Static Yield Stress of Cement-based Grouting Material under Different Rheological Modes

Abstract

To quantitatively estimate the workability of cement-based grouting material, from the perspective of rheology, the result of the static yield stress evaluated using the rate-controlled and stress-controlled modes, respectively, was compared using the Rheowin rheometer. Also, the correlation of workability and solid concentration of slurry with static yield stress was studied. Results show that the static yield stress of cement-based grouting slurry relates to the established slurry structure, and is the shear stress corresponding to the transformation of elastics to plastics; In rate-controlled mode, the static yield stress of the slurry is related to the shear rate. The higher the shear rate, the greater the yield stress of the slurry. For the stress-controlled mode, the result is more accurate and suitable for testing static yield stress under different water-cement ratios. Since the water-cement ratio has a good correspondence with the static yield stress and the static yield stress has a good correspondence with the slump flow of the slurry, the static yield stress is the minimum stress to be overcome when the slurry begins to flow and it reflects the yield behavior and structural stability of the cement.

Keywords

shear mode / stress-controlled mode / static yield stress / solid concentration

References

[1] Sumra Yousuf P, Shafigh Z, et al. The pH of Cement-based Materials: A Review[J]. Journal of Wuhan University of Technology. -Mater. Sci. Ed., 2020, 35(05): 908-924.

[2] Zhang Y, Li W, Li D. Preparation and Performance Research of Cement-based Grouting Materials with High Early Strength and Expansion[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2017, 32(5): 1 115-1 118.

[3] Roussel N, Ovarlez G, Garrault S, et al. The Origins of Thixotropy of Fresh Cement Pastes[J]. Cement and Concrete Research, 2012, 42(1): 148-157.

[4] Qian Y, Kawashima S. Use of Creep Recovery Protocol to Measure Static Yield Stress and Structural Rebuilding of Fresh Cement Pastes[J]. Cement & Concrete Research, 2016, 90: 73-79.

[5] Xiao J, Wang D, Zuo S, et al. Action Mechanism of Ground Limestone in Structural Build up of Cement Paste[J]. Journal of Building Materials, 2018, 21(5): 707-713.

[6] Mahaut F, Chateau X, Coussot P, et al. Yield Stress and Elastic Modulus of Suspensions of Noncolloidal Particles in Yield Stress Fluids[J]. Journal of Rheology, 2008, 52(1): 287-313.

[7] Koehler E P, Fowler D W. Development and Use of a Portable Rheometer for Concrete[C]. Supplementary Proceedings of the Eighth CANMET/ACI International Conference on Recent Advances in Concrete Technology, Montreal, Canada, 2006

[8] Lowke D, Kränkel T, Gehlen C, et al. Effect of Cement on Superplasticizer Adsorption, Yield Stress, Thixotropy and Segregation Resistance[M]. Design, Production and Placement of Self-consolidating Concrete, 2010 Springer: Dordrecht.

[9] Yuan Q, Zhou D, Khayat K H, et al. On the Measurement of Evolution of Structural Build-up of Cement Paste with Time by Static Yield Stress Test vs. Small Amplitude Oscillatory Shear Test[J]. Cement and Concrete Research, 2017, 99: 183-189.

[10] Mahaut F, Mokeddem S, Chateau X, et al. Effect of Coarse Particle Volume Fraction on the Yield Stress and Thixotropy of Cementitious Materials[J]. Cement and Concrete Research, 2008, 38(11): 1 276-1 285.

[11] Perrot A, Lecompte T, Khelifi H, et al. Yield Stress and Bleeding of Fresh Cement Pastes[J]. Cement and Concrete Research, 2012, 42(7): 937-944.

[12] Jiao D, An X, Shi C, et al. Effects of Paste Thickness on Coated Aggregates on Rheological Properties of Concrete[J]. Journal of the Chinese Ceramic Society, 2017, 45(9): 1 360-1 366.

[13] Xiao J, Wang D, Zuo S, et al. Shear Protocols of Cement Paste Based on Steady-State Rheological Test[J]. Journal of the Chinese Ceramic Society, 2017, 36(7): 2 387-2 391.

[14] Xiao J, Wang D, Zuo S, et al. Influence of Temperature on Structure of Fresh Cement Paste with Low Shear Rate[J]. Journal of Building Materials, 2017(6): 835–839

[15] Li Z, Wang D. Static Yield Stress and Viscoelasticity of Fresh Cement Paste Measured by Rotational Viscometer[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(6): 1 818-1 822.

[16] Li F. Research on the Development of Restraint Stress and Stress Relaxation of Concrete at Early Ages[D], 2009 Beijing: Tsinghua University.

[17] Wallevik O H, Feys D, Wallevik J E, et al. Avoiding Inaccurate Interpretations of Rheological Measurements for Cement-based Materials[J]. Cement and Concrete Research, 2015, 78: 100-109.

[18] Roussel N, Lemaître A, Flatt R J, et al. Steady State Flow of Cement Suspensions: A Micromechanical State of the Art[J]. Cement and Concrete Research, 2010, 40(1): 77-84.

[19] Rosquoët F, Alexis A, Khelidj A, et al. Experimental Study of Cement Grout: Rheological Behavior and Sedimentation[J]. Cement and Concrete Research, 2003, 33(5): 713-722.

[20] Nguyen V H, Remond S, Gallias J L. Influence of Cement Grouts Composition on the Rheological Behaviour[J]. Cement and Concrete Research, 2011, 41(3): 292-300.