Density of creosote treated timber
Density of creosote treated timber
(OP)
What is a good value to use for the density of existing (30 yr old) creosote treated railroad ties, beams, piles, etc?
Thanks in advance.
Thanks in advance.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Density of creosote treated timber
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RE: Density of creosote treated timber
RE: Density of creosote treated timber
I think I'll start with 60 pcf... unless someone has a reference otherwise.
The contractor will know with the first pick how close we estimate. We can always bite off smaller chunks if the actual timber is heavier.
RE: Density of creosote treated timber
RE: Density of creosote treated timber
For lumber, about 10 lb/ft3.
Piling & structural timber, 12 lb/ft3 (freshwater) and 20 lb/ft3 (saltwater).
In practice, 20 lb/ft3 was almost impossible to reach. Many specifications would permit creosote retention of be "refusal" which was realistically about 18 lb/ft3.
Since southern pine has an accepted density of 45 lb/ft3 (more or less, explaining why some creosoted members would float and others sink) plus adding the retained creosote, I consider your 60 lb/ft3 estimate to be a reasonable conservative upper limit for (random) 30 year old members. Maybe a little less (say 55 lb/ft3) if there are few piling/structural timbers.
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RE: Density of creosote treated timber
Geometry ended up governing... cutting the bridge into truck bed sized pieces. Our weight estimates could be off significantly and the rigging and crane they plan on using will be fine.