A suggested retrofit detail for an existing Infill in a URM wall:
Install 3/4" diameter all-thread pins in pairs embedded in epoxy adhesive in
1" diameter holes, the pins of a pair a few inches apart installed at an
angle of about 30 degrees to the surface of the wall so that the pins form a
cross at the center of the wall at the infill/wall intersection plane.
On the other hand, I've designed CMU infills into URM walls without pins [but
not in Santa Ana]. In that detail, bricks are removed from an interior wythe
at the jambs and sill at about 16" to 24" spacing. The Infill is constructed
with open-ended blocks open to the jambs. Grout placed into the open end
cells flows into the voids left by the removed brick to form grout keys.
Pre-hydrated mortar is used to fill the gap between the top of the infill and
the head of the opening. For a 10x10 opening, I'd probably set pins into the
head, but may not if the opening is narrower. I believe that the grout keys
are more effective than dowels because they are more rigid. I specify for
the grout an aluminum powder admixture such as Sika Grout-Aid or PMP Grout
Additive from E-Z Mix. The admixture produces slight expansion of the grout
in the plastic state to compensate for the plastic shrinkage that would
otherwise tend to form a separation between the brick and the grout as it
cures. It is important to saturate the brick before grout placement because
brickwork has a high affinity for water and may dry the grout before it
cures, producing poor-quality keys. Could that kind of detail have been done
on your project?