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In this study, effect of alkaline solution and ground granulated blast furnace slag (GGBS) on performance of chloride added geopolymer concrete (GPC) produced with fly ash-GGBS (precursor materials) proportion of 100:0 (100FA:0G) and 70:30 (70FA:30G) were evaluated. The alkaline solution made from combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) solutions was used in this study. Solutions of NaOH with concentrations of 10 and 14 M were used in preparation of alkaline solution. Sodium chloride of different dosages i.e., 0 and 5% by mass of geopolymer solids was admixed in GPC mixes during preparation. Tests for workability, and early age compressive strength at 7 days were carried out on GPC. For early age microstructure, Fourier transform infrared (FTIR) spectroscopy and Field emission scanning electron microscope (FESEM) investigations were carried out. From obtained results, workability of GPC increased in presence of chloride ions. Higher 7 days compressive strength was observed in fly ash based (100FA:0G) GPC as compared to fly ash-GGBS (70FA:30G) GPC at greater molarity of NaOH (14 M) solution, whereas, higher strength was observed in 70FA:30G GPC than 100FA:0G GPC at lower molar concentration of NaOH (10 M) solution. The reduction in strength was detected in chloride added GPC mixes when compared with control GPC mixes (without chloride). From microstructure study, formation of geopolymer gel, which contributed toward strength development in GPC was confirmed from FTIR spectroscopy, and FESEM micrographs. In addition, presence of halite was identified from FESEM micrographs of chloride admixed GPC mixes.

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Influence of Concentration of Alkaline Solution and Precursor Materials on Strength, and Early Age Microstructure of Chloride Added Geopolymer Concrete

  • 会议论文

  • 发表日期：

    2025年

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  • Suresh Chandra Sadangi,
  • Bulu Pradhan

摘要

In this study, effect of alkaline solution and ground granulated blast furnace slag (GGBS) on performance of chloride added geopolymer concrete (GPC) produced with fly ash-GGBS (precursor materials) proportion of 100:0 (100FA:0G) and 70:30 (70FA:30G) were evaluated. The alkaline solution made from combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) solutions was used in this study. Solutions of NaOH with concentrations of 10 and 14 M were used in preparation of alkaline solution. Sodium chloride of different dosages i.e., 0 and 5% by mass of geopolymer solids was admixed in GPC mixes during preparation. Tests for workability, and early age compressive strength at 7 days were carried out on GPC. For early age microstructure, Fourier transform infrared (FTIR) spectroscopy and Field emission scanning electron microscope (FESEM) investigations were carried out. From obtained results, workability of GPC increased in presence of chloride ions. Higher 7 days compressive strength was observed in fly ash based (100FA:0G) GPC as compared to fly ash-GGBS (70FA:30G) GPC at greater molarity of NaOH (14 M) solution, whereas, higher strength was observed in 70FA:30G GPC than 100FA:0G GPC at lower molar concentration of NaOH (10 M) solution. The reduction in strength was detected in chloride added GPC mixes when compared with control GPC mixes (without chloride). From microstructure study, formation of geopolymer gel, which contributed toward strength development in GPC was confirmed from FTIR spectroscopy, and FESEM micrographs. In addition, presence of halite was identified from FESEM micrographs of chloride admixed GPC mixes.