UPSI Digital Repository (UDRep)
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UPSI Digital Repository (UDRep)
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| Abstract : Perpustakaan Tuanku Bainun |
| Environmental protection and recycling of resources are issues of international concern today, recycled concrete, as a green building material, can promote the healthy development of the construction industry. This study aims to assess the mechanical enhancements in recycled concrete when reinforcing with varying steel fiber volumes, evaluating its potential for broader structural applications. By reinforcing the recycled coarse aggregate, the addition of steel fibers, and the study of improved mechanical properties of the recycled concrete improved scale. Designing a comparative experiment to analyze mechanical properties of three different coarse aggregate steel fiber-reinforced recycled concretes, steel fiber volume rates were 0%, 1%, 2%, and 3%, and strength class was C30, a total of 144 pieces of 100mm x 100mm x 100mm cubic specimens. Analyzing uniaxial compression, split tension, shear, and biaxial compression-shear forces, the study of damage mechanisms and stress-strain curve performance, establishing the corresponding constitutive relationship model, measurement of displacement and strain fields by Digital Imaging Correlation (DIC) technology, observation of force damage. The research finds that strengthening recycled coarse aggregates can improve interface structure between the matrix and aggregates, significantly enhanced the strength of recycled concrete, it can achieve the strength value of conventional concrete. Adding steel fibers improves the weak interfacial transition zone, enhances stability, and increases toughness, thereby delaying damage evolution, the mechanical properties improve as the volume fraction of steel fibers increase. The study concluded that the reinforcement of recycled coarse aggregates and the incorporation of steel fibers can reduce stress-induced damage, and the improvement in the mechanical properties of recycled concrete by steel fibers is superior to that of conventional concrete, and the optimal volume fraction of steel fibers can be selected as 2%. The results implicated that strengthening recycled coarse aggregates can replace natural coarse aggregates, meeting the requirements of construction engineering. |
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