Title:
Influence of Non-adsorbed Polymers on Fluidity of Cement Paste
Author(s):
Kazuki Matsuzawa, Daiki Shimazaki, Hirokatsu Kawakami, and Etsuo Sakai
Publication:
Symposium Paper
Volume:
329
Issue:
Appears on pages(s):
267-278
Keywords:
chemical admixture; cement paste; fluidity; non-adsorbed superplasticizer; low water-cement ratio; density of functional groups
DOI:
10.14359/51711220
Date:
9/26/2018
Abstract:
In cement paste with low water-powder ratio, non-adsorbed superplasticizer molecules increase the fluidity of paste, but their function is not investigated in detail. This study investigates the influence of non-adsorbed superplasticizer on the fluidity of cement paste using several superplasticizers having different molecular structures. The paste consisted of belite-rich low-heat Portland cement, ultra-fine silica particle, and polycarboxylate-based superplasticizer solution. First, a superplasticizer having moderate amount of functional groups was added to the paste, and adsorption was saturated. Subsequently, another superplasticizer was added. The influence of subsequent addition was related to the molecular structure of another superplasticizer. Another superplasticizer having few functional groups decreased adsorption of the first superplasticizer but the fluidity did not change. Another superplasticizer having moderate functional groups did not change adsorption but increased the fluidity. Another superplasticizer having many functional groups increased adsorption but decreased the fluidity.
Related References:
1. Nagaraj, T. S., and Banu, Z., “Generalization of Abrams’ Law,” Cement and Concrete Research, V. 26, No. 6, 1996, pp. 933-942. doi: 10.1016/0008-8846(96)00065-8
2. Nishiyama, M., “Mechanical Properties of Concrete and Reinforcement — State-of-the-art Report on HSC and HSS in Japan,” Journal of Advanced Concrete Technology, V. 7, No. 2, 2009, pp. 157-182. doi: 10.3151/jact.7.157
3. Diamond, S., “Physical and chemical characteristics of cement composites,” Durability of Concrete and Cement Composites, Woodhead Publishing Limited, 2007, pp. 10-44.
4. Schröfl, C.; Gruber, M.; and Plank, J., “Preferential adsorption of polycarboxylate superplasticizers on cement and silica fume in ultra-high performance concrete (UHPC),” Cement and Concrete Research, V. 42, No. 11, 2012, pp. 1401-1408. doi: 10.1016/j.cemconres.2012.08.013
5. Maruyama, I., and Teramoto, A., “Temperature dependence of autogenous shrinkage of silica fume cement pastes with a very low water–binder ratio,” Cement and Concrete Research, V. 50, 2013, pp. 41-50. doi: 10.1016/j.cemconres.2013.03.017
6. Sarkar, S. L., and Aïtcin, P.-C., “Dissolution rate of silica fume in very high strength concrete,” Cement and Concrete Research, V. 17, No. 4, 1987, pp. 591-601. doi: 10.1016/0008-8846(87)90132-3
7. Chatterjee, A. K., “High belite cements—Present status and future technological options: Part I,” Cement and Concrete Research, V. 26, No. 8, 1996, pp. 1213-1225. doi: 10.1016/0008-8846(96)00099-3
8. Uchikawa, H.; Ogawa, K.; and Uchida, S., “Influence of character of clinker on the early hydration process and rheological property of cement paste,” Cement and Concrete Research, V. 15, No. 4, 1985, pp. 561-572. doi: 10.1016/0008-8846(85)90053-5
9. Rößler, C.; Eberhardt, A.; Kučerová, H.; and Möser, B., “Influence of hydration on the fluidity of normal Portland cement pastes,” Cement and Concrete Research, V. 38, No. 7, 2008, pp. 897-906. doi: 10.1016/j.cemconres.2008.03.003
10. Sakai, E.; Kakinuma, Y.; Yamamoto, K.; and Daimon, M., “Relation between the Shape of Silica Fume and the Fluidity of Cement Paste at Low Water to Powder Ratio,” Journal of Advanced Concrete Technology, V. 7, No. 1, 2009, pp. 13-20. doi: 10.3151/jact.7.13
11. Plank, J.; Schroefl, C.; Gruber, M.; Lesti, M.; and Sieber, R., “Effectiveness of Polycarboxylate Superplasticizers in Ultra-High Strength Concrete: The Importance of PCE Compatibility with Silica Fume,” Journal of Advanced Concrete Technology, V. 7, No. 1, 2009, pp. 5-12. doi: 10.3151/jact.7.5
12. Ganesh Babu, K., and Surya Prakash, P. V., “Efficiency of silica fume in concrete,” Cement and Concrete Research, V. 25, No. 6, 1995, pp. 1273-1283. doi: 10.1016/0008-8846(95)00120-2
13. Sakai, E.; Yamada, K.; and Ohta, A., “Molecular Structure and Dispersion-Adsorption Mechanisms of Comb-Type Superplasticizers Used in Japan,” Journal of Advanced Concrete Technology, V. 1, No. 1, 2003, pp. 16-25. doi: 10.3151/jact.1.16
14. Yoshioka, K.; Tazawa, E.; Kawai, K.; and Enohata, T., “Adsorption characteristics of superplasticizers on cement component minerals,” Cement and Concrete Research, V. 32, No. 10, 2002, pp. 1507-1513. doi: 10.1016/S0008-8846(02)00782-2
15. Ushiro, M.; Atarashi, D.; Kawakami, H.; and Sakai, E., “The Effect of Superplasticizer Present in Pore Solution on Flowability of Low Water-to-Powder Cement Paste,” Cement Science and Concrete Technology, V. 67, No. 1, 2013, pp. 102-107. doi: (in Japanese)10.14250/cement.67.102
16. 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
17. Lange, A., and Plank, J., “Contribution of non-adsorbing polymers to cement dispersion,” Cement and Concrete Research, V. 79, 2016, pp. 131-136. doi: 10.1016/j.cemconres.2015.09.003
18. de Larrard, F., “Ultrafine particles for the making of very high strength concretes,” Cement and Concrete Research, V. 19, No. 2, 1989, pp. 161-172. doi: 10.1016/0008-8846(89)90079-3
19. Matsuzawa, K.; Atarashi, D.; Miyauchi, M.; and Sakai, E., “Interactions between fluoride ions and cement paste containing superplasticizer,” Cement and Concrete Research, V. 91, 2017, pp. 33-38. doi: 10.1016/j.cemconres.2016.10.006
20. Sakai, E.; Masuda, K.; Kakinuma, Y.; and Aikawa, Y., “Effects of Shape and Packing Density of Powder Particles on the Fluidity of Cement Pastes with Limestone Powder,” Journal of Advanced Concrete Technology, V. 7, No. 3, 2009, pp. 347-354. doi: 10.3151/jact.7.347