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Field measurements of thickness of a polyurethane membrane applied on an actual building by four kinds ofmeasuringmethods such as ultrasonic wave measuring, eddy current measuring, needle penetration and direct measuring of cut-out specimens were first carried out, and the advantages and disadvantages of each method were discussed. As for the technique to collect a cut-out piece from a membrane, a new one of capable of reliably collecting using a punch of 10mm in diameter was developed. The specimens of various compositions and wide rage of thickness were prepared and their thickness measured carefully in a laboratory, and the accuracy of thickness by each measuring method was discussed. Finally the suitable combination between various thickness measuring methods and polyurethane membranes of different thicknesses and compositions was proposed.

RESEARCH ON CHARACTERISTICS AND RELIABILITY OF VARIOUS METHODS FOR MEASURING THICKNESS OF POLYURETHANE WATERPROOFING MEMBRANE