PROPOSAL FOR WATER-PROOF TESTING METHOD OF PLACING JOINT AND CRACKING PARTS OF CONCRETE UNDER HIGH PRESSURE

The water-proof test method of placing joint and cracking parts of concrete under high water pressure is proposed for evaluating the under ground concrete structure. The shape and size of concrete specimen, the high water pressure test apparatus and the leading crack apparatus are developed. The effects of the period of placing joint, the type of water stop material, the kind of waterproofing membrane with cracking at its behind on the water proof performance ware tested under the high pressure.The test results are shown clearly differences in type of material and kind of construction specification. The proposed test method can evaluate the water proof performance of under ground concrete structure under high water pressure.