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Optimization of Superplasticizer Dosage for Cementitious Suspension Involved in High Shear Applications


Affiliations
1 Construction Technology and Management, Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, India
 

The dosage of superplasticizer (SP) plays a vital role in influencing the behaviour of fresh concrete through cementitious paste. For optimizing the SP dosage, generally empirical tests like mini-slump and Marsh cone are adopted. However, they do not capture the requirement of suitable SP dosage for processes involving high shear energy like pumping. Recent studies have shown that SP, especially polycarboxylate ether/esters (PCE)-based, influences the shear thickening behaviour of cement-based pastes. The addition of PCE at higher dosage, decreases the apparent viscosity by de-flocculation of cement paste. However, at increased shear forces, the reaggregation results in early onset of shear thickening and also increases its intensity, thus affecting the pumping process. On the other hand, the commercially available, site-specific PCE and the prescriptive SP dosages complicate the problem. The above problem necessitates the need to understand the mechanism behind the action of PCE on shear thickening of cement pastes experiencing high shear energy process. In this regard, it is rational to optimize the SP dosage based on shear rates (corresponding to applications) through rheological studies rather than empirical tests.

Keywords

Cementitious Suspension, High Shear Energy, Rheological Studies, Shear Thickening, Superplasticizer Optimization.
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  • ACI-Committee 304, Placing concrete by pumping methods. American Concrete Institute, 1998.

  • Crepas, R., Pumping Concrete, Techniques and Applications, Crepas and Associates, Inc., Elmhurst, USA, 3rd edn, 1997.

  • Eckardstein, K. V., Pumping, Concrete and Concrete Pumps – A Concrete Placing Manual. Schwing, 1983.

  • Feys, D., Verhoeven, R. and De Schutter, G., Fresh self compacting concrete, a shear thickening material. Cem. Concr. Res., 2008, 38, 920–929.

  • Feys, D., Interactions between rheological properties and pumping of self-compacting concrete. Ph D thesis, Department of Civil Engineering, Ghent University, Belgium, 2009.

  • Feys, D., Schutter, G. De and Verhoeven, R., Parameters influencing pressure during pumping of self-compacting concrete. Mater. Struct., 2013, 46, 533–555.

  • Roussel, N., From industrial testing to rheological parameters for concrete. In Understanding the Rheology of Concrete (ed. Roussel, N.), Woodhead Publishing Series in Civil and Structural Engineering. Woodhead Publishing, Cambridge, UK, 2012, 1st edn, pp. 83–95.

  • Agulló, L., Gettu, R. and Aguado, A., Fluidity of cement pastes with mineral admixtures and superplasticizers – a study based on Marsh cone test. Mater. Struct. 1999, 32, 479–485.

  • Aitcin, P. C. and Baalbaki, M., Concrete admixtures – key components of modern concrete. In Concrete Technology: New Trends, Industrial Applications. E&FN Spon, London, UK, 1994, pp. 33–47.

  • Giaccio, G. and Zerbino, R., Optimum superplasticizer dosage for systems with different cementitious materials. Indian Concr. J., 2002, 76, 553–557.

  • Roussel, N. and Le Roy, R., The Marsh cone: a test or a rheological apparatus? Cem. Concr. Res., 2005, 35, 823–830.

  • de Larrard, F., A method for proportioning high strength concrete mixtures. Cem. Concr. Aggr., 1990, 12, 47–52.

  • ASTM C939/C939M – 16a. Standard test method for flow of grout for preplaced – aggregate concrete (flow cone method), Pennsylvania, USA, 2016.

  • ASTM C109/C109M – 11b. Standard test method for compressive strength of hydraulic cement mortars (using 2-in. or (50-Mm) cube specimens), Pennsylvania, USA, 2010.

  • Gomes, P. C. C., Gettu, R., Agullo, L. and Bernard, C., Experimental optimization of high strength self-compacting concrete. In Proceedings of Second International Symposium on SCC (eds Ozawa, K. and Ouchi, M.), Kochi, Japan, 2001, pp. 377–386.

  • Aïtcin, P.-C., High Performance Concrete, E&FN Spon, London, UK, 1st edn, 1998.

  • Sonebi, M., Lachemi, M. and Hossain, K. M. A., Optimization of rheological parameters and mechanical properties of superplasticized cement grouts containing metakaolin and viscosity modifying admixtures. Constr. Build Mater., 2013, 38, 126–138.

  • Nanthagopalan, P. and Santhanam, M., A new approach to optimisation of paste composition in self-compacting concrete. Indian Concr. J., 2008, 82, 11–18.

  • Ferraris, C. F., Obla, K. H. and Hill, R., The influence of mineral admixtures on the rheology of cement paste and concrete. Cem. Concr. Res., 2001, 31, 245–255.

  • Nkinamubanzi, P.-C. and Aïtcin, P.-C., Cement and superplasticizer combinations: compatibility and robustness. Cem. Concr. Aggr., 2004, 26, 1–8.

  • Reed, J. S., Principles of Ceramic Processing, John Wiley, New York, USA, 1995, 2nd edn.

