CN112608053A - Modified aggregate, preparation method and concrete using modified aggregate - Google Patents
Modified aggregate, preparation method and concrete using modified aggregate Download PDFInfo
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- CN112608053A CN112608053A CN202011504717.1A CN202011504717A CN112608053A CN 112608053 A CN112608053 A CN 112608053A CN 202011504717 A CN202011504717 A CN 202011504717A CN 112608053 A CN112608053 A CN 112608053A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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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
- 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
- C04B14/04—Silica-rich materials; Silicates
- C04B14/14—Minerals of vulcanic origin
- C04B14/16—Minerals of vulcanic origin porous, e.g. pumice
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
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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
- 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
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
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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
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of concrete, in particular to a modified aggregate, a preparation method and concrete using the same. The modified aggregate comprises aggregate and an ionic liquid phase-change energy-storage modifier, wherein the ionic liquid phase-change energy-storage modifier is positioned in pores on the surface of the aggregate; the ionic liquid-like phase change energy storage modifier comprises ionic liquid with the phase change temperature ranging from 20 ℃ to 38 ℃. When prepared, the method comprises the following steps: dipping: immersing the aggregate in the liquid-like ionic liquid phase-change energy-storage modifier so that the ionic liquid phase-change energy-storage modifier enters gaps of the aggregate, taking out the aggregate and cooling the aggregate to a saturated surface dry state; wrapping pulp: and coating the surface of the aggregate in a saturated surface dry state with the cement-based slurry to form a shell, thus preparing the modified aggregate. The concrete prepared from the modified aggregate has a good heat preservation and energy storage effect, and the strength of a concrete product prepared from the modified aggregate is good.
Description
Technical Field
The application relates to the field of concrete, in particular to a modified aggregate, a preparation method and concrete using the same.
Background
With the continuous acceleration of urbanization construction in China, high-rise buildings and super high-rise buildings gradually become mainstream buildings. More and more high-rise buildings not only require that building concrete has lower volume weight, higher specific heat capacity than common materials and excellent heat preservation and storage capacity, but also have low cost and low energy loss.
After the building concrete has certain heat preservation and storage capacity, the wall plate or the roof made of the building concrete can have certain heat preservation and insulation effects on buildings, so that a house has certain effects of being warm in winter and cool in summer. When the outdoor supercooling type heat preservation device is used outdoors, the heat transfer between the indoor space and the outdoor space can be slowed down, so that the heat transferred to the outdoor space indoors is less than that of common concrete, the indoor space has higher temperature, a certain heat preservation effect is achieved, energy can be saved, and the use of heating appliances is reduced. When the building concrete is overheated outdoors, the heat can be reduced to enter the room, the indoor temperature is cool, the use of refrigeration appliances can be reduced, and the building concrete has certain building energy-saving effect to a certain extent when the heat preservation and storage capacity of the building concrete is good.
At present, the research on building energy conservation is relatively late in China, and in the currently known materials, the heat preservation and heat storage capacity of the phase change energy storage material is relatively good, but the phase change energy storage building material for realizing building energy conservation still stays at an exploratory stage, and most scientific research institutions mainly focus on the research on some self physicochemical properties of the phase change material. And the existing research results of the phase change energy storage material also do not obtain large-scale application and industrial production in buildings due to the problems of durability, economy, energy storage performance and the like. For example, at present, liquid paraffin and solid paraffin are used for modifying aggregate to improve the heat preservation and heat storage capacity of the aggregate, but the prepared concrete has insufficient heat preservation and heat storage capacity and cannot meet the higher heat preservation and heat storage requirements.
Therefore, the inventor believes that a concrete with better heat preservation and storage capacity is needed at present.
Disclosure of Invention
In order to obtain concrete with better heat preservation and storage capacity, the application provides modified aggregate, a preparation method and concrete using the modified aggregate.
In a first aspect, the invention provides a modified aggregate, which adopts the following technical scheme:
a modified aggregate comprises an aggregate and an ionic liquid-like phase-change energy-storage modifier, wherein the ionic liquid-like phase-change energy-storage modifier is positioned in pores on the surface of the aggregate;
the ionic liquid-like phase change energy storage modifier comprises ionic liquid with the phase change temperature ranging from 20 ℃ to 38 ℃.
