DEVELOPMENT OF THE TECHNIQUEFOR INSPECTION AND SIMULTANEOUS REPAIRING OF CRACKS IN CONCRETE STRUCTURES.

点击翻译按钮获取中文摘要

Experiments were carried out to develop a technique for the inspection and the simultaneous repairing of cracks in concrete structures. As results of experiments, the following conclusion can be drawn :(1) Inspection of cracks :A new x-ray technique using a contrast medium was developed for this research. A liquid type contrast medium used in this research also developed. The contrast medium was injected into cracks at the surface of a reinforced concrete specimen. We succeeded to inspect cracks in the concrete under the conditions that the crack width was wider than 0.2 mm and the depth of the specimen was smaller than 25 cm.(2) The technique for inspection and simultaneous repairing of concrete :A test was done to develop a new technique to inspect cracks in the concrete and to repair the cracks simultaneously. The contrast medium was mixed with an epoxy type glue by high speed mixing machine. A bending test with reinforced concrete beam was doen to confirm both abilities of the new contrast medium for crack inspection and crack bonding. The result was satisfactory.(3) Injection test for the cracks at the bottom surface :A test was done to develop an injecting technique for cracks formed at the bottom surface of concrete structures such as a reinforced concrete slab. As a result, it was thought that with the actual method the contrast medium could not reach up to the tip of the crack. More research should be done for this point.