RADIOGRAPHY INSPECTION METHOD FOR DETERIORATED STATE OF CRACKS OR THE LIKE OF CONCRETE BRIDGE FLOORBOARD UNDER ASPHALT PAVEMENT

摘要

PROBLEM TO BE SOLVED: To obtain a nondestructive inspection method of the state of cracks, deterioration, damages or the like of a concrete floorboard part which is covered with asphalt. ;SOLUTION: In this inspection method, an X-ray generator, a contrast medium for concrete, an X-ray grid, an X-ray film and an X-ray moving apparatus are used. A hole having a diameter of about 10 mm is bored in asphalt without tearing off the asphalt (2), and a contrast medium for concrete is injected therefrom into a cracked, deteriorated or damaged part of a concrete floorboard (3), and radiography is executed to thereby nondestructively inspect the state of cracks, the deterioration, the damage or the like. By using the method, depth, width, degree or the like of crack, deterioration, damage or the like generated on the concrete floorboard part paved with asphalt can be measured with high accuracy without tearing off the asphalt. Also, since the contrast medium is alkaline, the effect to retard the corrosion of reinforcing steel can be expected by injecting it into the deteriorated/damaged part of the concrete floorboard.;COPYRIGHT: (C)2000,JPO