Page 374 - Construction Waterproofing Handbook

8.34 CHAPTER EIGHT

FIGURE 8.36 After a short cure period, leak is effectively stopped. (Courtesy of Vandex)

FIGURE 8.37 Temporary drainage tubes are installed if neces-
sary, to alleviate water pressure during curing of grout. (Courtesy
of Vandex)

The extremely fast initial set prohibits their use over large wall or floor areas. They are
limited to patching cracks or spalled areas that can be completed within their short pot life.

Shotcrete or gunite
Shotcrete and gunite are pneumatically applied small aggregate concrete or sand–cement
mixtures. These are used to restore existing masonry or concrete substrates to a sound struc-
tural condition, waterproofing preparation, or both. These methods are used when areas
requiring restoration are sufficiently large, making hand application inefficient. Pumping and
spray equipment used in shotcrete can automatically mix materials, then pneumatically apply
them to substrates.