CN113321480B - Waste fiber recycled concrete and preparation method and application thereof - Google Patents
Waste fiber recycled concrete and preparation method and application thereof Download PDFInfo
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- CN113321480B CN113321480B CN202110732166.2A CN202110732166A CN113321480B CN 113321480 B CN113321480 B CN 113321480B CN 202110732166 A CN202110732166 A CN 202110732166A CN 113321480 B CN113321480 B CN 113321480B
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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
- C04B28/14—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 calcium sulfate cements
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2111/40—Porous or lightweight materials
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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
- 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
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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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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of construction waste regeneration, in particular to waste fiber regenerated concrete and a preparation method and application thereof, wherein the waste fiber regenerated concrete is prepared from the following raw materials in parts by weight: 953-1080 parts of coarse aggregate, 728-813 parts of fine aggregate, 340-490 parts of cementing material, 3-6 parts of foaming agent, 6.8-8.33 parts of water reducing agent, 11-15 parts of modified fiber, 35-40 parts of slag and 200-250 parts of water. According to the invention, waste polyester textiles are used as raw materials, modified fibers are obtained by modifying the waste polyester textiles, and excellent water absorption and water permeation effects are realized while the mechanical property of concrete is ensured by adopting the modified fibers.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to waste fiber recycled concrete and a preparation method and application thereof.
Background
Along with the development in city, the city road surface is great pressure to the plumbing after heavy rain, the view of city ocean often appears, and it is more and more complicated that the reason is main still city municipal pipe network to follow it, and the drainage is not timely enough, and the drainage effect is also poor. In recent years, foam concrete is more popular in urban water supply and drainage, the foam concrete is a novel light heat-insulating material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing foam and cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine, and carrying out natural curing. However, the permeable foam concrete has high continuous porosity, so that the connection between the hole walls is not tight, and the strength of the concrete is often low.
China is a textile consumption market which is rapidly increased in the world, is also the largest world textile and clothing producing country and export country, and generates a large amount of waste textiles such as old clothes every year, however, at present, china is still in a primary stage in the aspect of recycling of the waste textiles, the recycling rate of the waste textiles is low, and particularly a recycling system is urgently needed to be perfected. The total amount of fiber processing in China is more than 5000 ten thousand tons every year, wherein the proportion of chemical fibers reaches about 84%, the specific gravity of terylene in the chemical fibers is about 80%, the social reserve of waste chemical fiber textiles in China is nearly 4 hundred million tons, the waste materials in the production and processing processes are more than 400 ten thousand tons per year, the used and scrapped fiber products are more than 800 ten thousand tons per year, and the resource recovery and utilization rate is less than 10%, so that the utilization level and the specific gravity of the waste textiles in China are improved as soon as possible, the huge environmental pressure caused by the undegradability of the waste textiles can be solved, and the contradiction that the chemical fiber raw material petroleum resources in China are in short supply can be relieved or even solved.
The terylene fabrics in the chemical fiber can be widely applied because of the advantages that other fabrics cannot replace the terylene fabrics, such as: (1) The strength of the fiber is high, the strength of the short fiber is 2.6-5.7 cN/dtex, and the strength of the high-strength fiber is 5.6-8.0 cN/dtex; (2) The elasticity is super strong, the elasticity is close to that of wool, the wool can be almost completely recovered when the wool is stretched by 5 to 6 percent, and the elastic modulus is 22 to 141cN/dtex; (3) the heat resistance is good; (4) the light resistance is better; (5) the wear resistance is good; (6) The chemical resistance is good, and the damage degree of acid and alkali is not large; therefore, if the waste polyester textiles can be applied to concrete, not only is the secondary utilization of wastes realized, but also the problem of environmental pollution caused by the waste polyester textiles is effectively solved.
Although the terylene textile has the advantages, the terylene textile has certain defects, the terylene is the trade name of the polyethylene terephthalate fiber, and because the linear macromolecules of the terylene have a symmetrical benzene ring structure, good linearity and a stereo regular macromolecule chain structure, two ends of the molecule of the terylene textile are only provided with one hydroxyl respectively, no other hydrophilic groups are provided, the molecule chain structure is compact, the crystallinity and the orientation degree are both high, and the terylene textile is a typical hydrophobic fiber, so the terylene textile has poor hygroscopicity and the moisture absorption rate of only 0.4 percent, and if the terylene textile is applied to concrete in a large amount, the terylene textile brings adverse effect to municipal drainage.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide recycled aggregate concrete and a preparation method and application thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the waste fiber recycled concrete is prepared from the following raw materials in parts by weight: 953-1080 parts of coarse aggregate, 728-813 parts of fine aggregate, 340-490 parts of cementing material, 3-6 parts of foaming agent, 6.8-8.33 parts of water reducing agent, 11-15 parts of modified fiber, 35-40 parts of slag and 200-250 parts of water.
