The Performance of Alkali-Activated Self-Compacting Concrete with and without Nano-Alumina

Shimal Jameel Younus, Mohammad Ali Mosaberpanah () and Radhwan Alzeebaree
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Shimal Jameel Younus: Civil Engineering Department, Cyprus International University, North Cyprus, Nicosia 99258, Turkey
Mohammad Ali Mosaberpanah: Civil Engineering Department, Cyprus International University, North Cyprus, Nicosia 99258, Turkey
Radhwan Alzeebaree: Akre Technical Institute, Duhok Polytechnic University, Duhok 42001, Iraq

Sustainability, 2023, vol. 15, issue 3, 1-22

Abstract: The environmental pollution crisis has infiltrated all aspects of life, making it hard to avoid the hazards. To address this, it is essential to recycle industrial waste through green concrete technology, such as ground-granulated blast furnace slag (S), silica fume, and fly ash (FA). In this study, the effect of nano-alumina (NA) on the fresh and hardened stag of fly ash and/or slag-based alkali-activated self-compacting concrete (A-ASCC) cured in an ambient environment was investigated. Three different types of binders were used: 100% slag, 50% slag and 50% fly ash, and 100% fly ash. Four ratios of nano-alumina (0%, 0.5%, 1%, and 1.5%) were used as partial replacements for binder materials. The fresh characteristics of A-ASCC were evaluated by indicating the slump flow, T 50 value, V-funnel, and L-Box tests. The mechanical properties of A-ASCC were evaluated by measuring the compressive strength, flexural tensile strength, and splitting tensile strength test values to assess the qualities of the hardened state. Scanning electron microscopy (SEM) was also used to clarify the microstructure of the A-ASCC specimens. Regardless of the binder materials used, the addition of NA has a negative effect on fresh state performance. The mechanical performance of alkali-activated A-ASCC was significantly improved by the incorporation of NA. The incorporation of NA with 50% slag and 50% fly ash showed better properties than other binder materials. However, the highest flexural and compressive strengths were achieved with 1% NA and 100% FA, and the maximum splitting tensile strength was achieved with 1.5% NA. Furthermore, using NA significantly increases the A-ASCC setting time and may be used to produce A-ASCC in an ambient environment.

Keywords: alkali-activated self-compacting concrete; Nano Alumina; slag; fly ash; hardened and fresh state properties (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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