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- W1565999747 abstract "The study presents the results of fracture tests conducted on concrete in which metakaolin is used to partially replace the cement. The energy required to cause catastrophic failure in concrete cubes containing two symmetrical notches is determined using two approaches. The first is based on the stress intensity factor determined by finite element analysis and the second utilises the energy absorbed by the test specimen up to failure. The test methodology enables estimates to be made of the extent of tortuosity of the fracture surface. The tests are conducted in a stiff testing machine under axial and eccentric loading conditions. The notched samples were allowed to cure in water at room temperature until testing at 28 and 91 days. It is found that increasing cement replacement levels by metakaolin (up to 15%) results in systematic increases in compressive strength and fracture energy. Metakaolin is also found to reduce the tortuosity of the fracture surface. This phenomenon is attributed to the additional strength imparted to the paste component of the matrix and the reduction in the thickness of the interfacial layer, resulting in more composite action between the paste and the coarse aggregates. Visual inspection of the fracture surfaces confirms the role played by the incorporation of metakaolin in causing the fracture to propagate across the coarse aggregates, thus resulting in smother surfaces." @default.
- W1565999747 created "2016-06-24" @default.
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- W1565999747 date "2013-04-03" @default.
- W1565999747 modified "2023-09-24" @default.
- W1565999747 title "Fracture in metakaolin concrete under different loading conditions" @default.
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