model. EFFECT: increased strength of concrete product. 3 cl, 2 dwg, 2 tbl