Method for reinforcing pre-controlled roof room pillar method ore pillars
A ore pillar and slag technology, which is applied in the field of reinforcement and pre-control roof pillar reinforcement, can solve the problems of increasing mining loss and dilution rate, increasing difficulty in mining ore bodies, and threatening the safety of operators. The effect of improving the reinforcement effect, improving the supporting effect, and shortening the installation time
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Embodiment 1
[0072] A kind of grouting slurry, comprising liquid A and liquid B with a volume ratio of 1:1, wherein,
[0073] -Liquid A, by weight percentage, includes 52% of 42.5 grade Portland cement, 33% of fly ash, 4.5% of slag, 1.2% of aluminum dihydrogen phosphate and 2.4% of sodium hexametaphosphate, and the water-cement ratio is 0.8; , the chemical composition of cement, fly ash and slag is shown in Table 1, and the particle size is shown in Table 2;
[0074] -Liquid B, by weight percentage, comprises water glass 22%, fly ash 16% and surplus water; Wherein, the concentration of water glass is 25-35 Baume degrees, and the amount of unburned carbon in fly ash is 12.3wt% , the particle size D50 is 22.4 μm.
[0075] The chemical composition (wt%) of table 1 raw material
[0076] raw material silica Aluminum oxide iron oxide Calcium Oxide magnesium oxide sulphur trioxide LOSS f-CaO cement 22.82 4.53 2.63 63.07 1.83 2.71 1.63 0.69 fly ash 52.4...
Embodiment 2
[0084] A kind of grouting slurry, comprising liquid A and liquid B with a volume ratio of 1:1, wherein,
[0085] -Liquid A, by weight percentage, comprises 42.5 grade Portland cement 52%, fly ash 33%, slag 4.5%, aluminum dihydrogen phosphate 1.2% and sodium hexametaphosphate 2.0%, water-cement ratio is 0.8; , the chemical composition and particle size of cement and fly ash are shown in Table 1 and Table 2 respectively;
[0086] -Liquid B, by weight percentage, comprises 22% of water glass, 28% of fly ash and the balance of water; wherein, the concentration of water glass is 35 degrees Baume, and the amount of unburned carbon in fly ash is 12.3wt%. The diameter D50 is 22.4 μm.
[0087] The preparation method of the grouting slurry is the same as Example 1.
Embodiment 3
[0089] A kind of grouting slurry, comprising liquid A and liquid B with a volume ratio of 1:1, wherein,
[0090] - Liquid A, by weight percentage, including 52% of 42.5 grade Portland cement, 33% of fly ash, 4.5% of slag, 2.0% of aluminum dihydrogen phosphate and 3.0% of sodium hexametaphosphate, and the water-cement ratio is 0.7-1.1 ; Wherein, the chemical composition and particle size of cement and fly ash are shown in Table 1 and Table 2 respectively;
[0091] -Liquid B, by weight percentage, comprises 22% of water glass, 5% of fly ash and the balance of water; wherein, the concentration of water glass is 35 degrees Baume, and the amount of unburned carbon in fly ash is 12.3wt%. The diameter D50 is 22.4 μm.
[0092] The preparation method of the grouting slurry is the same as Example 1.
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