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In order to understand the characteristics of pumice sand, we scanned pumice particles using micro X-ray computed tomography (X-ray CT), which showed that pumice particles have not only surface voids but also internal voids. Therefore, pumice sand is lighter than quartz sands and also is crushable. In addition, from our previous research, the relative density of pumice sand can not be estimated from conventional CPT testing. Because of this unique behaviour, there is a need for more experimental study of this material to fully understand its geotechnical properties. First, we performed hydrostatic compression tests on loose pumice sand and monitored the volume change with elapsed time during loading and unloading. After these tests, the particle-size distribution (PSD) was measured. Second, in order to distinguish the differences in stress relaxation between loose and dense sand which might occur during CPT testing, Ko compression tests were performed at various displacement rates, from 0.5mm/min to 25mm/sec. The final compression was about 33% of the original length of the specimens. After compression, the maximum displacement was held constant for a specified period of time and the relaxation of the axial stress was monitored during this time. From these results, the stress relaxation of loose sand was slightly larger than that of dense sand, presumably because loose sand has more spaces for rearrangement of particles during the stress relaxation process.
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