Page 339 - Construction Waterproofing Handbook

ADMIXTURES 7.7
no special primers. If a stiff mixture is required for application to sloped areas such as
ramps or walls, a thin slurry coat of material is brush-applied before the final application
of the overlay (see Fig. 7.1).
These products are not applicable in freezing temperatures, and are not designed as pri-
mary waterproofing materials of a building envelope.

WATERPROOFING SYSTEM COMPATIBILITY WITH ADMIXTURES

Admixtures are intended to directly impact the hydration process of curing concrete. Since
most waterproofing systems are designed for installation over regular concrete mixes, it is
mandatory that any intended use of admixtures with a waterproofing system be investigated
for compatibility.
Most admixtures significantly reduce the size of capillary void sizes within the cured
concrete product. Since many of the available concrete waterproofing systems, used both
above and below-grade, require the capillary voids in order to deposit or grow chemical
formulation to repel water, the reduction of capillary size can adversely effect water repel-
lency or waterproofing of the concrete.

FIGURE 7.1 Polymer concrete overlay application to existing parking deck. (Courtesy of Coastal
Construction Products)