What is the strength of shotcrete?

Shotcrete is generally stronger than poured concrete because the method of pneumatically applying concrete reduces the water-cement ratio. Shotcrete typically reaches a strength of 3,000 psi in 24 hours or less, and a 28-day strength of 5,000 psi or greater. Ad-mixtures, such as silica fume, can increase the strength to as much as 8,000 psi.