PREDICTIVE DIAGNOSIS METHOD OF SPALL OF CONCRETE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a predictive diagnosis method for photographing a structure with an infrared camera and quantitatively evaluating a risk of spalling of covering concrete from the structure using the photographed thermal image.SOLUTION: The predictive diagnosis method of spalls of a concrete structure includes: a step 101 of capturing an infrared thermal image of a surface of the concrete structure and measuring an outside temperature in the vicinity of the surface; a step 102 of calculating, on the basis of the infrared thermal image and the measured outside temperature, a detaching-part temperature difference T as a temperature difference between a sound part and a detaching part, and a measurement temperature environment Te as a difference between the surface temperature of the sound part and the outside temperature; steps 103 and 104 of calculating a temperature environment coefficient k as a ratio of the calculated detaching-part temperature difference T to the calculated measurement temperature environment Te and calculating a spall risk Ds according to the temperature environment coefficient k; and a step 105 of comparing the previously-calculated spall risk Ds1 with a currently-calculated spall risk Ds2 to calculate a spall period ts.