CN106986593A - A kind of preparation method of earth source heat pump drilling backfilling material - Google Patents
A kind of preparation method of earth source heat pump drilling backfilling material Download PDFInfo
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- CN106986593A CN106986593A CN201710224767.6A CN201710224767A CN106986593A CN 106986593 A CN106986593 A CN 106986593A CN 201710224767 A CN201710224767 A CN 201710224767A CN 106986593 A CN106986593 A CN 106986593A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/024—Graphite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The present invention provides the preparation method that a kind of earth source heat pump drills backfilling material, a kind of high performance ground heat exchanger backfilling material is made using industrial tailings, higher heat-conductive characteristic is made it have, while having preferable mobility, water-retaining property, microdilatancy and stronger impermeability.It is made up of the raw material of following parts by weight：1.0 parts of portland cement, 0 0.3 parts of flyash, 0.1 0.3 parts of slag micro powder, 0 0.1 parts of graphite powder, 0 0.01 parts of defoamer, 0.05 0.15 parts of swelling agent, 0.05 0.15 parts of bentonite, 0.002 0.020 parts of water reducer, 1.0 3.0 parts of slag fine aggregate, 0.27 0.60 parts of water.Preferably economic, the social and obvious environment benefit obtained.Step is simple and convenient to operate, practical.
Description
Technical field
The invention belongs to earth source heat pump field, more particularly to a kind of preparation method of earth source heat pump drilling backfilling material.
Background technology
Earth source heat pump is to make use of earth surface geothermal resource as Cooling and Heat Source, carries out the heating air conditioning of energy exchange
System.Geothermal energy resources are to have a large capacity and a wide range, and are a kind of regenerative resources of cleaning.Researchers are commonly held that, in current and general
Come, geothermal heat pump air-conditioning system is most promising energy saver and system, is the important form of geothermal utilization.Backfill is buried
Important link in heat exchange of heat pipe work progress, i.e., finish in drilling, under after complete U-tube, backfilling material is injected into drilling.
It is between the pipe laying and the wall of a borehole of ground heat exchanger, for strengthening the heat exchange of pipe laying and surrounding ground；Backfilling material
Selection and correct backfill construction are for ensureing that the performance of ground heat exchanger has important meaning.
Earth source heat pump needs to drill in the earth formation, and aperture is typically between 102mm to 152mm, and hole depth is in 60m to 100m.
A high density polyethylene (HDPE) U-tube being placed in drilling is used as collecting the circulation duct of hot fluid, last boring pumpability
Slurry backfill.Backfilling material is the Heat transmission medium between heat exchanger and surrounding formation.In the certain situation of strata condition
Under, it is desirable to drilling depth and the first mounting cost thus brought be dependent on the thermal conduction characteristic of backfilling material.
Backfilling material is except in addition to the requirement in terms of heat transfer, it is necessary to be reality it is available, it is environment-friendly and compared with
Low cost, because the bore diameter of ground heat exchanger is smaller, and is furnished with U-tube has or double u-tube, to backfilling material
Pumping bring great challenge, this requires it to have preferable mobility and water-retaining property.Cement-based material can be changed
Learn to shrink and dry and shrink, cause between backfilling material and stratum ground, gap is produced between U-tube, this can cause these
Thermal contact resistance between contact surface is increased, and influences heat-transfer effect, and this requires backfilling material to possess microdilatancy and good
Bonded with U-tube and surrounding formation, farthest reduce thermal contact resistance.Backfilling material is not only the medium of heat transfer, simultaneously
Or sealing material, it is desirable to which it possesses relatively low permeability, it is to avoid pollution and underground different water cut of the surface water to underground water
Cross pollution between layer.The purpose of this project research is exactly to make a kind of high performance underground pipe using industrial tailings to exchange heat
Device backfilling material, makes it have higher heat-conductive characteristic, while having preferable mobility, water-retaining property, microdilatancy and stronger
Impermeability.
Backfilling material is the Heat transmission medium between heat exchanger and surrounding formation.In the case where strata condition is certain,
It is required that drilling depth and the first mounting cost thus brought be dependent on the thermal conduction characteristic of backfilling material.But it is existing
Backfilling material thermal conductivity needs further raising, and cost is higher.
The content of the invention
In order to overcome above-mentioned deficiency, the present invention provides the preparation method that a kind of earth source heat pump drills backfilling material.Utilize work
Industry mine tailing makes a kind of high performance ground heat exchanger backfilling material, makes it have higher heat-conductive characteristic, has simultaneously
There are preferable mobility, water-retaining property, microdilatancy and stronger impermeability.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of earth source heat pump drilling backfilling material, is made up of the raw material of following parts by weight：1.0 parts of portland cement, fine coal
It is grey 0-0.3 parts, 0.1-0.3 parts of slag micro powder, 0-0.1 parts of graphite powder, 0-0.01 parts of defoamer, 0.05-0.15 parts of swelling agent, swollen
Moisten 0.05-0.15 parts of soil, 0.002-0.020 parts of water reducer, 1.0-3.0 parts of slag fine aggregate, 0.27-0.60 parts of water.
