Injection grouting is a technique employed to fill cracks, open joints, voids, or honeycombs in concrete or masonry structures. This process involves applying pressure to introduce a grout material that solidifies in place, thereby achieving desired outcomes such as structural reinforcement and prevention of water penetration. Grout, a fluid plastic substance, must possess minimal shrinkage to effectively fill gaps or voids, while maintaining stability without any signs of cracking, delamination, or crumbling. Various types of grouts are utilized for repairing and strengthening concrete and masonry structures. The choice of grout should be determined by its compatibility with the original material in order to ensure optimal results.