DETECTING METHOD FOR BREAKDOWN OF CONCRETE STRUCTURE

PURPOSE:To detect the breakdown of a concrete structure beforehand and also, to curtail the cost by always measuring a minute magnetic field generated from a magnetic cement concrete part by a superconductive magnetic sensor. CONSTITUTION:In a column 1 of a concrete structure, a magnetic cement concrete part 2 is installed in the center axis in which this column 1 receives a load and receives a large stress, and column concrete is placed. After the placed concrete is hardened and a form is removed, a magnetic field at the time of a stress state of a usual time is measured by a magnetic sensor SQUID 3 by utilizing a superconductive phenomenon. Subsequently, by collating a result of measurement shown in A of the figure, and a magnetic field pattern B immediately before a breakdown which has been measured by manufacturing a specimen in advance, and a magnetic field pattern C after the breakdown, and knowing beforehand the breakdown of the concrete column 1, its safety degree is checked.