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Early age microstructure of the paste-aggregate interface and its evolution

Published online by Cambridge University Press:  31 January 2011

Davide Zampini ,
Surendra P. Shah  and
Hamlin M. Jennings
Davide Zampini
Affiliation:
Department of Civil Engineering, NSF Center for Advanced Cement-Based Materials, Northwestern University, Evanston, Illinois 60208
Surendra P. Shah
Affiliation:
Department of Civil Engineering, NSF Center for Advanced Cement-Based Materials, Northwestern University, Evanston, Illinois 60208
Hamlin M. Jennings
Affiliation:
Department of Civil Engineering and Department of Materials Science and Engineering, NSF Center for Advanced Cement-Based Materials, Northwestern University, Evanston, Illinois 60208
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The sequence of microstructural changes occurring at the wet paste-aggregate interface is documented at an age as early as 5 min using the environmental scanning electron microscope (ESEM). Unlike other microscopic techniques, the ESEM allows pastes of normal water: cement ratio to be observed at early ages without reducing the paste to a powder. Evolution of the paste-aggregate microstructure is followed up to an age of 24 h. The region adjacent to the aggregate surface contains a phase with a morphology referred to as a “sheaf of wheat” morphology. The same interfacial region in a 10-day-old specimen has a microstructure similar to the interfacial transition zone (ITZ) reported in the literature. Variations of the “sheaf of wheat” morphology due to original water-to-cement ratio, mixing energy, incorporation of silica fume, and drying are documented. As revealed by energy dispersive x-ray analysis (EDS), the microstructure contains significant amounts of calcium and silica. These results indicate that the observed morphology is likely to be a calcium silicate hydrate (C-S-H) product that is a precursor to type I C-S-H. A description of the evolution of the observed microstructural features is presented. The “sheaf of wheat” morphology appears to be a general precursor to morphologies commonly seen in mature pastes.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 1888 - 1898
Copyright
Copyright © Materials Research Society 1998

