A coal mine goaf filling paste prepared by using waste automobile tires and its preparation method
A technology for automobile tires and goafs, which is applied in the field of cemented filling materials, can solve the problems of high cost, narrow source, and low recycling rate of waste rubber, so as to reduce the filling cost, strengthen the flexural resistance, and improve the shrinkage resistance. Effect
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Embodiment 1
[0038] A method for preparing coal mine goaf filling paste by using waste automobile tires according to different materials, comprising the following steps:
[0039] The first step is to collect waste car tires, clean up impurities and dry them, and classify waste car tires according to the type of rubber;
[0040] The second step is to put different types of waste automobile tires into the ring cutting machine and cut them separately to obtain the bead and tread, put the tread into the rubber stripping machine for layering, and obtain the tread rubber, cord fabric layer and steel wire For the belt layer, cut the tread rubber into rectangular rubber strips, and cut the rectangular rubber strips into coarse rubber particles with a particle size of 5-15mm;
[0041] In the third step, the cord fabric layer and the steel wire belt layer are split and cut to obtain plastic fibers and steel fibers respectively;
[0042] The fourth step is to cut and split the bead to obtain bead st...
Embodiment 2
[0053] Prepare the filling paste according to the first group formula in Example 1, pour it into a 100mm×100mm×100mm test piece, demould it for 24 hours, and put it in a curing room with a temperature (20±2°C) and a relative humidity of 95% for 28 days.
[0054] Put the test piece into the concentration of 5%, 10%, 15% Na 2 SO 4 Completely immersed in the solution for 40d, another test piece was placed in the 2 SO 4 Completely soak in the solution for 40d, and measure its uniaxial compressive strength, the test results are as follows:
[0055]
[0056] It can be seen from the above table that although the strength of the filling paste prepared by using waste automobile tires is slightly lower than that of the paste filling material without rubber particles, it can significantly improve the paste’s resistance to sulfate in the downhole environment. Sulfate corrosion capability.
Embodiment 3
[0058] Four groups of filling pastes were prepared according to the formula and steps of Example 1.
[0059] The comparative example was prepared according to the following formula: coal gangue coarse aggregate 6kg, coal gangue fine aggregate 4kg, cement 2kg, fly ash 4kg, admixture 0.1kg, water 3.8kg.
[0060] The four groups of filling pastes of the present invention and the control example were respectively poured for 24 hours and then removed from the mold, placed in a curing room with a temperature of 20±2°C and a relative humidity of 95% for 28 days, and then placed in water with a temperature of 20±5°C After soaking for 24 hours, take it out, wipe off the surface moisture, and then conduct the flexural strength test of the sample. Three-point loading is used. The flexural strength of the specimen is calculated according to the following formula: Rc=3pl / 2bh 2 , where Rc is the flexural strength, p is the maximum failure load, l is the span, b is the width of the specime...
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