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the secret for Roman cement?
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Pozzolans, or Pozzolith
Its just a fact of life that concrete cracks.. mesh or reinforcement is used to really control the crack once they inevitably happen..
"Fixing" a crack will never restore the integrity of a monolithic slab... Using low vis penetrating type repair materials and sealers is to control water intrusion into the slab..
Expansion of water during freeze thaw cycles is damaging.. as is water and sodium ions in contact with mesh or reinforcement.. I'm not sure how popular the use of epoxy coated, stainless clad, or stainless reinforcement is, or galvanized reinforcement is in home construction.
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cut the problem section out and pour it again more better.
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The problem with this , is you introduce other weak joints in the slab..to do it properly the cut joints need to be roughed up, coated with bonding agent, and reinforcements doweled and grouted into the remaining slab.. to do it properly is time consuming, and expensive, and has impacts on the schedule..