Environmentally friendly tunnel sealing and stabilization

Abstract: HIS is a grouting system of high cement content modified with some reaction resin in a one-shot application. It accelerates cement sticking and hardening. Therefore, the material is not washed out and the strength development in early states is activated. With these benefits the Hybrid Injection System closes the gap between economically pure cement grouting and technical highly effective reaction resin applications. HIS can be adjusted to different cement types as well as to the broad range of applications done by injection grouting. The enhancement not only covers the technical aspect but additionally the environmental assessment. HIS radically reduces cement spill-out and minimizes elution of organic or inorganic contents and reduces ecotoxicological impact on ground soil and water. As HIS can be used with CEM III types the novel injection system contributes to a lower carbon footprint of injection grouting.