MEASURING METHOD AND MEASURING APPARATUS FOR LOW WATER-PERMEABLE MATERIAL AND WATER-CUTOFF MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a measuring method capable of measuring the water permeability of a low water-permeable material within a rational time range.

SOLUTION: A measuring method for a low water-permeable material consists of one or more main steps for measuring the water permeability of the same sample by a predetermined loading pressure. Each main step includes: a first sub-step for repeating three or more times loading of a sample with a predetermined fixed reference pressure to measure the water permeability of the sample; a second sub-step for evaluating the dispersion of the measurement values of the water permeability measured in the first sub-step; and a third sub-step for adopting a plurality of measurement values as final measurement values when the degree of dispersion of the measurement values in the second sub-step is equal to or less than a reference value, or adopting a higher new reference pressure than the reference pressure of the step when the degree of dispersion is more than the reference value, and determining shifting to the next main step.

COPYRIGHT: (C)2013,JPO&INPIT