Khairuddin, Siti Amirah Azra (2023) Performance of concrete filled hollow section with fibrous foamed concrete subjected to axial compression load. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The use of a concrete-filled section as a column has been widely used due to its structural elements. However, most recent studies have only focused on three types of concrete: normal, high-strength and lightweight aggregate. Foamed concrete has received significant attention due to its potential as a structural construction material. However, the mechanical properties of foamed concrete have to be improved due to its brittle behaviour. Adding 40% of Rice Husk Ash (RHA) as sand replacement, 0.8% of steel fibre and 0.4% of polypropylene fibre (volume fraction of total concrete) to foamed concrete can improve the mechanical properties of modified fibrous concrete. A sum of 60 specimens with the sizes of 100(b) mm x 100(h) mm x 350(l) mm and thicknesses of 2 mm and 4 mm were tested. The highest result for bond strength and of ultimate strength is CFHS-RHA-SF for both 2 mm and 4mm thicknees. The bond strength was 0.171 MPa and 0.482 MPa for 2 mm and 4 mm. Meanwhile, the results ultimate strength for 2 mm and 4 mm was 464kN and 991kN. The results showed that the differences in the percentage between the experiment and the theoretical analysis ranged from 10% to 58%. This was due to the coefficient for concrete that provided based on Eurocode 2 is used for normal concrete. The failure mode for all specimens showed outward bulging at the top of the specimens. Additionally, quantitative analyses were carried out using finite element software (ANSYS) with various thicknesses of 2 mm, 4 mm, 6 mm, 8 mm and 10 mm. The results of the FEM analysis were similar to the results of experimental work in terms of the ultimate strength and failure mode. The empirical equations for ultimate strength of CFHS with modified fibrous foamed concrete proposed in this study showed good agreement with the experimental results

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