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CN-118324453-B - Micro-encapsulated phase-change composite base polymer concrete and preparation method and application thereof

CN118324453BCN 118324453 BCN118324453 BCN 118324453BCN-118324453-B

Abstract

The application discloses microencapsulated phase change composite base polymer concrete and a preparation method and application thereof, wherein the microencapsulated phase change composite base polymer concrete comprises, by weight, 160-165 parts of slag, 240-260 parts of fly ash, 160-165 parts of alkali-activated agent, 56-65 parts of water, 160-165 parts of dry sand, 860-865 parts of coarse aggregate and 0.1-20 parts of microencapsulated phase change material. The micro-encapsulated phase-change composite base polymer concrete prepared by the method not only reduces the influence on the environment in the cement production process, but also can bring the heat storage property of the micro-encapsulated phase-change material into play to the greatest extent, and can also improve the compressive strength of the micro-encapsulated phase-change composite base polymer concrete, thereby overcoming the technical bottleneck problem of low mechanical property of the micro-encapsulated phase-change cement base concrete.

Inventors

  • Fu Huanchang
  • WU YANHAI
  • YANG LINQING
  • LI LENGXUE

Assignees

  • 广州理工学院

Dates

Publication Date
20260505
Application Date
20240301

Claims (7)

  1. 1. The microencapsulated phase change composite base polymer concrete is characterized by comprising, by weight, 160-165 parts of slag, 240-260 parts of fly ash, 160-165 parts of alkali-exciting agent, 56-65 parts of water, 160-165 parts of dry sand, 860-865 parts of coarse aggregate and 0.1-20 parts of microencapsulated phase change material; Wherein the alkali-activated agent is obtained by mixing sodium hydroxide and sodium silicate in a volume ratio of (0.4-0.6): 1; The micro-encapsulation phase change material comprises a shell and a core material, wherein the shell wraps the core material, the shell is a copolymer composed of low-density polyethylene and vinyl acetate, the core material is paraffin, and the melting point of the micro-encapsulation phase change material is 28.4+/-0.9 ℃; the coarse aggregate is a construction waste material and is obtained through crushing treatment, grading treatment and modification treatment, wherein the modification treatment comprises the steps of immersing the graded coarse aggregate in methyl methacrylate, heating to 40-45 ℃, adding aluminum acetylacetonate, immersing for 12-15 hours to obtain an immersed coarse aggregate, and placing the immersed coarse aggregate in water at 50-80 ℃ for 5-8 hours and drying.
  2. 2. The microencapsulated phase change composite matrix polymer concrete of claim 1, wherein the preparation method of the microencapsulated phase change material comprises the following steps: and adding the low-density polyethylene and the vinyl acetate into a reaction kettle, heating to 100-200 ℃, treating for 1-5 hours at 100-200 ℃, adding paraffin, and spray drying to obtain the microencapsulated phase change material.
  3. 3. The micro-encapsulated phase-change composite matrix polymer concrete according to claim 1, wherein the mass ratio of the low-density polyethylene to the vinyl acetate is (1-5): 1-3.
  4. 4. The micro-encapsulated phase-change composite matrix polymer concrete according to claim 3, wherein the addition amount of the paraffin accounts for 35% -75% of the mass of the micro-encapsulated phase-change material.
  5. 5. The microencapsulated phase change composite matrix polymer concrete of claim 2, wherein the spray-drying temperature is 120 ℃ to 180 ℃.
  6. 6. A method for preparing a microencapsulated phase change composite base polymer concrete, which is characterized in that the method is used for preparing the microencapsulated phase change composite base polymer concrete according to any one of claims 1 to 5, and comprises the following steps: mixing fly ash, slag, alkali-activated agent and water to obtain composite base polymer slurry; adding the composite base polymer slurry into dry sand, and fully stirring for 30-60 s to prepare composite base polymer mortar; adding coarse aggregate into the composite base polymer mortar, and fully stirring for 2-5 min to obtain composite base polymer concrete; and fully stirring the micro-encapsulated phase-change material in the composite base polymer concrete for 2-5 min to obtain the micro-encapsulated phase-change composite base polymer concrete.
  7. 7. An application of micro-encapsulated phase-change composite base polymer concrete is characterized in that, the application is that the micro-encapsulated phase-change composite base polymer concrete as claimed in claim 1 is used as a building material, and the building material is a semi-finished product material and/or a finished product material.

