Skip to main content
SpringerLink
Log in

Synthesis of ettringite from portlandite suspensions at various Ca/Al ratios

  • Published:
Inorganic Materials Aims and scope

Abstract

Synthesis of ettringite, Ca6Al2(OH)12(SO4)3·26H2O has been attempted in suspensions of portlandite, Ca(OH)2 under CO2-free condition, agitating by a magnetic stirrer for constant 3 h at room temperature. Al-sulfate hydrate, Al2(SO4)3·(14–18)H2O solution (0.01 M) was used for Al2O3 and SO3 sources and appropriate amount of portlandite was mixed with the solution together with sucrose for boosting portlandite dissolution. The Ca/Al atomic ratio in suspensions was varied from 1.0 to 5.0 at intervals of 0.5. Run products were collected by filtration and washing and air-dried and evaluated by XRD, XRF, and RF-SEM. No ettringite formed at Ca/Al = 1.0, but ettringite began to form at Ca/Al = 1.5 and over. Measurement of pH of supernatants indicated pH 9.86 as a critical point of ettringite formation, and this mineral was always identified in a pH region above this point. Minute crystallites of ettringite were obtained up to 2 μm. The Yield of ettringite was suspended around 95 wt% as dry-base even in stoichiometric mixing due to the presence of portlandite remaining undissolved as relicts. As a consequence, no marked difference of the yield was found among Ca/Al 2.0 to 3.5 runs. The remaining portlandite was apt to decompose into crystalline calcite during the air-dry process. However, formation of amorphous calcite was estimated in some runs during this decomposition process.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Bannister, F.A., Hey, M., and Bernal, J.D., Ettringite from Scawt Hill, Co. Antrim, Mineral. Mag., 1936, vol. 24, pp. 324–329.

    Article  CAS  Google Scholar 

  2. Deb, S.K., Manghnani, M.H., Ross, K., et al., Raman Scattering and X-ray Diffraction Study of the Thermal Decomposition of an Ettringite-Group Crystal, Phys. Chem. Miner., 2003, vol. 30, no. 1, pp. 31–38.

    Article  CAS  Google Scholar 

  3. Yamaguchi, G., Uchikawa, H., Takagi, S., and Tukiyama, K., Calcium-Fluoroaluminate and Ferrite Phases in Regulated Set Cement, Cem. Sci. Concr. Technol., 1972, vol. 26, pp. 41–48.

    Google Scholar 

  4. Uchikawa, H. and Matsuzaki, Y., A Newly Developed Epoch-Making Super High Early Strength Cement, Bull. Ceram. Soc. Jpn., 1972, vol. 7, no. 4, pp. 249–261.

    CAS  Google Scholar 

  5. Viswanathan, V.N., Raina, S.J., and Chatterjee, A.K., An Exploratory Investigation on Porsal Cement, World Cem. Technol., 1978, vol. 9, pp. 109–118.

    CAS  Google Scholar 

  6. Ikeda, K., Cements along the Join C4A3S-C2S, Proc. 7th Int. Symp. Chem. Cement., Paris, 1980, vol. 3, pp. III-31–III-36.

    Google Scholar 

  7. Takehiro, M., Hydration and Setting of Portland Cement Added with Calcium Aluminate-Based Setters, Doctoral Dissertation, Yamaguchi Univ., 2000, p. 90.

  8. Moore, A.E. and Taylor, H.F.W., Crystal Structure of Ettringite, Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem., 1970, vol. 26, pp. 386–393.

    Article  CAS  Google Scholar 

  9. Yamada, H., Inorganic Materials for Papermaking, Bull. Ceram. Soc. Jpn., 1982, vol. 12, no. 2, pp. 159–163.

    Google Scholar 

  10. Hirano, Y., Makida, K., Komatsu, R., and Ikeda, K., Dimensional Change of Self-leveling Materials Based on Aluminous Cement-Portland Cement-Anhydrite, Cem. Sci. Concr. Technol., 2004, vol. 58, pp. 81–86.

    CAS  Google Scholar 

  11. Koyanagi, W., Rokugou, K., Oono, S., and Mutou, T., Concrete Demolishing by the Static Crush Agent, Cem. Sci. Concr. Technol., 1982, vol. 36, pp. 179–182.

