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CN-122010484-A - Building solid waste base double-curing high-strength wallboard and preparation method thereof

CN122010484ACN 122010484 ACN122010484 ACN 122010484ACN-122010484-A

Abstract

The invention discloses a building solid waste base double-maintenance high-strength wallboard, which belongs to the technical field of building materials and comprises 45-65 parts of building solid waste, 10-20 parts of coarse river sand, 5-15 parts of granulated blast furnace slag powder, 15-25 parts of ordinary Portland cement, 1-5 parts of polyvinyl alcohol fiber and 1-5 parts of polycarboxylic acid additive. According to the scheme of the invention, the steam curing can quickly enhance the strength of concrete, the quick demoulding can reduce the production time, and the carbon dioxide curing can chemically react with calcium oxide in the concrete to generate calcium carbonate with stable structure, so that the strength of the concrete is enhanced. The compression strength is improved through carbon dioxide maintenance, the cost of production materials is effectively reduced, and meanwhile, carbon dioxide can be effectively captured, and carbon dioxide emission is reduced.

Inventors

  • PAN ZHIKUN
  • CAO MINWEI
  • FENG ZHIYUAN
  • LIU ZHONGHUA
  • ZHANG ZHENJIE
  • YE XIAOWEN
  • LI CAICAI
  • ZHENG WEIJIE

Assignees

  • 深圳市特区建工环保科技投资有限公司

Dates

Publication Date
20260512
Application Date
20260108

Claims (6)

  1. 1. The building solid waste base double-curing high-strength wallboard is characterized by comprising the following raw materials in parts by weight: 45-65 parts of building solid waste, 10-20 parts of coarse river sand, 5-15 parts of granulated blast furnace slag powder, 15-25 parts of ordinary Portland cement, 1-5 parts of polyvinyl alcohol fiber and 1-5 parts of polycarboxylic acid additive.
  2. 2. The building solid waste based double-curing high-strength wallboard of claim 1, wherein the building solid waste consists of 35-45 parts of building solid waste with 5-25 mm particles and 10-20 parts of building solid waste with 1-5 mm particles.
  3. 3. The building solid waste based double maintenance high-strength wallboard of claim 1, wherein the specific surface area of the granulated blast furnace slag powder is not less than 450m2/kg.
  4. 4. The preparation method of the building solid waste base double-curing high-strength wallboard is characterized by comprising the following steps of: (1) Mixing, namely weighing the raw materials according to the weight parts of any one of claims 1-3, mixing the raw materials, adding water, stirring uniformly, and controlling the slump of the mixture to be 170-180 mm to obtain a mixture; (2) Cloth forming, namely placing a bound double-layer bidirectional reinforcing steel bar net in a steel mould, pouring a mixture, vibrating by a vibrating table, manually inserting and tamping, forming, and collecting a surface; (3) Steam curing, namely conveying the steel mould into a curing box, standing, introducing steam, heating, preserving heat, cooling to a temperature within 10 ℃ of the external environment temperature, and finishing steam curing; (4) Removing the mould, namely transporting the wallboard out of the curing box after the steam curing is finished, and removing the mould; (5) And (3) carbon dioxide curing, namely placing the wallboard into a curing box, introducing carbon dioxide for curing, and obtaining the building solid waste base double-curing high-strength wallboard after curing.
  5. 5. The preparation method of the building solid waste base double-maintenance high-strength wallboard is characterized in that the standing time in the step (3) is 5-7h, the temperature rising and heat preservation treatment method is to heat up to 80 ℃ from room temperature at a rate of 10-20 ℃ per hour and then to keep the temperature for 6h, and the temperature reducing method is to reduce the temperature at a rate of 10-15 ℃ per hour.
  6. 6. The method for preparing the building solid waste base double-curing high-strength wallboard according to claim 4, wherein the carbon dioxide in the step (5) is introduced at a rate of 0.1-0.5m3/min, the volume concentration of the carbon dioxide is 10-20%, and the curing time of the carbon dioxide is 2h.