It is preferred that, it is made up of the raw material of following parts by weight：1.0 parts of portland cement, 0-0.15 parts of flyash, slag micro powder
0.1-0.2 parts, 0-0.05 parts of graphite powder, 0-0.005 parts of defoamer, 0.05-0.10 parts of swelling agent, 0.05-0.10 parts of bentonite,
0.002-0.010 parts of water reducer, 1.0-2.0 parts of slag fine aggregate, 0.27-0.45 parts of water.
It is preferred that, it is made up of the raw material of following parts by weight：1.0 parts of portland cement, 0.15-0.3 parts of flyash, slag are micro-
0.2-0.3 parts of powder, 0.05-0.1 parts of graphite powder, 0.005-0.01 parts of defoamer, 0.10-0.15 parts of swelling agent, bentonite 0.10-
0.15 part, 0.010-0.020 parts of water reducer, 2.0-3.0 parts of slag fine aggregate, 0.45-0.60 parts of water.
It is preferred that, the portland cement is Portland cement, Portland fly ash cement, pozz portland water
Mud, portland slag cement or composite Portland cement；Strength grade >=42.5 of the portland cement.
It is preferred that, the specific surface area of the slag micro powder is 350-500kg/m3, 0.08mm tail over percentage composition≤
5.0%.
It is preferred that, the graphite powder is crystalline graphite powder.
It is preferred that, particle diameter≤1.18mm of the slag fine aggregate.
It is preferred that, the viscosity of the defoamer is more than 800Pa.s；
It is preferred that, the swelling agent is UEA swelling agents, swelling agent 7d limited expansion rate >=0.025% in water；
It is preferred that, the bentonite is calcium base or sodium bentonite, expansion capacity >=20ml/g；
It is preferred that, how the water reducer is is or polycarboxylate water-reducer, water-reducing rate >=20%.
Present invention also offers a kind of preparation method of earth source heat pump drilling backfilling material, including：
Cement, flyash, slag micro powder, slag aggregate and powdered additive is proportionally dry-mixed uniform, add water and stir
Mix 2-4min uniform to slurry, add liquid additive and stir 2-4min to uniform, produce；
The additive includes：Graphite powder (powdery), bentonite (powdery), defoamer (powdery), swelling agent (powdery), subtract
Aqua (powdery or liquid).
Present invention also offers application of the above-mentioned backfilling material in geothermal heat pump air-conditioning system construction.
Beneficial effects of the present invention
First, economic benefit：
It is energy-efficient, effectively reduce the initial cost and operating cost of earth-source hot-pump system.
1) using this technology backfilling material can make drilling thermal resistance reduce 20%-50%, effectively improve energy-saving effect, up to
In the case of identical energy-saving effect, can make the initial cost and operating cost of system effectively reduces, with significant economic benefit.
2) industrial by-products slag is utilized, cost is effectively reduced.
2nd, social benefit：Obvious environment benefit
1) impervious requirement is proposed, it is therefore prevented that the surface water is by drilling to subsurface wastewater infiltration system, to protect underground water not by ground
The pollution of table pollutant, and prevent the cross pollution between each aquifer.
2) earth source heat pump, is a kind of sustainable development " green device ", the selection of backfilling material and correct backfill
Construct for ensureing that the performance of ground heat exchanger has important meaning, meet the strategy of sustainable development.
3) industrial by-products slag is utilized, the discharge of solid waste is reduced, with significant social benefit.
4) preparation method of the present invention is simple, raw material is easy to get, practical, it is easy to promote.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
The purpose of the present invention one：
1) thermal conductivity of graphite powder exceedes the metal materials such as steel, iron, lead；
2) heat conductivility of slag is excellent, according to its particle diameter, can be used as fine aggregate and admixture, is improving heat conductivility
While, reduce cost.
Using above-mentioned two key technology, thermal conductivity factor up to 2.65W/mK is prepared, while having excellent apply
Work performance, microdilatancy, impervious excellent high-performance backfilling material.
Technical scheme：
Formula：
Common portland cement, flyash, slag micro powder, graphite powder, defoamer, swelling agent, bentonite, water reducer, steel
Slag fine aggregate, water.
Above each component mass ratio is：1：0-0.3,0.1-0.3,0-0.1,0-0.01,0.05-0.15,0.05-0.15,
0.002-0.020,1-3.0,0.27-0.60。
Cement：Portland cement, Portland fly ash cement, portland-pozzolan cement, portland slag cement,
One kind in composite Portland cement, strength grade >=42.5.
