Injection capacity of hydraulic lime grouts in different porous media

Evaluation of the grout injectability and types of resistance to grout flow

“…In contrast with other works of the authors [12,14], the granulometry of each PM is not constant along the height of injection. Six granulometry fractions (coarse -C, medium -M, fine -F, very fine -f, M + F and M + f) were adopted in order to simulate different permeabilities and void size distributions (Figs.…”

“…This research gives continuity to the papers [12,14,20] where the performance of the grout injection was analysed (in fresh and hardened state). In this paper, the main aims are: the study of grout injection in PM with different grain size distributions along the injection, the evaluation of Darcy's law and front resistance in grout injection tests and the creation of an additional resistance to the grout flow (R s ), allowing a more accurate evaluation of the injection.…”

“…Table 1 lists some characterization parameters of each fraction. They have already been adopted in other articles of the authors [12] and also in literature [13]. As explained in [12], the parameters voids size average, d(90), d (15) and specific surface are obtained from grain size distribution curves (Fig.…”

“…Porosity was estimated by measuring the volume of water that can be filled into each particle size fraction [7,22]. In previous studies [12,22], the range for the total porosity was between 40% and 55%. In this study, the total porosity of each cylinder is in the range 43-46%.…”

“…Depending on the grain size distribution of PM particles, the parameters referred have different influence on injectability. Thus, it is necessary to characterize all parameters of the PM so that the injection capacity of the grout can be estimated [12]. In this paper to evaluate the injection performance of the grouts in function of the PM, small scale models (cylinders created in laboratory) already used in previous works have been used [12][13][14].…”