Shotcrete

Shotcrete was invented in the USA in the early 1900s (where it is mainly known by its trademark name of Gunite). It is now commonly used in both residential and commercial industries. However, Shotcrete remains relatively new to Aotearoa primarily due to shortages in shotcrete specialists.

Retimix's founder, Laurent Reti, is, however, the specialist you need to know. Laurent is one of the founders in introducing Shotcrete to Aotearoa. With Retimix now being a family business, Diaz Reti's shotcrete skills now form part of our specialist shotcrete team.

There are many benefits of Shotcreting (spraying the concrete), including but not exclusive to:

Consolidating the concrete on impact.
It supports immediate sculpting, carving or trowelling.
The placement process enables an excellent bond with most substrates.
The spray process reduces the water/cement ratio, making a more robust concrete solution than cast-in-place concrete.
Provides rapid or instant capabilities, particularly on complex forms or shapes.
It serves new construction and repairs.
It does not require conventional forming.
It can take any shape or colour and is suitable for curved and thin elements.
Is suitable for free-form construction.
Eliminating or significantly reducing formwork (other than the service being sprayed).
It is more economical (in time and being cost-effective due to having lower construction costs).

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What is Shotcrete?

Shotcrete is a mixture of aggregate and portland cement sprayed onto a surface using compressed air or hydraulic pressure. This propels the concrete through a hose and nozzle at high velocity, increasing the discharge pace and permitting a placement process, enabling an excellent bond with most substrates.

Can wet or dry concrete be used?

Wet or dry-mix concrete can be used. The wet-mix process fuses all the elements, including the water, together before entering the hose.

With dry-mix Shotcrete, water is added at the nozzle discharge.

Both support the concrete being carved, sculpted or trowelled almost immediately.