The required minimum thickness of heavy vehicular pavers is listed in Section 7.2, but modified in Section 7.3 when chamfers are present. Section 7.3 basically requires the paver to be thicker since the minimum thickness not does include the height of a chamfer. To meet the Type F requirement, a paver with a chamfer would be required to be 2 thick assuming the chamfer is 1/8. Minimum thicknesses are required for interlock and stabilization during traffic movement. The proposal is to make Section 7.3 applicable only to Type F pavers and not Type R. Type F pavers are those set in sand. They need enough surface area to create friction within the joint and therefore create interlock. Type R pavers are set in either a bituminous setting bed or are mortared in place. In those circumstances, additional surface area is not necessary since they dont achieve interlock like a sand-set (flexible) system does. The change would allow a Type R paver to have a chamfer and still be a total of 2 thick. The technical data to support this are the large number of projects that have used chamfered pavers in rigid applications and are performing fine.
Keywordsbrick; fired masonry units; pavement surfaces;
Ballot Item Approved as C1272-2014B and Pending Publication