Hydration-time-dependent rheological behaviors of Newtonian cement grouts with different water cement ratios

被引：0
|
作者：
Yang Z. [1 ]
Ding Y. [1 ]
Yang Y. [1 ]
Zhu Y. [1 ,2 ]
Zhang J. [3 ]
Guo Y. [4 ]
Chen X. [5 ]
机构：
[1] Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming
[2] Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu
[3] Yunnan Institute of Geological Environment Monitoring, Kunming
[4] Kunming Survey, Design and Research Institute Co., Ltd. of CREEC, Kunming
[5] The Third Engineering Co., Ltd. of China Railway Seventh Bureau Group Corporation, Xi'an
来源：
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2020年 / 36卷 / 19期
关键词：
Cement grouts; Experiments; Hydration time; Rheological properties; Water cement ratio;
D O I：
10.11975/j.issn.1002-6819.2020.19.018
中图分类号：
学科分类号：
摘要：
As an inorganic cementitious material with low cost and good property, cement grouts has been widely used in many engineering fields such as highways, tunnel, slopes, foundations, railways, construction, mining and water conservancy. As for cement grouts, the rheological properties of cement grouts are significantly affected by the changes of the hydration time and the water cement ratio, which determine the diffusion state of cement grouts in rocks and soils and have a great influence on the outcome of projects. However, the current research only considered the influence of a single factor on rheological properties of cement grouts, the combined effect of these factors has not been well understood. In this study, Portland cement grouts, a widely used material in practical grouting engineering are used as the research object and the Portland cement grouts with four water cement ratios which are the typical cement ratio of Newtonian fluid (1.5, 2.0, 5.0, 10.0) at six moments (0, 5, 10, 20, 30 and 60 min) were chosen as the experimental group, then combined with the numerical analysis and the theoretical method the effect of hydration time and water cement ratio on rheological properties of Newtonian cement grouts was studied. The results show that: the hydration time and the water cement ratio both have significant influence on dynamic viscosity of Newtonian cement. The former shows a trend of growth, and the longer the hydration time is, the faster the growth trend, the latter shows a trend of decreased, and the smaller the water cement ratio is, the more significant the decreasing trend. Combined with the perspective of statistical theory, practical applicability and accuracy, this study selects four theoretical models to discuss the quantitative relationship of the effect of hydration time and water cement ratio on rheological properties of Newtonian cement grouts, and the four theoretical models are the most basic in mathematics, also the most widely used in practice: the linear model, exponential model, power function model and logarithm model. Then the optimal model will be determined from the fourth according to statistical theory and experimental verification. Comparing the determination coefficients and the regression values of the four fitting models, the exponential model is the optimal model for the quantitative change of dynamic viscosity of Newtonian cement to react the effect of hydration time and water cement ratio on rheological properties of Newtonian cement grouts. The difference between the theoretical value and the experimental value of the exponential model is within 10%, while more than 80% of the difference between the theoretical value and the experimental value of linear, logarithmic and power function models are greater than 10%. Thus, the rheological equation of Newtonian cement considering the hydration time and the water cement ratio are built. The research results can not only improve the rheological theory of Newtonian cement grouts, but also provide certain technical support for practical engineering applications such as the building foundation support, tunnel water plugging and seepage prevention, foundation reinforcement, geological disaster prevention and control, and agricultural soil conservation. © 2020, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.
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页码：161 / 167
页数：6
相关论文
共 31 条
  • [1] (2000)
  • [2] Axelsson M, Gustafson G., A robust method to determine the shear strength of cement-based injection grouts in the field, Tunnelling and Underground Space Technology, 36, 5, pp. 499-503, (2006)
  • [3] Yang Yi, Lu Jie, Yang Zhiquan, Et al., Experiments and effect parameters prediction model of reinforcement loose gravel soil-layers by flower pipe grouting, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 34, 24, pp. 151-157, (2018)
  • [4] Liu Quansheng, Lu Chaobo, Liu Bing, Et al., Study on rheological properties of cement slurry considering the effects of temperature and hydration time, Chinese Journal of Rock Mechanics and Engineering, 33, S2, pp. 3730-3740, (2014)
  • [5] Ruan Wenjun, Research on diffusion of grouting and basic properties of grouts, Chinese Journal of Geotechnical Engineering, 27, 1, pp. 69-73, (2005)
  • [6] Yuan Jingqiang, Chen Weizhong, Yu Jianxin, Et al., Study on time-varying characteristics and microstructure of slurry viscosity under still water condition, Chinese Journal of Underground Space and Engineering, 12, 5, pp. 1264-1270, (2016)
  • [7] Li Sucai, Han Weiwei, Zhang Qinsong, Et al., Study on time-varying viscosity of dynamic water grouting slurry in underground engineering, Chinese Journal of Geotechnical Engineering, 32, 1, pp. 1-7, (2013)
  • [8] Roussel N, Roy R L, Coussot P., Thixotropy modelling at local and macroscopic scales, Non-Newtonian Fluid Mech, 117, 2, pp. 85-95, (2004)
  • [9] Yang Z Q, Qian S G, Hou K P., Time-dependent Behavior Characteristics of Power-law Cement Grouts Applied in geotechnical Engineering, ElectronicJournal of Geotechnical Engineering, 20, 22, pp. 1017-1023, (2015)
  • [10] Mirza J, Mirza M S, Roy V, Et al., Basic rheological and mechanical properties of high-volume fly ash grouts, Constr Build Mater, 16, 6, pp. 353-363, (2002)
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