Grouting is the process of injecting materials into cavities or cracks in concrete, masonry structures, rock-mass, subsurface soil, or rock to increase the structure’s load-bearing capacity, and the material used for this objective is called grout. Grouting is the process of injecting material into cavities or cracks in concrete, masonry, soil, rock-mass to increase the structure’s load-bearing capacity. Learn about different types of grout, their characteristics, advantages, applications and process with examples and diagrams. Grout is usually a mixture of cement, sand, and water or chemicals that are used to fill gaps, often referred to as grouting meaning in construction. They are used in repairing concrete cracks, filling seams and gaps in tiles, gaps for sealing and waterproofing, and for soil stabilization. GROUTING definition: 1. present participle of grout 2. to put a thin line of mortar in the spaces between tiles: . Learn more.