By adopting the technical scheme, the aggregate is modified by adopting the ion-like liquid with the phase transition temperature of 20-38 ℃, so that the ion-like liquid is filled in the pores on the surface of the aggregate. When the temperature of the aggregate is lower than 20 ℃, the ion-like liquid is in a solid state, and when the temperature of the aggregate is higher than 38 ℃, the ion-like liquid is in a viscous state, and in the phase change temperature range, the ion-like liquid absorbs or releases heat to carry out phase change, so that in the process, the heat passing through the aggregate can be reduced, and the heat conduction is reduced. When the aggregate is modified by the ionic liquid-like modifier, the modified aggregate has better heat preservation and storage capacity, so that the concrete using the modified aggregate also has better heat preservation and storage capacity.
In addition, the ionic liquid is simple in the synthesis process, green and environment-friendly, and accords with the theme of current green and environment-friendly energy-saving buildings. Wherein, the ionic liquid can comprise choline ionic liquid, imidazole ionic liquid or pyrrole ionic liquid. For example, choline chloride ionic liquid, imidazole bromide ionic liquid, or pyrrolidone ionic liquid.
Preferably, the ionic liquid-like phase change energy storage modifier is choline chloride ionic liquid.
By adopting the technical scheme, the choline chloride ionic liquid is used as the phase-change energy-storage modifier of the ionic liquid, so that the prepared aggregate has better heat preservation and heat storage capacity, and the cost is cheap and easy to obtain compared with other ionic liquids. In practical application, mass production can be carried out.
Preferably, the ionic liquid-like phase change energy storage modifier also comprises alcohols with the phase change temperature range of 20-38 ℃.
By adopting the technical scheme, the alcohol with the phase-change temperature range of 20-38 ℃ is added, the alcohol and the ionic liquid can be mixed to form a blended mixture, the phase-change temperature of the blended mixture is a certain value in the middle range of the phase-change temperatures of the alcohol and the ionic liquid, the ratio of the alcohol and the ionic liquid is determined according to the ratio of the alcohol and the ionic liquid, and the phase-change temperature of the ionic liquid phase-change energy storage modifier can be adjusted according to actual conditions so as to meet the requirements of concrete in different regions. In addition, the cost of the alcohols is low, and the alcohols are convenient for large-scale production.
Preferably, the alcohol is polyethylene glycol, and the polymerization degree of the alcohol is 600-1000;
the weight ratio range of the choline chloride ionic liquid to the polyethylene glycol is as follows: 1: (0.5-4).
By adopting the technical scheme, the polyethylene glycol with the polymerization degree of 600-1000 is selected and is sticky at room temperature, so that the polyethylene glycol can be conveniently mixed with the ionic liquid. When the weight ratio of the choline chloride to the polyethylene glycol is in the range of: 1: (0.5-4), the phase-change temperature of the prepared ionic liquid-like phase-change energy-storage modifier is 20-38 ℃. The concrete prepared by using the modified aggregate has better heat preservation and storage capacity. In addition, the production cost is low, and the method is suitable for practical production.
Preferably, the weight ratio of choline chloride to polyethylene glycol is: 1: 4.
by adopting the technical scheme, when the weight ratio of choline chloride to polyethylene glycol is as follows: when the ratio is 1:4, the phase change temperature of the prepared ionic liquid-like phase change energy storage modifier is 38 ℃, the heat preservation and storage effects are good, and the strength is good. In addition, the phase-change temperature of the ionic liquid-like phase-change energy-storage modifier is 38 ℃, so that the temperature is suitable for the comfortable temperature of a human body, and the indoor temperature can be kept at a suitable temperature.
Preferably, the ionic liquid-like phase change energy storage modifier is prepared by adopting the following technical scheme:
the method comprises the following steps: heating and stirring the ionic compound to liquid to form liquid ionic liquid;
step two: and (3) adding alcohols into the liquid ionic liquid prepared in the step one, continuously heating until the alcohols are completely dissolved, and then cooling to room temperature to obtain the solid ionic liquid phase-change energy storage modifier.
