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This research investigates the synthesis of belite (C2S, Ca2SiO4) cement doped with B3+ ion in order to observe polymorph of C2S using conventional firing method. Belite cement is claimed to be environmentally friendly cement or alternative cement due to its lower temperature production and lower greenhouse emission than ordinary Portland cement. Calcium carbonate and silica which are used as CaO and SiO2 sources, respectively, are calculated according to the stoichiometry of belite cement with CaO/SiO2 molar ratio of 2.0. 1.0 wt% boron oxide (B2O3) is added using different firing temperatures (1,200, 1,300, and 1,400 ˚C) with a rapid air-cooling. Rapid air-cooling and slow cooling are investigated as a comparison at 1,200 ˚C. Various contents of 0, 0.5, 1, and 1.5 wt% B2O3 are studied at 1,200 ˚C with a slow cooling condition. The synthesized cement quality is determined from their mineralogical compositions using X-ray diffractometer. In addition, the synthesized cement quality under different firing temperatures with rapid air-cooling and slow cooling is determined using particle size distribution and surface morphology. The results show that with undoped and rapid air-cooling conditions, C2S contains a beta-belite phase (β-C2S) as a major phase after firing at 1,200 ˚C. For firing at higher temperatures (1,300 ˚C and 1,400˚C), γ-C2S is a major phase. Particle sizes of the synthesized cements slightly increase when compared to their starting raw mix. With an increase in B2O3 content up to 1 wt% B2O3 and rapid air-cooling, belite cement has a larger particle size than undoped belite cement due to more sintering effect and shows a promotion of α’L–C2S when firing temperature increases. γ-C2S phase trends to increase when a fast cooling is applied. In other words, β-C2S is enhanced with a slow cooling.

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Study on Belite Cement Synthesis Doped with Boron Oxide Using Traditional Firing Method

  • 会议论文

  • 发表日期：

    2025年

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  • Chadapohn Tashingkam,
  • Maneerat Thala,
  • Adisak Siyasukh,
  • Kedsarin Pimraksa

摘要

This research investigates the synthesis of belite (C2S, Ca2SiO4) cement doped with B3+ ion in order to observe polymorph of C2S using conventional firing method. Belite cement is claimed to be environmentally friendly cement or alternative cement due to its lower temperature production and lower greenhouse emission than ordinary Portland cement. Calcium carbonate and silica which are used as CaO and SiO2 sources, respectively, are calculated according to the stoichiometry of belite cement with CaO/SiO2 molar ratio of 2.0. 1.0 wt% boron oxide (B2O3) is added using different firing temperatures (1,200, 1,300, and 1,400 ˚C) with a rapid air-cooling. Rapid air-cooling and slow cooling are investigated as a comparison at 1,200 ˚C. Various contents of 0, 0.5, 1, and 1.5 wt% B2O3 are studied at 1,200 ˚C with a slow cooling condition. The synthesized cement quality is determined from their mineralogical compositions using X-ray diffractometer. In addition, the synthesized cement quality under different firing temperatures with rapid air-cooling and slow cooling is determined using particle size distribution and surface morphology. The results show that with undoped and rapid air-cooling conditions, C2S contains a beta-belite phase (β-C2S) as a major phase after firing at 1,200 ˚C. For firing at higher temperatures (1,300 ˚C and 1,400˚C), γ-C2S is a major phase. Particle sizes of the synthesized cements slightly increase when compared to their starting raw mix. With an increase in B2O3 content up to 1 wt% B2O3 and rapid air-cooling, belite cement has a larger particle size than undoped belite cement due to more sintering effect and shows a promotion of α’L–C2S when firing temperature increases. γ-C2S phase trends to increase when a fast cooling is applied. In other words, β-C2S is enhanced with a slow cooling.