CN101480814B - Method for preparing cement-based grout and mortar for backfilling earth source heat pump underground penstock - Google Patents
Method for preparing cement-based grout and mortar for backfilling earth source heat pump underground penstock Download PDFInfo
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- CN101480814B CN101480814B CN2009100462419A CN200910046241A CN101480814B CN 101480814 B CN101480814 B CN 101480814B CN 2009100462419 A CN2009100462419 A CN 2009100462419A CN 200910046241 A CN200910046241 A CN 200910046241A CN 101480814 B CN101480814 B CN 101480814B
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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
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00439—Physico-chemical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00465—Heat conducting materials
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a method for preparing cement-based grout and cement-based mortar used for refilling an underground buried pipe of a ground source heat pump. Firstly, high thermal conduction materials are adopted to prepare thermal conduction reinforcing fine aggregates; secondly, special composite admixture is prepared, is specially used as grout and mortar of a concrete-based ground source heat pump, and comprises foam killers, foaming agents and naphthalene-based water reducers; and finally the thermal conduction reinforcing fine aggregates are mixed and stirred with cement, mineral admixture, composite admixture, water and the like to prepare the grout and the mortar for the concrete-based ground source heat pump. The cement-based grout and cement-based mortar used for a ground source heat pump and prepared by the method has good thermal conductance, economy, sufficient durability, relatively low cost of cement mortar and grout materials, safe use, environmental protection, good workability, easy obtaining of components, is commercial dry-mixed mortar with large scale production and controllable quality, and plays the role of promoting the standardization and modularization of the construction of the ground source heap pump.
Description
Technical field
The invention belongs to building energy conservation, the source can utilization, dry powder and mortar, cement-based grouting material field, relate to and prepare the be in the milk method of material mortar of cement based used for geothermal heat pump.
Background technology
Earth source heat pump utilizes earth surface geothermal using resource (dark less than 400m usually) as Cooling and Heat Source, can make full use of regenerative resource and carry out power conversion, is a sustainable development heating air-conditioner system.Geothermal heat exchanger has been realized the preliminary extraction of geothermal energy resources, is the position of most critical in the earth source heat pump.Geothermal heat exchanger is good, anticorrosive with heat conduction, and the material of intensity height and deflection is made ground coupling pipe and imbedded undergroundly, forms the enclosed loop.Heat-conducting fluid (water or antifreezing agent) in the pipe does not contact with soil, and the discharging of heat and extraction are to finish by being embedded in the soil fluid thermal exchange cycles in the pipe-line system.
Grouting is the important link in the ground heat exchanger work progress, promptly finishes in boring, down behind the intact U type pipe, injects grouting material in boring.It is used for strengthening pipe laying and the heat exchange of ground on every side between the pipe laying and the wall of a borehole of ground heat exchanger; Prevent that simultaneously the surface water from passing through boring to underground infiltration, is not subjected to the pollution of face of land pollutant with protection underground water, and prevents the cross pollution between each aquifer.The selection of grouting material and correct grouting construction have important meaning for the performance that guarantees ground heat exchanger.Adopt the bad grouting material of heat conductivility will enlarge markedly the interior thermal resistance of boring, under same condition, cause required boring total length to increase, also mean the increase of system's initial cost and operating cost simultaneously.And effectively grouting material can prevent soil freezing, factor such as shrink, harden impacts the buried tube heat exchanger heat-transfer effect, improve the heat-transfer capability of buried tube heat exchanger, simultaneously also can effectively prevent the adverse effect of underground pollution thing, therefore select suitable grouting material that the performance of earth source heat pump is played an important role pipe laying.
At present, domestic research to grouting material is perfect not enough, though the Ministry of Construction spells out in " the earth source heat pump engineering legislation " of issuing and implementation in 2006: " grouting material should adopt the mixing slurry or the special-purpose grouting material of bentonite and fine sand (or cement); When ground heat exchanger is located in the closely knit or hard ground body, should adopt cement base-material grouting grouting; Grouting material and proportioning thereof should adhere to specification ".But domestic research to grouting material is not at present also carried out basically, and " standard " do not provide alternative grouting material prescription yet; Most of units in charge of construction still adopt local sand as grouting material, cause the ground heat exchanger performance bad.
