ABSTRACT
Self hardening stable cement-bentonite suspensions were successfully applied by the authors to underground cavities filling, foundation blocks consolidation and their monolith adherence to the surrounding soil, hampering the movement of fluids through the ground. Their penetration in ground occurs by filling the preexisting voids or by hydraulic fracturing. The latter allows the suspension penetration and hardening in soil with fine pores, where grouting is not efficient, resulting in a considerable extension of groutable soils. The case histories mentioned in the paper are obvious examples of the successful application of grouting by hydraulic fracture in sandy silt with permeability coefficient lower than 10”5 h- 10”6 cm/s. Some less usual parameters of the suspension and resulting hardened material are mentioned: the cohesion according Lombardi plate, nonlinear (hyperbolic) constitutive law and plastic deformation.
