Using plate dowels that allow horizontal slab movements both perpendicular and parallel to joints lowers the risk of random cracking. This is especially important for slabs that have two-directional doweling or slabs with long joint spacings and significant movements that commonly occur with post-tensioning or shrinkage compensating concrete. On your next slab-on-ground project, consider using plate dowels at construction joints to efficiently transfer vertical loads, maintain vertical alignment of the slabs and help reduce the risk of random cracking.
1. ACI 302.1R-04 Concrete Floor and Slab Construction, American Concrete Institute.
2. Ernest Schrader, "A Solution to Cracking and Stresses Caused by Dowels and Tie Bars," Concrete International, July 1991, pp. 40 -45.
3. Wayne Walker and Jerry Holland, "Plate Dowels for Slabs on Ground," Concrete International, July 1998, pp. 32-38.