CN109678435B - GRC decorative curtain wall board made of low-quality recycled fine aggregate and preparation method thereof - Google Patents
GRC decorative curtain wall board made of low-quality recycled fine aggregate and preparation method thereof Download PDFInfo
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- CN109678435B CN109678435B CN201811502423.8A CN201811502423A CN109678435B CN 109678435 B CN109678435 B CN 109678435B CN 201811502423 A CN201811502423 A CN 201811502423A CN 109678435 B CN109678435 B CN 109678435B
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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
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/88—Curtain walls
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Finishing Walls (AREA)
Abstract
The invention relates to a GRC decorative curtain wall board made of low-quality recycled fine aggregate and a preparation method thereof, wherein the GRC decorative curtain wall board comprises the following components in parts by weight: 800 parts of low-alkalinity sulphoaluminate cement, 1400 parts of recycled fine aggregate, 10-40 parts of polycarboxylic acid water reducing agent and 2-4 parts of alkali-resistant glass fiber. According to the GRC decorative curtain wall board manufactured by using the low-quality recycled fine aggregate and the preparation method thereof, the GRC decorative curtain wall board is manufactured by using the low-quality recycled fine aggregate, so that the application range of the low-quality recycled fine aggregate is expanded, the utilization rate of construction demolition waste is improved, and good environmental benefit, economic benefit and social benefit are achieved.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a GRC decorative curtain wall board manufactured by using low-quality recycled fine aggregate and a preparation method thereof.
Background
Along with the continuous improvement of the urbanization level of China and the continuous expansion of the urban scale, the removal and transformation of old urban areas enable the removal area of buildings in the past 10 years of China to continuously increase. The demolition area of the buildings in China in 2017 reaches 14.36 hundred million square meters. According to statistics, the unit area output coefficient of the construction waste generated by demolishing old buildings is 906.7-1335.5 kilograms per square meter, and the conservative estimation shows that the quantity of the construction waste generated in the process of demolishing the buildings in 2017 in China is 16 hundred million tons. In the products of crushing and screening the construction waste, only 9 percent of high-quality aggregate and 6 percent of common-quality aggregate can be directly applied to producing asphalt concrete and common concrete, and the reuse of the rest 85 percent of low-quality aggregate is greatly limited due to high porosity, large water absorption and low strength.
Disclosure of Invention
The invention aims to provide a GRC decorative curtain wall board made of low-quality recycled fine aggregate and a preparation method thereof, and solves the problem that the low-quality fine aggregate in the existing construction waste is not fully and reasonably utilized.
The technical scheme adopted by the invention for solving the technical problem is as follows: a GRC decorative curtain wall board made of low-quality recycled fine aggregate comprises the following components in parts by mass: 800 parts of low-alkalinity sulphoaluminate cement, 1400 parts of recycled fine aggregate, 10-40 parts of polycarboxylic acid water reducing agent and 2-4 parts of alkali-resistant glass fiber.
The GRC decorative curtain wall board comprises the following components in parts by mass: 650 parts of low-alkalinity sulphoaluminate cement 550-.
In the GRC decorative curtain wall board, the recycled fine aggregate is obtained by pretreating fine aggregate with the size of less than 2mm after crushing and screening construction demolition waste.
In the GRC decorative curtain wall panel of the present invention, the pretreatment means: drying fine aggregate smaller than 2mm, pouring the dry fine aggregate into water doped with sulfamate water reducer, soaking and stirring the dry fine aggregate, and then taking out the dry fine aggregate, standing and aging the dry fine aggregate until the water content is stabilized within the range of 15-25%.
In the GRC decorative curtain wall board, fine aggregate with the thickness less than 2mm is dried until the water content is less than or equal to 0.5 percent; the concentration of the sulfamate water reducer in the water doped with the sulfamate water reducer is 0.3-0.6%; soaking and stirring for 3-10 min; the aging time is more than 1 day.
