Page 370 - Construction Waterproofing Handbook

8.30 CHAPTER EIGHT
with water injected for testing to ensure that grout will penetrate properly. Port spacing
along cracks varies, depending on crack size and manufacturer recommendations. Spacing
varies from 6 to more than 24 in (Fig. 8.29).
In smaller cracks it is not necessary to surface-seal crack faces. However, on large
cracks, temporary surface sealing with a hydraulic cement-patching compound is neces-
sary to prevent unnecessary grout material waste. As with epoxy applications, begin at the
lowest port; grout is injected until it becomes present at the next higher port. This process
is then moved to the next higher port (Fig. 8.30).

FIGURE 8.29 Chemical grout injection. (Courtesy of Webac)

FIGURE 8.30 Injection of grout starting at lower ele-
vations. (Courtesy of de Neef Construction Chemicals)