CN116003062A - Foam concrete for backfilling gas transmission pipeline in tunnel and preparation method thereof - Google Patents
Foam concrete for backfilling gas transmission pipeline in tunnel and preparation method thereof Download PDFInfo
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- CN116003062A CN116003062A CN202211710877.0A CN202211710877A CN116003062A CN 116003062 A CN116003062 A CN 116003062A CN 202211710877 A CN202211710877 A CN 202211710877A CN 116003062 A CN116003062 A CN 116003062A
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- foam
- foam concrete
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- backfilling
- gas transmission
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 239000006260 foam Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004088 foaming agent Substances 0.000 claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000011398 Portland cement Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 9
- 238000007580 dry-mixing Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 238000005187 foaming Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 4
- 108010082495 Dietary Plant Proteins Proteins 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 235000021120 animal protein Nutrition 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Lining And Supports For Tunnels (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to foam concrete for backfilling a gas transmission pipeline in a tunnel, which comprises the following components in parts by weight: 40-55 parts of fly ash, 45-60 parts of ordinary Portland cement, 0.8-1.3 parts of water reducer and 0.7-1.2 parts of foaming agent. The preparation method comprises the following steps: (1) Uniformly dry-mixing fly ash and ordinary Portland cement, and adding water according to a water-cement ratio of 0.4-0.6; (2) Preparing a foaming agent, water and a water reducing agent, and uniformly stirring to prepare foam; (3) Adding the prepared foam into the prepared slurry, and uniformly mixing; (4) Pouring, filling and maintaining the obtained foam concrete slurry according to the requirements. By accurately controlling the mixing ratio of various raw materials and the volume ratio of slurry and foam, the strength and the density of the composite material are ensured to be moderate, the filling requirement of a gas pipeline in a tunnel is met, meanwhile, the filling material is ensured not to influence the pipeline inside due to buoyancy, and the engineering quantity and the cost required by pipeline maintenance are reduced.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to foam concrete for backfilling a gas pipeline in a tunnel and a preparation method thereof.
Background
In recent years, foam concrete is rapidly developed and becomes a widely applied material, and the foam concrete has the advantages of light weight, shock resistance, heat preservation, heat insulation, sound insulation, easy pouring and the like, is convenient and quick to construct, has relatively low construction cost, and is a good environment-friendly and energy-saving material.
At present, foam concrete related enterprises in China are numerous, the application is wide, and foam concrete blocks are mainly used as walls and retaining walls; compensating the foundation; as backfill material and other applications.
In the face of practical engineering of backfilling gas pipelines in tunnels, conventional filling materials often cannot meet the filling requirement due to over-high strength, over-small dead weight or over-large dead weight, poor fluidity and the like, and a material with moderate density and strength is needed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the foam concrete for backfilling the gas transmission pipeline in the tunnel and the preparation method thereof, and the density and the mixing ratio of the foam concrete are precisely controlled, so that the strength of the foam concrete is moderate on the premise of ensuring the material performance, the fixed-point maintenance and the maintenance requirements of the pipeline are met, the engineering quantity is reduced, and the cost is saved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
foam concrete suitable for backfilling gas transmission pipelines in tunnels comprises the following components in parts by weight: 40-55 parts of fly ash, 45-60 parts of ordinary Portland cement, 0.8-1.3 parts of water reducer and 0.7-1.2 parts of foaming agent;
the preparation method of the foam concrete for backfilling the gas pipeline in the tunnel comprises the following steps:
s1, uniformly dry-mixing fly ash and ordinary Portland cement, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer, and uniformly stirring;
s2, mixing 0.8 part of foaming agent and 150-300 parts of water, and adding the mixture into a foaming machine for foam preparation;
s3, adding the foam prepared in the step S2 into the slurry prepared in the step S1 according to the volume ratio of the slurry to the foam of 2-3, and adding the foam into the prepared slurry, and controlling the stirring time and the stirring rotating speed to uniformly mix the foam and the slurry.
