ABSTRACT
In mechanized tunneling, the annular gap between the segmental lining and the surrounding soil must be filled with a suitable grouting material simultaneously. When using two-component grouts as grouting material with a composition adapted to the geological and structural conditions, the early bedding of the recently installed segment ring but also a permanent position stability of the tunnel can be reliably achieved. In the compilation of two-component grouts, by now exclusively on an empirical basis, primarily hydraulic binders are used. In order to increase the economics of such systems, it is obvious to replace the hydraulic fraction in the binder by suitable substituents without adverse consequences. As a result of systematic investigations, the use of latent-hydraulic blast furnace slag has proved to be suitable in the system of activated annular gap grouts. In combination with different activator configurations, exchange rates of up to 70% of the cement are possible.