By adopting the technical scheme, when the phase-change energy-storage modifier of the ionic liquid is prepared, the ionic compound can be heated and stirred to form uniform liquid. Then, when alcohol is needed to be added to change the phase change temperature of the mixture, the alcohol can be added into the ionic liquid, and the ionic liquid and the alcohol are uniformly mixed to prepare the ionic liquid phase change energy storage modifier. The preparation method is simple.
Preferably, the ionic liquid-like phase change energy storage modifier is prepared by adopting the following technical scheme:
the method comprises the following steps: heating choline chloride and stirring to liquid at 50-70 ℃ to form liquid ionic liquid;
step two: and (3) adding polyethylene glycol into the choline chloride ionic liquid prepared in the step one, heating to be completely dissolved, wherein the heating temperature is 50-60 ℃, and cooling to room temperature to obtain the solid ionic liquid-like phase change energy storage modifier.
By adopting the technical scheme, in the preparation of the ionic liquid-like phase-change energy-storage modifier, choline chloride can be heated to 50-70 ℃ to form liquid ionic liquid, then polyethylene glycol is added and continuously heated to be mixed and dissolved, and the liquid ionic liquid-like phase-change energy-storage modifier is formed. For the convenience of storage, the ionic liquid-like phase-change energy storage modifier can be cooled to room temperature to obtain a solid ionic liquid-like phase-change energy storage modifier. In use, the ionic liquid phase change energy storage modifier may be caused to become liquid by heating.
Preferably, the aggregate is one of recycled brick slag, ceramsite or pumice.
By adopting the technical scheme, the aggregate can be any one of the recycled brick slag, the ceramsite or the pumice, and the surface of the aggregate has larger and more pores, so that the aggregate has better function of adsorbing the ionic liquid phase-change energy storage modifier, and the heat insulation effect of the aggregate is improved to a greater extent
Preferably, the aggregate is recycled brick slag, and the particle size range is 5-20 mm.
Through adopting above-mentioned technical scheme, adopt the recycled brick sediment, compare in other aggregates, comparatively green, and the space that its surface has is more, can absorb more class ionic liquid phase change energy storage modifier for the aggregate has better heat preservation heat-retaining ability. The grain diameter is selected to be 5-20mm, which can ensure that the aggregate and other substances in the concrete are mixed better.
In a second aspect, the present application provides a method for preparing a modified aggregate, which adopts the following technical scheme:
dipping: immersing the aggregate in a liquid-state ionic liquid phase-change energy-storage modifier so that the ionic liquid phase-change energy-storage modifier enters gaps of the aggregate, taking out the aggregate and cooling the aggregate to a saturated surface dry state;
wrapping pulp: and coating the surface of the aggregate in a saturated surface dry state with the cement-based slurry to form a shell, thus preparing the modified aggregate.
By adopting the technical scheme, when the modified aggregate is prepared, the aggregate is immersed in the ionic liquid-like phase-change energy storage modifier, so that the ionic liquid-like phase-change energy storage modifier can be fully adsorbed by the pores on the surface of the aggregate. After the aggregate is taken out, the phase change energy storage modifier of the ionic liquid can be solidified in the pores of the aggregate and cannot be separated due to the reduction of the external temperature. At the moment, the aggregate is wrapped by the slurry, the cement-based slurry can form a layer of shell on the surface of the aggregate, and the ionic liquid-like phase change energy storage modifier is effectively prevented from being separated from the aggregate when the phase change is liquid, so that the heat preservation and storage capacity of the aggregate is better under the condition of long-time use.
Preferably, in the impregnation step, the impregnation temperature is 40-60 ℃ and the immersion time is 20-48 h.
By adopting the technical scheme, in the dipping step, the dipping temperature is 40-60 ℃, so that the ionic liquid-like phase-change energy-storage modifier is in a liquid state, the absorption of aggregate is facilitated, the immersion time is 20-48h, and the aggregate can fully absorb the ionic liquid-like phase-change energy-storage modifier.
Preferably, in the pulp wrapping step, the thickness of the outer shell is 0.1 to 0.5 mm.
