the test was determined as 30 minutes (refer to step C-3).
2.4 Results of the liquefaction potential test
The results of the tests for slags. of which the grain size distributions are presented in Figure 3 and 4, are shown in Table 1. It is clearly shown that there is a close correlation between D10, and degree of saturation after drainage.
Four materials of which the FMPs were measured were tested by the procedure to confirm the consistency The results are shown in Table 2. The FMPs in the table are listed as reference. Because the amount of drained water from these materials was little and the degree of saturation after drainage remains high, all tested materials were judged as materials which may liquefy, based on the proposed criterion. It is concluded that the proposed procedure is consistent with the procedures for determining TML in the BC Code.
2.5 Range of application of test result
From the view point of production process, it is natural that a test result for a material is applicable to those which satisfy the condition presented in paragraph 3.4 (i) of ANNEX 1
Because the result of liquefaction potential test is affected by solid density and D10 of the material, the criteria of these properties should be defined in order to clarify the range of application of the test result.
2.5.1 Criterion of solid density
To investigate the criterion of solid density, Nickel Slag and Copper Slag were sampled ten times intermittently in one factory, respectively. The average of solid densities of the samples of Nickel Slag was 3,029 kg/m the standard deviation was 12 kg/m which is around 0.4 % of the average. These values of Copper Slag were 3,627 kg/in 19 kg/in 0.5 %, respectively.
It is deemed appropriate to assume that the distribution of the solid density of each material is a normal distribution expressed by N(七ｴ.&). where 七 denotes the average and ｴ denotes the variance. In this case, the distribution of the difference between two values also becomes a normal distribution expressed by N(0. 2ｴ). Therefore, 95 % of the difference between the two values will be in the range ｡疝.96｡ﾟ21/2ｦﾒ -｡ﾞ2.8ｦﾒ The ranges are ｡ﾞ1.2 % and ｡ﾞ1.4 % of the averages for Nickel Slag and Copper Slag, respectively. Then difference in solid density in these ranges can be regarded as insignificant. Thus, the criterion of solid density is defined as presented in paragraph 3 4 (ii) of ANNEX 1.
2.5.2 Criterion of grain size distribution
It is clear that the material of larger D10 can contain less moisture and is less liable to liquefy.
Thus, the criterion was determined as presented in paragraph 3.4 (iii) of ANNEX 1.
3 Criteria of grain size distribution on liquefaction potential
3.1 Parameter of grain size distribution
From the view point of permeability which is a dominant factor of liquefaction. it is appropriate to define the criterion based on effective size D10.
3.2 Maximum grain size
Although the effect of large lumps in solid bulk materials on liquefaction potential is not dominant, grain size distribution of a material heavily depends on containment of large lumps.
Prior to determination of the criterion based on grain size distribution, maximum grain size should be limited.
Considering that the diameter of the vessel for the liquefaction potential test is the same as that of the small vessel for the Penetration Test and that the maximum grain size for the
