Investigation of mechanical properties, durability properties, and functionality of cement-based repair mortars containing steel and alumina industrial wastes

Document Type : Research Paper

Authors

1 Department of civil engineering, Ferdowsi university of Mashhad, Mashhad, Iran

2 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)

10.22124/jcr.2022.20837.1523

Abstract

In the present study, steel and alumina industrial wastes (ground granulated blast-furnace, electric arc furnace dust, and red mud) were used as a partial replacement for cement to form cement-based repair mortars. By substituting 5%, 10%, and 15% of cement with these materials a total of 14 mixtures were formed and an experimental program comprising three distinct parts was carried out. In the first part of the experimental program, the microstructure and chemical composition of all the constituent materials were examined. In the second part, resistance to acid sulfuric, water absorption, and electrical resistivity tests were conducted to evaluate the durability performance of the mortars, and compressive strength and tensile strength tests were performed to assess the mechanical properties of the mortars. In the last part of the experimental program, one reinforced concrete beam was strengthened in shear using repair mortar and carbon fiber reinforced polymer (CFRP) sheets and it was compared with a reinforced concrete beam without strengthening and a beam strengthened in shear using epoxy and CFRP sheets. The beams were tested by implementing a concentrated load and their shear capacity was compared to evaluate the performance of repair mortar. The results indicate that strengthening using repair mortar resulted in 23% increase in the shear capacity compared to the control specimen, while the shear capacity of the specimen strengthened with epoxy increased by 14% compared to the control specimen.

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References

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