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Effect of the Blast Furnace Slag on Microstructural and Transport Properties of the Fly Ash-based Geopolymers

Azimi, Zahir | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54751 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Toufigh, Vahab
  7. Abstract:
  8. Alkali-activated fly ash-slag (AAFS) is a new type of sustainable construction material widely studied in recent years for its desirable mechanical properties and low environmental impacts. In this study, the effects of the slag incorporation from 10 to 30% of fly ash are investigated on the strength, pore structure, and transport properties of the AAFS with various levels of fly ash replacements with slag. The unconfined compression and ultrasonic pulse velocity tests were performed to evaluate the mechanical properties of the AAFS concrete. Microstructural and mineralogical changes were studied by porosity, N2-adsorption/desorption, and SEM/EDX tests. Additionally, transport properties were assessed by electrical surface resistivity, water permeability, and water vapor permeability tests. According to the results, a remarkable refinement in the pore volume was found by increasing the slag content. The volume of the gel pores and surface area enhanced significantly associated with the tortuosity increase. Accordingly, Ca inclusion in the N-A-S-H structure remarkably reduced the transport properties. The results showed that, by 30% of slag replacement, compressive strength increased by 94.12% and water and water vapor permeability coefficients decreased by 95.88 and 50%, respectively
  9. Keywords:
  10. Geopolymer Concrete ; Transport Properties ; Pore Structure ; Water Permeability Test ; Electrical Surface Resistivity ; Water Transfer

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