Hostname: page-component-745bb68f8f-mzp66 Total loading time: 0 Render date: 2025-01-15T05:59:59.243Z Has data issue: false hasContentIssue false
  • English
  • Français

Changes Induced by PVA in the Cement Microstructure Surrounding Aggregate

Published online by Cambridge University Press:  21 February 2011

Un-Jen Chu ,
Jae-Ho Kim ,
Cheol Park  and
Richard E. Robertson
Un-Jen Chu
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Jae-Ho Kim
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Cheol Park
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Richard E. Robertson
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Get access

Abstract

The presence of poly(vinyl alcohol) (PVA) in portland cement during its hydration was found to induce changes in the microstructure and behavior of the paste that forms around aggregate. The microstructure was studied with scanning electron microscopy in secondary electron, backscattered electron, and EDX mapping modes and with Fourier-transform infraredspectroscopy. The adhesion between cement paste and aggregate was examined with planar aggregate surfaces. With concentrations of the order of 1% by weight of PVA based onthe weight of the cement, the deposition of calcium hydroxide on the aggregate surface was found to be diminished and the porous layer that usually surrounds the aggregate to be reduced in thickness. Also, the bond between the aggregate and cement paste was increasedenough for the bond to approach the strength of the cement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 370: Symposia Va/Vb – Microstructure of Cement-Based Systems/Bonding and Interfaces in Cement... , 1994 , 347
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Mehta, P.K. and Monteiro, P.J.M., Concrete: Structure, Properties, and Materials, 2nd ed. (Prentice Hall, Englewood Cliffs, NJ, 1993), pp 36–41.Google Scholar
2. Mehta, P.K. and Monteiro, P.J.M., in Bonding in Cementitious Composites, edited by Mindess, S. and Shah, S.P. (Mater. Res. Soc. Proc. 114, Pittsburgh, PA, 1988) pp. 65–75.Google Scholar
3. Bentur, A., Diamond, S., and Mindess, S., J. Mater. Sci., 20, 3610 (1985).Google Scholar
4. Barnes, B.D., Diamond, S., Dolch, W.L., Cement Concr. Res., 8, 233 (1978).Google Scholar
5. Monteiro, P.J.M., Maso, J.C., and Ollivier, J.P., Cement Concr. Res., 15, 953 (1985).Google Scholar
6. Monteiro, P.J.M. and Mehta, P.K., Cement Concr. Res., 15, 378 (1985).Google Scholar
7. Diamond, S., in Microstructural Development During the Hydration of Cement, edited by Struble, L.J. and Brown, P.W. (Mater. Res. Soc. Proc. 85, Pittsburgh, PA, 1987) pp. 21–31.Google Scholar
8. Scrivener, K.L., Bentur, A., and Pratt, P.L., Adv. Cement Res., 1, 230 (1988).Google Scholar
9. Mitsui, K., Li, Z., Lange, D.A., and Shah, S.P., ACI Mater. J., 91, 30 (1994).Google Scholar
10. Najm, H., Naaman, A.E., Chu, T.-J., and Robertson, R.E., Adv. Cement-Based Mater., 1, 115 (1994).Google Scholar
11. Chu, T.-J., Robertson, R.E., Najm, H., and Naaman, A.E., Adv. Cement-Based Mater., 1, 122 (1994).Google Scholar
12. Kim, J. K., Robertson, R.E., and Chu, T.-J., to be published.Google Scholar