By adopting the technical scheme, the thickness of the shell is 0.1-0.5mm, if the shell is too thick, the later strength of the concrete is improved, and if the shell is too thin, the ionic liquid-like phase change energy storage modifier is easy to permeate to the outside from the shell, so that the heat preservation and storage effects are reduced.
Preferably, in the slurry coating step, the weight ratio of the cement slurry to the aggregate is 1: 4.
By adopting the technical scheme, when the weight ratio of the cement paste to the aggregate is 1:4, the thickness of the shell wrapped by the cement paste is moderate.
Preferably, in the coating step, the cement slurry is formed by mixing portland cement and water in a weight ratio of 1: 0.48.
By adopting the technical scheme, when the Portland cement and the water are mixed in a ratio of 1:0.48, the thickness of the cement paste is moderate, and the wrapping effect is good.
In a third aspect, the present application provides a concrete, which adopts the following technical scheme:
the concrete is prepared from the following raw materials in parts by weight:
305-332 parts of cement;
280-320 parts of stone chips;
250-350 parts of sand;
120-180 parts of modified aggregate.
By adopting the technical scheme, the prepared concrete has better heat preservation performance because the prepared concrete contains the modified aggregate, and the modified aggregate can be mixed with stone chips, sand and the like, so that the strength of the concrete is improved.
Preferably, the modified aggregate may include a portion of unmodified aggregate.
By adopting the technical scheme, the unmodified aggregate can be added according to actual needs on the premise of reaching the standard of the heat preservation effect, so that the cost can be reduced, and the unmodified aggregate can be regenerated brick slag, regenerated gravel, ceramsite or pumice and the like.
Preferably, the concrete further comprises an additive, and the weight part of the additive can be 1-5 parts.
By adopting the technical scheme, corresponding additives can be added into concrete according to different applications and requirements, such as: water reducing agent, reinforcing agent, retarder, flame retardant, antibacterial agent, antifreezing agent, anti-permeability agent, plasticizer, early strength agent, accelerator, air entraining agent, pumping agent, expanding agent, colorant, waterproofing agent, moisture-proof agent, rust inhibitor and the like.
Preferably, the concrete further comprises a water reducing agent, and the weight part of the water reducing agent is 1.5-2.1.
By adopting the technical scheme, after the water reducing agent is added, the addition amount of water can be reduced, the hydration heat can be reduced, and the strength of the concrete can be improved in the process of mixing the concrete and the water.
Preferably, the concrete is prepared from the following raw materials in parts by weight:
313 parts of cement;
300 parts of stone chips;
300 parts of sand;
150 parts of modified aggregate;
1.5 parts of a water reducing agent.
By adopting the technical scheme, the concrete prepared by the formula has a good heat preservation effect.
Preferably, the sand is water sand.
By adopting the technical scheme, the sand can be water sand, river sand or graded sand and the like, wherein the water sand is added into the concrete, the cost is lower, and the strength of the concrete is better.
Preferably, a concrete is prepared by the following steps:
preliminary mixing: mixing the silicate cement paste with the modified aggregate, and uniformly stirring to prepare a mixture;
and (3) complete mixing: and adding the sand, the stone chips and the water reducing agent into the mixture, stirring, and obtaining the concrete after stirring.
By adopting the technical scheme, in the process of preparing concrete, the powder and the modified aggregate are mixed firstly, and after the powder and the modified aggregate are mixed uniformly, substances such as sand, stone chips and the like are added into the powder for stirring, so that the substances are mixed more uniformly.
In summary, the present application has the following beneficial effects:
1. because the ionic liquid is used as the modifier, and the phase change temperature is 20-38 ℃, the modifier in the aggregate can be subjected to phase change to absorb or release heat at the phase change temperature after the aggregate is modified, so that the concrete has better heat preservation and heat storage effects.
2. In the application, the aggregate is modified by preferably adopting a method of coating slurry after impregnation, so that the gap of the aggregate is filled with the modifier, and in the phase change process, the shell can reduce the separation of the ionic liquid-like phase change energy storage modifier and the aggregate, thereby increasing the heat preservation and heat storage effects of the aggregate.
