Abstract

A laboratory investigation was conducted in order to evaluate the injectability of cement suspensions. Four gradations from CEM II/B-M (according to EN 197-1) type of cement were used having nominal maximum grain sizes of 100μm, 40μm, 20μm and 10μm. The properties of suspensions, with water to cement (W/C) ratios of 1:1, 2:1 and 3:1 by weight, were determined in terms of bleeding and setting times. Injectability was evaluated by conducting one-dimensional injections into five different, clean sands using a specially constructed device. Injectability of cement suspensions increases with increasing cement fineness and water to cement (W/C) ratio. Microfine cement suspensions with water to cement (W/C) ratios of 2:1 and 3:1 can penetrate into medium to fine sands.

Keywords: Grouting; Suspensions; Injectability; Microfine cements; Laboratory investigation; Grouted sand