What is stronger gunite or shotcrete?

Gunite generally lasts longer and maintains a higher quality than shotcrete. Gunite can also withstand up to 9500 psi, a much higher psi than shotcrete. If you expect your pool to have to withstand a large amount of pressure, gunite is the better choice.

Do you need rebar in a pool?

Rebar is important because it adds strength to in-ground swimming pools. Rebar is reinforcing steel that is used to give support to a concrete structure. Rebar is one of the most important materials required for the construction of any type of swimming pool.

How do you mix shotcrete?

The mix proportion of shotcrete (cement : sand : stone) is usually tested by empirical method and modified by real measurement. The common mix proportions include: 1 : 2 :2.5, 1 : 2.5 : 2, 1 : 2 : 2, and 1 : 2.5 : 1.5 (mass ratio). If the cement quantity is 300 ~ 450 kg/m3, the water-cement ratio should be 0.4 ~ 0.5.

How thin can shotcrete be applied?

Thicknesses depend on the structure and surface (surface prep is the key to proper bonding of shotcrete) the shotcrete is being applied to. Depending on the application 1/4 flash coat to 1 inch thickness can be the minimum.

Why is shotcrete used?

A. Shotcrete is a method of applying concrete projected at high velocity primarily on to a vertical or overhead surface. The dry-mix shotcrete process adds water to the mix at the nozzle. Shotcrete is used in new construction and repairs and is suitable for curved and thin elements (ACI 506R).

What’s the difference between a shotcrete and gunite pool shell?

Shotcrete is pre-mixed, wet concrete that is pumped through a hose, whereas Gunite is a dry mix pumped through the hose that is met with water at the end. A gunite pool shell is harder to shoot, as it takes a more skilled team and nozzleman.

What kind of concrete is sprayed in a swimming pool?

Sprayed concrete was developed as a construction solution for tunnels, underground structures, slope stabilization, structural repairs, and swimming pools. The process involves a mortar or small-aggregate concrete that is sprayed with air power onto surfaces at a high velocity.

Can you use shotcrete to repair concrete joints?

Concrete joints should be designed as if you were placing regular concrete. Shotcrete can be used to repair existing concrete without the need to have a bonding agent applied to the surface being repaired. Sprayed concrete must be cured just like poured concrete.

What’s the best way to use wet mix shotcrete?

It is the recommended method when the process involves frequent stops during the application process. Wet-mix shotcrete uses fully mixed concrete and sends it through a hose and nozzle without additional water.

Is there an alternative to shotcrete for structural repair?

There is a thinner and lighter alternative to shotcrete. This alternative began in Europe and is gaining traction in the United States and Canada. Fabric-reinforced cementitious matrix (FRCM) is conceptually similar to shotcrete. A thin layer of cementitious matrix is applied to a wet surface. A carbon-fiber reinforcing grid is added.

What kind of concrete is a swimming pool shell made of?

Swimming pool shells are made of pneumatically applied concrete: shotcrete or gunite. They’re both technically shotcrete, but in the pool industry, the difference between shotcrete and gunite is how water is mixed with the cement.