Tablet resetting

A tablet is a tombstone that looks like a slab of stone, think Ten Commandments in Moses; slabs of stone that vary in size with an inscription carved onto them.  Material used for tablets included, wood( usually only seen museums), slate, limestone, marble, and sandstone. Slate tablets in Indiana are rarer than it's contemporary counterparts.  Limestone was readily available in central Indiana.  Sandstone usage here in central Indiana is rarer than limestone and marble usage.   Marble is the most widely used tablet stone used here in central Indiana.  You find white marble and the veined marble varieties.  Tablets were first used as a marker that was just stuck in the ground.  These are usually rough hewed under the soil line, but not always, as our project has discovered.  The ones that are set in ground can be very long with only the inscription area showing above the soil line.  You then find that some of the white marble type tablets begin to be mounted in  limestone bases.  These tablets were mortared into the slot, so if something happened to loosen the stone the tablet would pop out of the base.  During the Great Depression the WPA was hired to do a number of infrastructure projects; one of these being cemetery maintenance.  During this time period, fallen tablets started to be reset directly in concrete.  At the time people thought that this would be a permanent fix, but concrete and stone do not mix. Being that concrete is harder than stone; the result of this is that the stone is what suffers; cooling, heating, stress can all make the stones fracture off the concrete base.  Since concrete is harder; it is the stone that breaks, typically at the bottom where it was set into the concrete.  So what will our project do in resetting tablets.  Tablets that go directly into the ground and they are still intact will be straighten only.  Those that are down and need to be reset, because of a concrete base fracture, a new base will be poured.  It will contain a slot for the marble stone.  Then the tombstone will be reset into the slot with a mortar mix. If something does every happen; then the stone will be able  to come out of the base without any more damage to the stone.