The degree of saturation after drainage of Nickel Slag is clearly different from those of other samples. It can, therefore, be said that materials can be explicitly categorized into two groups, i.e., materials which may liquefy and materials which are not liable to liquefy, based on the degree of saturation after drainage in the Liquefaction Potential Test. Consequently, the results of the tests indicate that the proposed Liquefaction Potential Test can be utilized to judge the liquefaction potential of solid bulk cargoes. It can be concluded that the criterion for the judgment, i.e., degree of saturation after drainage 70 %, is reasonable.
5 Permeability Test
5.1 Outline of the test procedure
Permeability is one of the essential properties related to the characteristics of liquefaction. Permeability of each sample was measured by Japan for reference, based on JIS A 1218, 1998, "Test methods for permeability of saturated soils". The test was carried out under "Constant Head" condition as illustrated in Figure 6.
Fig. 6 Permeability test
The bottom of the mould has many holes. We attached the metal mesh only at the bottom of the specimen. Porous stone and filter paper were not attached at the specimen to avoid the effect of these materials on permeability measurement. Specimen was formed with dry sample by compaction in accordance with the relevant part of Proctor/Fagerberg Test Procedure and void of the specimen was filled with water from the bottom. The test procedure was as follows:
(1) Set up the mould using "O ring" and put the metal mesh, of which the mesh size was 106 micro-meter, at the bottom of the mould;
(2) Weigh the mould without extension collar (tare weight);