3. According to the application, choline chloride-polyethylene glycol are adopted to form inorganic-organic ionic liquid as the ionic liquid phase change energy storage modifier, the cost is low, and the modified aggregate is applied to concrete, so that the heat preservation and storage effects of the concrete are good.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following preparation examples, examples and application examples, the respective raw materials are commercially available, and some of the raw materials may be selected from those shown in table 1 below.
Table 1: source table of each raw material
Examples of preparation of raw materials and/or intermediates
Preparation example 1
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of choline chloride in a reaction kettle, heating and stirring at 60 ℃ until colorless and transparent liquid is generated, stopping heating, and standing the solution to room temperature to obtain the ionic liquid-like phase change energy storage modifier.
Preparation example 2
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of pyrrolidone in a reaction kettle, heating and stirring at 60 ℃ until liquid is generated, stopping heating, and standing the solution to room temperature to obtain the ionic liquid-like phase change energy storage modifier.
Preparation example 3
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of 1-butyl-3-methyl imidazole bromide in a reaction kettle, heating and stirring at 70 ℃ until liquid is generated, stopping heating, and standing the solution to room temperature to obtain the ionic liquid-like phase change energy storage modifier.
Preparation example 4
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of choline chloride in a reaction kettle, heating and stirring at 60 ℃ until colorless and transparent liquid is generated;
weighing 50kg of cyclohexanol in the reaction kettle, continuously heating and stirring at the heating temperature of 60 ℃ until the cyclohexanol is completely mixed with choline chloride;
stopping heating, and standing the solution to room temperature to obtain the solid ionic liquid-like phase change energy storage modifier.
Preparation example 5
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of choline chloride in a reaction kettle, heating and stirring at 60 ℃ until colorless and transparent liquid is generated;
weighing 50kg of polyethylene glycol with polymerization degree of 1000 in the reaction kettle, continuously heating and stirring, wherein the heating temperature is 50 ℃, and completely dissolving the polyethylene glycol;
stopping heating, and standing the solution to room temperature to obtain the ionic liquid-like phase change energy storage modifier.
Preparation example 6
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of choline chloride in a reaction kettle, heating and stirring at 60 ℃ until colorless and transparent liquid is generated;
weighing 25kg of polyethylene glycol with the polymerization degree of 800 in the reaction kettle, continuously heating and stirring at the heating temperature of 60 ℃ until the polyethylene glycol is completely dissolved;
stopping heating, and standing the solution to room temperature to obtain the ionic liquid-like phase change energy storage modifier.
Preparation example 7
An ionic liquid-like phase change energy storage modifier is prepared by the following method:
weighing 50kg of choline chloride in a reaction kettle, heating and stirring at 60 ℃ until colorless and transparent liquid is generated; weighing 200kg of polyethylene glycol sample with the polymerization degree of 800 in the reaction kettle, continuously heating and stirring at the heating temperature of 60 ℃ until the polyethylene glycol is completely dissolved;
stopping heating, and standing the solution to room temperature to obtain the ionic liquid-like phase change energy storage modifier.
Examples
Example 1
A modified aggregate is prepared by the following method:
dipping: heating the ionic liquid-like phase-change energy storage modifier prepared in the preparation example 1 to enable the ionic liquid-like phase-change energy storage modifier to be in a liquid state, and then immersing 1kg of regenerated brick slag into the ionic liquid-like phase-change energy storage modifier at the immersion temperature of 50 ℃ for 24h to enable the ionic liquid-like phase-change energy storage modifier to be adsorbed in gaps of the regenerated brick slag. Taking out the recycled brick slag, and cooling the recycled brick slag to a saturated surface dry state, namely the recycled brick slag has saturated internal pore liquid content and dry surface. At the moment, the phase-change energy-storage modifier of the ionic liquid is changed into a solid state in the gap of the regenerated brick slag.
Wrapping pulp: uniformly mixing silicate cement and water in a weight ratio of 1:0.48 in a stirrer to form 0.25kg of cement paste, pouring the impregnated recycled brick slag into the cement paste, uniformly stirring to disperse the recycled brick slag, taking out the recycled brick slag, forming a layer of cement shell on the surface of the recycled brick slag, wherein the average thickness of the shell is 0.1mm, and thus obtaining the modified aggregate.
