Abstract
Stereo pair imaging in a scanning electron microscope was used to document details of the topography of fracture surfaces at various degrees of magnification. The fracture surfaces investigated had been produced by fracture testing of chevron notched beam specimens according to ISRM Method 1. The procedure involved loading in a very stiff machine to the point of initial deviation from lineariry, unloading, and reloading repetitively until failure. Specimens were prepared and examined from dolomite and andesite rock used commercially for concrete aggregates, and from cement paste with and without silica fume. Various topographic features of the fracture surfaces are described.
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