06-02-2015, 09:33 AM
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#8
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Yurt Forum Addict
Join Date: Nov 2013
Posts: 2,187
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Re: Yurt platform post holes
I'm no concrete pro. My comments are based on my limited personal experience digging piers and postholes at work for decks, fencing and my own yurt. Furthur, I'm not a soils engineer. And I'm not there to see your project.
The sontube I'm familiar with is wax coated on the inside. If concrete can cure in water, I'm thinking that after the initial set in ~ one day I'm -guessing- there won't be a problem with just placed mud eroding away. I don't think a sonotube would degrade to point of exposing contents to ground water in a days time. It's all a guess. We have a dry climate here and I've never dealt with any real water problem when digging piers.
I've heard of hydraulic cement, but that's it. I know absolutely nothing about it.
Water at foundation is definitely problematic. If you have a hole or holes that are rapidly filling with water, try ditching and daylighting, or pumping it out. If there is ground water flowing towards the pier holes, try diverting it.
Quick story about this issue. Martina Navratilova built a mansion up near Aspen CO in the early 90s. A couple friends and I were camping up by Maroon Bells and we went by to see it. It was under construction, but the place had a 'stop work' order. The foundation was completed. The ~15K foot home was framed and the mechanicals were well underway.
A lawsuit was in progress. Why? Well the architect had deliberately sited the residence in the direct path of a natural mountain stream, so as to use the stream for landscaping around the back and side of the house! Basically the stream pointed at the center of the foundation on the uphill side. They had diverted it for construction. IMO this was really foolish. The concrete foundation had bowed in so badly on the side facing the stream it had caved in and developed cracks you could stuff a cat into. Construction came to an abrupt halt.
Just sayin. Best to give your yurt site serious consideration before spending hard earned money. I'd absolutely get the opinion of some concrete pros in there, and any friends that are in construction trades as well. Good luck.
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