Examples 2 to 7
A modified aggregate differing from example 1 in that: the phase change energy storage modifiers of the ionic liquid prepared in preparation examples 2-7 are respectively selected.
Example 8
A modified aggregate differing from example 6 in that: and replacing the regenerated brick slag with ceramsite.
Example 9
A modified aggregate differing from example 6 in that: and replacing the recycled brick slag with pumice.
Application example
Application example 1
The concrete is prepared from the following raw materials in parts by weight as shown in Table 2:
preliminary mixing: mixing the Portland cement with the modified aggregate prepared in the example 1, and uniformly stirring to prepare a mixture;
and (3) complete mixing: and adding the water sand, the stone chips and the water reducing agent into the mixture, stirring, and obtaining the concrete after stirring.
Application example 10
A concrete which is different from the concrete of application example 7 in that: the weight of each component is shown in table 2.
Application example 11
A concrete which is different from the concrete of application example 7 in that: the weight of each component is shown in table 2.
Application example 12
A concrete which is different from the concrete of application example 7 in that: the weight of each component is shown in table 2.
Comparative example 1
A modified aggregate is prepared by the following method:
dipping: mixing liquid paraffin and solid paraffin according to the proportion of 1: 1, raising the temperature to 60 ℃, immersing 150kg of ceramsite in the mixed solution, and keeping the temperature for 24 hours. Taking out and cooling.
Wrapping pulp: heating 300 kg of epoxy resin to 80 ℃, adding the impregnated aggregate into the epoxy resin, uniformly stirring, and taking out to form a layer of epoxy resin shell to obtain the modified aggregate.
Comparative example 2
A modified aggregate is prepared by the following method:
dipping: 150kg of the recycled brick slag is immersed in the ionic liquid-like phase-change energy storage modifier prepared in the preparation example 1, the immersion temperature is 60 ℃, and the immersion time is 24 hours, so that the ionic liquid-like phase-change energy storage modifier enters gaps of aggregates. Taking out and cooling to a saturated surface dry state to obtain the modified aggregate.
Wherein the aggregate is recycled brick slag.
Comparative application example 1
The concrete is prepared from the following raw materials in parts by weight as shown in Table 2:
preliminary mixing: mixing the portland cement and the recycled brick slag, and uniformly stirring to prepare a mixture;
and (3) complete mixing: and adding the sand, the stone chips and the water reducing agent into the mixture, stirring, and obtaining the concrete after stirring.
Comparative application example 2
The difference from application example 1 was that the modified aggregate prepared in comparative example 1 was used.
Comparative application example 3
The difference from application example 1 was that the modified aggregate prepared in comparative example 2 was used.
Table 2: raw material table of each application example
Performance test
Detection method/test method
And (4) testing the compressive strength and the heat preservation performance of the aerated concrete block sold in the market.
The concrete prepared in application examples 1-12 and comparative application examples 1-3 is poured to form a concrete block with the size of 100 multiplied by 100mm, and the concrete block is tested for various performances as follows:
1. and (3) testing the compressive strength: the concrete blocks prepared in application examples 1-12 and comparative application examples 1-3 were tested for compressive strength according to the test method in the test standard GB/T50081-2002 Standard for mechanical Properties test methods for ordinary concrete, and the test data are shown in Table 3.
2. Testing the heat preservation performance: the performance is tested according to the test method of GB/T10294-2008 ' determination of steady-state thermal resistance of heat-insulating material and related characteristics ' hot plate protection method '. The concrete blocks prepared in application examples 1 to 12 and comparative application examples 1 to 3 were tested for thermal conductivity, and the test data are shown in table 3.
Table 3: each item of test data
It can be seen from the combination of application examples 1 to 7 and comparative application example 1 and the combination of table 3 that, after the aggregate is modified by the ionic liquid, although the compressive strength of the concrete is reduced to a certain extent, the prepared concrete has better heat preservation performance, the thermal conductivity coefficient is lower than 0.726W/(m.K), and the heat insulation effect is better compared with that of the common concrete.