  • Saak, A. W., Jennings, H. M. and Shah, S. P., New methodology for designing self-compacting concrete. ACI Mater. J., 2001, 98, 429–439.

  • Hot, J., Bessaies-Bey, H., Brumaud, C., Duc, M., Castella, C. and Roussel, N., Adsorbing polymers and viscosity of cement pastes. Cem. Concr. Res., 2014, 63, 12–19.

  • Fernandez, N. et al., Microscopic mechanism for the shearthickening of non-Brownian suspensions. Phys. Rev. Lett., 2013, 111, 108301–108305.

  • Gelardi, G. and Flatt, R. J., Working mechanisms of water reducers and superplasticizers. In Science and Technology of Concrete Admixtures (eds Aïtcin, P.-C. and Flatt, R. J.), Elsevier, Cambridge, UK, 2016, 1st edn, pp. 257–278.

  • Yang, M., Neubauer, C. M. and Jennings, H. M., Interparticle potential and sedimentation behavior of cement suspensions: review and results from paste. Adv. Cem. Based Mater., 1997, 5, 1–7.

  • Pellenq, R. J.-M., Caillol, J. M. and Delville, A., Electrostatic attraction between two charged surfaces: a (N, V, T) Monte Carlo simulation. J. Phys. Chem. B, 1997, 101, 8584–8594.

  • Lesko, S., Lesniewska, E., Nonat, A., Mutin, J. C. and Goudonnet, J. P., Investigation by atomic force microscopy of forces at the origin of cement cohesion. Ultramicroscopy, 2001, 86, 11–21.

  • Brown, E. and Jaeger, H. M., Shear thickening in concentrated suspensions: phenomenology, mechanisms and relations to jamming. Rep. Prog. Phys., 2014, 77, 1–23.

  • Wagner, N. J. and Brady, J. F., Shear thickening in colloidal dispersions. Phys. Today, 2009, 62, 27–32.

  • Fernandez, N., From tribology to rheology: impact of interparticle friction in the shear thickening of non-Brownian suspensions. Ph D thesis, Department of Materials Science, ETH Zurich, Switzerland, 2014, pp. 22–35.

  • Roussel, N., A thixotropy model for fresh fluid concretes: theory, validation and applications. Cem. Concr. Res., 2006, 36, 1797– 1806.

  • Yahia, A., Shear-thickening behavior of high-performance cement grouts – influencing mix-design parameters. Cem. Concr. Res., 2011, 41, 230–235.

  • Chougnet, A., Audibert, A. and Moan, M., Linear and non-linear rheological behaviour of cement and silica suspensions. Effect of polymer addition. Rheol. Acta, 2007, 46, 793–802.

  • Yahia, A., Effect of solid concentration and shear rate on shearthickening response of high-performance cement suspensions. Constr. Build Mater., 2014, 53, 517–521.

  • Kantro, D. L., Influence of water-reducing admixtures on properties of cement paste – a miniature slump test. Cem. Concr. Aggr., 1980, 2, 95–102.

  • Nanthagopalan, P., Haist, M., Santhanam, M. and Müller, H. S., Investigation on the influence of granular packing on the flow properties of cementitious suspensions. Cem. Concr. Compos., 2008, 30, 763–768.

  • Tregger, N., Ferrara, L. and Shah, S. P., Identifying viscosity of cement paste from mini-slump-flow test. ACI Mater J., 2008, 105, 558–566.

  • BIS, IS 269: 2015, Ordinary Portland cement – specification, Bureau of Indian Standards, New Delhi, 2015.


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  • Optimization of Superplasticizer Dosage for Cementitious Suspension Involved in High Shear Applications

Abstract Views: 424  |  PDF Views: 140

Authors

P. V. P. Moorthi
Construction Technology and Management, Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, India
Prakash Nanthagopalan
Construction Technology and Management, Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, India

Abstract


The dosage of superplasticizer (SP) plays a vital role in influencing the behaviour of fresh concrete through cementitious paste. For optimizing the SP dosage, generally empirical tests like mini-slump and Marsh cone are adopted. However, they do not capture the requirement of suitable SP dosage for processes involving high shear energy like pumping. Recent studies have shown that SP, especially polycarboxylate ether/esters (PCE)-based, influences the shear thickening behaviour of cement-based pastes. The addition of PCE at higher dosage, decreases the apparent viscosity by de-flocculation of cement paste. However, at increased shear forces, the reaggregation results in early onset of shear thickening and also increases its intensity, thus affecting the pumping process. On the other hand, the commercially available, site-specific PCE and the prescriptive SP dosages complicate the problem. The above problem necessitates the need to understand the mechanism behind the action of PCE on shear thickening of cement pastes experiencing high shear energy process. In this regard, it is rational to optimize the SP dosage based on shear rates (corresponding to applications) through rheological studies rather than empirical tests.

Keywords


Cementitious Suspension, High Shear Energy, Rheological Studies, Shear Thickening, Superplasticizer Optimization.

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DOI: https://doi.org/10.18520/cs%2Fv118%2Fi11%2F1672-1678