METHOD OF DETERMINATION OF CONCRETE STRENGTH Russian patent published in 1996 - IPC

FIELD: investigation of concrete properties, manufacture of concrete and reinforced-concrete products for determination of strength by nondestructive testing. SUBSTANCE: a specimen is produced. Direct current is passed through the specimen in the process of production. At measurement the specimen is subjected to the effect of magnetic field, having a strength of 3 to 4 A/m. The initial value of voltage at the specimen and the time of its relaxation up to the moment when the voltage becomes equal to 10 to 15% of the initial value are measured. The concrete strength is determined according to the calibration dependence. EFFECT: facilitated procedure. 3 dwg