It can be seen from the combination of application example 9 and comparative application example 2 and the combination of table 3 that when paraffin and liquid paraffin are used as the phase change material in concrete, an epoxy resin layer needs to be wrapped on the phase change material, the compressive strength of the concrete is reduced more, and the thermal conductivity coefficient of the concrete is not ideal enough, which indicates that after the aggregate is modified by the ionic-like liquid in the application, the thermal insulation performance of the concrete is better, and the strength of the concrete is higher than that of comparative application example 2.
It can be seen by combining application example 7 and comparative application example 3 with table 3 that the modified aggregate is not wrapped by the cement-based shell in the process of preparing the modified aggregate, and the prepared concrete product also has a certain heat insulation effect.
As can be seen from application examples 1, 4, 5 to 7 and table 3, the concrete prepared by modifying the aggregate with choline chloride-based ionic liquid or choline chloride-alcohol composite ionic liquid has a good heat insulation effect, and in addition, the concrete prepared by modifying the aggregate with choline chloride-polyethylene glycol composite ionic liquid has a small decrease in strength and satisfies the application range of concrete strength. And when the weight ratio of the choline chloride to the polyethylene glycol is 1:4, the concrete has the best heat insulation effect.
By combining application examples 1-3 with table 3, it can be seen that the concrete prepared from the modified aggregate has a good heat insulation effect by modifying the aggregate with choline chloride, pyrrole and imidazole ionic liquids as modifiers.
Combining application examples 6, 8-9 and table 3, it can be seen that the adoption of ceramsite, pumice and recycled brick slag can make the voids of the aggregate adsorb more ionic liquid-like modifier to improve the heat preservation effect of the concrete product, but the recycled brick slag has the best heat insulation effect after being modified, and then the pumice is modified, and finally the ceramsite is modified. In addition, the recycled brick slag is more environment-friendly, and the cost can be effectively reduced.
Combining application examples 7 and 12 with table 3, it can be seen that when a part of the aggregates is unmodified aggregates and the rest is modified aggregates, compared with the aggregates which are completely modified, the aggregates have slightly poor heat insulation performance, but the compressive strength is improved, so that the aggregates can be adapted according to actual requirements to meet different building requirements.
By combining application examples 5-7 with table 3, it can be seen that when the weight ratio of choline chloride to polyethylene glycol is 1:4, the prepared concrete product has good heat preservation and insulation effects, can save energy and protect environment in the actual building process, and is suitable for human life.
By combining the application examples 1-7 with aerated concrete and table 3, it can be seen that the concrete prepared in the application has slightly poorer heat conductivity coefficient than the aerated concrete, but the strength of the concrete is higher than that of the aerated concrete. When the concrete with higher required strength and better heat preservation and insulation effect is used, the concrete in the application can be selected.
In addition, when the concrete prepared in the application is made into a roof or a wall of a building, if the outdoor temperature is higher than the phase transition temperature of the ionic liquid-like modifier, the ionic liquid-like modifier in the concrete absorbs heat to perform phase transition and changes from a solid state into a viscous liquid state, and in the process, the ionic liquid-like modifier absorbs a large amount of outdoor heat, so that the outdoor heat is less to enter the room, and the heat insulation effect is achieved. And in the process, the ionic liquid-like modifier stores heat. If the room temperature is gradually lower than the phase transition temperature of the ionic liquid-like modifier, the ionic liquid-like modifier in the concrete releases heat to perform phase transition at the moment, and the ionic liquid-like modifier is changed from a viscous liquid phase to a solid phase. The concrete prepared in the application is adopted to manufacture the building, the effect of being warm in winter and cool in summer can be achieved, in addition, in the building, the use of warm air and cold air electrical appliances can be reduced, and the energy-saving core of a green building is met.
