Fly-ash based geopolymer mortar for high-temperature application – Effect of slag addition

Hager, Izabela; Sitarz, Mateusz; Mróz, Katarzyna

doi:10.1016/j.jclepro.2021.128168

Cited by 118 publications

(28 citation statements)

References 30 publications

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“…The similar values of permeability of AAM after drying can be explained by the fact that the elevated temperature triggered a polymerization process that is more pronounced for the blends with lower GGBFS contents, AAM0 and AAM10. This effect was confirmed by research conducted by the authors in [ 4 ]. A temperature-induced process resulted in material densification and strength increase [ 4 ] in this research; the consequence was the permeability decrease for mortars with lower GGBFS content.…”

Section: Resultssupporting

confidence: 81%

“…The compositions of mortars were selected on the basis of previous research on compressive strength and flexural tensile strength [ 4 , 8 ]. The results of the tests show that the addition of a higher content of GGBFS positively affected the mechanical properties.…”

Section: Tested Materials and Methodsmentioning

confidence: 99%

“…The drying process, that preceded the permeability measurement was applied to the AAM samples that were one year old. For AAM and geopolymers when drying is applied, the temperature may trigger progress of polymerization [ 4 ]. The comparison between the permeabilities tested at dry reference conditions (dried at 105 °C) and for material that was stored at room conditions 18 °C and 75% RH.…”

Section: Test Methodsmentioning

confidence: 99%

“…The utilization of waste streams is one of the numerous advantages of AAM applications. These materials, in conjunction with alkaline solution, have excellent binding properties, chemical durability [ 1 , 2 ], fire resistance [ 3 , 4 ] and many other features that may reduce the necessity of Portland cement concrete usage.…”

Section: Introductionmentioning

confidence: 99%

“…The main novelty of the present study consists in the fact that designed materials are able to set at room temperature, with no need of thermal curing, which involves energy savings at the material manufacturing stage [ 4 , 8 , 18 ] The research proved that high-performance materials could be produced, showing an impressive mechanical performance reaching 63.0 MPa at 28 days. Although slag addition improves the mechanical performances of fly ash geopolymer mortar considerably, the durability aspect required investigations.…”

Section: Introductionmentioning

confidence: 99%

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Chloride Ions’ Penetration of Fly Ash and Ground Granulated Blast Furnace Slags-Based Alkali-Activated Mortars

et al. 2021

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Due to the need to reduce the CO2 emissions of mineral binders, researchers are considering the use of alkali-activated materials (AAMs) as an alternative to cementitious binders. The properties of AAMs can be more advantageous than those presented by cementitious binders, and thus they can replace Portland cement binders in some applications. Mechanical tests of AAMs are being conducted on an ongoing basis; however, durability issues related to reinforcing steel in conditions in which steel members interact with chloride ions remain unsolved. In this paper, the precursors for AAM preparations are blends of fly ash (FA) and ground granulated blast-furnace slag (GGBFS) in four slag proportions: 0%, 10%, 30% and 50% expressed as a percent of FA mass. Four alkali-activated mortars were prepared, denominated as AAM 0, AAM 10, AAM 30 and AAM 50, respectively. Their basic physical and mechanical characteristics were investigated, as were their gas transport properties. The nitrogen Cembureau method was applied to determine the permeability of the mortar. The transport properties of the chloride ions were determined using the modified NT BUILD 492 migration test. The comparison of results obtained demonstrated a positive effect of GGBFS addition in terms of an increase in bulk density, permeability, porosity and, at the same time, a reduction in chloride ion penetration. The water absorption tests also provided insight into the open pore structures of mortars. The measurements revealed a strong dependence between fluid transport through the mortars and the water absorption and initial water content of materials.

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Section: Resultssupporting

confidence: 81%

Section: Tested Materials and Methodsmentioning

confidence: 99%

Section: Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chloride Ions’ Penetration of Fly Ash and Ground Granulated Blast Furnace Slags-Based Alkali-Activated Mortars

et al. 2021

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The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

Güler

Akbulut

2023

Structural Concrete

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This paper primarily examines the flowability, physical appearance, mass loss, residual compressive strength (RCS), and residual flexural strength (RFS) properties of steel (ST) and basalt (BA) fiber-added sustainable ultra-high performance geopolymer cement (UHPGPC) mortars exposed to hightemperature effects. According to the results obtained, ST and BA fibers adversely influence the workability properties of UHPGPC mortars and thus significantly reduce the spreading diameters of the mortars. However, ST and BA fibers substantially improve the RCS and RFS capacities of UHPGPC specimens exposed to high temperatures because they have a powerful bonding effect with the matrix and effectually restrict the development of micro-and macro-cracks with their bridging effect. Furthermore, this phenomenon is slightly more effective in hybrid form than using ST and BA fibers.

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Pull‐off capacity of FRP–concrete composite bonded with epoxy/geopolymer at elevated temperature

Rashid,

Fatima,

Daud

et al. 2023

Structural Concrete

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Externally bonded strengthening technique to the concrete has been widely used with epoxy adhesive. However, the adhesive is considerably weak against high temperatures, which has been regarded as the critical point in the loss of integrity of the strengthened system. Alternatively, geopolymer materials have shown an excellent performance at high temperatures, thus, their potential to be used as adhesive material has been investigated in this work. In experimentation, the composite specimens were developed using both types of adhesives, epoxy and geopolymer, and their performance was evaluated at three temperature levels (20, 60, and 120°C) by conducting pull‐off strength tests and classifying their failure modes. It was observed that the strength of concrete and epoxy was reduced with temperature. In contrast, the strength of geopolymer‐based adhesives strength was increased due to the reactivity of the precursor at high temperatures. Also, bond strength was reduced for both composite specimens at elevated temperatures. The highest bond strength was observed for the epoxy‐based adhesive system at 20°C, and about 70% loss in bond strength was observed when exposed to 120°C. The failure mode was also shifted from concrete to adhesive interface failure, that is, failure between the adhesive and the fiber fabric layer. The geopolymer‐based adhesive system has lower strength than its counterpart at all temperature levels, and the failure mode was adhesive interface failure. To enhance the bonding capacity at high temperatures, efforts are being made by adding different minerals has been employed. From the experimental results, it was found that there were some improvements, however, it was still less than that of epoxy‐based system. Further optimization of the geopolymer adhesive using minerals is required and then high‐thermal resistance geopolymer adhesive can be established.

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Fly-ash based geopolymer mortar for high-temperature application – Effect of slag addition

Cited by 118 publications

References 30 publications

Chloride Ions’ Penetration of Fly Ash and Ground Granulated Blast Furnace Slags-Based Alkali-Activated Mortars

Chloride Ions’ Penetration of Fly Ash and Ground Granulated Blast Furnace Slags-Based Alkali-Activated Mortars

The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

Pull‐off capacity of FRP–concrete composite bonded with epoxy/geopolymer at elevated temperature

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