MSA  Vol.4 No.12 A , December 2013
Influence of Comb-Polymer Structure on C3S Phase Hydration
ABSTRACT

The cement hydration delay is due to comb-polymers (PCP), used as dispersant agent during the preparation of the cement paste. In order to evaluate the role of the PCP structure on hydration, the comb-polymer is separated in two main parts: the backbone (PAA) and the dispersing chain. A linear polymer made up of PEO, Mw = 1000, with a carboxylic head suitable to link the inorganic surface, was synthesized to simulate the effect of the dispersing-side chain. The hydration delay of C-S-H formation induced by comb-polymer on CEM I and C3S phase was analyzed by conduction calorimetry and the morphology of the crystalline structure in growth by SEM, specially studying the relation between structure and hydration time. The results show that the hydration delay is mainly ascribable to the comb-shaped structure as a whole, where PEO chain, as from considerations on energy, might assume conformations able to modify the salt concentration near the cement surface. The different hydration rates are tentatively related to the crystal growth and the surface texture observed by SEM.


Cite this paper
L. Eusebio, M. Goisis, G. Manganelli, V. Paternò and P. Gronchi, "Influence of Comb-Polymer Structure on C3S Phase Hydration," Materials Sciences and Applications, Vol. 4 No. 12, 2013, pp. 35-44. doi: 10.4236/msa.2013.412A006.
References
[1]   N. Spiratos, M. Pagé, N. P. Mailvaganam, V. M. Malhotra and C. Jolicoeur, “Superplasticizer for Concrete. Fundamentals, Technology and Practice,” Supplementary Cementing Materials for Sustainable Development Inc., Ottawa, 2003.

[2]   C. Jolicoeur, P. C. Nkinamubanzi, M. A. Simard and M. Piotte, “Progress in Understanding the Functional Properties of Superplasticizers in Fresh Concrete,” 4th CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures, Montreal, 11-13 October 1994, pp. 63-88.

[3]   E. E. Hekal and E. A. Kishar, “Effect of Sodium Salt of Naphthalene-Formaldehyde Polycondensate on Ettringite Formation,” Cement and Concrete Research, Vol. 29, No. 10, 1999, pp. 1535-1540.
http://dx.doi.org/10.1016/S0008-8846(99)00110-6

[4]   H. Sakai, S. Hoshimo, Y. Ohba and M. Daimon, “The Fluidity of Cement Paste with Various Types of Inorganic Powders,” Proceedings of the 10th International Congress on the Chemistry of Cement, Gothenburg, 2-6 June 1997, pp. 19-26.

[5]   V. T. Yilmaz and F. P. Glasser, “Early Hydration of Tricalcium Aluminate-Gypsum Mixtures in the Presence of Sulfonated Melamine Formaldehyde Superplasticizer,” Cement and Concrete Research, Vol. 21, No. 5, 1991, pp. 765-776. http://dx.doi.org/10.1016/0008-8846(91)90172-E

[6]   J. Plank and C. Hirsch, “Impact of Zeta Potential of Early Cement Hydration Phases on Superplasticizer Adsorption,” Cement and Concrete Research, Vol. 37, No. 4, 2007, pp. 537-542.
http://dx.doi.org/10.1016/j.cemconres.2007.01.007

[7]   V. S. Ramachandran, R. M. Paroli, J. J. Beaudoin and A. H. Delgado, “Handbook of Thermal Analysis of Construction Materials,” Wiliam Andrew Publishing, Norwich, New York, 2002.

[8]   F. Winnefeld, S. Becker, J. Pakusch and T. Gtoz, “Effects of the Molecular Architecture of Comb-Shaped Superplasticizers on Their Performance in Cementitious Systems,” Cement and Concrete Composites, Vol. 29, No. 4, 2007 pp. 251-262.
http://dx.doi.org/10.1016/j.cemconcomp.2006.12.006

[9]   V. S. Ramachandran, “Concrete Admixtures Handbook, Properties, Science and Technology,” 2nd Edition, Noyes Publications, Park Ridge, 1995.

