Performance Change in Superplasticizers after Thermal Stimulation

Abstract:

Polycarboxylic acid-based superplasticizers are used for all types of concrete, but it is not well known that their fundamental performance changes with heating. Previous research confirmed that the superplasticizer storage environment changes its physical properties, which in turn changes the fluidity and workability of concrete or mortar. Therefore, this study confirmed the thermal stimulation effect on polycarboxylic acid-based and other superplasticizers and also confirmed the mechanism of polymer “entanglement” using superplasticizers that were centrifuged to simulate long-term storage. Based on the results, it was confirmed that the change in physical properties due to the change in environmental temperature is specific to polycarboxylic acid-based superplasticizers. It was also confirmed that centrifugal treatment of the superplasticizer slightly decreased its performance but increased the effect of thermal stimulation.

• Periodical: Key Engineering Materials (Volume 896)
• Pages: 157-163
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.896.157
• Online since: August 2021
• Authors: Mizuki Takigawa, Nana Katsuoka, Shin Ichiro Hashimoto, Shigeyuki Date*
• Keywords: Centrifugal Treatment, Long-Term Storage, Mortar, Polymer, Superplasticizers, Thermal Stimulation

References

[1] Papo, L.Pain:Cem.Concr.Res.34,2097,(2004).

[2] Japan society of civil engineers: 2012 Established Concrete Standard Specification [Construction], (2012).

[3] M. Inaba, K. Maruyama, S. Minaguchi, N. Sakata: Flowability Keeping. Mechanism of Self-Compacting Concrete, Vol.18, No.1, pp.129-134, 1996(Japanese).

[4] T. Sugamata, A. Hibino, M. Ouchi, H. Okamura: Effects of the molecular structure of polycarboxylate polymers on the cement particle dispersibility, Journal of JSCE, V-49, No.662, pp.17-27, 2000(Japanse).

DOI: 10.2208/jscej.2000.662_17

[5] A. Ohta, T. Sugiyama, Y. Tanaka: Fluidizing Mechanism and Application of Polycarboxylate-Based Superplasticizers, 5th CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete, pp.359-378, (1997).

DOI: 10.14359/6193

[6] T. Haga, S. Aoki, N. Miura, R. Chikamatsu: Basic research on ultra-high strength underground continuous wall concrete, The 46th Annual Scientific Lecture Meeting of the Japan Society of Civil Engineers, V, pp.648-649, 1999(Japanese).

[7] A. Ohta, K. Uomoto: Fundamental study on the chemical structures of advanced superplasticizers and their effect on flowability. (1), SEISAN KENKYU, Vol.49, No.12, pp.637-640, 1997(Japanese).

[8] R.J. Flatt, J.Zimmermann, Cc.Hampel, C.Kurz, I.Schober, L.Frunz, C. Plassard, and E. Lesniewska: The role of adsorption energy in the sulfate–polycarboxylate competition, ACI International Conference, Vol.262, pp.153-164, (2009).

[9] Q. Ran, P. Somasundaran, C. Miao, J. Liu, S. Wu, J.and Shen: Effect of the length of the side chains of comb-like copolymer dispersants on dispersion and rheological properties of concentrated cement suspensions, Journal of Colloid and Interface Science 2009; 336: 2624-633, (2009).

DOI: 10.1016/j.jcis.2009.04.057

[10] A. Ohta, K. Uomoto: Dispersing Effect of Polycarboxylate-Based Superplasticizers for Binder Particles, Proceedings of the Japan Concrete Institute, Vol.20, No.2, pp.85-90, 1998(Japanese).

[11] D. Hamada, T. Sato, F. Yomoto, T. Mizunuma: Development of new superplasticizer and its application to self-compacting concrete, Proceedings of the 6th CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete, 211. Ed. V.M. Malhotra, American Concrete Institute; SP-195-17, pp.269-290, (2000).

DOI: 10.14359/9918

[12] K.Yamada, S. Ogawa, and S.Hanehara: Controlling of the adsorption and dispersing force of polycarboxylate-type superplasticizer by sulfate ion concentration in aqueous phase, Cem Concr Res , 31, 3, pp.375-383, (2001).

DOI: 10.1016/s0008-8846(00)00503-2

[13] H.H Bache: Densified cement-based ultrafine particle-based material, Proceedings of the 2th International Conference on Superplasticizer in Concrete, Ottawa; pp.185-213,(1981).

[14] K. Maeda, M. Ouchi: Maintaining fluidity of self-filling mortar in a high-temperature environment, Proceedings of the Japan Concrete Institute, Vol.31, No.1, pp.1465-1470, 2009(Japanese).

[15] M. Takigawa, R. Faraidoon, R. Kit, S. Date: Basic Research of Improving the Mortar Flow by Thermal Stimulation to Superplasticizer, MATEC Web of Conferences, 278, 01003, pp.1-6, (2018).

DOI: 10.1051/matecconf/201927801003

[16] M. Takigawa, K. Sasaki, R. Kita, S. Date: Thermal stimulation effect on superplasticizers on the fresh properties of mortar, Proceedings of the Japan Concrete Institute, Vol.41, No.1, pp.1139-1144, 2019(Japanese).

[17] M. Takigawa, Y. Bomura, S. Hashimoto, S. Date: Effect of Thermal Stimulation on Various Characteristics of Superplasticizer, International Journal of Engineering and Technology, Vol.11, No.4, pp.262-266, (2019).

DOI: 10.7763/ijet.2019.v11.1158

[18] Y. Takashima: Chapter 2 Uranium enrichment, The Journal of the Institute of Electrical Engineers of Japan, Vol.92, No.5, pp.518-522, 1972(Japanese).

[19] Y. Moriya, A. Ohta: The Trend of Air Entraining and High Range Water Reducing Agent, Journal of the Society of Materials Science, Japan, Vol.43, No.491, pp.919-929, 1994(Japanese).

DOI: 10.2472/jsms.43.919