Canada´s National Tower, or CN Tower, as it is better known, is an icon of Toronto, Canada. At 553.3 meters, this communication tower is the second highest building in the world, coming after only the Burj Khalifa 828-meter skyscraper located in Dubai.
Utilized by innumerable companies for the communication of different media, the tower was the solution to the numerous transmission problems that existed before its construction. Before it was built, radio and television signals were obstructed by buildings that were higher than the communication towers then in existence.
Canada´s National Tower
The construction, concluded in 1975, was an ambitious project that involved 1,537 people, working around the clock, five days a week. The tower contains a total of 40,500 m³ of concrete. In 1995, it was classified as one of the Seven Wonders of the Modern World by the American Society of Civil Engineers.
We supplied concrete – Type 1 (normal) and type IV ( low heat of hydrogen – and Portland cements either singly or in combination, as required by weather conditions. Concrete strengths were checked using accelerated strength test by autogenous curing. Excellent control on concrete strength was maintained with 2 days test. Core tests at ages greater than 28 days showed strengths within a range of 6000 to 8000 psi.