Search

CN-122010479-A - Concrete for modularized building and preparation method and application thereof

CN122010479ACN 122010479 ACN122010479 ACN 122010479ACN-122010479-A

Abstract

The invention relates to concrete for modular construction and a preparation method and application thereof, wherein the concrete comprises, by weight, 280-320 parts of cement, 150-200 parts of slag powder, 50-70 parts of fly ash, 5-15 parts of rice hull ash, 800-880 parts of recycled coarse aggregate, 700-890 parts of recycled fine aggregate, 7-14 parts of water reducer, 0.3-0.8 part of isopropyl acrylamide-polyethylene glycol copolymer, 2-5 parts of rice hull-derived biological nanofibers and 130-160 parts of water. The high-performance low-carbon concrete is constructed by taking industrial byproducts such as high-proportion slag powder, fly ash and the like and agricultural wastes such as rice hull ash and the like as admixture to partially replace cement and optimizing the overall proportion, and the implicit carbon emission and the production cost of the admixture are far lower than those of the cement, so that the carbon emission and the raw material cost of the concrete in unit volume are remarkably reduced, and the concrete is green and environment-friendly and has low cost.

Inventors

  • WANG QIONG
  • CHEN KUNYANG
  • XU XIN
  • YAO JIE
  • ZHAO BAOJUN
  • ZHANG ZONGJUN
  • HOU MIAOMIAO
  • HUANG PEIYING
  • ZHOU JIFEI

Assignees

  • 中建海龙科技有限公司
  • 安徽海龙建筑工业有限公司

Dates

Publication Date
20260512
Application Date
20251230

Claims (10)

  1. 1. The concrete for the modularized building is characterized by comprising, by weight, 280-320 parts of cement, 150-200 parts of slag powder, 50-70 parts of fly ash, 5-15 parts of rice hull ash, 800-880 parts of recycled coarse aggregate, 700-890 parts of recycled fine aggregate, 7-14 parts of water reducer, 0.3-0.8 part of isopropyl acrylamide-polyethylene glycol copolymer, 2-5 parts of rice hull derived biological nanofiber and 130-160 parts of water.
  2. 2. The concrete for modular construction of claim 1, wherein: The critical dissolution temperature of the isopropyl acrylamide-polyethylene glycol copolymer is 25-30 ℃, the isopropyl acrylamide-polyethylene glycol copolymer is kept in a liquid state when the ambient temperature is lower than the critical dissolution temperature, and the isopropyl acrylamide-polyethylene glycol copolymer forms a gel structure when the ambient temperature is higher than the critical dissolution temperature; the average diameter of the rice hull-derived biological nano fiber is 50-200nm, the average length is 10-50 mu m, and the crystallinity is 65-75%, and the rice hull-derived biological nano fiber is cellulose nano fiber extracted from rice hulls by a TEMPO oxidation method.
  3. 3. The concrete for modular construction of claim 1, wherein: The cement is 52.5-grade cement, the specific surface area of the slag powder is 350-450m 2 /kg, the content of calcium aluminosilicate is more than 20%, the specific surface area of the fly ash is 2400-2600m 2 /kg, and the content of SiO 2 in the rice hull ash is more than or equal to 90%.
  4. 4. The concrete for modular construction according to claim 1, wherein the recycled coarse aggregate has a particle size of 5 to 20mm, and the recycled fine aggregate has a particle size of 1.6 to 3.0mm; The weight of the water reducing agent accounts for 1.0% -2.27% of the total weight of the cement, the slag powder, the fly ash and the rice hull ash.
  5. 5. The concrete for modular construction according to claim 4, wherein the recycled coarse aggregate is at least one of construction demolition concrete crushed material and steel slag, and the recycled fine aggregate is at least one of machine-made sand, tailing sand and ceramic waste.
  6. 6. The concrete for modular construction of claim 5, wherein the recycled coarse aggregate is formed by compounding a first recycled coarse aggregate with a particle size of 5-10mm and a second recycled coarse aggregate with a particle size of 15-20mm, and the weight ratio of the first recycled coarse aggregate to the second recycled coarse aggregate is 1.5-2.5:1.
  7. 7. The concrete for modular construction according to claim 1, wherein the water reducing agent is at least one of a polycarboxylic acid water reducing agent, an sulfamic acid water reducing agent and a naphthalene water reducing agent; the water reducing rate of the water reducing agent is more than or equal to 25 percent.
  8. 8. A method of preparing concrete for modular construction according to any one of claims 1 to 7, comprising the steps of: S1, preparing rice hull-derived biological nanofibers, namely performing TEMPO oxidation treatment on rice hulls to obtain the rice hull-derived biological nanofibers; s2, dry mixing, namely adding the recycled coarse aggregate into stirring equipment for stirring, and sequentially adding cement, slag powder, fly ash, rice hull ash and recycled fine aggregate for dry mixing to obtain a dry mixed material; S3, preparing mixing water, namely uniformly mixing the isopropyl acrylamide-polyethylene glycol copolymer, the water reducer and the rice hull-derived biological nano fibers in the S1 with water to obtain mixing water; s4, preparing slurry, namely adding the mixing water in the step S3 into the dry mixed material in the step S2 in a divided manner, and stirring until uniform concrete slurry is obtained; And S5, curing, namely pouring the concrete slurry of the S4 into a mould, vibrating and compacting, and curing under the condition that the temperature is 20+/-2 ℃ and the humidity is more than or equal to 95%.
  9. 9. The method of claim 8, wherein in S1, the rice hull-derived biological nanofiber preparation comprises: S11, cleaning and drying, namely washing rice hulls to remove impurities, and drying at 80-120 ℃ until the water content is less than or equal to 5%; S12, TEMPO oxidation treatment, namely mixing the dried rice hulls with a TEMPO oxidant according to the mass ratio of 1:0.5-1, and carrying out oxidation reaction under the assistance of ultrasonic waves to obtain rice hull fibers; S13, homogenizing and dispersing under high pressure, namely placing the oxidized rice hull fibers under 20-35MPa for homogenizing and dispersing to obtain the rice hull-derived biological nanofibers.
  10. 10. Use of a concrete according to any one of claims 1-9 for the preparation of modular building elements.