Preferably, the raw material also comprises 13-15 parts of polyacrylonitrile fiber, and the length of the polyacrylonitrile fiber is 5-10mm.
Preferably, the cementing material is composed of the following raw materials in percentage by mass: 74-80% of cement, 10-14% of fly ash and 10-13% of gypsum; the cement is P.O42.5 portland cement, and the fly ash is II-grade F-type low-calcium fly ash.
Preferably, the foaming agent is composed of the following raw materials in percentage by mass: 50-65% of foaming agent, 20-27% of foam stabilizer and 8-30% of air entraining agent.
Preferably, the modified fiber is prepared according to the following steps:
s1, mixing the waste polyester textiles with a swelling agent, stirring for 0.5-1h at 70-85 ℃, and cleaning to obtain a swelling textile;
wherein the mass ratio of the waste polyester textiles to the swelling agent is 100-150:4-8;
s2, placing the swollen textile obtained in the step S1 into an emulsifier aqueous solution, adding a hydrophilic finishing agent, stirring at 80-100 ℃ for 1.5-4h, and drying to obtain a modified textile;
wherein the ratio of the mass of the swollen textile to the volume of the emulsifier and the mass of the hydrophilic finishing agent is 100-150g:5-10mL:6-10g;
and S3, crushing the modified textile obtained in the step S2 to obtain modified fibers, wherein the length of the modified fibers is 1.5-4cm.
Preferably, the swelling agent of step S1 is chlorobenzene or m-cresol or a mixture of the two.
Preferably, the emulsifier in step S2 is AOE9, tween 20, tween 60 or tween 80, and the hydrophilic treatment agent is a polysiloxane hydrophilic treatment agent, a polyurethane hydrophilic treatment agent, a polyacrylate hydrophilic treatment agent or a chitosan hydrophilic treatment agent.
The invention also protects a preparation method of the waste fiber recycled concrete, which comprises the following steps:
(1) Weighing: weighing the following raw materials in parts by weight: 953-1080 parts of coarse aggregate, 728-813 parts of fine aggregate, 340-490 parts of cementing material, 3-6 parts of foaming agent, 6.8-8.33 parts of water reducing agent, 11-15 parts of modified fiber, 35-40 parts of slag and 200-250 parts of water for later use;
(2) Mixing and uniformly stirring coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, modified fiber, slag and water, quickly paving the mixture on a construction surface, and curing the mixture to form the formed waste fiber recycled concrete.
Preferably, 13-15 parts of polyacrylonitrile fiber is also weighed in the step (1) and added into the step (2).
The invention also protects the application of the waste fiber recycled concrete in preparing the road engineering water permeable material.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention carries out technical modification on waste polyester textiles, and the specific method comprises the following steps: the waste polyester textiles are swelled by adopting the swelling agent firstly, so that the polyester textiles with compact structures are loosened, and then the other modifiers are promoted to diffuse into the polyester textiles, so that the attachment areas of the other modifiers are increased, the higher moisture absorption rate is obtained, and the moisture absorption of the waste polyester textiles is facilitated under the action of the swelling agent, and the result shows that the moisture absorption rate is obviously increased under the action of chlorobenzene or m-cresol, and is increased to 6-7% from the moisture absorption rate of 0.4-0.5%.
After swelling, performing hydrophilic treatment on the swollen textile, wherein the specific treatment method comprises the following steps: the swelling textile is added into the emulsifier water solution, and the emulsifier has both oleophilic groups and hydrophilic groups, so that the emulsifier promotes the mixing of the swelling textile and the hydrophilic treatment agent, and the hydrophilic treatment agent is uniformly and firmly covered on the surface of the polyester fiber to form a hydrophilic film, thereby improving the hydrophilic performance of the polyester; and then in the heating process, the co-crystallization phenomenon is generated between the hydrophilic treatment agent and the surface of the terylene, so that the surface of the waste terylene textile is rich in hydrophilic groups, and the aim of moisture absorption is fulfilled.
