Early-strength expansion delayed type hole sealing material

A sealing material and strong expansion technology, applied in the field of sealing materials, can solve the problem that mining sealing materials cannot be directly dosed on site, and achieve the effect of improving expansion performance

Inactive Publication Date: 2018-02-02
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Finally, the present invention also solves the problem that the current mine sealing material cannot be directly prepared on site,

Method used

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  • Early-strength expansion delayed type hole sealing material
  • Early-strength expansion delayed type hole sealing material
  • Early-strength expansion delayed type hole sealing material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] Ordinary Portland cement: 63%; water: 35%; sodium chloride: 0.3%; sodium sulfate: 0.3%; triethanolamine: 0.04%; AMPS: 0.7%; sodium aluminate: 0.6%; aluminum powder microcapsules: 0.06%; the above substances are mixed and used according to mass percentage.

[0024] Using the sealing material of the present invention, ordinary Portland cement, and aluminum powder expansion agent cement, tests are conducted for early strength and expansion time. See Table 1:

[0025] Table 1 Performance test results of sealing materials

[0026]

[0027] Analysis of Table 1 shows:

[0028] Compared with ordinary Portland cement, this material has improved compressive strength. The one-day compressive strength is 3.8 times that of ordinary Portland cement. The early strength effect is significant. The early strength effect of cement-based materials after the addition of composite inorganic salts is great. The increase in amplitude. On the one hand SO 4 2- Ca(OH), product of hyd...

Example Embodiment

[0030] Example 2

[0031] Ordinary Portland cement: 63%; water: 35%; sodium chloride: 0.4%; sodium sulfate: 0.4%; triethanolamine: 0.03%; AMPS: 0.6%; sodium aluminate: 0.5%; aluminum powder microcapsules: 0.07%; the above substances are mixed and used according to mass percentage, the expansion delay time is 225min, and the 1-day compressive strength is 4.31MPa.

Example Embodiment

[0032] Example 3

[0033] Ordinary Portland cement: 65%; water: 33%; sodium chloride: 0.3%; sodium sulfate: 0.3%; triethanolamine: 0.04%; AMPS: 0.7%; sodium aluminate: 0.6%; aluminum powder microcapsules: 0.06%; the above substances are mixed according to the mass percentage, the expansion delay time is 252min, and the 1-day compressive strength is 4.05MPa.

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Abstract

The invention relates to an early-strength expansion delayed type hole sealing material. The early-strength expansion delayed type hole sealing material comprises, by weight, 1%-1.5% of inorganic early-strength admixtures, 0.01%-0.05% of organic early-strength admixtures, 0.3%-0.8% of water reducing agents, 0.01%-0.08% of micro-capsule expansion admixtures, 33%-35% of water and the balance cement.A process for preparing the early-strength expansion delayed type hole sealing material includes mixing the micro-capsule expansion admixtures, the early-strength admixtures, the water reducing agents and the water with the cement according to proportions and uniformly stirring the micro-capsule expansion admixtures, the early-strength admixtures, the water reducing agents, the water and the cement to obtain the early-strength expansion delayed type hole sealing material which is a finished product. A core material for the micro-capsule expansion admixtures is aluminum powder, and the micro-capsule expansion admixtures are prepared from water, water-soluble polymers and the aluminum water according to a mass ratio of 100:2-5:1-3 (wt). The early-strength expansion delayed type hole sealingmaterial has the advantages that the early-strength expansion delayed type hole sealing material is short in setting time and high in early strength, and invalid expansion and loss of expansion properties in cement hydration initial phases can be effectively reduced by delayed expansion; expansion of the early-strength expansion delayed type hole sealing material can be delayed by approximately 4h, the setting time of the early-strength expansion delayed type hole sealing material is shorter than 300 min, and the one-day compressive strength of the early-strength expansion delayed type holesealing material is 4.71 MPa; the early-strength expansion delayed type hole sealing material is low in cost and free of toxicity or pollution, and mine gas extraction hole drilling sealing and strength requirements can be completely met.

Description

technical field [0001] The invention relates to a hole-sealing material, in particular to an early-strength expansion-delayed hole-sealing material suitable for drilling holes in coal mine gas drainage. Background technique [0002] my country's coal resources account for a large proportion of energy utilization, while production, gas problems are also emerging. In order to reduce gas gushing, reduce gas accumulation, provide favorable conditions for mine ventilation, and provide a comfortable and safe environment for mine production, gas drainage has become particularly important. The key to gas drainage is to use suitable sealing materials, and the quality of sealing holes directly affects the efficiency of gas drainage. Chinese patent CN104817305A discloses an expansion-delayed mining sealing material prepared after the expansion agent is modified by microcapsules. The sealing material is composed of aluminum powder microcapsules, water, cement, polycarboxylate water red...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 刘健吉小利罗麒吴芬王其其
Owner ANHUI UNIV OF SCI & TECH
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