10 hours ago
Sunday, December 5, 2010
Going up - walls
Concrete is a great material under compression, immensely strong when properly supported. But it doesn't do well under tension -- when it gets pulled. So adding steel rebar allows the concrete to resist cracking and spreading. In this project, the floor is tied to the walls with rebar, and the walls are reinforced with it to allow it to resist any cracking or spreading.
The concrete walls that I'm pouring are overbuilt for the load that I'll eventually put on them. they're 8" thick; but the increased cost from 6" to 8" is a couple of hundred bucks of concrete, and having it be tougher and heavier duty than needed means that there is no chance of damage in the event of the eventual flood.