And S4, pouring and filling the obtained foam concrete slurry according to requirements, and curing to finally obtain the foam concrete suitable for backfilling the gas transmission pipeline in the tunnel.
Further, the fly ash is class I fly ash.
Further, the water reducer is a polycarboxylic acid high-efficiency water reducer.
Further, the cement was P.O 42.5.42.5 ordinary Portland cement.
Further, the foaming agent is an animal protein or vegetable protein polymer composite foaming agent.
Further, in step S2, the concentration of the final foaming agent to be formulated is preferably 0.3% to 0.6% in order to ensure the foaming property and the foam stability of the foaming agent.
Further, in step S3, the stirring time should not be too long, and it is preferably controlled to be 120 to 150 seconds, in order to avoid foam loss.
Further, in step S3, a proper slurry-foam volume ratio is selected, and the final dry density of the foam concrete is controlled to be 1000-1300 kg/m 3 Preferably, the method comprises the steps of.
Further, in step S4, the foam concrete is naturally cured, and after pouring is completed, curing should be performed within 12 hours.
Compared with the prior art, the invention has the following beneficial effects: the foaming efficiency and the foam stability are improved, the quality of foam concrete is ensured, and the performance of the foam concrete is ensured to meet the filling requirement to the greatest extent; the uniformity of the internal materials of the foam concrete is ensured by strictly controlling the stirring time, and the utilization of the foam is ensured to be optimized, so that the dry density and the strength of the foam concrete are further ensured; the mixing ratio of various raw materials and the slurry-foam volume ratio of slurry and foam are accurately controlled, so that the strength and the density of the finally obtained foam concrete are moderate, the filling requirement of a gas pipeline in a tunnel is met, the filling material is ensured not to influence the pipeline inside due to buoyancy under certain emergency conditions, and the engineering quantity and the cost required by opening a filling layer before pipeline maintenance are greatly reduced.
Detailed Description
The embodiment 1 of the foam concrete for backfilling the gas transmission pipeline in the tunnel comprises the following components in parts by weight: 40 parts of fly ash, 60 parts of ordinary Portland cement, 1.2 parts of water reducer and 0.7 part of foaming agent.
The preparation method of the foam concrete for backfilling the gas transmission pipeline in the tunnel comprises the following steps:
s1, uniformly dry-mixing fly ash and ordinary Portland cement, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer, and uniformly stirring;
s2, mixing 0.8 part of foaming agent and 150-300 parts of water, and adding the mixture into a foaming machine for foam preparation;
s3, adding the foam prepared in the step S2 into the slurry prepared in the step S1 according to the volume ratio of the slurry to the foam of 2-3, and controlling the stirring time and the rotating speed to uniformly mix the two.
S4, injecting the obtained foam concrete slurry into a mould (100 mm multiplied by 100 mm) for molding, and naturally curing to finally obtain the foam concrete for backfilling the gas pipeline in the tunnel.
The embodiment 2 of the foam concrete for backfilling the gas transmission pipeline in the tunnel comprises the following components in parts by weight: 45 parts of fly ash, 55 parts of ordinary Portland cement, 1.2 parts of water reducer and 0.7 part of foaming agent, and the preparation method comprises the following steps:
s1, uniformly dry-mixing fly ash and ordinary Portland cement, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer according to a proportion, and uniformly stirring;
s2, adding water to prepare a foaming agent with the concentration of 0.3-0.6%, and adding the foaming agent into a foaming machine to prepare foam;
s3, taking the prepared foam according to the volume ratio of the pulp foam of 2-3, adding the foam into the prepared slurry, and controlling the stirring time and the rotating speed to uniformly mix the foam and the slurry.
S4, injecting the obtained foam concrete slurry into a mould (100 mm multiplied by 100 mm) for molding, and naturally curing to finally obtain the foam concrete for backfilling the gas pipeline in the tunnel.