2. The modified fiber is applied to concrete, the concrete comprises coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, the modified fiber, slag and water, the cementing material and the modified fiber are used for improving the strength of the concrete, the foaming agent and the slag are used for forming a large number of closed air holes to facilitate water permeation, and meanwhile the modified fiber has a water absorption effect, so that the excellent water absorption and water permeation effects are realized while the mechanical property of the concrete is ensured.
In addition, the cementing material comprises gypsum, slag and cement, and the hydration products of the gypsum, the slag and the cement form a C-H-S amorphous gel structure, so that the mechanical property of the concrete is improved.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. The experimental methods described in the examples of the present invention are all conventional methods unless otherwise specified.
Example 1
A preparation method of waste fiber recycled concrete comprises the following steps:
(1) Preparing modified fibers:
s1, dissolving 100g of waste polyester textiles and 4g of chlorobenzene swelling agent into 100mL of water, stirring for 1 hour at 70 ℃, and cleaning to obtain swelling textiles;
s2, adding 100g of the swollen textile obtained in the step S1 into an aqueous solution containing 5mL of Tween 20, adding 10g of polysiloxane hydrophilic treatment agent, stirring at 80 ℃ for 4h, and drying to obtain a modified textile;
s3, crushing the modified textile obtained in the step S2 to obtain modified fibers, wherein the length of each modified fiber is 1.5cm;
(2) Weighing: weighing the following raw materials in parts by weight: 953 parts of coarse aggregate, 813 parts of fine aggregate, 340 parts of cementing material, 6 parts of foaming agent, 6.8 parts of water reducing agent, 11 parts of modified fiber, 40 parts of slag and 200 parts of water for later use;
the cementing material is composed of the following raw materials in percentage by mass: 80% of cement, 10% of fly ash and 10% of gypsum;
the foaming agent is prepared from the following raw materials in percentage by mass: 65% of foaming agent, 27% of foam stabilizer and 8% of air entraining agent;
(3) Mixing and uniformly stirring coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, modified fiber, slag and water, quickly paving to a construction surface, and curing to form the formed waste fiber recycled concrete.
Example 2
A preparation method of waste fiber recycled concrete comprises the following steps:
(1) Preparing modified fibers:
s1, dissolving 120g of waste polyester textiles and 6g of m-cresol swelling agent into 100mL of water, stirring for 45min at 80 ℃, and cleaning to obtain swollen textiles;
s2, adding 120g of the swollen textile obtained in the step S1 into an aqueous solution containing 8mL of Tween 60, adding a polyurethane hydrophilic treatment agent, stirring at 90 ℃ for 2.5h, and drying to obtain a modified textile;
s3, crushing the modified textile obtained in the step S2 to obtain modified fibers, wherein the length of each modified fiber is 3cm;
(2) Weighing: weighing the following raw materials in parts by weight: 1000 parts of coarse aggregate, 800 parts of fine aggregate, 400 parts of cementing material, 5 parts of foaming agent, 7 parts of water reducing agent, 12 parts of modified fiber, 38 parts of slag and 230 parts of water for later use;
the cementing material is composed of the following raw materials in percentage by mass: 75% of cement, 12% of fly ash and 13% of gypsum;
the foaming agent is prepared from the following raw materials in percentage by mass: 60% of foaming agent, 20% of foam stabilizer and 20% of air entraining agent;
(3) Mixing and uniformly stirring coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, modified fiber, slag and water, quickly paving the mixture on a construction surface, and curing the mixture to form the formed waste fiber recycled concrete.
Example 3
A preparation method of waste fiber recycled concrete comprises the following steps:
(1) Preparing modified fibers:
s1, dissolving 150g of waste polyester textiles and 8g of mixed swelling agent of chlorobenzene and m-cresol into 150mL of water, stirring at 85 ℃ for 0.5h, and cleaning to obtain swelling textiles;
s2, adding 150g of the swollen textile obtained in the step S1 into 10mL of AOE 9-containing aqueous solution, adding 6g of chitosan hydrophilic treatment agent, stirring at 100 ℃ for 1.5h, and drying to obtain a modified textile;
s3, crushing the modified textile obtained in the step S2 to obtain modified fibers, wherein the length of each modified fiber is 4cm;
(3) Weighing: weighing the following raw materials in parts by weight: 1080 parts of coarse aggregate, 728 parts of fine aggregate, 490 parts of cementing material, 3 parts of foaming agent, 8.33 parts of water reducing agent, 15 parts of modified fiber, 35 parts of slag and 250 parts of water for later use;
the cementing material is composed of the following raw materials in percentage by mass: 74% of cement, 13% of fly ash and 13% of gypsum;
the foaming agent is composed of the following raw materials in percentage by mass: 50% of foaming agent, 20% of foam stabilizer and 30% of air entraining agent;
(3) Mixing and uniformly stirring coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, modified fiber, slag and water, quickly paving to a construction surface, and curing to form the formed waste fiber recycled concrete.
