CN119528518A - Phase change energy storage cement-based composite material PCM-UHPC and preparation method thereof - Google Patents
Phase change energy storage cement-based composite material PCM-UHPC and preparation method thereof Download PDFInfo
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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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- 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
- C04B14/06—Quartz; Sand
- C04B14/062—Microsilica, e.g. colloïdal silica
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- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/282—Polyurethanes; Polyisocyanates
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/36—Bituminous materials, e.g. tar, pitch
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0071—Phase-change materials, e.g. latent heat storage materials used in concrete compositions
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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Abstract
本发明涉及建筑材料技术领域，尤其涉及相变储能型水泥基复合材料PCM‑UHPC，包括超高性能水泥基材料（UHPC）基体和微胶囊化的相变储能材料（PCM微胶囊），其中所述微胶囊化的相变储能材料（PCM微胶囊）的微胶囊壁材采用聚合物与纳米无机材料复合，其中所述超高性能水泥基材料（UHPC）基体由硅酸盐水泥、硅灰、粉煤灰、石英粉、石英砂和减水剂组成。本发明中该材料兼具储能保温性能和超高力学性能，能够在温差变化较大的环境中实现温度调控和能量平衡，降低建筑物的采暖和制冷能耗，具备高热稳定性和长寿命，适用于建筑节能、温控桥梁和隧道等工程结构中。The present invention relates to the technical field of building materials, and in particular to a phase-change energy storage cement-based composite material PCM-UHPC, comprising an ultra-high performance cement-based material (UHPC) matrix and a microencapsulated phase-change energy storage material (PCM microcapsule), wherein the microcapsule wall material of the microencapsulated phase-change energy storage material (PCM microcapsule) is composited with a polymer and a nano-inorganic material, wherein the ultra-high performance cement-based material (UHPC) matrix is composed of silicate cement, silica fume, fly ash, quartz powder, quartz sand and a water reducer. In the present invention, the material has both energy storage and thermal insulation properties and ultra-high mechanical properties, can achieve temperature control and energy balance in an environment with large temperature differences, reduce heating and cooling energy consumption of buildings, has high thermal stability and long life, and is suitable for building energy conservation, temperature-controlled bridges and tunnels and other engineering structures.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a phase-change energy-storage type cement-based composite material PCM-UHPC and a preparation method thereof.
Background
Along with the increasing demand of energy saving and green buildings, the building materials are being developed towards multifunction and intellectualization, and the ultra-high performance cement-based material UHPC is widely applied to buildings and infrastructures as a cement-based composite material with high strength, low porosity and high durability, however, the traditional UHPC mainly focuses on mechanical properties and durability, lacks of temperature control and heat preservation properties, and the phase change material PCM is used as an efficient energy storage material, can regulate temperature fluctuation through a phase change process, and is suitable for being applied to the field of building energy conservation.
The PCM is introduced into the UHPC to prepare the PCM-UHPC composite material with the heat preservation and energy storage functions, the combination of mechanical property and temperature regulation performance can be realized, the PCM-UHPC composite material is a key material for the construction of green buildings and infrastructures in the future, but due to the fluidity and leakage of the PCM, the PCM-UHPC composite material has certain difficulty in being directly applied to cement-based materials, and by adopting a microcapsule packaging technology and combining a polymer and inorganic nano material composite wall material, the leakage and chemical aging problems of the PCM can be effectively solved, and the thermal cycling stability and interface binding force of the PCM are improved.
Disclosure of Invention
The invention aims to solve the defects in the prior art that the traditional UHPC mainly focuses on mechanical property and durability, lacks temperature control and heat preservation performance, has certain difficulty in directly applying the traditional UHPC to cement-based materials due to fluidity and leakage of the PCM, and provides a phase-change energy-storage type cement-based composite material PCM-UHPC and a preparation method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The phase change energy storage type cement-based composite material PCM-UHPC comprises an ultrahigh performance cement-based material (UHPC) matrix and microencapsulated phase change energy storage materials (PCM microcapsules), wherein microcapsule wall materials of the microencapsulated phase change energy storage materials (PCM microcapsules) are compounded by adopting polymers and nano inorganic materials.
Preferably, the ultra-high performance cement-based material (UHPC) matrix consists of 35-40% of silicate cement, 5-10% of silica fume, 10-15% of fly ash, 20-30% of quartz powder, 10-20% of quartz sand and 1-2% of water reducer by mass.
Preferably, the microencapsulated phase change energy storage material (PCM microcapsule) material is provided as a microencapsulated paraffin or hydrated salt phase change material.