The rational cement-based grouting material of proportion design has thermal conductivity preferably, economy and enough durability etc., and also cement mortar grouting material cost is relatively low, environmental protection safe in utilization, and workability is better, and its constituent also obtains easily.The cement class grouting material that contains aggregate has advantage than bentonite material aspect a lot, be more suitable in the space of filling between stratum and the U type pipe, and using oarse-grained aggregate in the grouting material also is effective ways that improve its thermal conductivity factor.
Summary of the invention
The invention provides a kind of cement-based grout and mortar that is used for backfilling earth source heat pump underground penstock and preparation method thereof.This mortar has good heat conductivility, improves the heat exchange of subterranean heat exchanger of earth source heat pump, also has good operation, intensity, impermeability and micro-expansibility.
For reaching above purpose, solution of the present invention is:
A kind of preparation method who is used for the cement-based grout and mortar of backfilling earth source heat pump underground penstock, this method comprises:
At first, adopt the material preparation heat conduction of high-termal conductivity to strengthen fine aggregate.
Secondly, preparation specific complex additive, this compound additive is specifically designed to cement based earth source heat pump grout and mortar, comprises defoamer, foaming agent and naphthalene water reducer.
At last, heat conduction being strengthened fine aggregate mixes with cement, mineral additive, compound additive, water to stir and is prepared into cement based used for geothermal heat pump grout and mortar.
Further, fine aggregate is strengthened in described heat conduction: slag crushing is become sand, and dry processing to surperficial gas is done; By mechanical grading slag sand is divided into 1.25～2.5,0.63～1.25,0.315～0.63,0.16～0.315 four different-grain diameter district, mix in proportion the fine aggregate that is formulated as modulus of fineness 2.53 (excursion ± 0.3) again, the particle of fine aggregate is formed must contain above-mentioned all four particle diameter districts, and concrete ratio should be determined by test according to the particle shape feature of used slag sand.
The described method for preparing the specific complex additive may further comprise the steps: will get angry aluminium cream and dispersant of A. mixes by mass ratio at 1: 9, by high-speed stirred the aluminium cream of getting angry is evenly distributed in the dispersant, prepares foaming agent;
B. the foaming agent that steps A is obtained is dry to be handled;
C. foaming agent, defoamer are mixed in 1: 3: 15 ratio of mass ratio with naphthalene water reducer, mix by high-speed stirred;
D. the compound additive that step C is obtained is dry to be handled.
Preparation method's step is: after fine aggregate, mineral additive, the dry mixing evenly of specific complex additive employing mixer are strengthened in cement, heat conduction, add entry and stir 1min at a slow speed, stop to stir 1min, stir 1min more fast, make cement based used for geothermal heat pump grout and mortar
Cement can be 32.5 or 42.5 grades Portland cement or portland cement, and mineral additive is ground slag or flyash, and cement based used for geothermal heat pump grout and mortar component and best in quality proportioning are as follows:
Set of dispense is than (kg/m3)
Cement 700
Mineral additive 100
Fine aggregate 1670 is strengthened in heat conduction
Water 310
Compound additive 3.8
The grout and mortar that the present invention makes is owing to used density big, and the fine aggregate of good heat conductivity has improved heat conductivility, also effectively improves the bulk density of grouting material, better fixing ground heat exchanger.And admixture compound additive, reduce the water consumption of grouting material mix, reduce the porosity in irregular hole, improve the packing of grouting material,, improved the workability and the intensity of used for geothermal heat pump cement-based grout material for grouting material provides certain microdilatancy, reduce bleeding, the sedimentation of grouting material, increase the packing of grouting material, improved the thermal conductance and the durability of grouting material, reduced permeability.Crushed zone, water yield are big, the more high geological conditions of water level to passing through of may existing of earth source heat pump job location simultaneously, having played prevents to hole causes cross pollution between each aquifer, the effect of the water conservancy project performance that the maintaining heat exchange and earth source heat pump time limit projected life are interior.