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References

1.Barnes, B. D., Diamond, S., and Dolch, W. L., Cem. Conc. Res. 8, 233 (1978).CrossRefGoogle Scholar
2.Barnes, B. D., Diamond, S., and Dolch, W. L., J. Am. Ceram. Soc. 62 (1,2), 21 (1978).CrossRefGoogle Scholar
3.Scrivener, K. L. and Pratt, P. L., in A Preliminary Study of the Microstructure of the Cement/Sand Bond in Mortars (8th Int. Congress on the Chemistry of Cement, Rio de Janiero 3, Abla Grafica e Editora, Rio de Janiero, Brazil, 1986), p. 466.Google Scholar
4.Scrivener, K. L. and Gartner, E. M., in Bonding in Cementitious Composites, edited by Mindess, S. and Shah, S. P. (Mater. Res. Soc. Symp. Proc. 114, Pittsburgh, PA, 1988), pp. 77–88.Google Scholar
5.Ollivier, J. P. and Massat, M., in Microstructure of the Paste-Aggregate Interface, Including the Influence of Mineral Additions, edited by Grutzeck, M. W. and Sarkar, S. L. (Advances in Cement and Concrete, American Society of Civil Engineers, New York, 1994), p. 175.Google Scholar
6.Larbi, J. A. and Bijen, J. M. J. M., Cem. Conc. Res. 20, 461 (1990).CrossRefGoogle Scholar
7.Monteiro, P. J. M., Maso, J. C., and Ollivier, J. P., Cem. Conc. Res. 15, 953 (1985).CrossRefGoogle Scholar
8.Monteiro, P. J. M. and Ostertag, C. P., Cem. Conc. Res. 19, 987 (1989).CrossRefGoogle Scholar
9.Grandet, J. and Ollivier, J. P., in Proceedings of the 7th International Congress on Chemistry of Cement, Paris, Vol. III (Editions Septima, Paris, 1980), pp. VII–85.Google Scholar
10.Diamond, S., Mindess, S., and Lovell, J., in On the Spacing Between Aggregate Grains in Concrete and the Dimensions of the Aureole de Transition (Liasons de Ciment Mater. Assoc. Proceedings of RILEM Colloq., Toulouse, France, 1982), p. c-42.Google Scholar
11.Jennings, H. M., Dalgleish, B. J., and Pratt, P. L., J. Am. Ceram. Soc. 64, 567 (1981).CrossRefGoogle Scholar
12.Grudemo, A., in The Chemistry of Cements, edited by Taylor, H. F. W. (Academic Press, New York, 1964), p. 371.Google Scholar
13.Grudemo, A., C.B.I. Proc. 26, 1–103 (1955).Google Scholar
14.Ciach, T. D., Gillot, J. E., Swenson, E. G., and Sereda, P. J., Cem. Concr. Res. 1, 13–25 (1971).CrossRefGoogle Scholar
15.Jennings, H. M. and Pratt, P. L., J. Mater. Sci. 15, 250–253 (1980).CrossRefGoogle Scholar
16.Tiegs, T. N., M. Sc. Thesis, University of Illinois, Urbana-Champaign, IL (1975).Google Scholar
17.Dalgleish, B. J., Pratt, P. L., and Moss, R. I., Cem. Concr. Res. 10, 665–676 (1980).CrossRefGoogle Scholar
18.Marchese, B., J. Am. Ceram. Soc. 61, 349–355 (1978).CrossRefGoogle Scholar
19.Goto, S., Daimon, M., Hosaka, G., and Kondo, R., J. Am. Ceram. Soc. 59, 281 (1976).CrossRefGoogle Scholar
20.Ben-Dor, L. and Perez, D., J. Mater. Sci. 11, 239–245 (1976).CrossRefGoogle Scholar
21.Stucke, M. S. and Majumdar, A. J., Cem. Concr. Res. 7, 711–718 (1977).CrossRefGoogle Scholar
22.Diamond, S., in Cement Paste Microstructure: An Overview at Several Levels (Conf. Proc. on Hydraulic Cement Pastes: Their Structure and Properties, Cement and Concrete Association, Slough, UK, 1976), p. 2.Google Scholar
23.Williamson, R. B., J. Cryst. Growth 3 (4), 787 (1968).CrossRefGoogle Scholar
24.Goto, S., Daimon, M., Hosaka, G., and Kondo, R., ibid. 59, 281–285 (1976).Google Scholar
25.Rashed, A. I. and Williamson, R. B., J. Mater. Res. 6, 2004 (1991).CrossRefGoogle Scholar
26.Rashed, A. I. and Williamson, R. B., J. Mater. Res. 6, 2474 (1991).CrossRefGoogle Scholar
27.Williamson, R. B. and Markiewicz, R. S., Report R68-57, Dept. of Civil Engineering, M.I.T., Cambridge, Massachusetts (1968).Google Scholar
28.Buckley, H. E., Crystal Growth (John Wiley, New York, 1951), p. 500.Google Scholar
29.Wu, Z.-Q. and Young, J. F., J. Am. Ceram. Soc. 67, 48 (1984).CrossRefGoogle Scholar
30.Tardos, M. E., Skalny, J., and Kalyoncu, R. S., J. Am. Ceram. Soc. 59, 344 (1976).Google Scholar
31.Young, J. F., Tong, H-S., and Berger, R. L., J. Am. Ceram. Soc. 60 (5–6), 193 (1977).CrossRefGoogle Scholar
32.Slegers, P. A. and Rouxhet, P. G., Cem. Conc. Res. 7, 31 (1977).CrossRefGoogle Scholar
33.Thomas, N. L. and Double, D. D., Cem. Conc. Res. 11, (5/6), 675 (1981).CrossRefGoogle Scholar
34.Bonen, D., J. Am. Ceram. Soc. 77 (1), 193 (1994).CrossRefGoogle Scholar
35.Bonen, D. and Diamond, S., in Application of Image Analysis to a Comparison of Ball Mill and High Pressure Roller Mill Ground Cement (Proc. 13th Int. Conference on Cement Microscopy, Tampa, FL, International Cement Microscopy Association, Duncanville, TX, 1991), p. 101.Google Scholar
36.Ings, J. B., Brown, P. W., and Frohnsdorff, G., Cem. Conc. Res. 13(6), 843 (1983).CrossRefGoogle Scholar
37.Sierra, R., Ph.D. Thesis, University of Rennes, Feb. 1974.Google Scholar