Journal of Northeastern University(Natural Science) ›› 2025, Vol. 46 ›› Issue (12): 104-115.DOI: 10.12068/j.issn.1005-3026.2025.20240114

• Resources & Civil Engineering • Previous Articles    

Rheological Properties and Diffusion Mechanism of Cement-Based Slurries with Different Water-Cement Ratios

Lian-chong LI, Yi-teng WANG, Wen-qiang MU, Hong-lei LIU   

  1. School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China.
  • Received:2024-05-15 Online:2025-12-15 Published:2026-02-09
  • Contact: Wen-qiang MU

Abstract:

In order to study the diffusion mechanism of grouting materials in geotechnical and mining engineering, the rheological properties of three types of cement-based slurries under five water-cement ratios were analyzed. Based on the time-dependent viscosity of the slurry and the characteristics of fractured rock masses, a theoretical calculation model for grouting slurry diffusion was established to elucidate the diffusion mechanisms of different cement-based slurries. The results indicate that the slurry of the nano-silica sol composite system has a relatively low density(1.25~1.35 g/cm3)and high fluidity (260~425 mm). The slag-fly ash and graphene oxide composite systems exhibit low bleeding rates(< 30%)and good stability. The viscosity of the slurry demonstrates time-dependent characteristics, with a fitting function(η(t)=η0+kaekbt). Time-dependent characteristics weakens as the water-cement ratio increases. The diffusion radii of the three slurries are obtained through computational procedures, revealing that grouting pressure, slurry type, and water-cement ratio collectively influence the diffusion. Under the same diffusion distance, grouting pressure is positively correlated with the time-dependent viscosity characteristics. The graphene oxide composite system requires the least grouting pressure at a given distance, making it easier to diffuse.

Key words: fractured rock mass, grouting slurry, water-cement ratio, rheological property, diffusion radius

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