Posted by Billy NY on September 22, 2011 at 11:36:40 from (74.67.3.54):
In Reply to: can you join cement posted by carogator on September 22, 2011 at 10:05:00:
You can join or should I say, "tie in" concrete using epoxies, deformed metal bars (rebar) on or in existing concrete, but its not "monolithic" (one) in a manner of speaking, as their is a joint, both are not formed and placed at the same time.
You propose to form and place a spread footing for a wall, typically the footing has a key way and vertical rebar to accept the wall, to tie it in to the footing. Not so typical is what you are considering, tying a slab edge to a footing.
Most footing, wall and slab details, (looking in section) will show the wall as described above, with the slab edge on top of footings, independent of the footing and wall, (not tied in). Columns, or posts in this case may have footings, set under the slab, both are also typical to have an isolation joint, using expansion joint material, like asphalt impregnated fiber strips, board, or whatever is the latest material for that purpose. All the structural steel buildings I've worked on had column isolation joints, I believe to eliminate cracks projecting from sharp corners. I don't ever recall seeing a slab edge tied to a footing on any building I've worked on or blue prints with wall/footing/slab details. That is not to say its wrong, but definitely a non typical detail. I would think the slab being independent of the wall would prevent any wall settlement from influencing or imposing forces on the slab edge.
Highway slabs are adjoined to one another, if you have ever seen new concrete highway pavement installed, where they leave off always has the leading edge with epoxy coated rebar protruding, to tie into the next slab when placed. Typically done like this in these areas, NY NJ metro areas as I recall.
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