The specific embodiment
The present invention adopts heat conduction to strengthen the grout and mortar material that preparations such as fine aggregate, cement material, mineral additive and compound additive have the excellent heat conductivity performance, and this method comprises:
At first, fine aggregate is strengthened in preparation heat conduction.
Slag crushing is become sand, and dry processing to surperficial gas is done; By mechanical grading slag sand is divided into 1.25～2.5,0.63～1.25,0.315～0.63,0.16～0.315 four different-grain diameter district, more by a certain percentage, routine ratio as shown in table 1 mixes the fine aggregate that is formulated as modulus of fineness 2.53.
Table 1 fine aggregate mixed proportion
| Particle diameter/mm | Accumulated retained percentage/% |
| 2.5～1.25? | 21? |
| 1.25～0.63? | 30? |
| 0.63～0.315? | 30? |
| 0.315～0.16? | 19? |
Fine aggregate is strengthened in heat conduction both can be separately as the fine aggregate of cement based used for geothermal heat pump grout and mortar, also can mix again with the quartz sand of same grating to be prepared into the fine aggregate use that suitable different heat conductivilitys require.
Secondly, preparation specific complex additive.This compound additive is specifically designed to cement based earth source heat pump grout and mortar, comprise defoamer, foaming agent and naphthalene water reducer, the described ratio of B is mixed the back and is added cement based earth source heat pump grout and mortar set by step, for mortar provides good flowability, and intensity and microdilatancy.This compound method comprises:
A. will get angry aluminium cream and dispersant by mass ratio mixing in 1: 9, and the aluminium cream of getting angry will be evenly distributed in the dispersant, prepare foaming agent by high-speed stirred;
B. the foaming agent that steps A is obtained is dry to be handled;
C. foaming agent, defoamer are mixed in 1: 3: 15 ratio of mass ratio with naphthalene water reducer, mix by high-speed stirred;
D. the compound additive that step C is obtained is dry to be handled.
In step B and D, the drying of foaming agent and compound additive is carried out at normal temperatures, to prevent aluminium cream oxidation deactivation at high temperature.
Then, heat conduction is strengthened fine aggregate and cement, mineral additive, compound additive, water etc. and be prepared into cement based used for geothermal heat pump grout and mortar.
Above-mentioned cement material can be selected 32.5 or 42.5 grades of portland cements or Portland cement.Mineral additive is ground slag or flyash.
Above-mentioned cement based earth source heat pump grout and mortar is a kind of composition, for obtaining better comprehensive performance, can adopt component shown in the following table 2 and best in quality proportioning:
The best proportioning of table 2 cement based earth source heat pump grout and mortar
| Component | Proportioning (kg/m 3)? |
| Cement | 700? |
| Mineral additive | 100? |
| Fine aggregate is strengthened in heat conduction | 1670? |
| Water | 310? |
| Compound additive | 3.8? |
Wherein heat conduction reinforcement fine aggregate can substitute with identical grating quartz sand equal-volume according to actual needs.The preparation method after cement, mineral additive, fine aggregate, compound additive are adopted mixer dry mixing evenly, adds entry and stirs 1min at a slow speed, stops to stir 1min, stirs 1min more fast, makes cement based used for geothermal heat pump grout and mortar.Adjust heat conduction and strengthen the different proportion of fine aggregate in fine aggregate, can realize the variation of the thermal conductivity factor of cement based used for geothermal heat pump grout and mortar.
Be described in further detail below in conjunction with example:
Example one:
With the shrend slag in the slag crushing machine, be crushed to 90% particle diameter less than 5mm after, the dry processing to surperficial gas done.By mechanical grading slag sand is divided into 1.25～2.5,0.63～1.25,0.315～0.63,0.16～0.315 four different-grain diameter district mixes the fine aggregate that is formulated as modulus of fineness 2.53 in aforementioned table 1 ratio again.