Description

Concrete for modularized building and preparation method and application thereof Technical Field The invention relates to the technical field of building concrete, in particular to concrete for modular building and a preparation method and application thereof. Background Along with the continuous expansion of the scale of the construction industry in China, the construction industry has become an important field of energy consumption and carbon emission. Wherein the production and use links of the concrete material contribute to the main part of the carbon emission of the whole life cycle of the building. In recent years, the modularized building is taken as an important technical approach of green low-carbon transformation in the building field, and energy consumption and material waste in a construction site can be effectively reduced through factory prefabrication, standardized production and efficient construction, so that a new solution is provided for realizing the carbon reduction target in the building industry. The traditional concrete is used as a core material of a building structure, the carbon emission intensity of the traditional concrete is as high as 0.9kgCO 2/kg of cement, and the annual cement yield of China is about 50% worldwide, so that the annual carbon emission of the building industry exceeds 15 hundred million tons. The existing concrete preparation technology takes silicate cement as a cementing material, a large amount of process carbon emission is generated in the cement clinker calcination process, meanwhile, the cement is high in price, the production cost is high, and a large amount of cement consumption and carbon emission are caused. Disclosure of Invention First, the technical problem to be solved In view of the above-mentioned shortcomings and disadvantages of the prior art, the present invention provides a concrete for modular construction, and a preparation method and application thereof, which solve the technical problems of large cement consumption, heavy pollution, high carbon emission and high cost in the conventional concrete technology. (II) technical scheme In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps: In a first aspect, the embodiment of the invention provides concrete for modular construction, which comprises, by weight, 280-320 parts of cement, 150-200 parts of slag powder, 50-70 parts of fly ash, 5-15 parts of rice hull ash, 800-880 parts of recycled coarse aggregate, 700-890 parts of recycled fine aggregate, 7-14 parts of water reducer, 0.3-0.8 part of isopropyl acrylamide-polyethylene glycol copolymer, 2-5 parts of rice hull-derived biological nanofibers and 130-160 parts of water. As a preferred embodiment of the invention, the critical dissolution temperature of the isopropyl acrylamide-polyethylene glycol copolymer is 25-30 ℃, the isopropyl acrylamide-polyethylene glycol copolymer is kept in a liquid state when the ambient temperature is lower than the critical dissolution temperature, and the isopropyl acrylamide-polyethylene glycol copolymer forms a gel structure when the ambient temperature is higher than the critical dissolution temperature; the average diameter of the rice hull-derived biological nano fiber is 50-200nm, the average length is 10-50 mu m, and the crystallinity is 65-75%, and the rice hull-derived biological nano fiber is cellulose nano fiber extracted from rice hulls by a TEMPO oxidation method. Preferably, the isopropyl acrylamide-polyethylene glycol copolymer is 0.4-0.7 part, and the rice hull-derived biological nanofiber is 2.5-4 parts. As a preferred embodiment of the invention, the cement is 52.5 grade cement, the specific surface area of the slag powder is 350-450m 2/kg, the calcium aluminosilicate content is more than 20%, the specific surface area of the fly ash is 2400-2600m 2/kg, and the SiO 2 content in the rice hull ash is more than or equal to 90%. As a preferred embodiment of the invention, the particle size of the recycled coarse aggregate is 5-20mm, and the particle size of the recycled fine aggregate is 1.6-3.0mm; The weight of the water reducing agent accounts for 1.0% -2.27% of the total weight of the cement, the slag powder, the fly ash and the rice hull ash. As a preferred embodiment of the invention, the recycled coarse aggregate is at least one of broken materials of building demolition concrete and steel slag, and the recycled fine aggregate is at least one of machine-made sand, tailing sand and ceramic waste. As a preferred embodiment of the invention, the recycled coarse aggregate is formed by compounding a first recycled coarse aggregate with the particle size of 5-10mm and a second recycled coarse aggregate with the particle size of 15-20mm, and the weight ratio of the first recycled coarse aggregate to the second recycled coarse aggregate is 1.5-2.5:1. As a preferred embodiment of the present invention, the water reducing agent is at