The influence of the mixing procedures on the optimization of fresh grout properties

The purpose of a grout injection technique applied in a multiple leaf wall is to increase the compactness and create links between the internal and external leaves. The correct grout selection should take into account many characteristics, in particular injectability and stability. This paper analyses the variations of some fresh grout properties that may affect injectability and stability-water retention, rheological behaviour and bleeding. The study has sought to increase the understanding of the influence of the mixing procedure in grout behaviour and how it may improve some essential injection characteristics. For this purpose, a natural hydraulic lime grout has been considered. The paper shows that there are differences in the grout behaviour when different mixing procedures are used and that fresh grout properties may be optimized if a proper mixing procedure is chosen.