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Ballast description 3
(1) Earthwork removed during excavation or mining;
(2) Soil containing waste residue.
Judging from the composition of Chinese characters, it is more reasonable to use ballast next to stone characters in engineering; Slag comes from water, which seems to be useless in engineering; According to the dictionary's interpretation of these two Chinese characters, it seems that it is more appropriate to backfill with stone slag, but there are many kinds of ballast used in consulting various hydropower engineering materials, which one should be used needs to be confirmed; In fact, no matter which one is used, everyone knows what it means. Personally, I think it's better to use ballast stones.
Slag-this means that it is not doped with other impurities, even if it is very small.
Slag-slag mixed with various impurities.
Therefore, the word "ballast" is often used in engineering.
For example: railway ballast, that is, the size and specifications of the same material are within the specified range.
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