The market unit price of the existing choline chloride is about 55 yuan/kg, the unit price of the polyethylene glycol is about 36 yuan/kg, and the unit price of the regenerated brick slag is about 0.04 yuan/kg. In 1 cubic meter of concrete, on average, about 864g of choline chloride and about 3.456kg of polyethylene glycol were used. The weight of the recycled brick slag is about 550kg on average. With the remainder of the material, the average price of 1 cubic meter of concrete is about 350-550 dollars. The price of 1 cubic meter of the common commercial heat-insulating wallboard is about 500 plus 700 yuan, so that the recycled aggregate is modified by combining choline chloride and polyethylene glycol to prepare the obtained concrete, the cost is low, and the heat-insulating effect is good. Can be widely applied in actual production, and has higher commercial value.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A modified aggregate is characterized by comprising an aggregate and an ionic liquid phase-change energy-storage modifier, wherein the ionic liquid phase-change energy-storage modifier is positioned in pores on the surface of the aggregate;
the ionic liquid-like phase change energy storage modifier comprises ionic liquid with the phase change temperature ranging from 20 ℃ to 38 ℃.
2. The modified aggregate of claim 1, wherein the ionic liquid-like phase change energy storage modifier is a choline chloride-like ionic liquid.
3. The modified aggregate of claim 1, wherein the ionic liquid-like phase change energy storage modifier further comprises an alcohol having a phase change temperature in the range of 20-38 ℃.
4. The modified aggregate as set forth in claim 3, wherein said alcohol is polyethylene glycol and the degree of polymerization thereof is 600-1000;
the weight ratio range of the choline chloride ionic liquid to the polyethylene glycol is as follows: 1: (0.5-4).
5. The modified aggregate of any one of claims 1-4, wherein the aggregate is one of recycled brick residue, ceramsite or pumice.
6. A preparation method of modified aggregate comprises the following steps:
dipping: immersing the aggregate in a liquid-state ionic liquid phase-change energy-storage modifier so that the ionic liquid phase-change energy-storage modifier enters gaps of the aggregate, taking out the aggregate and cooling the aggregate to a saturated surface dry state;
wrapping pulp: and coating the surface of the aggregate in a saturated surface dry state with the cement-based slurry to form a shell, thus preparing the modified aggregate.
7. The method for preparing a modified aggregate according to claim 6, wherein in the impregnation step, the impregnation temperature is 40-60 ℃ and the immersion time is 20-48 h.
8. The method for preparing modified aggregate according to claim 6, wherein in the slurry coating step, the weight ratio of cement slurry to aggregate is 1: 4.
9. The concrete is characterized by being prepared from the following raw materials in parts by weight:
305-332 parts of cement;
280-320 parts of stone chips;
250-350 parts of sand;
120-180 parts of the modified aggregate described in any one of claims 1 to 5.
10. The concrete of claim 9, further comprising a water reducing agent in an amount of 1.5 to 2.1 parts by weight.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876153A (en) * | 2021-04-21 | 2021-06-01 | 西安天盛混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN114907044A (en) * | 2022-05-14 | 2022-08-16 | 中建西部建设北方有限公司 | Modified recycled brick slag and recycled wet-mixed mortar |
| CN115594433A (en) * | 2022-10-25 | 2023-01-13 | 宁波建工工程集团有限公司（Cn） | Preparation method of waste red brick phase-change aggregate and waste red brick phase-change aggregate |
| CN116283137A (en) * | 2023-02-21 | 2023-06-23 | 清华大学 | Thermoelectric cement-based composite material, and preparation method and application thereof |
-
2020
- 2020-12-18 CN CN202011504717.1A patent/CN112608053A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876153A (en) * | 2021-04-21 | 2021-06-01 | 西安天盛混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN114907044A (en) * | 2022-05-14 | 2022-08-16 | 中建西部建设北方有限公司 | Modified recycled brick slag and recycled wet-mixed mortar |
| CN115594433A (en) * | 2022-10-25 | 2023-01-13 | 宁波建工工程集团有限公司（Cn） | Preparation method of waste red brick phase-change aggregate and waste red brick phase-change aggregate |
| CN115594433B (en) * | 2022-10-25 | 2023-08-08 | 宁波建工工程集团有限公司 | Preparation method of waste red brick phase-change aggregate and waste red brick phase-change aggregate |
| CN116283137A (en) * | 2023-02-21 | 2023-06-23 | 清华大学 | Thermoelectric cement-based composite material, and preparation method and application thereof |
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