Flyash：II grades and above flyash；
Slag micro powder：0.08mm tails over percentage composition≤5.0%, specific surface area 350-500kg/m3；
Graphite powder：Crystalline graphite powder；
Defoamer：Nontoxic, tasteless, viscosity is more than 800Pa.s；
Swelling agent：7d limited expansion rate >=0.025% in UEA swelling agents, water；
Bentonite：Calcium base or sodium bentonite, expansion capacity >=20ml/g；
Water reducer：How be or polycarboxylate water-reducer, water-reducing rate >=20%；
Slag fine aggregate：Particle diameter≤1.18mm, grading of aggregates need to meet table 1 below requirement.
Table 1
| Screen size/mm | It is accumulative to tail over/% |
| 1.18 | 0 |
| 0.6 | 40-16 |
| 0.3 | 85-55 |
| 0.15 | 90-100 |
Water：Clean running water.
The additive of cement, flyash, slag micro powder, slag aggregate and powdery is proportionally dry-mixed uniform, add water
Stir 2-4min uniform to slurry, add liquid additive and stir 2-4min to uniform.
The properties of product of the present invention：
Fluidity：Initially：>=280mm, 30min >=260mm
Compression strength：28d≥45Mpa
Water retention：>=95%
Seepage-resistant grade：≥P8
Thermal conductivity factor：2.10-2.65W/(m·K)
Vertical expansion ratio：3h >=0.02%
24h and 3h differences 0.02-0.5%
Embodiment 1
Raw material：Common portland cement, flyash, slag micro powder, graphite powder, defoamer, swelling agent, bentonite, subtract
Aqua, slag fine aggregate, water.
Above each component mass ratio is：1,0.2,0.2,0.1,0.01,0.08,0.05,0.004,1.5,0.43.
Cement：Portland cement, strength grade 52.5.
Flyash：I grades of flyash
Slag micro powder：0.08mm tails over percentage composition 0.6%, specific surface area 450kg/m3
Graphite powder：Crystalline graphite powder
Defoamer：Organic silicon defoamer, nontoxic, tasteless, viscosity is 1500Pa.s.
Swelling agent：7d limited expansion rates 0.03% in UEA swelling agents, water.
Bentonite：Sodium bentonite, expansion capacity is 40ml/g.
Water reducer：Polycarboxylate water-reducer, water-reducing rate is 30%.
Aggregate：Particle diameter≤1.18mm, grading of aggregates is shown in Table 2 requirements.
Table 2
| Screen size/mm | It is accumulative to tail over/% |
| 1.18 | 0 |
| 0.6 | 25 |
| 0.3 | 68 |
| 0.15 | 97 |
Water：Clean running water.
The additive of cement, flyash, aggregate and powdery is dry-mixed uniform, and addition water stirring 2-4min is uniform to slurry,
Add liquid additive and stir 2-4min to uniform.
Properties of product：
Fluidity：Initially：290mm, 30min：270mm
Compression strength：28d=90.2Mpa
Vertical expansion ratio：3h：0.03%
24h and 3h differences 0.04%
Water retention：99%
Seepage-resistant grade：P10
Thermal conductivity factor：2.65W/(m·K)
Embodiment 2：
Raw material：Common portland cement, flyash, slag micro powder, graphite powder, defoamer, swelling agent, bentonite, subtract
Aqua, slag fine aggregate, water.
Above each component mass ratio is：1：0.3,0.3,0.02,0.005,0.08,0.08,0.008,1.5,0.55.
Cement：Portland cement, strength grade 42.5.
Flyash：II grades of flyash
Slag micro powder：：0.08mm tails over percentage composition 0.8%, specific surface area 410kg/m3
Graphite powder：Crystalline graphite powder
Defoamer：Organic silicon defoamer, nontoxic, tasteless, viscosity is 1000Pa.s.
Swelling agent：7d limited expansion rates 0.030%. in UEA swelling agents, water
Bentonite：Calcium-base bentonite, expansion capacity is 20ml/g.
Water reducer：How based water reducer, water-reducing rate is 20%.
Slag fine aggregate：Particle diameter≤1.18mm, grading of aggregates is shown in Table 3 requirements.
Table 3
| Screen size/mm | It is accumulative to tail over/% |
| 1.18 | 0 |
| 0.6 | 32 |
| 0.3 | 77 |
| 0.15 | 97 |
Water：Clean running water.
The additive of cement, flyash, aggregate and powdery is dry-mixed uniform, and addition water stirring 2-4min is uniform to slurry,
Add liquid additive and stir 2-4min to uniform.
Properties of product：
Fluidity：Initially：300mm, 30min：280mm
Compression strength：28d=50.1Mpa
Vertical expansion ratio：3h：0.03%
24h and 3h differences 0.08%
Water retention：98%
It is impervious：P8
Thermal conductivity factor：2.25W/(m·K).
