The durability of shotcrete is equivalent to high-quality concrete. The life span of a new construction shotcrete structure is more than 50 years. For rehabilitation projects, shotcrete can extend the life of a structure by more than 25 years.
Keys to a long-lasting product are 1) proper surface preparation, 2) appropriate aggregate and ad-mixtures, 3) quality of materials, and 4) skilled placement. Be sure your shotcrete contractor has proven experience for your specific situation.