Mix Design Selection For Old and New Generation of SuprePlasticizers

Subject Areas : Structural Engineering

Navid  Afshari ¹ (2Master of Science in Construction Management, Department of civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran)
Seiyed Ali  Haj Seiyed Taghia ² (Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran)

Received: 2019-02-03 Accepted : 2019-03-10 Published : 2020-06-01

Keywords: Compressive Strength, Mix design, Polycarboxylate Ether, Naphthalene Sulphonate,

Abstract :

Determination the optimal mix design plays an important role in order to gain the maximum characteristic strength. This research was conducted as a case study for Manjil tunnel project located in Qazvin-Rasht highway. For this purpose, 18 concrete mix designs were prepared at the study phase of the project with specifications such as conventional water-to-cement ratios of 0.4, 0.5 and 0.6, the use of two generations of new and old conventional superplasticizer in Iran (naphthalene sulphonate and polycarboxylate ether types, respectively) with cement weight percentages of 0.2, 0.4 and 0.6. Superplasticizers are used to increase the fluidity of concrete without adding excess water. The naphthalene sulphonate is a polymeric molecule formed by condensation of naphthalene sulfonic acid and formaldehyde, in which the hydrophilic groups are mainly sulfonic groups. It has been demonstrated that polycarboxylate ether can mitigate plastic shrinkage of matrix because of the reduction of the build-up rate of capillary pressure by polycarboxylate ether. Finally, the optimal water-to-cement ratio and superplasticizer weight percentage were determined. Concrete mix designs with different ages of curing were made (0, 3, 7, 14 and 28 days).

References:

Yamada, K., Takahashi, T., Hanehara, S., Matsuhisa, M., “Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer”, Cem. Concr. Res, 30(2000), 197–207.

[2] Kreppelt, F., Weibel, M., Zampini, D., Romer, M., “Influence of solution chemistry on the hydration of polished clinker surfaces—a study of different types of polycarboxylic acid-based admixtures”, Cem. Concr. Res, 32 (2002), 187–198.

[3] Carazeanu, I., Chirila, E., Georgescu, M., “Investigation of the hydration process in3CaO–Al2O3–CaSO4–2H2O–plasticizer–H2O systems by X-ray diffraction”, Talanta, 57 (2002), 617–623.

[4] Yu, Y., Liu, J., Ran, Q., Qiao, M., Zhou, D., “Current understanding of comb-like copolymer dispersants impact on the hydration characteristics of C3A– gypsum suspension”, J. Therm. Anal. Calorim, 111 (2013), 437–444.

[5] Chen, S., Ting-shu, H., Zhang, G., Wang, X., Yanyan, H., “Effects of superplasticizers on carbonation resistance of concrete. Construction and Building Materials”, 108 (2016), 48–55.

[6] Toledano-Prados, M., Lorenzo-Pesqueira, M., González-Fonteboa, B., Seara-Paz, S., “Effect of polycarboxylate superplasticizers on large amounts of fly ash cements”, Constr. Build. Mater, 48 (2013), 628–635.

[7] Gołaszewski, J., Szwabowski, J., “Influence of superplasticizers on rheological behaviour of fresh cement mortars”, Cem. Concr. Res, 34 (2), 235–248, 2004.

[8] Ferrari, L., Kaufmann, J., Winnefeld, F., Plank, J., “Interaction of cement model systems with superplasticizers investigated by atomic force microscopy, zeta potential, and adsorption measurements”, J. Colloid Interface Sci, 347 (1), 15–24, 2010.

[9] Puertas, F., Santos, H., Palacios, M., Martínez-Ramírez, S., “Polycarboxylate superplasticiser admixtures: effect on hydration, microstructure and rheological behaviour in cement pastes”, Adv. Cem. Res, 17 (2), 77–89, 2005.

[10] Palacios, M., Puertas, F., Bowen, P., Houst, Y.F., “Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes”, J. Mater. Sci, 44 (10), 2714–2723, 2009.

[11] Mollah,  M.Y.A., Adams, W.J., Schennach, R., Cocke, D.L., “A review of cement– superplasticizer interactions and their models”, Adv. Cem. Res, 12 (4), 153–161, 2000.

[12] Yamada, K., T Takahashi, S., Matsuhisa, M., “Effects of the chemical structure on the properties of polycarboxylate-type superplasticizer”, Cem. Concr. Res’ 30 (2), 197–207, 2000.

[13] Adjoudj, M.H., Ezziane, K., Kadri, E.H., Ngo, T.T., Kaci, A., “Evaluation of rheological parameters of mortar containing various amounts of mineral addition with polycarboxylate superplasticizer”, Constr. Build. Mater, 70 (2014), 549–559.

[14] Lange, A., Hirata, T., Plank, J., “Influence of the HLB value of polycarboxylate superplasticizers on the flow behavior of mortar and concrete”, Cem. Concr. Res, 60 (2014), 45–50.

[15] Li, Y., Yang, C., Zhang, Y., Zheng, J., Guo, H., Lu, M., “Study on dispersion, adsorption and flow retaining behaviors of cement mortars with TPEG-type polyether kind polycarboxylate superplasticizers”, Constr. Build. Mater, 64 (2014), 324– 332.

[16] Cartuxo, F., de Brito, J., Evangelista, L., Jiménez, J.R., Ledesma, E.F., “Rheological behaviour of concrete made with fine recycled concrete aggregates – influence of the superplasticizer”, Constr. Build. Mater, 89 (2015), 36–47.

[17]  ASTM C150, “Standard specification for portland cement”, American Society For Testing And Materials, November 1999.

[18]  ASTM C33, “Standard Specification for Concrete Aggregates”.

[19]  ASTM C39, “Standard Test Method for Compressive Strength of Cylindrical Concrete, Specimens”.