Good old fashioned epoxy injection to large separations in old glulam beams. Separations were filled with spackle. This required us to route out joints. We were then able to set surface ports, surface seal, and machine inject.
Epoxy resin: Unitex Propoxy 100 Surface seal paste: Unitex Propoxy 300 Injection machine: Webac
Repairs were sanded and skim coated with epoxy paste to provide a smooth surface.