The embodiment 3 is a foam concrete for backfilling a gas pipeline in a tunnel, and comprises the following components in parts by weight: 40 parts of fly ash, 60 parts of ordinary Portland cement, 1 part of water reducer and 0.9 part of foaming agent, and the preparation method comprises the following steps:
s1, uniformly dry-mixing fly ash and ordinary Portland cement, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer according to a proportion, and uniformly stirring;
s2, adding water to prepare a foaming agent with the concentration of 0.3-0.6%, and adding the foaming agent into a foaming machine to prepare foam;
s3, taking the prepared foam according to the volume ratio of the pulp foam of 2-3, adding the foam into the prepared slurry, and controlling the stirring time and the rotating speed to uniformly mix the foam and the slurry.
S4, injecting the obtained foam concrete slurry into a mould (100 mm multiplied by 100 mm) for molding, and naturally curing to finally obtain the foam concrete for backfilling the gas pipeline in the tunnel.
The embodiment 4 of the foam concrete for backfilling the gas transmission pipeline in the tunnel comprises the following components in parts by weight: 40 parts of fly ash, 60 parts of ordinary Portland cement, 0.9 part of water reducer and 1.2 parts of foaming agent, and the preparation method comprises the following steps:
s1, uniformly dry-mixing fly ash and ordinary Portland cement, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer according to a proportion, and uniformly stirring;
s2, adding water to prepare a foaming agent with a certain concentration, and adding the foaming agent into a foaming machine to prepare foam;
s3, taking the prepared foam according to the volume ratio of the pulp foam of 2-3, adding the foam into the prepared slurry, and controlling the stirring time and the rotating speed to uniformly mix the foam and the slurry.
S4, injecting the obtained foam concrete slurry into a mould (100 mm multiplied by 100 mm) for molding, and naturally curing to finally obtain the foam concrete for backfilling the gas pipeline in the tunnel.
The embodiment 5 is a foam concrete for backfilling a gas pipeline in a tunnel, and comprises the following components in parts by weight: 40 parts of fly ash, 60 parts of ordinary Portland cement, 1 part of water reducer and 1.2 parts of foaming agent, and the preparation method comprises the following steps:
s1, uniformly dry-mixing fly ash and ordinary Portland cement, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer according to a proportion, and uniformly stirring;
s2, adding water to prepare a foaming agent with the concentration of 0.3-0.6%, and adding the foaming agent into a foaming machine to prepare foam;
s3, taking the prepared foam according to the volume ratio of the pulp foam of 2-3, adding the foam into the prepared slurry, and controlling the stirring time and the rotating speed to uniformly mix the foam and the slurry.
S4, injecting the obtained foam concrete slurry into a mould (100 mm multiplied by 100 mm) for molding, and naturally curing to finally obtain the foam concrete for backfilling the gas pipeline in the tunnel.
The compressive strength test was performed for examples 1 to 5, and the specific experimental procedure was as follows:
test object: examples 1 to 5 were 100 mm. Times.100 mm cube standard test blocks prepared according to the corresponding methods.
The test method comprises the following steps: the test was carried out in the manner prescribed in the test method Standard for mechanical Properties of ordinary concrete (GB/T50081-2002), and the compressive strength of 7d/14d/28d was measured.
The specific performance results for examples 1-5 are shown in the following table:
Claims (10)
1. the foam concrete for backfilling the gas transmission pipeline in the tunnel is characterized by comprising the following components in parts by weight: 40-55 parts of fly ash, 45-60 parts of ordinary Portland cement, 0.8-1.3 parts of water reducer and 0.7-1.2 parts of foaming agent.
