Method of testing homogeneity of steel-fiber-reinforced concrete on ready made reinforced fiber concrete structures

摘要

In a series of hardened drátkobetonových test sample (1) on different known concentrations of the wire, with the wires evenly distributed are formed calibration bore (2) of a diameter ranging from 20 mm to 30 mm, into which is inserted magnetic probe. When gradual, continuous extraction probe is read magnetic field strength, yield calibration tables, depending on the intensity of the magnetic field concentration wire. After the testing of reinforced concrete structure (3) in areas of maximum stress in structures and locations that determine the limit state design creates a minimum of three holes (7, 8, 9) with a diameter equal to the diameter of the calibration bore (2). The distance (c) is aligned bore (7, 8, 9) is greater than or equal l.sub.fna less than 2 x l.sub.fn where l.sub.fnje length of the used wire. Do corkscrew (7, 8, 9) introduced successively magnetic probe and in the continuous ejection subtracted intensity of the magnetic field along the borehole depth made (7, 8, 9). The recorded values ​​of magnetic field determines how homogeneity of steel fiber in these places, so comparing the calibration table, the concentration of the wire expressed in kg / m.sup.3.n.nebo volume percentage bracing fibers in hardened steel fiber reinforced concrete in the finished design.