Rheological Properties of Cement Paste with Nano-Fe3O4 under Magnetic Field: Flow Curve and Nanoparticle Agglomeration

Materials - Tập 13 Số 22 - Trang 5164
Dengwu Jiao1,2, Karel Lesage2, Mert Yücel Yardımcı2, Khadija El Cheikh2, Caijun Shi1, Geert De Schutter2
1Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China
2Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium

Tóm tắt

Understanding the influence of magnetic fields on the rheological behavior of flowing cement paste is of great importance to achieve active rheology control during concrete pumping. In this study, the rheological properties of cementitious paste with water-to-cement (w/c) ratio of 0.4 and nano-Fe3O4 content of 3% are first measured under magnetic field. Experimental results show that the shear stress of the cementitious paste under an external magnetic field of 0.5 T is lower than that obtained without magnetic field. After the rheological test, obvious nanoparticle agglomeration and bleeding are observed on the interface between the cementitious paste and the upper rotating plate, and results indicate that this behavior is induced by the high magnetic field strength and high-rate shearing. Subsequently, the hypothesis about the underlying mechanisms of nanoparticles migration in cementitious paste is illustrated. The distribution of the nanoparticles in the cementitious paste between parallel plates is examined by the magnetic properties of the powder as determined by a vibrating sample magnetometer. It is revealed that the magnetization of cementitious powders at different sections and layers provides a solid verification of the hypothesis.

Từ khóa


Tài liệu tham khảo

De Schutter, G. (2017, January 3–8). Thixotropic Effects during Large-scale Concrete Pump Tests on Site. Proceedings of the 71st RILEM Annual Week & ICACMS 2017, Chennai, India.

Roussel, 2006, A thixotropy model for fresh fluid concretes: Theory, validation and applications, Cem. Concr. Res., 36, 1797, 10.1016/j.cemconres.2006.05.025

Meng, 2017, Improving flexural performance of ultra-high-performance concrete by rheology control of suspending mortar, Compos. Part B Eng., 117, 26, 10.1016/j.compositesb.2017.02.019

Marchon, 2018, Hydration and rheology control of concrete for digital fabrication: Potential admixtures and cement chemistry, Cem. Concr. Res., 112, 96, 10.1016/j.cemconres.2018.05.014

Jones, 2018, Rheological Control of 3D Printable Cement Paste and Mortars, Strain-Hardening Cement-Based Composites, Volume 19, 70

De Schutter, G., Lesage, K., El Cheikh, K., De Schryver, R., Ezzat, M., and Chibulu, C. (2017, January 29–31). Casting Concrete Structures in a Smarter Way. Proceedings of the 14th International Conference on Durability of Building Materials and Components, RILEM Proceedings PRO 107, Ghent, Belgium.

Lesage, 2018, Active control of properties of concrete: A (p)review, Mater. Struct., 51, 123, 10.1617/s11527-018-1256-2

Lesage, 2018, Vision of 3D printing with concrete—Technical, economic and environmental potentials, Cem. Concr. Res., 112, 25, 10.1016/j.cemconres.2018.06.001

2002, Rheological properties of magnetorheological fluids, Smart Mater. Struct., 11, 140, 10.1088/0964-1726/11/1/316

Bica, 2013, Physical characteristics of magnetorheological suspensions and their applications, J. Ind. Eng. Chem., 19, 394, 10.1016/j.jiec.2012.10.008

Ahamed, 2018, A state of art on magneto-rheological materials and their potential applications, J. Intell. Mater. Syst. Struct., 29, 2051, 10.1177/1045389X18754350

Nair, 2014, Set-on-demand concrete, Cem. Concr. Res., 57, 13, 10.1016/j.cemconres.2013.12.001

Nair, 2016, Real time control of fresh cement paste stiffening: Smart cement-based materials via a magnetorheological approach, Rheol. Acta, 55, 571, 10.1007/s00397-016-0923-x

Jiao, 2019, Structural build-up of cementitious paste with nano-Fe3O4 under time-varying magnetic fields, Cem. Concr. Res., 124, 105857, 10.1016/j.cemconres.2019.105857

Jiao, D., El Cheikh, K., Lesage, K., Shi, C., and De Schutter, G. (2019). Structural Build-Up of Cementitious Paste Under External Magnetic Fields. Strain-Hardening Cem.-Based Comp., 36–42.

