Abstract
Time and water‐to‐cement ratio have significant influences on rheology of cement grouts. In order to study effects of time and water‐to‐cement ratio on rheology of Bingham cement grouts, taking Bingham cement grouts widely used in practical engineering (cement grouts with water‐to‐cement ratio of 0.75–1.25) as research object, some rheological experiments of five cement grouts with water‐to‐cement ratio of 0.8, 0.9, 1.0, 1.1, and 1.25 were carried out at six moments of 0, 5, 10, 20, 30, and 60 minutes, respectively. Combining theoretical discussion with numerical analysis, influence of coupling effects of time and water‐to‐cement ratio on rheological properties of Bingham cement grouts was discussed. Results show that at the level of α = 0.05, time has a significant influence on plastic viscosity but has no significant influence on the yield stress of Bingham cement grouts. Water‐to‐cement ratio has a significant influence on both plastic viscosity and yield stress. Exponential models obtained by comprehensive analysis from statistical theory, practical applicability, and accuracy are the optimal models to describe quantitative change in the relationship of coupling effects of time and water‐to‐cement ratio on plastic viscosity and yield stress of Bingham cement grouts. The rheological equation considering coupling effects of time and water‐to‐cement ratio of Bingham cement grouts is constructed. Research achievements not only have certain theoretical significance to the development and improvement of fluid mechanics and theoretical system of penetration grouting but also provide theoretical support and technical reference for practical grouting engineering and also have certain practical significance for solving or improving the practical engineering problems.
Highlights
Engineering practice shows that cement, an inorganic cementitious material with low cost and good performance, is widely used in many engineering fields, such as roads, tunnels, slopes, foundations, railways, buildings, mines, and water conservancy. e rheology of cement grouts has a significant influence on its migration and diffusion and the engineering effects on rock and soil. erefore, the study of the rheology of cement grouts can provide a theoretical basis for the study of its migration and diffusion mechanism and provide technical support for practical engineering design [1,2,3].e rheology of cement grouts is influenced by its composition, water-to-cement ratio, temperature, and time.e rheology under these factors has been studied deeply
Where τ is the shear stress, Pa; τ0 is the yield stress, Pa; np is the plastic viscosity, Pa·s; c is the shear speed, s−1; and yield stress and plastic viscosity are usually used to characterise the rheological properties of Bingham fluid
Taking Bingham cement grouts, which are widely used in practical engineering, as the object of study, the coupling effects of time and water-to-cement ratio on the rheological properties of Bingham cement grouts at room temperature (25 ± 2°C) were investigated by combining experimental research, theoretical discussion, and numerical analysis, and the following conclusions are obtained: (1) At the level of α 0.05, time has a significant influence on plastic viscosity but has no significant influence on the yield stress of Bingham cement grouts
Summary
Engineering practice shows that cement, an inorganic cementitious material with low cost and good performance, is widely used in many engineering fields, such as roads, tunnels, slopes, foundations, railways, buildings, mines, and water conservancy. e rheology of cement grouts has a significant influence on its migration and diffusion and the engineering effects on rock and soil. erefore, the study of the rheology of cement grouts can provide a theoretical basis for the study of its migration and diffusion mechanism and provide technical support for practical engineering design [1,2,3].e rheology of cement grouts is influenced by its composition, water-to-cement ratio, temperature, and time.e rheology under these factors has been studied deeply. E rheology of cement grouts has a significant influence on its migration and diffusion and the engineering effects on rock and soil. E rheology of cement grouts is influenced by its composition, water-to-cement ratio, temperature, and time. Ruan et al [4,5,6,7,8,9] studied the change of cement grouts rheology with time. Costas considered the effect of different superplasticizer on the rheological properties of cement grouts [18]. Yang et al [20,21,22,23,24,25] studied the effect of water-tocement ratio on the rheology of cement grouts. Liu et al [21, 26,27,28,29,30,31] considered the characteristics of temperature change on the fluidity of cement grouts
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