100-year service life required

Gotthard Base Tunnel

Client AlpTransit specified a service life of 100 years, during which time the concrete and waterproofing systems should require no significant maintenance. The upfront investment made by Sika in the years-long prequalification process and associated development of new materials totaled several millions of Swiss francs. And all this before a single kilogram of construction chemicals was supplied. Aside from having the courage to take entrepreneurial risks, the decision-makers were absolutely convinced that new product solutions could be found to meet the exceptionally stringent technical demands. After a highly selective procedure, the newly developed products underwent rigorous practical tests by official testing laboratories such as EMPA (Swiss Federal Laboratories for Materials Science and Technology) prior to the start of mass production.