Volume 40 Issue 2
Feb.  2023
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LIU Jie, LI Zheng, LI Zhao, et al. Hardening mechanism and pore size analysis of new magnetic epoxy cement grout[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 1025-1036. doi: 10.13801/j.cnki.fhclxb.20220324.002
Citation: LIU Jie, LI Zheng, LI Zhao, et al. Hardening mechanism and pore size analysis of new magnetic epoxy cement grout[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 1025-1036. doi: 10.13801/j.cnki.fhclxb.20220324.002

Hardening mechanism and pore size analysis of new magnetic epoxy cement grout

doi: 10.13801/j.cnki.fhclxb.20220324.002
Funds:  National Natural Science Foundation (52079071; 51979151); Fund for the Opening of Key Laboratory of Geological Disaster in the Three Gorges Reservoir Area by the Ministry of Education (2020KDZ08); Research Fund for Excellent Dissertation of China Three Gorges University (2021BSPY016)
  • Received Date: 2022-01-18
  • Accepted Date: 2022-03-12
  • Rev Recd Date: 2022-03-10
  • Available Online: 2022-03-25
  • Publish Date: 2023-02-15
  • Conventional mortar can not meet the engineering filling requirements of anti-inclined fractures and defects, and a large number of bubbles will be introduced under the pressure of grouting, and the density of slurry can not be guaranteed. In view of this, a new magnetic epoxy cement (MEC) slurry was developed, which can realize anti-gravity grouting anchoring, guided flow, increase of slurry density and real-time control of slurry viscosity. The SEM,XRD and N2 adsorption tests were used to analyze the microstructure, hydration products and pore size of MEC slurry under different magnetic fields. The results show that the MEC slurry can be divided into the following two hardening processes: Epoxy curing and cement hydration. The solidified product encapsulate the hydration product and ionize with Ca2+ in ettringite (AFt) and Ca(OH)2 to form a complex to fill the tiny pores in the slurry. When the magnetic field intensity increases from 400 GS to 6000 GS, the pore area and pore number decrease rate reach 77.6% and 76.8% respectively. The test of N2 adsorption shows that the number of mesopores and macropores and the specific surface area decrease significantly with the addition of magnetic field. The magnetic grout is in line with H4 hysteresis loop and mainly represents as ink bottle pores. Based on magnetic dipole theory, the force of magnetic particles is simulated numerically. The analysis results show that the pore area can be effectively reduced when the magnetic field intensity is from 2000 GS to 6000 GS.

     

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