To get angry aluminium cream and dispersant mixes by mass ratio 1: 9 (error be no more than ± 1%), by high-speed stirred the aluminium cream of getting angry is evenly distributed in the dispersant, prepares foaming agent.Dispersant should be selected alkalescent or neutrality for use, not the kind of moisture-sensitive; Aluminium cream resting period of getting angry must not surpass a week, to avoid oxidation deactivation in air.The foaming agent that preparation is finished is put into the air drying case and is placed 24h.
Dried foaming agent and defoamer, naphthalene water reducer are mixed in the ratio of mass ratio 1: 3: 15 (error be no more than ± 1%), mix by high-speed stirred.The compound additive that preparation is finished is put into the air drying case and is placed 24h.
Select for use 42.5 portland cements and I level ground slag as Binder Materials, cement, mineral additive, fine aggregate, compound additive mix according to mass ratio shown in the aforementioned table 2, after cement, fine aggregate, mineral additive and the dry mixing evenly of compound additive employing planetary stirring machine, add entry and stir 1min (error is no more than 10 seconds) at a slow speed, stop to stir 1min (error is no more than 10 seconds), stir 1min (error is no more than 10 seconds) more fast, make the used for geothermal heat pump cement-based grout and mortar.The novel concrete base grouting material has thermal conductivity preferably, workability and enough durability etc., and its performance indications see Table 3.
Table 3 is joined used for geothermal heat pump cement-based grout and mortar performance
Example two:
With the shrend slag in the slag crushing machine, be crushed to 90% particle diameter less than 5mm after, the dry processing to surperficial gas done.By mechanical grading slag sand is divided into 1.25～2.5,0.63～1.25,0.315～0.63,0.16～0.315 four different-grain diameter district mixes the fine aggregate that is formulated as modulus of fineness 2.53 in aforementioned table 1 ratio again.
Again fine aggregate being strengthened in the heat conduction of preparation mixes by 1: 1 with the quartz sand of identical modulus of fineness.
To get angry aluminium cream and dispersant by mass ratio mixing in 1: 9, the aluminium cream of getting angry is evenly distributed in the dispersant, prepare foaming agent by high-speed stirred.Dispersant should be selected alkalescent or neutrality for use, not the kind of moisture-sensitive; Aluminium cream resting period of getting angry must not surpass a week, to avoid oxidation deactivation in air.The foaming agent that preparation is finished is put into the air drying case and is placed 24h.
Dried foaming agent is mixed in 1: 3: 15 ratio of mass ratio with defoamer, naphthalene water reducer, mix by high-speed stirred.The compound additive that preparation is finished is put into the air drying case and is placed 24h.
Select for use 42.5 portland cements and I level ground slag as Binder Materials, cement, mineral additive, mixing fine aggregate, compound additive mix according to mass ratio shown in the aforementioned table 2, after cement, mixing fine aggregate, mineral additive and the dry mixing evenly of compound additive employing planetary stirring machine, add entry and stir 1min at a slow speed, stop to stir 1min, stir 1min more fast, make the used for geothermal heat pump cement-based grout and mortar.The novel concrete base grouting material has thermal conductivity preferably, workability and enough durability etc., and its performance indications see Table 3.