[10]   L. Eusebio, “Interactions between New Dispersing Polymer and Cementitous Matrix: Synthesis and Structural Model,” Ph.D. Thesis, Politecnico di Milano, Milano, 2010.

[11]   L. Eusebio, A. Casali, M. Goisis, G. Manganelli and P. Gronchi, “Effect of Superplasticizer Structure on Performance of Portland-Based Cement,” Proceedings of Tenth ACI International Conference on Superplasticizers and Other Chemical Admixtures, Prague, 28-31 October 2012, pp. 381-394.

[12]   M. Palacios, F. Puertas, P. Bowen and Y. F. Houst, “Effect of PCs Superplasticizers on the Rheological Properties and Hydration Process of Slag-Blended Cement Pastes,” Journal of Materials Science, Vol. 44, No. 10, 2009, pp. 2714-2723.
http://dx.doi.org/10.1007/s10853-009-3356-4

[13]   M. Y. A. Mollah, W. J. Adams, R. Schennach and D. L. Cocke, “A Review of Cement-Superplasticizer Interactions and Their Models,” Advances in Cement Research, Vol. 12, No. 4, 2000, pp. 153-161.
http://dx.doi.org/10.1680/adcr.2000.12.4.153

[14]   J. M. Harris, “Introduction to Biotechnical and Biomedical Application of Poly(Ethylene Glycol),” In: J. M. Harris, Ed., Poly(ethylene glycol) Chemistry Biotechnical and Biomedical Applications. Applied Biochemistry and Biotechnology, Humana Press, New York, 1992, pp. 1-14.

[15]   A. Johansson, A. Lauenstein and J. Tegenfeldt, “Effect of Water on Diffusion and Ionic Conductivity in PEG and LiCF3SO3PEG10,” Journal of Physical Chemistry, Vol. 99, No. 16, 1995, pp. 6163-6166.
http://dx.doi.org/10.1021/j100016a061

[16]   K. Tasaki, “Poly(oxyethylene)-Water Interactions: A Molecular Dynamics Study,” Computational and Theoretical Polymer Science, Vol. 9, No. 3-4, 1999, pp. 271-284.
http://dx.doi.org/10.1016/S1089-3156(99)00015-X

[17]   I. F. Hakem and J. Lal, “Evidence of Solvent-Dependent Complexation in Non-Ionic Polymer-Salt Systems,” Applied Physics A: Materials Science & Processing, Vol. 74, Supplement 1, 2002, pp. S531-S533.
http://dx.doi.org/10.1007/s003390201873

[18]   J. H. Park, J.-H. Yum, S.-Y. Kim, Y. S. Kang, Y.-G. Lee, S.-S. Lee and Y. S. Kang, “Influence of Salts on Ionic Diffusion in Oligomer Electrolytes and Its Implication in Dye-Sensitized Solar Cells,” Journal of Photochemistry and Photobiology A: Chemistry, Vol. 194, No. 2-3, 2008, pp. 148-151.
http://dx.doi.org/10.1016/j.jphotochem.2007.08.001

[19]   R. Heeb, S. Lee, N. Venkataraman and N. Spencer, “Influence of Salt on the Aqueous Lubrication Properties of End-Grafted, Ethylene Glycol-Based Self-Assembled Monolayers,” Applied Materials & Interfaces, Vol. 1, No. 5, 2009, pp. 1105-1112.
http://dx.doi.org/10.1021/am900062h

[20]   S. Elli, L. Eusebio, P. Gronchi, F. Ganazzoli and M. Goisis, “Modeling the Adsorption Behavior of Linear EndFunctionalized Poly(ethylene glycol) on an Ionic Substrate by a Coarse-Grained Monte Carlo Approach,” Langmuir, Vol. 26, No. 20, 2010, pp. 15814-15823.
http://dx.doi.org/10.1021/la102962z

[21]   L. Coppola, “Concretum,” McGraw-Hill Companies, Bergamo, 2007.

[22]   M. Palacios, F. Puertas, M. M. Alonso, P. Bowen and Y. F. Houst, “Compatibility of PC Superplasticizers with Slag-Blended Cements,” Proceedings of Ninth ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete, Sevilla, 13-17 October 2009, pp. 97-112.

 
 
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