The invention also provides a preparation method of the GRC decorative curtain wall board made of the low-quality recycled fine aggregate, which comprises the steps of adding water with the mass part ratio of 100 plus materials and 200 parts into the components of 400 plus materials and 800 parts of low-alkalinity sulphoaluminate cement, 1000 plus materials and 1400 parts of recycled fine aggregate, 10-40 parts of polycarboxylic acid water reducer and 2-4 parts of alkali-resistant glass fiber, mixing and stirring the components to a uniform state, putting the components into a mold, performing vibration molding, and demolding after curing to prepare the GRC decorative curtain wall board.
In the preparation method of the invention, the curing time is 4-24 h.
In the preparation method, the recycled fine aggregate is obtained by pretreating fine aggregates with the particle size of less than 2mm after crushing and screening construction demolition wastes.
In the preparation method of the present invention, the pretreatment means: drying fine aggregate smaller than 2mm, pouring the dry fine aggregate into water doped with sulfamate water reducer, soaking and stirring the dry fine aggregate, and then taking out the dry fine aggregate, standing and aging the dry fine aggregate until the water content is stabilized within the range of 15-25%.
In the preparation method, the fine aggregate with the water content of less than 2mm is dried until the water content is less than or equal to 0.5 percent; the concentration of the sulfamate water reducer in the water doped with the sulfamate water reducer is 0.3-0.6%; soaking and stirring for 3-10 min; the aging time is more than 1 day.
The GRC decorative curtain wall board manufactured by using the low-quality recycled fine aggregate and the preparation method thereof have the following beneficial effects: according to the GRC decorative curtain wall board manufactured by using the low-quality recycled fine aggregate and the preparation method thereof, the GRC decorative curtain wall board is manufactured by using the low-quality recycled fine aggregate, so that the application range of the low-quality recycled fine aggregate is expanded, the utilization rate of construction demolition waste is improved, and good environmental benefit, economic benefit and social benefit are achieved.
Detailed Description
The GRC decorative curtain wall panel made of low-quality recycled fine aggregate and the preparation method thereof according to the present invention will be further described with reference to the following examples:
the invention relates to a GRC decorative curtain wall board made of low-quality recycled fine aggregate, which comprises the following components in parts by weight: 800 parts of low-alkalinity sulphoaluminate cement, 1400 parts of recycled fine aggregate, 10-40 parts of polycarboxylic acid water reducing agent and 2-4 parts of alkali-resistant glass fiber.
Adding 100-200 parts of water into the components in parts by mass, mixing and stirring to a uniform state, namely mixing and stirring 100-200 parts of water, 400-800 parts of low-alkalinity sulphoaluminate cement, 1000-1400 parts of recycled fine aggregate, 10-40 parts of polycarboxylic acid water reducer and 2-4 parts of alkali-resistant glass fiber according to parts by mass, putting into a mold, carrying out vibration molding, and demolding after curing for 4-24 hours to obtain the GRC decorative curtain wall board.
Preferably, the GRC decorative curtain wall board comprises the following components in parts by weight: 650 parts of low-alkalinity sulphoaluminate cement 550-.
Adding 130-170 parts of water into the components with the optimal mass part ratio, mixing and stirring the mixture to a uniform state, namely mixing and stirring 130-170 parts of water, 550-650 parts of low-alkalinity sulphoaluminate cement, 1150-1300 parts of recycled fine aggregate, 20-30 parts of polycarboxylic acid water reducer and 2.5-3 parts of alkali-resistant glass fiber according to the mass part ratio to a uniform state, putting the mixture into a mold, carrying out vibration molding, carrying out curing for 4-24h, and then demolding to obtain the GRC decorative curtain wall board.
It should be noted that the low alkalinity sulphoaluminate cement may be 32.5, 42.5, 52.5 and other types of cement.
The recycled fine aggregate is obtained by pretreating fine aggregate smaller than 2mm after crushing and screening construction demolition waste. That is, the construction demolition waste is crushed and screened to obtain fine aggregate smaller than 2mm, and then is pretreated to obtain the recycled fine aggregate.
