SPRAYED CONCRETE

When high volume or large areas require treatment, machine applied concretes and mortars through spray application are often the most suitable due to the speed at which both the ‘Dry’ and ‘Wet’ Spray application methods permit. Each process has its advantages; the structure’s durability, present stresses, aesthetic criteria and environmental constraints are all factors in the selection of the preferential approach for each project.

Dry Spray Techniques: Dry spray machine applied concrete is extremely versatile, as a system which requires no pre-mixing of the materials or priming of the prepared repair areas. It can be a very cost effective method where the site wide environment can either tolerate or confine the rebound and dust by-products of the application process.With long feed distances possible, higher outputs can be achieved and application plant costs are kept to a minimum.

Wet Spray Techniques: This process is advantageous when repairs are required in environmentally sensitive areas, or those in confined spaces. Because rebound and dust are kept to a minimum, and the constant concrete consistency achieved in this technique, this method can be employed continuously and effectively, even on horizontal or top face surface applications. Float finishing of the applied concrete is relatively easy and the site requires minimal protection - making this a uniquely adaptable technique for a wide range of applications. Significantly, spray concrete plays an increasingly important role in new build projects. Its versatility - allowing complex forms and shapes to be achieved allowing the engineer/architect complete freedom of design - together with its cost effectiveness, is now recognised at the design stage as having many advantages.

HYDRO DEMOLITION The process which uses water jets to break up concrete has many advantages: Faster removal rates with less noise, less dust and less damage to reinforcement bar or sound concrete are improving renovation projects throughout the industry. Steel reinforcements is typically prepared to Sa21/2 standard, eliminating the need for subsequent grit blast preparation.

The Hydro-demolition processes can be undertaken either by manual operation at the nozzle or via a robotic nozzle unit which provides a uniform, consistent and rapid removal of concrete overlarge areas.