Edinburgh Napier University

  A new method was elaborated to characterize the breakage properties of rocks. A crushing test was suggested and parallel tests were performed on sand-pairs with different parent rocks, using identical initial gradings. The data were analysed using the grading entropy theory, the grading curve variation was represented in the entropy diagram (with a coordinate uniquely related to the mean log diameter). The results with various rocks with the same conditions indicated the same en-tropy path, only the speed was different. Based on this, a new testing method can be suggested. As a by-product of the result, it is shown that the breakage path and the internal stability of soils seem to be linked. The discontinuity of the normalisedentropy path at the appearance of some finer fractions drifts out the normalised entropy path from the unstable part of the diagram. A second consequence is the explanation why fractal distribution with fractal dimension n