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Old April 6, 2013, 11:18 AM   #20
4V50 Gary
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Join Date: November 2, 1998
Location: Colorado
Posts: 17,048
How about concrete filled? There are fibers you can add that improve the strength; that and tossing in copper, ball bearings and other pieces of metal would make increase its cut resistance (since they'll dull the blade and require change of blades).
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