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This research investigates the synthesis of environmentally friendly binders, specifically “geopolymer composite materials” using kaolinitic clay and lignite bottom ash as main raw materials with an initial SiO2/Al2O3 molar ratio of 4.0. Additions of different calcium additives viz. Calcium carbonate at CaO/SiO2 molar ratios of 1.0, 2.0, and 3.0 and calcium hydroxide at CaO/SiO2 of 1.0, and different H2O/Na2O ratios of 9.8 and 15.7 are investigated. In addition, curing times (7 and 14 days) are observed to study its effect on mechanical properties of the synthesized geopolymer. The compressive strength of geopolymer materials at 14 days using calcium carbonate with CaO/SiO2 molar ratios of 1.0, 2.0 and 3.0 at H2O/Na2O ratio of 15.7 are 34.7, 26.8, and 24.0 MPa, respectively. At the H2O/Na2O ratio of 9.8, the strength values are 36.5, 28.4, and 18.0 MPa, respectively. The CaO/SiO2 molar ratio of 1.0 shows the highest compressive strength for both H2O/Na2O ratios due to the highest calcium silicate hydrate (CSH) and the geopolymeric phases, which are the binding phases. When compared to the geopolymer material using H2O/Na2O of 9.8 and calcium hydroxide with a CaO/SiO2 ratio of 1.0, it possesses 26.8 MPa at 14 days. At the same CaO/SiO2 ratio, CaCO3 used in the mix provides the stronger geopolymer composite material than Ca (OH)2 because the geopolymer composite with CaCO3 shows the higher CSH content and the denser microstructure than that with Ca (OH)2. However, the geopolymer composite material using Ca (OH)2 demonstrates better CO2 capture under accelerated carbonation than that using CaCO3.

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Synthesis of Geopolymer Composite Materials Using Lignite Bottom Ash-Clay Mixes and Their Phase Development and Accelerated Carbonation

  • 会议论文

  • 发表日期：

    2025年

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  • Chanikarn Kumprom,
  • Naruemon Setthaya,
  • Adisak Siyasukh,
  • Kedsarin Pimraksa

摘要

This research investigates the synthesis of environmentally friendly binders, specifically “geopolymer composite materials” using kaolinitic clay and lignite bottom ash as main raw materials with an initial SiO2/Al2O3 molar ratio of 4.0. Additions of different calcium additives viz. Calcium carbonate at CaO/SiO2 molar ratios of 1.0, 2.0, and 3.0 and calcium hydroxide at CaO/SiO2 of 1.0, and different H2O/Na2O ratios of 9.8 and 15.7 are investigated. In addition, curing times (7 and 14 days) are observed to study its effect on mechanical properties of the synthesized geopolymer. The compressive strength of geopolymer materials at 14 days using calcium carbonate with CaO/SiO2 molar ratios of 1.0, 2.0 and 3.0 at H2O/Na2O ratio of 15.7 are 34.7, 26.8, and 24.0 MPa, respectively. At the H2O/Na2O ratio of 9.8, the strength values are 36.5, 28.4, and 18.0 MPa, respectively. The CaO/SiO2 molar ratio of 1.0 shows the highest compressive strength for both H2O/Na2O ratios due to the highest calcium silicate hydrate (CSH) and the geopolymeric phases, which are the binding phases. When compared to the geopolymer material using H2O/Na2O of 9.8 and calcium hydroxide with a CaO/SiO2 ratio of 1.0, it possesses 26.8 MPa at 14 days. At the same CaO/SiO2 ratio, CaCO3 used in the mix provides the stronger geopolymer composite material than Ca (OH)2 because the geopolymer composite with CaCO3 shows the higher CSH content and the denser microstructure than that with Ca (OH)2. However, the geopolymer composite material using Ca (OH)2 demonstrates better CO2 capture under accelerated carbonation than that using CaCO3.