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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT - High-mix and low-mix concrete
I just finished a book describing the building
of Boulder Dam, and there's something I don't understand. The book mentioned that two concrete batch plants were made, one to product "low-mix" concrete for the lower portions of the dam and another to produce "high-mix" concrete for the top. The two plants were not run at the same time. Any ideas as to why they needed two separate plants and what the difference in the concrete was? |