Dox Plank
Dox Plank
(OP)
Does anyone have any information on a masonry floor system known as Dox Plank?
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RE: Dox Plank
The major problem with Dox plank was that when it came onto the market, reinforcing steel was not yet high strength, and most of the prestressing forces were lost due to concrete shrinkage and other initial losses. The theory was much better than the practice at the time.
Mildly reinforced channel slabs (at that time) were much more durable, and in my opinion more functional, but they lacked the flat soffit of Dox plank.
When extruded (and some wet cast such as Flexicore) plank came onto the market (today's hollowcore plank), at about the same time as higher strength reinforcing, Dox became quickly defunct, as Dox was more costly to manufacture.
If you are looking at a building with Dox plank, it should be analyzed as a mildly reinforced member. If Dox is used on exterior balconies, or any other use exposed to the weather, it is time to demolish them, as the reinforcing is almost undoubtedly corroded severely. Dox plank offered little concrete protection because they were very porous, and allowed considerable migration of moisture, etc.