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Not sure if this would work but, if you drop in 3' x 3/4 dia threaded rod with bent J end into the slab about every 12" starting 4" from the end, and cap the outside cantilevered end with 1/2" steel plate and tension it after the concrete has fully cured (30days). Possibly would keep it under compression so it will not break off. Pretty sure you want to be near centre of thickness of the slab and at least 2" from the surface, so real tight with 4" slab.
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87 930,
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