ABSTRACT
Injection is the most used technique in repair and retrofitting of three-leaf walls mainly because of the simplicity of its application and the effectiveness of its use. The aims of the injection technique are the reduction of the weakness of the internal core, by filling the existing voids and cracks, and the improvement of its adherence to the external leaves, by filling the gaps between leaves. Several studies have been performed in the last years concerning this technique (Binda et al. 1994, Vintzileou et al. 1995, Toumbakari 2002, Valluzzi et al. 2004), however, special attention with regard to material compatibility is needed, which limits the grout selection (Binda, 2006).