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
- The backfilling material 1. a kind of earth source heat pump drills, it is characterised in that be made up of the raw material of following parts by weight：Portland cement 1.0 parts, 0-0.3 parts of flyash, 0.1-0.3 parts of slag micro powder, 0-0.1 parts of graphite powder, 0-0.01 parts of defoamer, swelling agent 0.05-0.15 parts, 0.05-0.15 parts of bentonite, 0.002-0.020 parts of water reducer, 1.0-3.0 parts of slag fine aggregate, water 0.27- 0.60 part.
- 2. backfilling material as claimed in claim 1, it is characterised in that be made up of the raw material of following parts by weight：Portland cement 1.0 parts, 0-0.15 parts of flyash, 0.1-0.2 parts of slag micro powder, 0-0.05 parts of graphite powder, 0-0.005 parts of defoamer, swelling agent 0.05-0.10 parts, 0.05-0.10 parts of bentonite, 0.002-0.010 parts of water reducer, 1.0-2.0 parts of slag fine aggregate, water 0.27- 0.45 part.
- 3. backfilling material as claimed in claim 1, it is characterised in that be made up of the raw material of following parts by weight：Portland cement 1.0 parts, 0.15-0.3 parts of flyash, 0.2-0.3 parts of slag micro powder, 0.05-0.1 parts of graphite powder, 0.005-0.01 parts of defoamer, 0.10-0.15 parts of swelling agent, 0.10-0.15 parts of bentonite, 0.010-0.020 parts of water reducer, 2.0-3.0 parts of slag fine aggregate, 0.45-0.60 parts of water.
- 4. the backfilling material as described in claim any one of 1-3, it is characterised in that the portland cement is normal silicate Cement, Portland fly ash cement, portland-pozzolan cement, portland slag cement or composite Portland cement；The silicon Strength grade >=42.5 of acid salt cement.
- 5. the backfilling material as described in claim any one of 1-3, it is characterised in that the specific surface area of the slag micro powder is 350-500kg/m3, 0.08mm tails over percentage composition≤5.0%.
- 6. the backfilling material as described in claim any one of 1-3, it is characterised in that the graphite powder is crystalline graphite powder.
- 7. the backfilling material as described in claim any one of 1-3, it is characterised in that the particle diameter of the slag fine aggregate≤ 1.18mm。
- 8. the backfilling material as described in claim any one of 1-3, it is characterised in that the viscosity of the defoamer is more than 800Pa.s；Or the swelling agent is UEA swelling agents, 7d limited expansion rate >=0.025% in water；Or the bentonite is calcium base or sodium bentonite, expansion capacity >=20ml/g；Or how the water reducer is is or polycarboxylate water-reducer, water-reducing rate >=20%.
- The preparation method of backfilling material 9. a kind of earth source heat pump drills, it is characterised in that including：The additive of cement, flyash, slag micro powder, slag aggregate and powdery is proportionally dry-mixed uniform, add water stirring 2-4min is uniform to slurry, adds liquid additive and stirs 2-4min to uniform, produces；The additive includes：Graphite powder (powdery), bentonite (powdery), defoamer (powdery), swelling agent (powdery), water reducer (powdery or liquid).
- 10. application of the backfilling material in geothermal heat pump air-conditioning system construction described in claim any one of 1-8.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107500672A (en) * | 2017-09-26 | 2017-12-22 | 沈阳建筑大学 | The integrated high heat conduction bend resistance cement-based material and preparation method thereof of floor heating |
| CN107963850A (en) * | 2017-09-14 | 2018-04-27 | 杨智航 | A kind of cracking resistance high heat conduction mortar and its preparation method and application |
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| CN107963850A (en) * | 2017-09-14 | 2018-04-27 | 杨智航 | A kind of cracking resistance high heat conduction mortar and its preparation method and application |
| CN107500672A (en) * | 2017-09-26 | 2017-12-22 | 沈阳建筑大学 | The integrated high heat conduction bend resistance cement-based material and preparation method thereof of floor heating |
| CN107500672B (en) * | 2017-09-26 | 2020-09-11 | 沈阳建筑大学 | High-heat-conductivity bending-resistant cement-based material for floor heating integration and preparation method thereof |
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| CN112759316A (en) * | 2021-01-13 | 2021-05-07 | 中国矿业大学 | Filling material with thermal conductivity and design method thereof |
| CN114482920A (en) * | 2021-12-20 | 2022-05-13 | 中煤地质集团有限公司 | Novel geothermal well transformation method |
| CN114482920B (en) * | 2021-12-20 | 2023-08-15 | 中煤地质集团有限公司 | Novel geothermal well reconstruction method |
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