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A kind of setting controllable composite cement-based sealing material and its application method

A technology of sealing material and composite cement, which is applied in the field of mining sealing materials and composite cement-based early-strength, durable, and expansion-delayed sealing materials with controllable condensation. It can solve the problem of difficult matching of cement setting time and lag of aluminum powder gas , practical construction difficulties and other problems, to achieve the effect of controllable setting time, durable expansion duration and prolonging hydration time

Inactive Publication Date: 2017-10-10
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the strength of the cement material, about 10% of water-based epoxy resin needs to be added, which greatly increases the cost of the material
In addition, 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of a composite cement-based sealing material with controllable setting

[0019] ① Grind gypsum, slag, limestone, selected resin and sulphoaluminate cement clinker to a 0.08mm square hole sieve and store them in a single warehouse, and store Portland cement separately;

[0020] ② Mix the finely ground sulphoaluminate cement clinker with two or more resin polymer materials (phenolic resin, acrylic resin, latex powder, carboxymethyl cellulose, polyacrylamide, dextrin) for a total of 3.6 % mixing and grinding for 30min to obtain coated sulphoaluminate cement;

[0021] ③ 35% resin-coated sulfoaluminate cement and 38.7% Portland cement, 6% gypsum, 10% slag, 6% limestone, 3% bentonite, 0.3% industrial aluminum powder, 1.0% naphthalene-based water reducer Mixed for 25 minutes, bagged and sealed to obtain a composite cement-based sealing material with controllable condensation.

[0022] (2) Application method of a controllable setting composite cement-based sea...

Embodiment 2

[0027] (1) Preparation of a composite cement-based sealing material with controllable setting

[0028] ① Mix finely ground sulphoaluminate cement clinker with two or more resin polymer materials (phenolic resin, acrylic resin, latex powder, carboxymethyl cellulose, polyacrylamide, dextrin) for a total of 3.3 % mixing and grinding for 30min to obtain coated sulphoaluminate cement;

[0029] ② Mix 45% resin-coated sulfoaluminate cement with 34% Portland cement, 7% gypsum, 5% slag, 5% limestone, 3% bentonite, 0.2% industrial aluminum powder, and 0.8% melamine water reducer After 25 minutes, it was bagged and sealed to obtain a controllable condensation composite cement-based sealing material.

[0030] (2) Application method of a controllable setting composite cement-based sealing material

[0031] Mix the sealing material prepared above (1) with 60% water and stir evenly. Under standard conditions, the initial setting time (h:min) of the test slurry is 0:56; the final setting ti...

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Abstract

The invention relates to a condensation-controllable composite cement-based sealing material and an application method thereof. A certain ratio of sulphoaluminate-silicate composite cement system is used, and an appropriate amount of industrial aluminum powder, high-efficiency water reducer and resin polymer materials are added. Using the separate grinding technology, the sulphoaluminate cement clinker and the resin are firstly ground together, so that the fine resin particles are adsorbed on the surface of the mineral particles of the sulphoaluminate cement clinker. After the material is in contact with water during the construction process, the resin wrapped on the surface of the clinker particles interacts with water to form an interwoven coating film, which can slow release and control the hydration of calcium sulfoaluminate minerals, and adjust ettringite (AFt) and hydration The formation speed and amount of hydration products such as 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, provide the material with high early strength and compensate for silicate The hydration shrinkage of the phase enables the sealing material to be used continuously and for a long time.

Description

technical field [0001] The present invention relates to a mining sealing material, in particular to a condensation-controllable composite cement-based early-strength, durable, expansion-delayed sealing material suitable for sealing holes in shale gas and coal mine gas drainage and its application method , Belongs 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 seal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C09K8/467
CPCC04B28/06C04B2201/50C09K8/467C04B7/02C04B22/143C04B18/141C04B14/28C04B14/104C04B22/04C04B2103/302
Inventor 刘晓存李艳君孔德龙
Owner UNIV OF JINAN
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