The GO Transit Authority is meeting the transportation needs of Toronto’s growing population by creating a grade separation at Strachan Avenue. The rail corridor will be lowered as much as 26 ft (8 m) below Strachan Avenue. In order to accomodate the lowered rail line, a 1 mile (1.5 km) long sewage tunnel was also moved down. In the first phase of the project, the team used a surface-applied system to dampproof the sewage tunnel. For the next phase of the project, the team added Kryton’s Krystol Internal Membrane (KIM) concrete dampproofing admixture to the concrete mixture, thus eliminating the step of applying a surface applied system. Approximately 4000 yd3 (3000 m3) of KIM treated concrete was used in the construction of the sewage tunnel. Kryton’s Krystol Waterstop System for joints was also used in the tunnel and the tunnel ventilation shafts at Strachan Avenue.
Source: Concrete International