Jiao, 2017, Effect of constituents on rheological properties of fresh concrete-A review, Cem. Concr. Compos., 83, 146, 10.1016/j.cemconcomp.2017.07.016

Wallevik, 2011, Rheology as a tool in concrete science: The use of rheographs and workability boxes, Cem. Concr. Res., 41, 1279, 10.1016/j.cemconres.2011.01.009

Wallevik, O.H. (2003, January 17–20). Rheology—A Scientific Approach to Develop Self-Compacting Concrete. Proceedings of the 3rd International Symposium on Self-Compacting Concrete, Reykjavik, Iceland.

Roussel, 2007, Rheology of fresh concrete: From measurements to predictions of casting processes, Mater. Struct., 40, 1001, 10.1617/s11527-007-9313-2

Roussel, 2007, SCC casting prediction for the realization of prototype VHPC-precambered composite beams, Mater. Struct., 40, 877, 10.1617/s11527-006-9190-0

Yuan, 2019, A feasible method for measuring the buildability of fresh 3D printing mortar, Constr. Build. Mater., 227, 116600, 10.1016/j.conbuildmat.2019.07.326

Moeini, 2020, Effectiveness of the rheometric methods to evaluate the build-up of cementitious mortars used for 3D printing, Constr. Build. Mater., 257, 119551, 10.1016/j.conbuildmat.2020.119551

Park, 2001, Rheological Properties and Stabilization of Magnetorheological Fluids in a Water-in-Oil Emulsion, J. Colloid Interface Sci., 240, 349, 10.1006/jcis.2001.7622

Fang, 2009, Synthesis of core–shell structured PS/Fe3O4 microbeads and their magnetorheology, Polymers, 50, 2290, 10.1016/j.polymer.2009.03.023

Chin, 2001, Rheological properties and dispersion stability of magnetorheological (MR) suspensions, Rheol. Acta, 40, 211, 10.1007/s003970000150

Laun, 2010, Twin gap magnetorheometer using ferromagnetic steel plates—Performance and validation, J. Rheol., 54, 327, 10.1122/1.3302804

Rankin, 1999, Magnetorheology in viscoplastic media, Rheol. Acta, 38, 471, 10.1007/s003970050198

Lee, 2019, Magnetorheological characteristics of carbonyl iron microparticles with different shapes, Korea-Aust. Rheol. J., 31, 41, 10.1007/s13367-019-0005-6

Beruto, 2014, Kinetic model of Chlorella vulgaris growth with and without extremely low frequency-electromagnetic fields (EM-ELF), J. Biotechnol., 169, 9, 10.1016/j.jbiotec.2013.10.035

Beruto, 2008, Aluminum hydroxide microstructural units in gelled media aged, or nonaged, with alcohol and water, J. Colloid Interface Sci., 322, 158, 10.1016/j.jcis.2008.02.025

Leighton, 1987, The shear-induced migration of particles in concentrated suspensions, J. Fluid Mech., 181, 415, 10.1017/S0022112087002155

Krishnan, 1996, Shear-induced radial segregation in bidisperse suspensions, J. Fluid Mech., 321, 371, 10.1017/S0022112096007768

Chapman, B.K. (1991). Shear-Induced Migration Phenomena in Concentrated Suspensions. [Doctoral Dissertation, University of Notre Dame].

Chow, 1994, Shear-induced particle migration in Couette and parallel-plate viscometers: NMR imaging and stress measurements, Phys. Fluids, 6, 2561, 10.1063/1.868147

Jiao, D., Lesage, K., Yardimci, M.Y., El Cheikh, K., Shi, C., and De Schutter, G. (2020). Quantitative assessment of the influence of external magnetic field on clustering of nano-Fe3O4 particles in cementitious paste. Cem. Concr. Res., under review.

Sagues, 2009, Bulk magnetic susceptibility measurements for determination of fly ash presence in concrete, Cem. Concr. Res., 39, 95, 10.1016/j.cemconres.2008.11.004

Thông tin
Thông tin xuất bản

Materials

Tập 13 Số 22

5164

Thông tin tác giả