Title:
Effect of Mixing Speed on Rheology of Superplasticized Portland Cement and Limestone Powder Pastes
Author(s):
Dongyeop Han and Raissa Douglas Ferron
Publication:
Materials Journal
Volume:
114
Issue:
4
Appears on pages(s):
559-569
Keywords:
cement paste; chemical admixture; foaming; limestone powder; mixing intensity; rheology
DOI:
10.14359/51689481
Date:
7/1/2017
Abstract:
This paper examines the effect of mixing intensity on superplasticized cement pastes and reference limestone pastes; specifically, the effects of high mixing intensity on the rheological properties were examined. Increasing the mixing intensity applied to a paste does not always cause a reduction in the rheological properties of the paste, especially when the pastes contain a high-range waterreducing admixture (HRWRA). Mechanisms underlying this effect were examined. The physical effects due to cement being a powder material cannot solely explain the behavior seen; rather, the chemical effects from cement being hydraulic, as well as the amount of foaming of the incorporated admixture, play a role. Pastes prepared with an HRWRA that had a high degree of foaming exhibited greater increases in their rheological response than pastes prepared with HRWRAs containing low foaming potential, which suggests that the air bubbles in the foam network act as rigid inclusions instead of soft, deformable inclusions.
Related References:
1. Helmuth, R.; Hills, L. M.; Whiting, D. A.; and Bhattacharja, S., “Abnormal Concrete Performance in the Presence of Admixtures,” Portland Cement Association, Skokie, IL, 1995, 94 pp.
2. Prasittisopin, L., and Trejo, D., “Effects of Mixing Variables on Hardened Characteristics of Portland Cement Mortars,” ACI Materials Journal, V. 112, No. 3, May-June 2015, pp. 399-408. doi: 10.14359/51686973
3. Dils, J.; De Schutter, G.; and Boel, V., “Influence of Mixing Procedure and Mixer Type on Fresh and Hardened Properties of Concrete: A Review,” Materials and Structures, V. 45, No. 11, 2012, pp. 1673-1683. doi: 10.1617/s11527-012-9864-8
4. Lowke, D., and Schiessl, P., “Effect of Mixing Energy on Fresh Properties of SCC,” Proceedings of the 4th International RILEM Symposium on Self-Compacting Concrete (SCC2005), Chicago, IL, 2005, pp. 2-7.
5. Trejo, D., and Chen, J., “Influence of Mixing Time on Fresh and Hardened Concrete Characteristics,” ACI Materials Journal, V. 112, No. 6, Nov.-Dec. 2015, pp. 745-753. doi: 10.14359/51687396
6. Ferraris, C. F.; Obla, K. H.; and Hill, R., “The Influence of Mineral Admixtures on the Rheology of Cement Paste and Concrete,” Cement and Concrete Research, V. 31, No. 2, 2001, pp. 245-255. doi: 10.1016/S0008-8846(00)00454-3
7. ASTM C305-12, “Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency,” ASTM International, West Conshohocken, PA, 2012, 3 pp.
8. Williams, D. A.; Saak, A. W.; and Jennings, H. M., “The Influence of Mixing on the Rheology of Fresh Cement Paste,” Cement and Concrete Research, V. 29, No. 9, 1999, pp. 1491-1496. doi: 10.1016/S0008-8846(99)00124-6
9. Ferraris, C. F., “Measurement of the Rheological Properties of Cement Paste: A New Approach,” International RILEM Conference on the Role of Admixtures in High Performance Concrete, 1999, pp. 333-342.
10. ASTM C1738-11, “Standard Practice for High-Shear Mixing of Hydraulic Cement Pastes,” ASTM International, West Conshohocken, PA, 2011, 3 pp.
11. American Petroleum Institute, “Specification for Cements and Materials for Well Cementing (ANSI/API Spec 10A),” API, Washington, DC, 2010, 38 pp.
12. Spiratos, N.; Pagé, M.; and Mailvaganam, N., “Superplasticizers for Concrete: Fundamentals, Technology, and Practice,” Supplementary Cementing Materials for Sustainable Development Inc., Ottawa, ON, Canada, 2003, 322 pp.
13. Mindess, S.; Young, J.; and Darwin, D., Concrete, Prentice Hall, Englewood Cliffs, NJ, 2002, 644 pp.
14. Flatt, R. J.; Houst, Y. F.; Bowen, P.; and Hofmann, H., “Electrosteric Repulsion Induced by Superplasticizers between Cement Particles—An Overlooked Mechanism?” Superplasticizers and Other Chemical Admixtures in Concrete, Proceedings of the Sixth International CANMET/ACI Conference, SP-195, V. M. Malhotra, ed., 2000, pp. 29-42.
