Enhancement of Mechanical Properties, Drying Shrinkage and High Temperature Resistance of Geopolymer Mortar Containing Ground Granulated Blast Furnace Slag and Red Mud with Basalt Fiber

Document Type : Original Article

Authors

1 Associate Professor, Department of Civil Engineering, Faculty of Technical Engineering, University of Guilan, Guilan, Iran.

2 Ph.D. Student, Department of Civil Engineering, Faculty of Technical Engineering, University of Guilan, Guilan, Iran.

Abstract

The purpose of this research is to investigate the effect of adding basalt fibers on flowability, setting time, shrinkage and compressive and flexural strengths of geopolymer mortar cured at ambient temperature. 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 geopolymer mortar mix design. Also, for the first time, the residual compressive and flexural strengths of geopolymeric mortars containing basalt fibers exposed to three thermal regimes including 600°C for 60 minutes and 600°C and 800°C for 90 minutes were measured and investigated. XRD tests revealed that geopolymers undergo a structural phase change from amorphous to crystalline at high temperatures. In addition, the results showed that adding 0.5% of basalt fibers as an optimal percentage, not only can solve the problem of drying shrinkage of geopolymer mortars, but also the use of this amount of basalt fibers can increase the compressive and flexural strength of geopolymer mortars both at ambient temperature and at high temperatures. Therefore, geopolymer mortar containing 0.5% basalt fibers, in addition to having positive environmental aspects, can be used as a repair mortar with high mechanical characteristics and also suitable resistant to high temperature for the repair and retrofit of concrete structures.

Keywords

Main Subjects

References

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