We're currently working on a development site in my local area where concrete pavement seems to be the best course of action to provide a cost effective and sustainable long term driving surface for large vehicles (City Buses).Our geotechnical engineer has provided us a report including design recommendations given the existing subsurface characteristics of the site. The design recommendations call for 6" thick 4000 PSI concrete underlain by a sub base layer consisting of 8" of VDOT 21A aggregate compacted to 95% std. proctor maximum dry density; the concrete will be properly air entrained to account for freeze thaw and deicing chemicals. The maximum contraction joint spacing is indicated to be 15 feet with contraction joints minimum 1.5" in depth. The contraction joint pattern should be relatively square with the length of any given panel not exceeding 25% of its width. Further, the report states: "Typically, if the maximum joint spacing does not exceed 30x the slab thickness up to 15', then the concrete pavement may remain unreinforced." The report also indicates that steel reinforcement is not required for their design, but that steel may be incorporated if concerns remain regarding shrinkage cracking.I'm writing in hopes of gaining further knowledge about the potential mitigation of shrinking cracking between contraction joints. In the past we've included rebar mats within the section and in the top third of the concrete thickness and more recently we've designed and oversaw a concrete pavement with steel fibers. The steel fibers were very interesting to us. Our firm did not seal the design mix with the fibers; the supplier's professional engineer signed and sealed the mix to be equivalent to our design with rebar mat.Any knowledge or resources you can point me to regarding the use of steel in concrete pavement would be greatly appreciated. Thanks in advance for anything you can offer.