Page 376 - Construction Waterproofing Handbook

8.36 CHAPTER EIGHT

FIGURE 8.38 Application of overlay prior to waterproofing
application. (Courtesy of Devcon)

electrodes) installed into the concrete substrate. A negative electrode (cathode) is installed
into the adjacent surrounding soil. The flow of current causes the water to flow away from
the interior of the structure back towards the exterior. A schematic diagram of the system
is shown in Fig. 8.39.
The process works for both reinforced and nonreinforced concrete, and is very effi-
cient in improving air quality by substantially reducing humidity in basement areas. The
system can be an effective remedial means to eliminate water infiltration into basement
or below-grade structures without having to expend money for excavating and repairing
or replacing existing waterproofing membranes. The operating costs are relatively low
since it operates on 110-volt power.

Installation
All obvious cracking and free flowing leaks should be repaired using chemical grouts. Any
structural repairs necessary might require epoxy injection. A cathode (copper-clad steel