A combined experimental and numerical approach is adopted to investigate crack propagation in sandstone. Experiments on two types of sandstones show a similar behaviour as found in tests on concrete specimens. The heterogeneity of the material in combination with the stress situation, as a result of the applied load, governs the direction of crack propagation. Cracks that develop axe not continuous, but overlaps exist mainly around the grain particles in the material. A simple lattice model, in which the material is schematized as a network of small beams, is adopted to simulate the experiments. Using the simulations caxried out with the lattice model, stable four-point-shear tests were designed. The crack patterns obtained with the model are in good agreement with the experimental observations. However further study is needed to predict the load-displacement response more accurately.

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