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Water-blocking nano-composite cement-based grouting materials

  • Sheng WangEmail author
  • Ruhua Gong
  • Zhijun Li
  • Chaopeng Yuan
  • Gui Jiang
  • Jingfei Wang
  • Liyi Chen
  • Changwen Ye
Original Article

Abstract

With the rapid development of underground engineering construction such as hydropower projects, mines, tunnels, etc., underground hydrodynamic-related problems have become a more prominent challenge. In view of the shortcomings of the current hydrodynamic grouting materials, a systematic analysis for the preparation, performance, and water-blocking reinforcement mechanism of a new nano-composite cement-based dynamic water grouting material was carried out by a comprehensive approach of theoretical analysis, laboratory test, field test, and microscopic study. Utilizing the “synergistic hydration” effect produced by compounding ordinary Portland cement and sulfoaluminate cement, aimed at the harmonization of rheological and solidification characteristics of grouting material, a new nano-composite cement-based grouting material (NCC) was developed by mixing with water-reducing agent (JC), early strength agent (VT), nano-materials (SiO2), and cellulose (QC). The properties of the NCC, such as rheology, fluidity, pumpability, setting time, compressive strength, and anti-scour performance were carefully examined by laboratory tests. The NCC product was successfully field tested. Finally, an integrated analysis of X-ray diffraction and scanning electron microscopy was used to investigate the mechanism of water-blocking reinforcement, and consequently, it led to a water-blocking reinforcement process model of nano-composite cement slurry. The research result, i.e., NCC product, provided a new solution to effectively resolve the problem of gushing water disaster in the management of underground engineering construction.

Keywords

Nano-composite cement slurry Dynamic water grouting material Fast hardening and early strength Water-blocking reinforcement mechanism X-ray techniques 

Notes

Acknowledgements

This work was supported by the National Natural Science of China (Grant numbers 41672362 and 41877264); the Key projects of Sichuan Provincial Department of Education (Grant numbers 16ZA0099); the State Key Laboratory of Geohazard Prevention & Geoenvironment Protection (Grant numbers SKLGP2017Z011). The experimental work discussed in this paper was conducted at Chengdu University of Technology. The authors would like to express their appreciation to the State Key Laboratory of Geohazard Prevention & Geoenvironment Protection for providing financial support for this project.

Compliance with ethical standards

Conflict of interest

All the authors agree to the submission of the paper, there are no conflicts of interest.

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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengdu University of TechnologyChengduChina
  2. 2.Sichuan Shu Tong Geotechnical Engineering CompanyChengduChina
  3. 3.China Southwest Architectural Survey and Design Institute Co., LtdChengduChina

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