Calcium sulfoaluminate mineral modified cement-based sealing material and application method thereof
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A technology of calcium sulfoaluminate minerals and sealing materials, which is applied in the field of mining sealing materials and calcium sulfoaluminate mineral modified cement-based early-strength and durable expansion-delayed sealing materials. Difficult construction, high cost and other problems, to achieve the effect of reducing the amount of resin, improving coating efficiency and delaying hydration
Inactive Publication Date: 2018-02-23
UNIV OF JINAN
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In order to ensure the strength of the cement material, it is necessary to add about 10% water-based epoxy resin, which greatly increases the cost of the material, and the aluminum powder gas lags behind, and the setting time of the cement is not easy to match, which brings difficulties to the actual construction.
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Embodiment 1
[0018] (1) Preparation of a calcium sulfoaluminate mineral modified cement-based sealing material
[0019] ① Grind gypsum, slag, limestone, selected resin and calcium sulfoaluminate until the sieve residue of 0.08mm square hole is less than 10%, and store them in single warehouses, and store Portland cement separately;
[0020] ② Mix finely ground calcium sulfoaluminate with two or more resinous polymer materials (phenolic resin, acrylic resin, latex powder, carboxymethyl cellulose, polyacrylamide, dextrin) in a total of 8% powder Grind for 30 minutes to obtain coated calcium sulfoaluminate minerals;
[0021] ③Combine 15% resin-coated calcium sulfoaluminate mineral with 55% Portland cement, 7% gypsum, 13.8% slag, 5% limestone, 3% bentonite, 0.2% industrial aluminum powder, 1.0% naphthalene-based water reducer Mixed for 25 minutes, bagged and sealed to prepare calcium sulfoaluminate mineral modified cement-based sealing material.
[0022] (2) An application method of calcium ...
Embodiment 2
[0026] (1) Preparation of a calcium sulfoaluminate mineral modified cement-based sealing material
[0027] ① Mix finely ground calcium sulfoaluminate with two or more resinous polymer materials (phenolic resin, acrylic resin, latex powder, carboxymethyl cellulose, polyacrylamide, dextrin) in a total of 7% powder Grind for 30 minutes to obtain coated calcium sulfoaluminate minerals;
[0028] ② Mix 18% resin-coated calcium sulfoaluminate mineral with 55% Portland cement, 8% gypsum, 9.7% slag, 5% limestone, 3% bentonite, 0.3% industrial aluminum powder, and 1.0% melamine water reducer After 25 minutes, it was bagged and sealed to prepare calcium sulfoaluminate mineral modified cement-based sealing material.
[0029] (2) An application method of calcium sulfoaluminate mineral modified cement-based sealing material
[0030] Mix the sealing material prepared in the above (1) with 60% water and stir evenly. Under standard conditions, the initial setting time (h:min) of the test slu...
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Abstract
The invention relates to a calcium sulfoaluminate mineral-modified cement-based sealing material and an application method thereof. The calcium sulfoaluminate is used to strengthen a portland cement composite system, and aluminum powder is used as an air-generating agent. The present invention adopts the single mineral coating technology, preferentially grinds the calcium sulfoaluminate and the resin together, so that the fine resin particles are adsorbed on the surface of the calcium sulfoaluminate particles, and plays a certain coating effect, which can effectively reduce the amount of resin and improve the coating. coverage efficiency. After the material is in contact with water during the construction process, the resin wrapped on the surface of calcium sulfoaluminate reacts with water to form an interwoven coating film, which can slow release and control the hydration of calcium sulfoaluminate, and adjust the needle-like hydration of calcium sulfoaluminate and The formation speed and amount of products such as hydrated aluminate can effectively delay the setting time of the sealing material, facilitate construction, and endow the sealing material with continuous micro-expansion in the sealing hole. It provides the material with high early strength and compensates the hydration shrinkage of the silicate phase, so that the sealing material can be used continuously and durablely.
Description
technical field [0001] The invention relates to a mining sealing material, in particular to a calcium sulfoaluminate mineral (3CaO·3Al 2 o 3 ·CaSO 4 ) The invention discloses a modified cement-based early-strength durable expansion-delayed sealing material and an application method thereof, which belong to the technical field of mining. Background technique [0002] At present, the sealing materials mainly used in mining sealing at home and abroad are polyurethane foam materials and ordinary cement mortar. Polyurethane material belongs to chemical grouting material, its operation process is simple, the sealing speed is fast, the expansion ratio is high, and it has a certain sealing effect on coal cracks, so it is popular. However, the expansion effect of polyurethane products is easily affected by a series of reasons such as temperature, moisture, and compounding ratio, and the length of the sealing hole cannot reach the ideal sealing state, resulting in high sealing cost...
Claims
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Application Information
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