Most of the flatwork in our area eventually develops cracking across the comers and parallel to the joints. The cracks become more numerous as time goes on. The general attitude is that this is normal and nothing can be done about it, but I don't see this kind of cracking in many other parts of the country that I visit. What's the secret?
The problem is undoubtedly what is known as D-cracking, which is common in Ohio and some Midwestern states, which includes your area. It is associated with certain kinds of aggregate. A number of things can be done to minimize or eliminate the problem, including use of a smaller maximum size of aggregate and providing a drainage system below the flatwork to keep the slab drier. Your state highway department may be able to provide test data that will offer guidance on the selection of the maximum size advisable to use from a given aggregate source. Although entrained air does not protect the aggregate in concrete, air entrainment may provide protection to the cementitious portion of the concrete, which might otherwise deteriorate more rapidly in a concrete containing an aggregate that is susceptible to D-cracking behavior.