Abstract
To overcome the problems of poor toughness and ease of cracking failure of inorganic spraying materials for gas sealing, this study proposes to modify traditional cement-based materials through the addition of slag, CaSO4 whiskers and MgO. The optimal composition of the high-performance sealing material (HPSM) was determined to be a mass ratio of slag to cement of 0.5, and CaSO4 whisker and MgO content of 7.5 wt% and 2.5 wt%, respectively. The results showed that: (1) slag participates in the hydration reaction; (2) CaSO4 whiskers promotes slag to form needle-like ettringite crystals, which increases the ability of HPSM to withstand bending and resist matrix shrinkage; (3) MgO is slowly hydrated in the connected pores of the system to form MgCO3 which fills the pores and increases the matrix strength; (4) when HPSM cracks, unreacted CaO in the crack produces a large amount of CaCO3 humid environments, which promote the self-healing of cracks. The results of small-scale gas sealing tests showed that HPSM can completely plug the gas at pressures of ≤0.075 MPa after 1 day and with a coating thickness of 5–10 mm.
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