Ore-powder-doped high-performance shotcrete applicable to underground watertight oil cellars and preparation method thereof
A technology of sprayed concrete and groundwater, which is applied in the field of high-performance shotcrete mixed with mineral powder and its preparation, which can solve the problems of stagnation, incomplete adaptation, and inapplicability to underground water-sealed oil depots, etc., and achieves extended service life, low cost, and high bond strength Effect
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[0034]The main raw materials are cement, mineral admixture, aggregate, water reducer, shrinkage reducer and accelerator. The cement is P.O.42.5 ordinary Portland cement. Mineral admixtures are S95 grade high-quality mineral powder and I grade fly ash. The S95 grade high-quality mineral powder adopted in this embodiment has a specific surface area of 450m 2 / kg, the 7-day activity index was 85%, the 28-day activity index was 108%, and the fluidity ratio was 103%; the water demand ratio of the Class I fly ash used in this example was 98%. The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the theoretical water reducing rate is 25%; the accelerator is an alkali-free liquid accelerator, and the solid content is 38%. The dosage of the accelerator in this embodiment is 6% of the mass of the cementitious material, which is cement and mineral admixtures.
[0035] The shrinkage reducing agent is mainly composed of 20% by weight polyacry...
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