Description

Building solid waste base double-curing high-strength wallboard and preparation method thereof Technical Field The invention relates to the technical field of building materials, in particular to a building solid waste base double-maintenance high-strength wallboard and a preparation method thereof. Background With the development of the urban society, the solid waste of the building is gradually called the maximum solid waste type generated in the production and life of people, and the annual generation amount of the solid waste is over 20 hundred million tons in the whole country at present. The resource utilization of the building solid waste becomes a social urgent research task. The traditional recycling of the solid waste of the building is mainly focused on manufacturing solid bricks, pavement bricks and the like, and the added value is low. The prefabricated wallboard is manufactured by regenerating the solid waste of the building, has higher added value, and can be widely used in various buildings. Therefore, the problem to be solved by the technicians in the field is to provide the building solid waste base double-maintenance high-strength wallboard with higher strength and capable of effectively capturing carbon dioxide and the preparation method thereof. Disclosure of Invention In view of the above, the invention provides a building solid waste base double-maintenance high-strength wallboard and a preparation method thereof. In order to achieve the above purpose, the invention adopts the following technical scheme: the building solid waste base double-curing high-strength wallboard comprises the following raw materials in parts by weight: 45-65 parts of building solid waste, 10-20 parts of coarse river sand, 5-15 parts of granulated blast furnace slag powder, 15-25 parts of ordinary Portland cement, 1-5 parts of polyvinyl alcohol fiber and 1-5 parts of polycarboxylic acid additive (namely polycarboxylic acid water reducer). Further, the building solid waste consists of 35-45 parts of building solid waste with 5-25 mm particles and 10-20 parts of building solid waste with 1-5 mm particles. Further, the specific surface area of the granulated blast furnace slag powder is not less than 450m2/kg. Further, the granulated blast furnace slag powder is a finely ground steel slag of a steel mill. The invention also provides a preparation method of the building solid waste base double-maintenance high-strength wallboard, which comprises the following steps: (1) Mixing materials, namely weighing the raw materials according to the weight parts, mixing the raw materials, adding water, stirring uniformly, and controlling the slump of the mixture to be 170-180 mm to obtain a mixture; (2) Cloth forming, namely placing a bound double-layer bidirectional reinforcing steel bar net in a steel mould, pouring a mixture, vibrating by a vibrating table, manually inserting and tamping, forming, and collecting a surface; (3) Steam curing, namely conveying the steel mould into a curing box, standing, introducing steam, heating, preserving heat, cooling to a temperature within 10 ℃ of the external environment temperature, and finishing steam curing; (4) Removing the mould, namely transporting the wallboard out of the curing box after the steam curing is finished, and removing the mould; (5) And (3) carbon dioxide curing, namely placing the wallboard into a curing box, introducing carbon dioxide for curing, and obtaining the building solid waste base double-curing high-strength wallboard after curing. And (3) standing for 5-7h, wherein the temperature rising and heat preservation treatment method is to heat up to 80 ℃ from room temperature at a rate of 10-20 ℃ per hour and then to perform constant temperature treatment for 6h, and the temperature lowering method is to cool down at a rate of 10-15 ℃ per hour. Further, the carbon dioxide in the step (5) is introduced at a rate of 0.1-0.5m3/min, the volume concentration of the carbon dioxide is 10-20%, and the curing time of the carbon dioxide is 2h. The further scheme has the advantages that the carbon dioxide curing technology is adopted, the redundant calcium oxide in the concrete is utilized to react with the carbon dioxide to generate the calcium carbonate with stable structure, the strength of the concrete can be improved, the carbon dioxide is absorbed, and the carbon dioxide emission in the production of building materials is reduced. The invention has the beneficial effects that: 1. The invention uses the crusher to crush the concrete components in the building solid waste, removes mortar wrapped on stones, screens the reduced broken stone, and the produced reclaimed material has high purity, and can be added with granulated blast furnace slag powder to produce high-performance reclaimed materials, thereby fully utilizing the building solid waste, and simultaneously using high-ductility fibers to enhance the toughness of the reclaimed concrete, improve the flexural st