The pretreatment is as follows: drying fine aggregate with the water content of less than 2mm to the water content of less than or equal to 0.5 percent, pouring the fine aggregate into water doped with 0.3 to 0.6 percent of sulfamate water reducer, soaking and stirring the fine aggregate for 3 to 10min, transferring the fine aggregate out of a transfer bin and the like, and standing and aging the fine aggregate for more than 1 day until the water content is stabilized within the range of 15 to 25 percent, preferably 18 percent.
The term "the water content of the fine aggregate having a water content of less than 2mm is dried to a water content of 0.5% or less" means that the water content of 0.5g or less per 100g of the fine aggregate having a water content of less than 2 mm. The water content in the "water content stabilized in the range of 15% to 25%" means that the water content per 100g of the recycled fine aggregate is in the range of 15g to 25 g. "Water doped with 0.3 to 0.6% of sulfamate-based water reducing agent" means that the sulfamate-based water reducing agent is contained in an amount of 0.3 to 0.6g per 100ml of water. By immersing the fine aggregate into the water mixed with the additive, the open pores in the aggregate are filled with water containing the high-concentration additive, so that the additive in the mixing water can not diffuse into the open pores of the aggregate but gradually diffuse into the mixing water due to concentration difference in the mixing process of the low-quality recycled aggregates, and the slump loss of concrete is reduced.
The volume density of the GRC decorative curtain wall board prepared by the method is 1700-2200 kg/m3(ii) a The compressive strength of the GRC decorative curtain wall board is 40-80MPa; the bending strength limit of the GRC decorative curtain wall plate is 8-14 MPa; the ultimate tensile strength is 3-7 MPa.
The GRC decorative curtain wall board is manufactured by utilizing the low-quality recycled fine aggregate through a certain pretreatment process, and a new direction is provided for the application of the low-quality recycled fine aggregate.
The GRC decorative curtain wall board mainly uses fine aggregate with the particle size of less than 2mm, and the water absorption rate fluctuates in a large range of about 10-25% according to the amount of clay brick scraps contained in the fine aggregate, so that the working performance of the GRC is greatly influenced. In addition, in the hardening process of the GRC, moisture absorbed into pores of the aggregate during mixing can seep back to the interface of the slurry and the aggregate, so that the compressive strength and the tensile strength of the GRC are influenced. However, after the fine aggregate with the particle size of less than 2mm is pretreated, the water absorption change caused by the quality fluctuation of the fine aggregate can be avoided, the workability of the GRC is ensured, and meanwhile, because the sulfamate water reducing agent is adsorbed in the pores of the regenerated fine aggregate in advance, the concentration difference of water in the pores of the aggregate and the GRC slurry can be avoided, the back penetration of pore water is reduced, the increase of the water-cement ratio of the slurry-aggregate interface is improved, and the compressive strength and the tensile strength of the GRC are improved.
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
(1) The raw material mixing ratios of examples 1 to 3 are shown in Table 1.
Table 1: raw material ratio of GRC decorative curtain wall board
(2) Weighing the raw materials according to the proportion, mixing and stirring the raw materials to be in a uniform state, putting the mixture into a mould, carrying out vibration forming, and demoulding after curing to obtain the GRC decorative curtain wallboard;
among them, the pretreatment of the recycled fine aggregate in examples 1 to 3 was as follows: drying fine aggregate with the water content of less than 2mm until the water content is less than or equal to 0.5 percent, pouring the fine aggregate into water doped with 0.5 percent of sulfamate water reducer, soaking and stirring the fine aggregate for 8min, transferring the fine aggregate out of a transfer bin and the like, and standing and aging the fine aggregate for more than 1 day until the water content is stabilized within the range of 15 to 25 percent;
the pretreatment of the recycled fine aggregate in examples 4 to 5 was as follows: drying fine aggregate with the water content of less than 2mm to the water content of less than or equal to 0.5 percent, pouring the fine aggregate into water doped with 0.3 percent of sulfamate water reducer, soaking and stirring the fine aggregate for 3min, transferring the fine aggregate out of a transfer bin and the like, and standing and aging the fine aggregate for more than 1 day until the water content is stabilized within the range of 15 to 25 percent;
the pretreatment of the recycled fine aggregate in examples 6 to 7 was as follows: drying fine aggregate with the water content of less than 2mm until the water content is less than or equal to 0.5 percent, pouring the fine aggregate into water doped with 0.6 percent of sulfamate water reducer, soaking and stirring the fine aggregate for 10min, transferring the fine aggregate out of a transfer bin, and the like, standing and aging the fine aggregate for more than 1 day until the water content is stabilized within the range of 15 to 25 percent;
(3) the performance index of the GRC decorative curtain wall board is detected, and the result is shown in Table 2.