Preferably, the microcapsule wall material of the microencapsulated phase change energy storage material (PCM microcapsule) is composed of Polyurethane (PU) and nano silicon dioxide (SiO) And (3) compounding.
A method for preparing a phase-change energy-storage type cement-based composite material PCM-UHPC, comprising the steps of preparing the microencapsulated phase-change energy-storage material (PCM microcapsule) and preparing the phase-change energy-storage type cement-based composite material PCM-UHPC, wherein the preparation of the microencapsulated phase-change energy-storage material (PCM microcapsule) comprises the following steps:
S1, preprocessing a phase change material, namely heating the selected phase change material (such as paraffin) to 35-60 ℃ until the phase change material is completely liquefied for standby;
S2, dispersing nano silicon dioxide, namely adding 0.5-2 wt% of nano silicon dioxide into 5-10 wt% of polyurethane solution, and performing ultrasonic dispersion treatment for 15-30 minutes (100-300W power) until uniformly dispersed polyurethane/SiO is formed Compounding the solution;
S3, gradually adding a liquid phase change material into the polyurethane solution, controlling the stirring speed to be 500-1500 rpm, and continuously forming stable emulsion for 10-20 minutes, controlling the stirring speed, and adjusting the stirring speed to be 500-1500 rpm according to the particle size requirement of the microcapsule;
S4, crosslinking polymerization reaction, namely adding 0.1-0.5 wt% of crosslinking agent (such as calcium chloride) into the emulsion, controlling the temperature at 40-60 ℃, continuously stirring for 30-60 minutes, ensuring that the crosslinking reaction is finished, and monitoring the viscosity and the temperature of the system in the polymerization reaction process, so as to ensure that the polyurethane can be completely crosslinked;
S5, washing and drying, namely, after the prepared microcapsule is centrifuged, washing the microcapsule for 3-5 times by using pure water or ethanol to remove residual unreacted substances, and drying the washed microcapsule for 4-8 hours at 50-80 ℃ to ensure that the water is evaporated and the microcapsule has stable structure.
Preferably, the preparation of the phase-change energy-storage type cement-based composite material PCM-UHPC comprises the following steps:
S1, premixing cement-based materials, namely weighing silicate cement, silica fume, fly ash, quartz powder, quartz sand and a water reducing agent, and pre-mixing all dry materials for 3-5 minutes to ensure uniform distribution and form cement-based material powder;
S2, doping the microencapsulated phase change energy storage material (PCM microcapsule) into the mixed cement-based material powder according to the proportion of 3-5 wt percent (based on the total weight of cement-based material), wherein the doping amount is too high, so that the mechanical property is possibly influenced, the energy storage effect is insufficient when the doping amount is too low, 3-5 percent is selected as an optimal balance point, and the low-speed stirring (150-180 rpm) is adopted for 5-10 minutes to mix so as to avoid the damage of the microcapsule and ensure the uniform distribution of the PCM in a matrix;
s3, preparing cement paste, namely adding 18-2wt% of mixing water of UHPC cementing material, adding 1-wt% of water reducer to improve the fluidity of the material, and stirring for 5-10 minutes with high efficiency until the paste is uniform, controlling the stirring speed to be 300-360rpm, and avoiding the microcapsule from cracking in strong stirring;
and S4, molding and curing, namely pouring the prepared slurry into a mold, discharging bubbles by light vibration, curing for 24 hours in a wet environment to prevent early water loss of the material, and curing the test piece for 28 days under the standard condition of 20 ℃ and 95% humidity after removing the mold to ensure complete hydration of the cement-based material and achieve the expected mechanical property.
Wherein, the silicate cement accounts for 35-40 wt percent in the cement-based material and is used as a main cementing material to provide matrix strength;
the silica fume accounts for 5-10 wt percent, plays a role in enhancing the compactness of the material, fills the pores of the cement matrix and improves the impermeability and the durability;
The ratio of the fly ash to the cement is 10-15 wt%, so that the workability is improved, the shrinkage is reduced, and the durability of the cement matrix is improved;
The quartz powder accounts for 20-30 wt percent, the packing compactness of the material is enhanced, and the compressive strength is improved;
The quartz sand accounts for 10-20 wt percent and is used as aggregate to provide support and strength;
the water reducer has a ratio of 1-2 wt%, is used for enhancing the fluidity of materials, ensures the uniformity of slurry and is convenient for molding.