Table 3 is joined used for geothermal heat pump cement-based grout and mortar performance
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (5)
1. the preparation method of a cement based used for geothermal heat pump grout and mortar is characterized in that: comprising:
At first, adopt the material preparation heat conduction of high-termal conductivity to strengthen fine aggregate;
Secondly, preparation specific complex additive comprises defoamer, foaming agent and naphthalene water reducer;
At last, fine aggregate is strengthened in heat conduction is mixed with cement, mineral additive, specific complex additive, water to stir and be prepared into cement based used for geothermal heat pump grout and mortar,
The material of described high-termal conductivity is a slag,
The preparation method of described specific complex additive may further comprise the steps: will get angry aluminium cream and dispersant of A. mixes by mass ratio at 1: 9, by high-speed stirred the aluminium cream of getting angry is evenly distributed in the dispersant, prepares foaming agent;
B. the foaming agent that steps A is obtained is dry to be handled;
C. foaming agent, defoamer are mixed in 1: 3: 15 ratio of mass ratio with naphthalene water reducer, mix by high-speed stirred;
D. the specific complex additive that step C is obtained is dry to be handled,
Described heat conduction is strengthened fine aggregate and made by following steps: slag crushing is become sand, and dry processing to surperficial gas is done; By mechanical grading slag sand is divided into 1.25～2.5mm, 0.63～1.25mm, four different-grain diameter districts of 0.315～0.63mm, 0.16～0.315mm, mix in proportion the fine aggregate that is formulated as modulus of fineness 2.50～2.56 again, the particle composition of fine aggregate is contained above-mentioned all four particle diameter districts.
2. preparation method according to claim 1, it is characterized in that: fine aggregate is strengthened in heat conduction mixed with cement, mineral additive, specific complex additive, water and stir the concrete steps be prepared into cement based used for geothermal heat pump grout and mortar and be, after cement, heat conduction reinforcement fine aggregate, mineral additive, the dry mixing evenly of specific complex additive employing mixer, add entry and stir 1min at a slow speed, stop to stir 1min, stir 1min more fast, make cement based used for geothermal heat pump grout and mortar.
3. preparation method according to claim 2 is characterized in that: described cement is to be selected from 32.5 or 42.5 grades Portland cement or portland cement, and mineral additive is ground slag or flyash.
4. preparation method according to claim 2 is characterized in that: described cement based used for geothermal heat pump grout and mortar component and quality proportioning are as follows:
Set of dispense is than (kg/m3)
Cement 700
Mineral additive 100
Fine aggregate 1670 is strengthened in heat conduction
Water 310
Specific complex additive 3.8.
5. preparation method according to claim 1 is characterized in that: the particle of described fine aggregate is composed as follows:
Particle diameter/mm accumulated retained percentage/%
2.5～1.25 21
1.25～0.63 30
0.63～0.315 30
0.315～0.16 19。
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| CN2009100462419A CN101480814B (en) | 2009-02-17 | 2009-02-17 | Method for preparing cement-based grout and mortar for backfilling earth source heat pump underground penstock |
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| CN2009100462419A CN101480814B (en) | 2009-02-17 | 2009-02-17 | Method for preparing cement-based grout and mortar for backfilling earth source heat pump underground penstock |
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| CN101480814B true CN101480814B (en) | 2011-03-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104514218A (en) * | 2013-09-30 | 2015-04-15 | 清华大学 | Energy pile and system thereof |
| CN104402349A (en) * | 2014-10-23 | 2015-03-11 | 山东建筑大学 | Ground-source heat pump ground-buried pipe backfill material and preparation method thereof |
| CN105174860A (en) * | 2015-08-21 | 2015-12-23 | 徐德龙 | High thermal conductive cementing material capable of enhancing heat exchange performance of heat exchange system of floor heating |
| CN106810181B (en) * | 2017-02-09 | 2022-06-21 | 北京派诺蒙能源科技有限公司 | Heat transfer cement-based grouting material |
| CN106866081B (en) * | 2017-04-07 | 2019-04-19 | 山东建筑大学 | A kind of preparation method of earth source heat pump drilling backfilling material |
| CN107963850B (en) * | 2017-09-14 | 2021-06-15 | 杨智航 | Anti-cracking high-thermal-conductivity mortar and preparation method and application thereof |
| CN112299783A (en) * | 2020-10-30 | 2021-02-02 | 上海二十冶建设有限公司 | Spliced pier sleeve grouting material and preparation method thereof |
| CN112321229A (en) * | 2020-10-30 | 2021-02-05 | 上海二十冶建设有限公司 | Sleeve grouting material for prefabricated house and preparation method thereof |
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