INJECTION GROUTING This is a process of filling cracks, voids of honeycomb between wall layers. This re-strengthens the damaged part of the structure. Grout is a liquid based flow able material of negligible shrinkage used to fill the voids between wall joints or cracks with the use of pressure. Different types of grout materials are used in different cases depending upon the original wall material and the nature of the surrounding walls.
TYPES Of GROUTING
- Polymer Polyester, Epoxy, Vinyl-ester, Polyurethane and Acrylic resins – used for Anti seepage, underground structures.
- Fiber-reinforced polypropylene, Steel or Glass fibers mixed with Portland cement – enhances flexural strength, impact resistance and ductility of the wall.
- Cement – sand Most popular grout due to low cost and availability. Not very effectively strong.
- Gas-forming- Aluminum and Carbon powder based grout with the cement liquor – The gas formed due to material reaction pushes the grout mixture into unreachable cracks. Very fast Process- experts only.
- Sulfo-aluminate Anhydrous (containing no water) sulfo aluminate mixed with Portland cement – injected into walls. This method requires water curing (wetting the wall) after hardening. The mixture then expands and fills all voids. This method is better than gas forming because it’s easy.