| 简介 |
PROBLEM TO BE SOLVED : To provide an evaluation method capable of simply and surely evaluating the mixed degree of a mixture, acquired by mixing a granular material of mixed earth and sand.
SOLUTION : Earth and sand are mixed with a coal ash granulated material. The total mixing ratio is calculated from the mass of both the mixed materials. Then, a sample is collected from the mixture, and either underwater sieving or underwater specific-gravity difference separation is selectively used, according to the difference between both particle sizes, to thereby separate the coal ash granulated material in the sample from the earth and sand. The mixing ratio of the coal ash granulated material is calculated. Then, a sample is re-collected from another location of the mixture, and the mixing ratio of the coal ash granulated material is calculated; each sample is collected from five spots in total; and each mixing ratio is calculated. Dispersions of the five mixing ratios are expressed by standard deviations, to thereby evaluate the degree of uniform mixing degree.
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