    Google Scholar 

  12. Diamond, S. and Lachowski, E.E., Investigations of the Composition and Morphology of Individual Particles of Portland Cement Paste: Calcium Sulfoaluminates, Cem. Concr. Res., 1983, vol. 13, pp. 335–340.

    Article  CAS  Google Scholar 

  13. Bentur, A. and Ish-Shalom, M., Properties of Type K Expansive Cement of Pure Components, Cem. Concr. Res., 1974, vol. 4, pp. 709–721.

    Article  CAS  Google Scholar 

  14. Mehta, P.K., Mechanism of Expansion Associated with Ettringite Formation, Cem. Concr. Res., 1973, vol. 3, pp. 1–6.

    Article  CAS  Google Scholar 

  15. Myneni, S.C.B., Traina, S.J., and Logan, T.J., Ettringite Solubility and Geochemistry of the Ca(OH)2-Al2(SO4)3-H2O System at 1 atm Pressure and 298 K, Chem. Geol., 1998, vol. 148, pp. 1–19.

    Article  CAS  Google Scholar 

  16. Satoh, K., Morinaga, H., Tokumitu, T., et al., Removement of Fluoride Ion by Ettringite, 18th Fall Meet. of the Ceramic Society of Japan, 2005, p. 168.

  17. Pöllmann, H., Kuzel, H.J., and Wenda, R., Solid Solution of Ettringites: Part I. Incorporation of OH− and C 2−3 in 3CaO·Al2O3·3CaSO4·32H2O, Cem. Concr. Res., 1990, vol. 20, pp. 941–947.

    Article  Google Scholar 

  18. Barnctt, S.J., Macphee, D.E., Lachowski, E.E., and Crammond, N.J., XRD, EDX, and IR Analysis of Solid Solutions between Thaumasite and Ettringite, Cem. Concr. Res., 2002, vol. 32, pp. 719–730.

    Article  Google Scholar 

  19. Alvarez-Ayuso, E. and Nugteren, H.W., Synthesis of Ettringite: A Way to Deal with the Acid Wastewaters of Aluminium Anodizing Industry, Water Res., 2005, vol. 39, pp. 65–72.

    Article  CAS  Google Scholar 

  20. Hampson, C.J. and Bailey, J.E., On the Structure of Some Precipitated Calcium Alumino-Sulphate Hydrates, J. Mater. Sci., 1982, vol. 17, pp. 3341–3346.

    Article  CAS  Google Scholar 

  21. Damidot, D. and Glasser, F.P., Thermodynamic Investigation of the CaO-Al2O3-CaSO4-H2O System at 50°C and 85°C, Cem. Concr. Res., 1992, vol. 22, pp. 1179–1191.

    Article  CAS  Google Scholar 

  22. Gabrisová, A. and Havlica, J., Stability of Calcium Sulphoaluminate Hydrates in Water Solutions with Various pH Values, Cem. Concr. Res., 1991, vol. 21, pp. 1023–1027.

    Article  Google Scholar 

  23. Barnett, S.J., Adam, C.D., and Jackson, A.R.W., An XRPD Profile Fitting of the Solid Solution between Ettringite, Ca6Al2(SO4)3(OH)12·26H2O, and Carbonate Ettringite, Ca6Al2(CO3)3(OH)12·26H2O, Cem. Concr. Res., 2001, vol. 31, pp. 13–17.

    Article  CAS  Google Scholar 

  24. Shimada, Y. and Young, J.F., Thermal Stability of Ettringite in Alkaline Solutions at 80°C, Cem. Concr. Res., 2004, vol. 34, pp. 2261–2268.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Advanced Materials Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, 755-861, Japan

    T. Terai, Y. Nakamura & K. Ikeda

  2. Yamaguchi Prefectural Industrial Technology Institute, 4-1-1 Asutopia, Ube, 755-0195, Japan

    A. Mikuni

Authors
  1. T. Terai
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Mikuni
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Y. Nakamura
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. K. Ikeda
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

The text was submitted by the authors in English.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Terai, T., Mikuni, A., Nakamura, Y. et al. Synthesis of ettringite from portlandite suspensions at various Ca/Al ratios. Inorg Mater 43, 786–792 (2007). https://doi.org/10.1134/S0020168507070205

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0020168507070205

Keywords

Search

Navigation