Compared with the prior art, the invention has the beneficial effects that:
The phase-change energy-storage type heat-insulation ultrahigh-performance cement-based composite material PCM-UHPC provided by the invention improves the energy-storage and temperature-adjustment properties of the material and simultaneously maintains high strength and high durability by introducing the microcapsule phase-change material into the UHPC, has the characteristics of remarkable energy-saving effect, high thermal stability, excellent leakage resistance and ageing resistance and the like, is suitable for the fields of building energy conservation, temperature control bridges, tunnel engineering and the like, and has wide application prospects.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.
The phase change energy storage type cement-based composite material PCM-UHPC comprises an ultrahigh performance cement-based material (UHPC) matrix and microencapsulated phase change energy storage materials (PCM microcapsules), wherein microcapsule wall materials of the microencapsulated phase change energy storage materials (PCM microcapsules) are compounded by adopting polymers and nano inorganic materials.
The ultra-high performance cement-based material (UHPC) matrix consists of 35-40% of silicate cement, 5-10% of silica fume, 10-15% of fly ash, 20-30% of quartz powder, 10-20% of quartz sand and 1-2% of water reducer by mass percent.
The microencapsulated phase change energy storage material (PCM microcapsule) is prepared from microcapsule-encapsulated paraffin or hydrated salt phase change material, and microcapsule wall material of the microencapsulated phase change energy storage material (PCM microcapsule) comprises Polyurethane (PU) and nano silicon dioxide (SiO)) And (3) compounding.
The preparation method of the phase-change energy-storage type cement-based composite material PCM-UHPC comprises the steps of preparing a microencapsulated phase-change energy-storage material (PCM microcapsule) and preparing the phase-change energy-storage type cement-based composite material PCM-UHPC, wherein the preparation of the microencapsulated phase-change energy-storage material (PCM microcapsule) comprises the following steps:
S1, preprocessing a phase change material, namely heating the selected phase change material (such as paraffin) to 35-60 ℃ until the phase change material is completely liquefied for standby;
s2, dispersing nano silicon dioxide, namely adding 0.5-2 wt% of nano silicon dioxide into 5-10 wt% of polyurethane solution, and performing ultrasonic dispersion treatment for 15-30 minutes (100-300W power) until a uniformly dispersed polyurethane/SiO 2 composite solution is formed;
S3, gradually adding a liquid phase change material into the polyurethane solution, controlling the stirring speed to be 500-1500 rpm, and continuously forming stable emulsion for 10-20 minutes, controlling the stirring speed, and adjusting the stirring speed to be 500-1500 rpm according to the particle size requirement of the microcapsule;
S4, crosslinking polymerization reaction, namely adding 0.1-0.5 wt% of crosslinking agent (such as calcium chloride) into the emulsion, controlling the temperature at 40-60 ℃, continuously stirring for 30-60 minutes, ensuring that the crosslinking reaction is finished, and monitoring the viscosity and the temperature of the system in the polymerization reaction process, so as to ensure that the polyurethane can be completely crosslinked;
S5, washing and drying, namely, after the prepared microcapsule is centrifuged, washing the microcapsule for 3-5 times by using pure water or ethanol to remove residual unreacted substances, and drying the washed microcapsule for 4-8 hours at 50-80 ℃ to ensure that the water is evaporated and the microcapsule has stable structure.
The preparation of the phase-change energy-storage type cement-based composite material PCM-UHPC comprises the following steps:
S1, premixing cement-based materials, namely weighing silicate cement, silica fume, fly ash, quartz powder, quartz sand and a water reducing agent, and pre-mixing all dry materials for 3-5 minutes to ensure uniform distribution and form cement-based material powder;
S2, doping the microencapsulated phase change energy storage material (PCM microcapsule) into the mixed cement-based material powder according to the proportion of 3-5 wt percent (based on the total weight of cement-based material), wherein the doping amount is too high, so that the mechanical property is possibly influenced, the energy storage effect is insufficient when the doping amount is too low, 3-5 percent is selected as an optimal balance point, and the low-speed stirring (150-180 rpm) is adopted for 5-10 minutes to mix so as to avoid the damage of the microcapsule and ensure the uniform distribution of the PCM in a matrix;
s3, preparing cement paste, namely adding 18-2wt% of mixing water of UHPC cementing material, adding 1-wt% of water reducer to improve the fluidity of the material, and stirring for 5-10 minutes with high efficiency until the paste is uniform, controlling the stirring speed to be 300-360rpm, and avoiding the microcapsule from cracking in strong stirring;
and S4, molding and curing, namely pouring the prepared slurry into a mold, discharging bubbles by light vibration, curing for 24 hours in a wet environment to prevent early water loss of the material, and curing the test piece for 28 days under the standard condition of 20 ℃ and 95% humidity after removing the mold to ensure complete hydration of the cement-based material and achieve the expected mechanical property.