Description

Micro-encapsulated phase-change composite base polymer concrete and preparation method and application thereof Technical Field The invention relates to the technical field of building materials, in particular to micro-encapsulation phase-change composite base polymer concrete and a preparation method and application thereof. Background The microencapsulated phase change material absorbs excessive heat by melting in the daytime, and when the temperature is reduced at night, the heat is released and solidified, so that the microencapsulated phase change material has higher latent heat capacity, can store a large amount of heat energy in the phase change process, and attracts attention in the building industry due to the excellent heat storage capacity. However, with the addition of the microencapsulated phase change material, the interface gap between the microencapsulated phase change material and the concrete matrix is increased, so that the compressive strength of the cement-based concrete is greatly reduced, and the development and application of the microencapsulated phase change material are greatly limited. In addition, a large amount of CO 2 greenhouse gases are generated when cement is produced, so that the environment is seriously polluted. In the prior art, the geopolymer prepared by using industrial waste residues such as fly ash, slag and the like and combining an alkali-activated agent can be used as a substitute for ordinary Portland cement, so that the pollution to the environment caused by cement production is reduced, and the geopolymer is a novel green inorganic cementing material. The geopolymer forms high-strength C/N-A-S-H gel in the hydration process, has excellent mechanical strength, can improve the interfacial bonding strength between concrete matrixes, and is Sup>A high-performance building material. However, although the composite base polymer has excellent strength, the synergistic effect between the composite base polymer and the micro-encapsulated phase change material is not yet studied clearly, a great amount of research data and theoretical basis are also seen, and particularly, the substitution rate of the micro-encapsulated phase change material has little research on the mechanical properties of the composite base polymer concrete, which greatly restricts the popularization and application of the micro-encapsulated phase change composite base polymer concrete. How to perfectly combine the advantages of the micro-encapsulated phase-change material and the geopolymer concrete becomes the key for popularizing the novel building material. Moreover, how to effectively utilize and treat a large amount of construction waste is an increasingly focused problem, the rapid development of the construction industry is realized, the use amount of concrete is gradually increased, the waste concrete is crushed and graded to obtain the recycled aggregate, on one hand, the environmental pollution caused by construction waste can be reduced, and on the other hand, the requirement of part of the construction industry on sand and stone can be met, but the problems of rough material surface, large porosity and cracks easily caused by the action of external force also exist, and therefore, the improvement of the mechanical property of coarse aggregate is also a problem to be solved urgently. Disclosure of Invention Based on the problems that in the prior art, the research on the influence of the substitution rate of the micro-encapsulation phase-change material on the physical properties of the composite base polymer is insufficient, the surface of the material is rough, the porosity is large, and cracks are easily caused by the action of external force are solved, the invention provides micro-encapsulation phase-change composite base polymer concrete and a preparation method and application thereof, and the concrete technical scheme is as follows: 160-165 parts of slag, 240-260 parts of fly ash, 160-165 parts of alkali-activated agent, 56-65 parts of water, 160-165 parts of dry sand, 860-865 parts of coarse aggregate and 0.1-20 parts of microencapsulated phase change material; Wherein the alkali-activated agent is obtained by mixing sodium hydroxide and sodium silicate in a volume ratio of (0.4-0.6): 1; the micro-encapsulation phase change material comprises a shell and a core material, wherein the shell wraps the core material, the shell is a copolymer composed of low-density polyethylene and vinyl acetate, and the core material is paraffin. Further, the melting point of the microencapsulated phase change material is 28.4+ -0.9 ℃. Further, the preparation method of the micro-encapsulated phase change material comprises the following steps: and adding the low-density polyethylene and the vinyl acetate into a reaction kettle, heating to 100-200 ℃, treating for 1-5 hours at 100-200 ℃, adding paraffin, and spray drying to obtain the microencapsulated phase change material. Further, the mass ratio