Injection grouting is a specialized technique that involves injecting a grout material under pressure into the cracks, open joints, voids, or honeycombs of concrete or masonry structures. The grout material used can be either cementitious, resinous, or polyurethane-based depending on the application and desired results. 

The process of injection grouting is typically carried out in two stages: first, a series of holes are drilled at specific intervals along the affected area of the structure. Next, the grout material is injected into these holes under pressure, which then fills the voids, cracks, and joints. As the grout material cures, it adheres to the surrounding structure, creating a strong and durable bond that helps to prevent water intrusion and improve the overall structural integrity of the building.

Overall, injection grouting is an innovative and versatile method that can produce impressive results when executed correctly. If you're looking to improve the durability and longevity of your building, this technique could be a great option to consider.