8.
J. H. Sharp, C. D. Lawrence, Adv. Cem. Res., 11, 3–13 (1999). 6. H. W. Taylor, Cement Chemistry, Academic Press, London, UK 1990. 7. V. I. E. Ajiwe, C. A. Okeke, F. C. Akigwe, Bioresour. Technol., 73, 1, 37–39 (2000). 8. J. R. Pan, C. Huang, S. Lin, Water Sci. Technol., 50, 9, 183–188 (2004).