I am trying to do a structural repair to a brick wall that has some large gaps - 1-3" between some of the bricks due to some foundation movement over the last 300 years. The gaps are essentially vertical cracks where the mortar has broken loose and the bricks are separating. I know that any foundation movement will cause more cracks but I want to at least stabilize the cracks so that the wall does not collapse. I am thinking that a mixture of something like sand or pea gravel and a strong adhesive will provide the support I need. I have tried Gorilla glue in matrix material but the foaming and expansion just doesn't work well. I think a tube adhesive with a high tensile strength will work, I just have little experience with the new ones out there.
Any ideas or suggestions are appreciated. I always do a "proof of concept" before going full scale so I can try several ideas.