Abstract
A new simplified test method using a small cylindrical specimen which enables us to conduct a test in a laboratory has been proposed for bond strength of patching repair material hardening under vibration. Among the existing test methods to examine the effect of vibration on the bond strength development of patching repair material are the test method using a large specimen modeling an actual concrete structure and that using a moderate size specimen attached to an actual concrete structure. Those test methods are all of large scale and difficult to conduct in a practical testing environment. Therefore, a simple and handy test method for this purpose has been desired to be developed. For this purpose the authors have developed a test method using a small specimen（length 530mm, width 150mm, height 120mm）with the patching repair material zone（length 400mm, width 150mm, height 30mm）. The specimen is subjected to sinusoidal vibration with amplitude 0.5mm and frequency 5Hz for 24 hours after placing the patching repair material by spraying.
In this study a further simplification is examined to the test method previously proposed by the authors. Two kinds of vibration effects are examined. The first one is for the repair of the bottom surface of the structure, and the second one, for the repair of the side surface of the structure. The premixed type polymer mortar is used for a patching repair material. The water-patching repair material ratio is 13.4％. In the present simplified test method a cylindrical specimen（total length 80mm, diameter 50mm, length of patching repair material 30mm）is given the vibration effect by applying impact to the specimen as many times as the equivalent number of dropping which has been determined for the bottom and side surface repair methods based on the experimental data. A summary of the present test method is given as an appendix.
