JETGROUTING FOR FOUNDATION REINFORCEMENT - A STEP TOWARD A MORE SUSTAINABLE SOLUTION

Jet grouting (JG) is a well-known and often used geotechnical technique suitable for various applications, such as underpinnings and foundation reinforcement. The downsides are its comparatively high CO2 footprint, caused by the high amount of cement used, and accumulating waste, i.e., backflow slurry. The former, cement, is recognized for its CO2 emission potential and we are seeing new binders being introduced as surrogates, a process driven by the cement industry. The latter, spoil, must be taken care of on site. Here, the use of centrifuges is a promising approach to reduce waste. Centrifuges offer a high throughput in relation to space requirements when compared with other systems, e.g., chamber filter presses (CFP). This paper presents exemplary projects which used jet grouting for foundation reinforcement. For our analysis we are using data from a construction site that worked both with and without a centrifuge during different stages of its production time. This allowed a more precise analysis than comparing two different sites. Using the calculated CO2 footprint and other parameters, the operation of the centrifuge is evaluated regarding its environmental and economic impact
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