Abstract
Whether rules based on fracture mechanics or classical mechanics should be used as a basis for design and analysis depends on the notch sensitivity as well as the fracture toughness of the material. Therefore, information about these properties of all structural materials is important. Experiments were undertaken to investigate the notch sensitivity and fracture toughness of concrete with different types, volumes, sizes and strengths of aggregate. The investigation, which was carried out on small flexural specimens with notches of lengths up to 25 mm, indicates that both mortar and concrete are notch sensitive materials although not as sensitive as neat cement paste. If the assumption is valid that the fracture of neat cement paste is governed by the established theory of linear fracture mechanics, however, it appears that this theory is not applicable to small-size members of mortar and concrete. Light-weight concrete appears to have about the same fracture properties as neat cement paste.
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