In the cement-based material, the silicate cement accounts for 35-40 wt percent and is used as a main cementing material to provide matrix strength;
the silica fume accounts for 5-10 wt percent, plays a role in enhancing the compactness of the material, fills the pores of the cement matrix and improves the impermeability and the durability;
The ratio of the fly ash to the cement is 10-15 wt%, so that the workability is improved, the shrinkage is reduced, and the durability of the cement matrix is improved;
The quartz powder accounts for 20-30 wt percent, the packing compactness of the material is enhanced, and the compressive strength is improved;
The quartz sand accounts for 10-20 wt percent and is used as aggregate to provide support and strength;
the water reducer has a ratio of 1-2 wt%, is used for enhancing the fluidity of materials, ensures the uniformity of slurry and is convenient for molding.
Example 1
Preparation of microencapsulated phase change energy storage materials (PCM microcapsules):
raw materials are paraffin wax (melting point is 28 ℃, latent heat is 180J/g), polyurethane (PU), nano silicon dioxide (SiO) )。
The preparation method comprises the following steps:
S1, heating paraffin to 35 ℃ and keeping a liquid state for standby;
s2, adding 0.5% of nano silicon dioxide into the polyurethane solution, and performing ultrasonic dispersion for 15 minutes to form a uniform solution;
s3, adding liquid paraffin into the wall material solution by an emulsification method, and stirring at a high speed to form emulsion;
s4, adding 0.2% of cross-linking agent, stirring for 60 minutes to form microencapsulated PCM, centrifuging, washing and drying to obtain a finished product.
Preparation of PCM-UHPC composite material:
the raw materials comprise microencapsulated paraffin, silicate cement, silica fume, fly ash, quartz powder, quartz sand and water reducer.
The preparation method comprises the following steps:
s1, preparing microencapsulated paraffin according to the embodiment 1, wherein the doping amount is 4% of the total weight of the cement-based material;
s2, proportioning 35% of Portland cement, 8% of silica fume, 12% of fly ash, 25% of quartz powder, 17% of quartz sand, 1% of water reducer and 4% of microencapsulated PCM;
and S3, adding the microencapsulated phase change energy storage material (PCM microcapsule) into the powder, uniformly mixing, adding water, stirring into slurry, pouring into a mould, and curing for 28 days.
Test results
The mechanical property is about 130 MPa, the compressive strength is about 15 MPa, and compared with the traditional UHPC, the mechanical property is slightly reduced, but the engineering requirement is met.
The energy storage performance is improved by 30 percent under the temperature difference of 20 to 35 ℃, and the temperature fluctuation is reduced by 2 to 3 ℃.
Thermal cycle stability, namely after 100 times of thermal cycles, the PCM has no leakage phenomenon and the phase change latent heat has no obvious attenuation.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The phase-change energy-storage type cement-based composite material PCM-UHPC is characterized by comprising an ultra-high-performance cement-based material (UHPC) matrix and a microencapsulated phase-change energy-storage material (PCM microcapsule), wherein microcapsule wall materials of the microencapsulated phase-change energy-storage material (PCM microcapsule) are compounded by adopting polymers and nano inorganic materials.
2. The phase-change energy-storage type cement-based composite material PCM-UHPC according to claim 1, wherein the ultra-high-performance cement-based material (UHPC) matrix consists of 35-40% of silicate cement, 5-10% of silica fume, 10-15% of fly ash, 20-30% of quartz powder, 10-20% of quartz sand and 1-2% of water reducer.
3. The phase-change energy-storage cement-based composite PCM-UHPC according to claim 1, wherein the microencapsulated phase-change energy storage material (PCM microcapsule) material is provided as a microencapsulated paraffin or hydrated salt phase-change material.
4. The phase-change energy-storage cement-based composite PCM-UHPC according to claim 1, wherein the microcapsule wall material of the microencapsulated phase-change energy-storage material (PCM microcapsule) is composed of Polyurethane (PU) and nano silica (SiO) And (3) compounding.
