Textile-Reinforced Mortar Strengthening of Masonry Piers Containing Industrial Waste Coal Gangue Sintered Bricks
Publication: Journal of Composites for Construction
Volume 26, Issue 2
Abstract
The diffusion and adoption of coal gangue sintered bricks can effectively relieve the negative impact of coal gangue on the ecological environment. In China, this type of brick has been widely used for the construction of masonry structures. Existing masonry structures that use these types of bricks can experience severe problems related to safety, and strengthening by textile-reinforced mortar (TRM) is a valid measure for improving their performance. In this paper, the compressive performance of TRM-confined coal gangue sintered brick masonry piers was experimentally investigated. The influences of the number of textile layers, textile types (carbon and basalt), and additional FRP confinement at the upper and lower ends of the specimens on the compressive performance were mainly considered. The failure mode and increased effectiveness of the compressive strength, ultimate strain, and energy dissipation after TRM confinement were discussed. An existing model was also used to analyze the compressive strength. The results indicated that the compressive behavior of gangue sintered brick masonry piers could be significantly improved after TRM confinement, and the existing equation demonstrated relatively good prediction ability.
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Acknowledgments
The authors gratefully acknowledge the financial support from the Six Talent Peaks Project in Jiangsu Province (JZ-029) and the Science Research Project of Inner Mongolia University of Technology (ZZ202116). Lei Jing acknowledges the support from the China Scholarship Council and the University of Western Australia for hosting his visiting research.
Notation
The following symbols are used in this paper:
- b
- length of the masonry pier cross section, mm;
- D
- length of the diagonal for square or rectangular cross sections, mm;
- E
- stiffness of the masonry pier specimens, MPa;
- Ea
- energy dissipation capacity of the masonry pier specimens, J;
- Ef
- Young’s modulus of the textiles, MPa;
- fc,mat
- compressive strength of the TRM matrix, MPa;
- fl,eff
- effective confined pressure provided by the external TRM confinement layer, MPa;
- fmax
- peak compressive strength of the masonry pier specimens, MPa;
- fmc
- compression strength of the confined masonry piers, MPa;
- fmo
- compression strength of the unconfined masonry piers, MPa;
- gm
- mass density of the masonry, kg/m3;
- h
- width of the masonry pier cross section, mm;
- k
- effectiveness action coefficient of the external TRM;
- kmat
- effective confinement coefficient of the TRM matrix;
- ke
- ratio of the effectively confined area;
- n
- number of textile layers;
- rc
- circular radius of the masonry pier, mm;
- tf
- equivalent thickness of the textiles, mm;
- tmat
- thickness of the TRM matrix; mm;
- ɛfd
- calculated tensile strain of the textiles, mm/mm;
- ɛfu
- ultimate tensile strain of the textiles, mm/mm;
- ɛu
- ultimate strain of the masonry pier specimens mm/mm;
- ηa
- environmental conversion factor; and
- ρmat
- geometrical percentage of the applied matrix in TRM.
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Received: Jun 1, 2021
Accepted: Dec 21, 2021
Published online: Feb 14, 2022
Published in print: Apr 1, 2022
Discussion open until: Jul 14, 2022
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