A Method for Measuring and Evaluating the Penetrability of Grouts

This paper suggests a method for measuring the penetrability of grouts. The proposed method evaluates the penetrability of the grout based on measurements with a newly developed device where the grouts ability to pass filters of different widths is measured. After evaluation two especially descriptive parameters are obtained, a minimum and a critical aperture. These two parameters describes the penetrability of the grout and can be used for comparing grouts and in modelling grout propagation. In the paper some measurements and evaluated results are presented. This is to study some governing factors for the penetrability of grouts but the main objective is to demonstrate the proposed method. The results confirms that the main factor governing the penetrability is the type of cement used and that variations in w/c ratio and addition of superplasticizers only have limited influence. Measurements on the filter cake shows that the thickness and the density are influenced by pressure and w/c ratio.