Ultrafine inorganic grouting material for tunnel inverted arches, and preparation method thereof

A slurry grouting and inorganic technology, which is applied in the field of ultra-fine inorganic grouting for tunnel inverted arches and its preparation, can solve the problems of decreased consolidation strength, easy bleeding and segregation, and inability to form a consolidated body, and achieves elimination of water consumption and Dispersion, ensuring volume stability, and the effect of good volume stability

Active Publication Date: 2018-12-18
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-liquid ordinary cement grouting is a cement slurry mixed with cement and water at a mass ratio of 1:0.35 to 0.50. The slurry has poor stability, is prone to bleeding and segregation, and shrinks in volume after hardening. The specific surface area of ​​cement is generally 350m 2 / kg or so, the particles are relatively large, the prepared cement slurry is relatively rough, it is difficult to penetrate into the depth of micro cracks below 0.05mm, and the impermeability of the overall structure cannot be guaranteed.
The grouting material containing water glass will have a large linear shrinkage after curing, which seriously affects the long-term stability of the grouting effect, and the chemical structure is unstable. The body is pulverized, the consolidation strength is reduced, and the dissolved sodium ions will also pollute water resources
In short, the grouting quality of the current inorganic grouting material is difficult to guarantee, and it cannot play a good role in rectifying the quality defects of the tunnel inverted arch, endangering the safety of the tunnel structure and the service life of the tunnel

Method used

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  • Ultrafine inorganic grouting material for tunnel inverted arches, and preparation method thereof
  • Ultrafine inorganic grouting material for tunnel inverted arches, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] An ultrafine inorganic grouting material for tunnel inverts, the preparation method of which comprises the following steps:

[0035] 1) Weigh each raw material according to the proportion, each raw material and its dosage include: 75kg of superfine cementitious material (58.5kg of ordinary portland cement, 16.5kg of low alkalinity sulphoaluminate cement), 16.06kg of mineral filler (fine talc powder 14.36kg, sepiolite powder 1.7kg), composite expansion agent 2.5kg (calcined magnesia 2kg, ammonium nitrite 0.5kg), fluid volume stabilizer 0.04kg (sodium polyacrylate 0.02kg, kelp root 0.02kg), and 0.5kg of membrane modifier (0.5kg of carboxymethyl starch), 0.43kg of water reducer, 0.02kg of defoamer, 0.35kg of dispersant, 0.1kg of anti-seepage and water repellent, and 5kg of nano-enhanced components;

[0036] 2) Put the weighed mineral filler, composite expansion agent, flow volume stabilizer, film-forming modifier, water reducer, defoamer, dispersant, anti-seepage water repel...

Embodiment 2

[0039] An ultrafine inorganic grouting material for tunnel inverts, the preparation method of which comprises the following steps:

[0040] 1) Weigh each raw material according to the proportion, each raw material and its dosage include: 78kg of superfine cementitious material (62.5kg of ordinary portland cement, 15.5kg of low alkalinity sulphoaluminate cement), 12.62kg of mineral filler (fine talc powder 11.12kg, sepiolite powder 1.5kg), composite expansion agent 3.7kg (calcined magnesia 3kg, ammonium nitrite 0.7kg), fluid volume stabilizer 0.05kg (sodium polyacrylate 0.03kg, kelp root 0.02kg), and 0.7kg of membrane modifier (0.7kg of phosphate starch), 0.52kg of water reducer, 0.03kg of defoamer, 0.3kg of dispersant, 0.08kg of anti-seepage and water repellent, and 4kg of nano-enhanced components;

[0041] 2) Put the weighed mineral filler, composite expansion agent, flow volume stabilizer, film-forming modifier, water reducer, defoamer, dispersant, anti-seepage water repelle...

Embodiment 3

[0044] An ultrafine inorganic grouting material for tunnel inverts, the preparation method of which comprises the following steps:

[0045] 1) Weigh each raw material according to the proportion, and each raw material and its dosage include: 83kg of superfine cementitious material (66kg of ordinary Portland cement, 17kg of low-alkalinity sulphoaluminate cement), 7.18kg of mineral filler (5.98kg of fine talc powder kg, sepiolite powder 1.2kg), composite expansion agent 4.9kg (calcined magnesia 4kg, ammonium nitrite 0.9kg), fluid volume stabilizer 0.06kg (sodium polyacrylate 0.03kg, kelp root 0.03kg), film-forming 0.9kg of agent (0.4kg of carboxymethyl starch, 0.5kg of phosphate starch), 0.61kg of water reducer, 0.04kg of defoamer, 0.25kg of dispersant, 0.06kg of anti-seepage and water repellent, and 3kg of nano-enhanced components;

[0046] 2) Put the weighed mineral filler, composite expansion agent, flow volume stabilizer, film-forming modifier, water reducer, defoamer, dispe...

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Abstract

The invention discloses an ultrafine inorganic grouting material for tunnel inverted arches. The grouting material comprises, by mass, 75-90% of an ultrafine cementing material, 5-20% of a mineral filler, 2.5-7.5% of a composite expansion agent, 0.04-0.08% of a fluid volume stabilizer, 0.5-1.5% of a film forming modifier, 0.4-0.8% of a water reducer, 0.02-0.05% of a defoamer, 0.1-0.4% of a dispersant, 0.05-0.1% of an anti-seepage water repellent and 1-5% of a nano-reinforcing component. Above components are uniformly mixed, water is added according to a water-cement ratio of 0.25-0.30, and stirring is performed to obtain the grouting material which can be used for grouting reinforcement portions and defect parts of the tunnel inverted arches. The inorganic grouting material obtained in theinvention is suitable for repairing and stabilizing defects and dangerous rock bodies of tunnel inverted arches at 5-35 DEG C, has the advantages of high fluidity, high bonding strength, no shrinkage, good impermeability and good durability, and is suitable for being promoted and applied.

Description

technical field [0001] The invention belongs to the technical field of cement-based grouting materials, and in particular relates to an ultrafine inorganic grouting material for tunnel inverted arches and a preparation method thereof. Background technique [0002] The inverted arch is one of the main components of the tunnel structure, and it is also the foundation structure of the tunnel. It plays the role of improving the stress conditions of the upper structure of the tunnel and resisting the reaction force transmitted by the lower layer of the tunnel, thereby increasing the overall stability of the tunnel structure. Due to the complex geological conditions of most tunnels, and the long-term impact of heavy loads and groundwater erosion, it is easy to cause damage to the base rock of the inverted arch of the tunnel, the settlement and cracking of the tunnel floor and ballast bed, water accumulation in the ballast bed, and mud pouring, etc. Diseases; limited by the level o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/10C04B2201/50C04B7/02C04B14/042C04B22/066C04B22/085C04B24/2641C04B24/001C04B24/38C04B24/125C04B24/42C04B14/305C04B24/32
Inventor 朱艳超赵河闯韩升苑跃辉
Owner HUBEI UNIV
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