Page 362 - Construction Waterproofing Handbook
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8.22 CHAPTER EIGHT
structural, it is repaired through injection of a low-viscosity epoxy. The epoxy seals the
cracks and restores the monolithic structural nature of a substrate (Fig. 8.18).
High-strength epoxies can return a substrate to its original design strength but do not
increase load-bearing capability. Epoxy used for injection has compressive strengths more
2
than 5000 lb/in when tested according to ASTM D-695.
Injection epoxies are two-component, low-viscosity materials requiring mixing before
application. Low viscosity allows materials to flow freely and penetrate completely into a
crack area. Epoxy used for injection applications has no movement capabilities, and will crack
again if original cracking or movement causes are not alleviated. Expansion and control joints
must be installed if it is determined that cracks may continue to move. Otherwise, cracks
should be treated with a material that allows for movement.
FIGURE 8.17 Cracking of concrete substrate. (Courtesy of Webac)
FIGURE 8.18 Repair of substrate using epoxy injection. (Courtesy of Webac)