2. The method for preparing the foam concrete for backfilling the gas transmission pipeline in the tunnel according to claim 1, which is characterized by comprising the following steps:
s1, dry-mixing fly ash and ordinary Portland cement uniformly, adding water according to a water-cement ratio of 0.4-0.6, adding a water reducer, and uniformly stirring;
s2, mixing 0.8 part of foaming agent and 150-300 parts of water, and adding the mixture into a foaming machine for foam preparation;
s3, adding the foam prepared in the step S2 into the slurry prepared in the step S1 according to the volume ratio of the slurry to the foam of 2-3, and controlling the stirring time and the rotating speed to uniformly mix the two.
And S4, pouring and filling the obtained foam concrete slurry according to requirements, and curing to finally obtain the foam concrete for backfilling the gas transmission pipeline in the tunnel.
3. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: the fly ash is class I fly ash.
4. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: the water reducer is a polycarboxylic acid high-efficiency water reducer.
5. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: the Portland cement is P.O 42.5.42.5 ordinary Portland cement.
6. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: the foaming agent is an animal protein or vegetable protein polymer composite foaming agent.
7. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: in step S2, the concentration of the finally prepared foaming agent is preferably 0.3-0.6% in order to ensure the foaming performance and the foam stability of the foaming agent.
8. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: in step S3, the stirring time should not be too long, and is preferably controlled to be 120-150S in order to avoid foam loss.
9. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: in the step S3, proper slurry-foam volume ratio is selected, and the final dry density of the foam concrete is controlled to be 1000-1300 kg/m 3 Preferably, the method comprises the steps of.
10. The foam concrete for backfilling gas transmission pipelines in tunnels and the preparation method thereof are characterized in that: in the step S4, the foam concrete is naturally cured, and after pouring is completed, the foam concrete is cured within 12 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211710877.0A CN116003062A (en) | 2022-12-29 | 2022-12-29 | Foam concrete for backfilling gas transmission pipeline in tunnel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211710877.0A CN116003062A (en) | 2022-12-29 | 2022-12-29 | Foam concrete for backfilling gas transmission pipeline in tunnel and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116003062A true CN116003062A (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211710877.0A Pending CN116003062A (en) | 2022-12-29 | 2022-12-29 | Foam concrete for backfilling gas transmission pipeline in tunnel and preparation method thereof |
Country Status (1)
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| CN (1) | CN116003062A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040009150A (en) * | 2002-07-22 | 2004-01-31 | 한국건설기술연구원 | Manufacturing Method of Lightweight Foam Concrete for Backfilling of Cavities in Tunnel/Underground Structure using Stone Dust in Cake State |
| CN105016768A (en) * | 2015-06-29 | 2015-11-04 | 河南华泰建材开发有限公司 | Lightweight foam soil applied in subway station top board backfilling, and production method thereof |
| CN105036635A (en) * | 2015-06-29 | 2015-11-11 | 河南华泰建材开发有限公司 | Light foamed soil applied to backfill of tunnel entrance and exit and production method thereof |
-
2022
- 2022-12-29 CN CN202211710877.0A patent/CN116003062A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040009150A (en) * | 2002-07-22 | 2004-01-31 | 한국건설기술연구원 | Manufacturing Method of Lightweight Foam Concrete for Backfilling of Cavities in Tunnel/Underground Structure using Stone Dust in Cake State |
| CN105016768A (en) * | 2015-06-29 | 2015-11-04 | 河南华泰建材开发有限公司 | Lightweight foam soil applied in subway station top board backfilling, and production method thereof |
| CN105036635A (en) * | 2015-06-29 | 2015-11-11 | 河南华泰建材开发有限公司 | Light foamed soil applied to backfill of tunnel entrance and exit and production method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 刘存瑞等: ""棉籽蛋白质发泡剂在混凝土中的应用研究"", 《农产品加工》, pages 19 * |
| 李春宝等: ""天然气输气隧道填充泡沫混凝土抗压强度影响因素研究"", 《混凝土》, pages 184 * |
| 王武祥, 刘宁, 罗栓定: "泡沫混凝土在引黄工程洞穿管回填中的应用", 混凝土与水泥制品, no. 04 * |
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