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Structural importance of full-depth shrinkage cracks

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I am wondering what happens when a shrinkage crack gets so big that it opens up on the compression face of a suspended reinforced concrete slab.
What happens to the compression zone ?  If there is no contact between the two sides of the crack, and there is no compression steel, then there is no compression.  So the only link over the crack is the tension steel.
That means that the suspended span becomes two cantilevers meeting at the crack, and connected together at the ends of the cantilevers by the tension steel across the crack.
They are not really hinged together, since the tension steel is (probably) ensuring some degree of moment continuity across the crack.
Does that sound reasonable ? 
If that is so, then I guess it is important to inject the crack to restore the compression zone.  Any comments from the concrete specialists ?  It would be much appreciated.

Kevin Below, ing., Ph.D.


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