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- To: SEAOC(--nospam--at)seaoc.org
- Subject: More on Spun Concrete
- From: Tom.Hunt(--nospam--at)fluordaniel.com
- Date: Fri, 9 Jan 1998 8:10:00 -0500
I spent a week at a precast shop in Bangkok where we were having 16 inch square prestressed piles and some prestressed AASHTO bridge beams manufactured and this shop also fabricated spun concrete piles. The process was similar to what was described previously for the spun light poles. Spun hollow piles seem to be very popular in Asia. The rebar cages are placed in the split metal forms and a predetermined amount of concrete is poured in. "Poured in" is actually not a good description since this concrete has such a low water/cement ratio it looks like someone forgot the water. This is true no slump concrete. The forms are closed up and the entire tube is slowly spun to distribute the concrete. After several minutes they crank it up to a very high speed for a short duration. Even with such a low water/cement ratio, water actually trickles out the ends during the high speed spinning. After spinning and opening the metal form the concrete pile is so stiff and dry that it can be immediately handled as if it had already completed it's set. I would expect that this process produces a very dense concrete and an efficient cross section. The only problem I saw was that the piles can only be made in the length of the metal form. If you need longer piles you would have to splice them together somehow. This was one reason we went with the solid square prestressed piles since they can be made to almost any practical length. Thomas Hunt Fluor Daniel
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