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Alkali-free liquid accelerator for effectively preventing sprayed concrete from crystallizing to block drainage system and preparation method of alkali-free liquid accelerator

A shotcrete and drainage system technology, applied in the field of construction engineering, can solve the problems of tunnel collapse, high cost, maintenance of the drainage system of the tunnel, etc., and achieve the effects of reducing the probability of calcium precipitation, improving blind pipe blockage, and high early strength.

Active Publication Date: 2022-01-18
中国铁路南宁局集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In areas with well-developed groundwater and obvious aquifers, tunnels often suffer from water leakage after a period of operation, and serious cases may even cause tunnel collapse, affecting driving safety
[0004] However, the tunnel drainage system is a concealed project. Once the secondary lining construction is completed, it will be difficult to maintain the tunnel drainage system. At present, when the drainage system is seriously blocked Lot, usually can only be drilled in the adjacent lot to release the water behind the lining, and then reset the dredge pipe
This kind of treatment method not only has high cost and affects the normal operation of the tunnel, but also treats the symptoms but not the root cause, and is in an infinite cycle of disease-treatment-re-disease-re-treatment

Method used

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  • Alkali-free liquid accelerator for effectively preventing sprayed concrete from crystallizing to block drainage system and preparation method of alkali-free liquid accelerator
  • Alkali-free liquid accelerator for effectively preventing sprayed concrete from crystallizing to block drainage system and preparation method of alkali-free liquid accelerator
  • Alkali-free liquid accelerator for effectively preventing sprayed concrete from crystallizing to block drainage system and preparation method of alkali-free liquid accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An alkali-free liquid quick-setting agent that effectively prevents shotcrete devitrification from clogging a drainage system, comprising the following raw materials in parts by mass:

[0036]

[0037] The preparation method of the microcapsule modifier is as follows:

[0038] 1) Dissolving 50g of polylactic acid in 100g of methylene chloride to obtain a capsule material solution;

[0039] 2) Slowly put 20g of activated carbon, 20g of EDTA, and 20g of citric acid into the capsule material solution sequentially under stirring at 100 rpm, finish adding in 2 hours, and after stirring for 2 hours, use ultrasonic waves with a frequency of 20kHz for 24 hours;

[0040] 3) Spray-dry the ultrasonicated mixture at 150° C. to obtain a microcapsule modifier.

[0041] The preparation method of the novel alkali-free liquid quick-setting agent that effectively prevents shotcrete crystallization from clogging the drainage system comprises the following steps:

[0042] Add 420g wat...

Embodiment 2

[0044] An alkali-free liquid quick-setting agent that effectively prevents shotcrete devitrification from clogging a drainage system, comprising the following raw materials in parts by mass:

[0045]

[0046] The preparation method of the microcapsule modifier is as follows:

[0047] 1) Dissolving 50g of polylactic acid in 100g of methylene chloride to obtain a capsule material solution;

[0048] 2) Slowly put 20g of ultrafine aluminum sulfate, 20g of zeolite, and 20g of citric acid into the capsule material solution under stirring at 80 rpm, and finish adding in 2 hours. After stirring for 2 hours, use ultrasonic waves with a frequency of 20kHz for 24 hours;

[0049] 3) Spray-dry the ultrasonicated mixture at 150° C. to obtain a microcapsule modifier.

[0050] The preparation method of the novel alkali-free liquid quick-setting agent that effectively prevents shotcrete crystallization from clogging the drainage system comprises the following steps:

[0051] Add 400g of w...

Embodiment 3

[0053] An alkali-free liquid quick-setting agent that effectively prevents shotcrete devitrification from clogging a drainage system, comprising the following raw materials in parts by mass:

[0054]

[0055] The preparation method of the microcapsule modifier is as follows:

[0056] 1) Dissolving 50g of polylactic acid in 100g of chloroform to obtain a capsule material solution;

[0057] 2) Slowly put 20g of activated carbon, 20g of zeolite, and 20g of succinic acid into the capsule material solution under stirring at 100 rpm, finish adding in 2 hours, and after stirring for 2 hours, use ultrasonic waves with a frequency of 20kHz for 24 hours;

[0058] 3) Spray-dry the ultrasonicated mixture at 150° C. to obtain a microcapsule modifier.

[0059] The preparation method of the novel alkali-free liquid quick-setting agent that effectively prevents shotcrete crystallization from clogging the drainage system comprises the following steps:

[0060] Add 430g of water, 50g of fe...

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Abstract

The invention provides an alkali-free liquid accelerator for effectively preventing sprayed concrete from crystallizing to block a drainage system and a preparation method of the alkali-free liquid accelerator. The alkali-free liquid accelerator is prepared from the following raw materials in parts by mass: 40.0-50.0 parts of an inorganic coagulation accelerating component, 2.0-3.0 parts of an organic coagulation accelerating component, 5.0-10.0 parts of organic alcohol amine, 10.0-15.0 parts of a nano early strength agent, 1.0-2.0 parts of a salt crystallization inhibitor, 5.0-10.0 parts of a microcapsule modifier and 40.0-45.0 parts of water. Compared with the prior art, through the compounding synergistic effect of the raw materials, the calcium precipitation probability is reduced from multiple aspects, including the modes of improving the saturation solubility of calcium hydroxide and calcium carbonate, physically / chemically adsorbing calcium ions, reacting with the calcium ions to generate hydration products such as ettringite, so that the phenomenon that calcium compounds in tunnel primary support sprayed concrete capillary pores flow into a blind pipe along with underground water or rock stratum water, crystals are separated out, and then the blind pipe is blocked is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to an alkali-free liquid accelerator and a preparation method thereof, which can effectively prevent shotcrete devitrification from clogging drainage systems, and can be widely used in shotcrete in various projects such as tunnels and mines. Background technique [0002] As the most important infrastructure in our country, tunnels play a very important role in railway rail transit, highways and other fields. The drainage system between the primary support and the secondary lining plays a very important role in the durability and safe operation of the tunnel. [0003] The function of the drainage system is to lead out the rock formation water and groundwater seeping behind the lining and introduce it into the side ditch of the road and discharge it out of the hole. In areas with well-developed groundwater and obvious aquifers, tunnels often suffer from w...

Claims

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Application Information

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IPC IPC(8): C04B24/30C04B24/32C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B24/02C04B24/122C04B22/06C04B24/124C04B22/002C04B24/285C04B14/022C04B24/123C04B24/06C04B22/085C04B14/047C04B22/149C04B22/08C04B24/085
Inventor 张嵛铭龙晖李寿锋付振华肖庆斌顾忠良
Owner 中国铁路南宁局集团有限公司
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