Abstract
Textural irregularities of fracture surfaces of cement-based materials seem to be an interesting source of information on some mechanical properties. Besides compressive strength, the flexural strength is strongly correlated with height irregularities (i.e. roughness) of fracture surfaces of hydrated cement pastes. This correlation has been a subject of experimental study. An analytical relation between flexural strength and height irregularities has been inferred. The formula contains height parameters, which represent basic descriptors of surface irregularities of fracture surfaces of cement pastes. These irregularities are governed by the capillary porosity of cement pastes with different water-to-cement ratios. The relation yields values that are in agreement with the empirical formula published in the technical literature.
Highlights
There is no doubt that the topology analysis of fracture surfaces is capable of providing valuable information on mechanical properties of fatigue failed materials
The flexural strength is strongly correlated with height irregularities of fracture surfaces of hydrated cement pastes
The formula assumes the form of a four-parametric function with one variable that is represented by the surface height irregularities of fracture surfaces
Summary
There is no doubt that the topology analysis of fracture surfaces is capable of providing valuable information on mechanical properties of fatigue failed materials. Besides other materials, it is the widely used cementitious materials that are the subject of fractographical research. One of the so far not resolved question concerns the possible existence of the relation between flexural strength and roughness of fracture surfaces of these materials. In the previous few years, great effort has been devoted to the research of textural irregularities of fracture surfaces [1 - 5]. It was shown that there is a close correlation between height irregularities of fracture surfaces and water-to-cement ratio r of hydrated cement pastes [3]:
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