15. Alargova, R.; Warhadpande, D.; Paunov, V. N.; and Velev, O. D., “Foam Superstabilization by Polymer Microrods,” Langmuir, V. 20, No. 24, 2004, pp. 10,371-10,374. doi: 10.1021/la048647a
16. Lange, A., and Plank, J., “Study on the Foaming Behaviour of Allyl Ether-Based Polycarboxylate Superplasticizers,” Cement and Concrete Research, V. 42, No. 2, 2012, pp. 484-489. doi: 10.1016/j.cemconres.2011.11.017
17. Wang, L. Y.; Wang, Y. W.; Gao, G. B.; Chu, Z. P.; Liu, Y. S.; Wang, K. Y.; and Zhou, X. Z., “Synthesis and Performance of Polycarboxylate Superplasticizers with Hydrophobic Side Chains,” Applied Mechanics and Materials, V. 357, 2013, pp. 1124-1129. doi: 10.4028/www.scientific.net/AMM.357-360.1124
18. Han, D., and Ferron, R., “Effect of Mixing Method on Microstructure and Rheology of Cement Paste,” Construction and Building Materials, V. 93, 2015, pp. 278-288. doi: 10.1016/j.conbuildmat.2015.05.124
19. Han, D., “Flow Behavior and Microstructure of Cement-Based Materials,” PhD dissertation, University of Texas at Austin, Austin, TX, 2014, 229 pp.
20. ASTM C150/C150M-12, “Standard Specification for Portland Cement,” ASTM International, West Conshohocken, PA, 2012, 9 pp.
21. Mikanovic, N., and Jolicoeur, C., “Influence of Superplasticizers on the Rheology and Stability of Limestone and Cement Pastes,” Cement and Concrete Research, V. 38, No. 7, 2008, pp. 907-919. doi: 10.1016/j.cemconres.2008.01.015
22. Vance, K.; Arora, A.; Sant, G.; and Neithalath, N., “Rheological Evaluations of Interground and Blended Cement-Limestone Suspensions,” Construction and Building Materials, V. 79, 2015, pp. 65-72. doi: 10.1016/j.conbuildmat.2014.12.054
23. Ferraris, C. F.; Li, Z.; Mohseni, M.; and Franson, N., “Reference Materials for Rheometers and the ASTM Flow Table,” 3rd International RILEM Symposium Rheololgy of Cement Suspensions such as Fresh Concrete, O. H. Wallevik, S. Kubens, and S. Oesterheld, eds., 2009, pp. 257-264.
24. Mikanovic, N.; Khayat, K.; Pagé, M.; and Jolicoeur, C., “Aqueous CaCO3 Dispersions as Reference Systems for Early-Age Cementitious Materials,” Colloids and Surfaces. A, Physicochemical and Engineering Aspects, V. 291, No. 1-3, 2006, pp. 202-211. doi: 10.1016/j.colsurfa.2006.06.042
25. Ferron, R.; Shah, S.; Fuente, E.; and Negro, C., “Aggregation and Breakage Kinetics of Fresh Cement Paste,” Cement and Concrete Research, V. 50, 2013, pp. 1-10. doi: 10.1016/j.cemconres.2013.03.002
26. Plank, J.; Sakai, E.; Miao, C. W.; Yu, C.; and Hong, J. X., “Chemical Admixtures—Chemistry, Applications and their Impact on Concrete Microstructure and Durability,” Cement and Concrete Research, V. 78, 2015, pp. 81-99. doi: 10.1016/j.cemconres.2015.05.016
27. Dackzo, C., and Joe, D., “Not All Applications Are Created Equal; Selecting the Appropriate SCC Performance Targets,” First North American Conference Describing the Use of Self Consolidating Concrete, 2002, pp. 179-184.
28. Feys, D.; Roussel, N.; Verhoeven, R.; and De Schutter, G., “Influence of Air Bubbles Size and Volume Fraction on Rheological Properties of Fresh Self-Compacting Concrete,” 3rd International RILEM Symposium Rheololgy of Cement Suspensions Such as Fresh Concrete, O. H. Wallevik, S. Kubens, and S. Oesterheld, eds., 2009, pp. 113-120.
29. Kundu, P. K., and Cohen, I. M., Fluid Mechanics, Elsevier, Oxford, San Diego, CA, 2008, 921 pp.