Slab cracking around penetrations

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My foundation is designed with a slab on improved grade, incorporating #3 rebar spaced at 24 inches on center. I am curious whether adding more reinforcement around pipe penetrations in the slab could effectively help reduce cracking. What options would be the most suitable? Would 4x4 steel mesh or diagonal rebar be preferable?

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Although I've already consulted a structural engineer, he seems unwilling to provide guidance, possibly because it's perceived as a non-structural question.

Thank you for your help. I attempted to include a photo for better context.

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