Investigating the mechanical properties and drying shrinkage of fiber geopolymer repair mortar containing waste from iron and aluminium factories

Document Type : Research Paper

Authors

Civil Engineering Department. Technical Faculty, Guilan University, Rasht, Iran

10.22124/jcr.2023.25748.1631

Abstract

In this article, the ground granulated blast furnace slag and red mud, which are the waste products of iron and aluminum factories, were used as aluminosilicate base materials in the mix design of geopolymer repair mortar. The activation of base materials was done with a combination of sodium hydroxide solution (soda) and sodium silicate (water glass).The effect of steel fibers on compressive strength, toughness and drying shrinkage of mortar was investigated. Fiber mortars were used as a repair layer to retrofit brick beams. The results showed that the use of steel fibers in geopolymer mortar can effectively improve compressive strength and toughness, reduce drying shrinkage, and change the brittle fracture behavior of brick beams to a ductile behavior. The results of SEM-EDS test and measurement of Si/Al molar ratio indicated the existence of a three-dimensional and chained structure of geopolymer in the mortar microstructure. The conducted research is an effective and forward step in achieving geopolymeric products with an environmental and economic approach.

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Main Subjects

References

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