| 摘要 |
A counter weight was manufd. by molding the mixt. of cement and iron powder. Thus, 20-30 wt.% iron powder, 10-20 wt.% cement and small amount of non-shrinkable hardener were stirred and 50-70 wt.% iron scrap was added to the mixt. Then, the produced weight material was molded as well as pressurized to a certain shape and was dried for 3-7 days to give the counter weight.
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