Page 366 - Construction Waterproofing Handbook

8.26 CHAPTER EIGHT

FIGURE 8.22 Sealing large cracks with gel before injection.
(Courtesy of Abatron, Inc.)

FIGURE 8.23 Epoxy injection begins at the lowest-elevation
ports. (Courtesy of Abatron, Inc.)

hand, are used primarily for waterproofing a substrate and are not intended for structural
repair. Chemical grouts also allow for future movement at joint locations.
Injection grouts are hydrophobic liquid polymer resins, such as polyurethane formula-
tions. They react with water present in a crack and substrate, creating a chemical reaction.
This reaction causes a liquid grout to expand and form a gel or foam material that fills
voids and cracks. Expansion of materials forms a tight impervious seal against substrate
sides, stopping water access through a joint (Fig. 8.26).