Drinking (Clean) Water Reservoir concrete tank in Streetsville, Ontario, Canada was built in 2011, and Cem-Kote Flex ST waterproofing system was installed Jan-Feb. 2012.
Tank Interior is shown in Figure 1.
The interior walls of the concrete tank were formed using DuPont’s Zemdrain form liners, which results in hard and dense concrete.
The surface of the concrete was cleaned using 35 MPa (5,000 psi) high-pressure water.
Cem-Kote Flex ST was spray applied on the walls and the slab in two coats using a peristaltic pump, as shown in Figure 2. Each coat was brushed to achieve membrane continuity.
The columns of the structure were also sprayed and brushed with two coats of Cem-Kote Flex ST.
The application was carried to a water saturated concrete, and in wintertime with minimum heating.
Pull-off bond strength tests were carried out by an independent laboratory by attaching steel targets (discs) to the surface of applied Cem-Kote Flex ST using an epoxy and pulling off the disc. The adhesively fastened discs are shown in Figure 3.
The actual bond strengths of Cem-Kote Flex ST to concrete exceed the minimum specified bond strength under wet conditions.
Tank inspection was carried out in March of 2016 and Cem-Kote Flex ST was in perfect condition, with only a few minor spots requiring maintenance.