Injizierfaehigkeit von Feinstbindemittelsuspensionen zur Abdichtung von Lockergesteinen

Subject of this work are experimental investigations on the injection behaviour of grouting suspensions based on microfine binders and the development of their depth of penetration. Microfine binders are air separated, very fine grained, hydraulic bonding agents. Suspended in fluids they are suited for grouting fine pore systems which could only be grouted by chemical agents until now. However, sodium-silicate injections are more often admitted carefully due to ecological objections. As the calculation parameters of the groutability of microfine binders were not systematically analysed yet, there are some uncertainties in the practical design of groutings with microfine binders. In a first step one-dimensional grouting tests were performed with a variation of different influencing parameters. Clogging and deep filtration occurred in all test series. These effects increased with decreasing grouting rate and thus the decrease of the hydraulic traction forces. The coefficient of permeability k* and the density of the suspension after discharge were identified as indicators of these phenomena. The coefficient of permeability k* represents the calculated values of the permeability of the pore system for the grouted suspension. (orig.)SIGLEAvailable from TIB Hannover: RA 2774(50) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman