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Yellow pine is susceptible to moisture. Several years ago I had a yellow pine floor that got wet. It basically went crazy and buckled (I had to replace it). I would guess that it was not properly dried (cured) before installation, or that there is a moisture problem in the house.

Thanks for you insight. The "float" of the top forms is due to liquid head of the concrete. We have assumed that this is 2000 psf (based on height and pour rate). The 5% friction is a different matter that defines the amount of "thrust" or longitudinal load in the form system. This is the...

Thanks for responding. I will try to simplify. Concrete formwork at 45 degree inclination has 70.7% of the concrete load acting normal to the formwork and 70.7% of the load acting parallel to the form work. A large portion of the load acting parallel to the formwork goes directly back to the...

I am checking the design of a form traveler system for a large cast-in-place concrete box girder arch structure. The initial inclination of the arch is 45 degrees from the horizontal. I am trying to determine a reasonable and hopefully accurate estimate of the friction between wet concrete and...