5. A method of preparing a phase change energy storage cement based composite PCM-UHPC according to any one of claims 1-4, comprising the preparation of the microencapsulated phase change energy storage material (PCM microcapsules) and the preparation of the phase change energy storage cement based composite PCM-UHPC, the preparation of the microencapsulated phase change energy storage material (PCM microcapsules) comprising the steps of:
S1, preprocessing a phase change material, namely heating the selected phase change material (such as paraffin) to 35-60 ℃ until the phase change material is completely liquefied for standby;
s2, dispersing nano silicon dioxide, namely adding 0.5-2 wt% of nano silicon dioxide into 5-10 wt% of polyurethane solution, and performing ultrasonic dispersion treatment for 15-30 minutes (100-300W power) until a uniformly dispersed polyurethane/SiO 2 composite solution is formed;
S3, gradually adding a liquid phase change material into the polyurethane solution, controlling the stirring speed to be 500-1500 rpm, and continuously forming stable emulsion for 10-20 minutes, controlling the stirring speed, and adjusting the stirring speed to be 500-1500 rpm according to the particle size requirement of the microcapsule;
S4, crosslinking polymerization reaction, namely adding 0.1-0.5 wt% of crosslinking agent (such as calcium chloride) into the emulsion, controlling the temperature at 40-60 ℃, continuously stirring for 30-60 minutes, ensuring that the crosslinking reaction is finished, and monitoring the viscosity and the temperature of the system in the polymerization reaction process, so as to ensure that the polyurethane can be completely crosslinked;
S5, washing and drying, namely, after the prepared microcapsule is centrifuged, washing the microcapsule for 3-5 times by using pure water or ethanol to remove residual unreacted substances, and drying the washed microcapsule for 4-8 hours at 50-80 ℃ to ensure that the water is evaporated and the microcapsule has stable structure.
6. The method for preparing the phase-change energy-storage type cement-based composite material PCM-UHPC according to claim 5, wherein the preparation of the phase-change energy-storage type cement-based composite material PCM-UHPC comprises the following steps:
S1, premixing cement-based materials, namely weighing silicate cement, silica fume, fly ash, quartz powder, quartz sand and a water reducing agent, and pre-mixing all dry materials for 3-5 minutes to ensure uniform distribution and form cement-based material powder;
S2, doping the microencapsulated phase change energy storage material (PCM microcapsule) into the mixed cement-based material powder according to the proportion of 3-5 wt percent (based on the total weight of cement-based material), wherein the doping amount is too high, so that the mechanical property is possibly influenced, the energy storage effect is insufficient when the doping amount is too low, 3-5 percent is selected as an optimal balance point, and the low-speed stirring (150-180 rpm) is adopted for 5-10 minutes to mix so as to avoid the damage of the microcapsule and ensure the uniform distribution of the PCM in a matrix;
s3, preparing cement paste, namely adding 18-2wt% of mixing water of UHPC cementing material, adding 1-wt% of water reducer to improve the fluidity of the material, and stirring for 5-10 minutes with high efficiency until the paste is uniform, controlling the stirring speed to be 300-360rpm, and avoiding the microcapsule from cracking in strong stirring;
and S4, molding and curing, namely pouring the prepared slurry into a mold, discharging bubbles by light vibration, curing for 24 hours in a wet environment to prevent early water loss of the material, and curing the test piece for 28 days under the standard condition of 20 ℃ and 95% humidity after removing the mold to ensure complete hydration of the cement-based material and achieve the expected mechanical property.
7. The method for preparing a phase-change energy-storage type cement-based composite material PCM-UHPC according to claim 6, wherein the cement-based material comprises 35-40 wt% of Portland cement as a main cementing material to provide matrix strength;
the silica fume accounts for 5-10 wt percent, plays a role in enhancing the compactness of the material, fills the pores of the cement matrix and improves the impermeability and the durability;
The ratio of the fly ash to the cement is 10-15 wt%, so that the workability is improved, the shrinkage is reduced, and the durability of the cement matrix is improved;
The quartz powder accounts for 20-30 wt percent, the packing compactness of the material is enhanced, and the compressive strength is improved;
The quartz sand accounts for 10-20 wt percent and is used as aggregate to provide support and strength;
the water reducer has a ratio of 1-2 wt%, is used for enhancing the fluidity of materials, ensures the uniformity of slurry and is convenient for molding.
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| CN202411780636.2A CN119528518A (en) | 2024-12-05 | 2024-12-05 | Phase change energy storage cement-based composite material PCM-UHPC and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119954479A (en) * | 2025-03-03 | 2025-05-09 | 西安建筑科技大学 | A PCM-based energy storage building material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119954479A (en) * | 2025-03-03 | 2025-05-09 | 西安建筑科技大学 | A PCM-based energy storage building material and preparation method thereof |
| CN119954479B (en) * | 2025-03-03 | 2025-09-12 | 西安建筑科技大学 | Energy storage building material based on PCM (pulse code modulation) and preparation method thereof |
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