Table 2: performance index detection result for GRC decorative curtain wall board
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. The GRC decorative curtain wall board made of the low-quality recycled fine aggregate is characterized by comprising the following components in parts by mass: 800 parts of low-alkalinity sulphoaluminate cement, 1400 parts of recycled fine aggregate, 10-40 parts of polycarboxylic acid water reducing agent and 2-4 parts of alkali-resistant glass fiber;
the recycled fine aggregate is obtained by pretreating fine aggregate smaller than 2mm after crushing and screening construction demolition waste; the pretreatment is as follows: drying fine aggregate smaller than 2mm, pouring the dry fine aggregate into water doped with sulfamate water reducer, soaking and stirring the dry fine aggregate, transferring the dry fine aggregate out, standing and aging the dry fine aggregate until the water content is stabilized within the range of 15-25%.
2. The GRC decorative curtain wall panel of claim 1, comprising the following components in parts by mass: 650 parts of low-alkalinity sulphoaluminate cement 550-.
3. The GRC decorative curtain wall panel of claim 1, wherein fine aggregate of less than 2mm is dried to a moisture content of less than or equal to 0.5%; the concentration of the sulfamate water reducer in the water doped with the sulfamate water reducer is 0.3-0.6%; soaking and stirring for 3-10 min; the aging time is more than 1 day.
4. A preparation method of a GRC decorative curtain wall board made of low-quality recycled fine aggregate is characterized in that 800 parts by mass of low-alkalinity sulphoaluminate cement, 1400 parts by mass of recycled fine aggregate, 10-40 parts by mass of polycarboxylic acid water reducer and 2-4 parts by mass of alkali-resistant glass fiber are added with 200 parts by mass of water, mixed and stirred to a uniform state, placed in a mold, vibrated and molded, and demoulded after maintenance to prepare the GRC decorative curtain wall board;
the recycled fine aggregate is obtained by pretreating a fine aggregate smaller than 2mm after crushing and screening construction demolition waste, wherein the pretreatment is as follows: drying fine aggregate smaller than 2mm, pouring the dry fine aggregate into water doped with sulfamate water reducer, soaking and stirring the dry fine aggregate, transferring the dry fine aggregate out, standing and aging the dry fine aggregate until the water content is stabilized within the range of 15-25%.
5. The method of claim 4, wherein the curing time is 4 to 24 hours.
6. The method according to claim 4, wherein the fine aggregate of less than 2mm is dried to a moisture content of 0.5% or less; the concentration of the sulfamate water reducer in the water doped with the sulfamate water reducer is 0.3-0.6%; soaking and stirring for 3-10 min; the aging time is more than 1 day.
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| CN110563414B (en) * | 2019-10-28 | 2022-01-25 | 中国十七冶集团有限公司 | Preparation and construction method of separated concrete for CCW heat-preservation curtain wall |
| CN111548104A (en) * | 2020-06-01 | 2020-08-18 | 中国建材检验认证集团北京天誉有限公司 | Low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement |
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| KR100694199B1 (en) * | 2006-03-27 | 2007-03-14 | 주식회사 알인텍 | Method for preparing the insulation panel having thermal resistance |
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