Possible Fractal Structure of Cement Gels
The understanding of the mechanism by which a newly mixed cement turns into a gel structure which gives it rigidity and compressive strength remains poorly understood. Recently, however, new light has been shed on the hydration process in an extensive series of measurements using small-angle neutron scattering (SANS) in which the evolution of the scattering has been studied as a function of time 1, 2, 3. The most detailed work has been carried out on Ordinary Portland Cement (OPC), but experiments on other starting materials show very little difference in the evolution of the scattering (though the time-scales may differ) and in the final product.
KeywordsCalcium Hydroxide Ordinary Portland Cement Surface Fractal Dimension Calcium Hydroxide Solution Aged Cement
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- 1.D. Pearson, A. J. Allen and C. G. Windsor, An investigation on the nature of porosity in hardened cement parts, M. McN. Alford and D. D. Double, J. Mat. Sci. 18: 430 (1983)Google Scholar
- 2.A. J. Allen and D. Pearson, Porosity and gel structure of cement, in “Microstructural characterisation of materials”, N.H. Anderson et al, eds. Risi National Laboratory, Roskilde, Denmark, (1984)Google Scholar
- 3.D. Pearson and A. J. Allen, A study of ultrafine porosity in hydrated cements, J. Mat. Sci. 20:303 (1985)Google Scholar
- 4.P. Meakin, Diffusion controlled cluster formation in 2–6 dimensional space, Phys. Rev. A., 27: 1495 (1983)Google Scholar
- 5.D. D. Double, An examination of hydration of Portland cement by electron microscopy, Silicate industrielle 11: 233, (1978).Google Scholar