Example 4
A preparation method of waste fiber recycled concrete comprises the following steps:
(1) Preparing modified fibers:
s1, dissolving 120g of waste polyester textiles and 6g of m-cresol swelling agent into 100mL of water, stirring for 45min at 80 ℃, and then cleaning to obtain swelling textiles;
s2, adding 120g of the swollen textile obtained in the step S1 into an aqueous solution containing 8mL of Tween 60, adding a polyurethane hydrophilic treatment agent, stirring at 90 ℃ for 2.5h, and drying to obtain a modified textile;
s3, crushing the modified textile obtained in the step S2 to obtain modified fibers, wherein the length of each modified fiber is 3cm;
(2) Weighing: weighing the following raw materials in parts by weight: 1000 parts of coarse aggregate, 800 parts of fine aggregate, 400 parts of cementing material, 5 parts of foaming agent, 7 parts of water reducing agent, 12 parts of modified fiber, 38 parts of slag, 230 parts of water and 14 parts of polyacrylonitrile fiber for later use;
the cementing material is composed of the following raw materials in percentage by mass: 75% of cement, 12% of fly ash and 13% of gypsum;
the foaming agent is prepared from the following raw materials in percentage by mass: 60% of foaming agent, 20% of foam stabilizer and 20% of air entraining agent;
(3) Mixing and uniformly stirring coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, modified fiber, polyacrylonitrile fiber, slag and water, quickly paving the mixture on a construction surface, and curing the mixture to form the formed waste fiber recycled concrete.
Comparative example 1
The same procedure as in example 2 was followed except that no modified fiber was added.
The waste fiber recycled concrete which ensures the mechanical property of the concrete and simultaneously realizes excellent water absorption and water permeation effects is prepared in the examples 1 to 3 of the invention, the effects are parallel, the concrete prepared in the examples 1 to 3 and the comparative examples 1 and 4 is contrastively analyzed, a standard test block of 150mm multiplied by 150mm is formed by a flat plate vibrator, the test is carried out after 28 days of maintenance, and the test scheme of the compressive strength and the flexural strength is carried out according to the standard GB/T50081 of the test method of the mechanical property of the common concrete; the porosity and the water permeability coefficient refer to a gravimetric method and a water head fixing method introduced in permeable concrete and application technology thereof (edited by sonzhongnan et al, published by the Chinese construction industry, 2011.8); specific results are shown in table 1:
TABLE 1 comparison of Properties of waste fiber recycled concrete
Compared with the embodiment 2, the embodiment 4 has the advantages that the polyacrylonitrile fiber is added on the basis of the embodiment 2, the mechanical property of the waste fiber recycled concrete is effectively improved after the polyacrylonitrile fiber and the cementing material are blended, but the water permeability coefficient and the porosity are both reduced to a certain degree, but the water permeability coefficient of the embodiment 4 is more than or equal to 0.5, the porosity is 11-17, the standard of the pervious concrete is met, and the excellent mechanical property is realized, and the result shows that the waste fiber recycled concrete with better mechanical property and water permeability is prepared after the polyacrylonitrile fiber is added.
Compared with the examples 1-3, the water permeability coefficient, the porosity, the compressive strength and the flexural strength of the recycled concrete are not greatly different, and the results show that the prepared recycled concrete made of the waste fibers has excellent water permeability and mechanical properties;
compared with the comparative example 1, in the example 2, after the modified fiber is not added, the water permeability coefficient and the porosity are not obviously improved, but the mechanical property is obviously reduced, which indicates that the water permeability is influenced before and after the modified fiber is added, but the influence is not large, namely, the polyester fiber has certain water absorption in concrete due to modification, so the water permeability of the polyester fiber to the concrete is not obvious any more; and because of not adding modified fiber, lead to producing huge influence to mechanical properties, the result has also shown that this application has carried out effective modification to polyester fiber to regard it as the addition material and be used for promoting the mechanical properties of concrete.
And (3) durability test:
placing the standard test block in a composite salt solution to carry out a dry-wet alternation test, wherein the dry-wet alternation operation comprises the following steps: na (Na) 2 SO 4 -MgSO 4 Soaking in NaCl compound salt solution for 15h, airing indoors for 1h, drying at 60 ℃ for 7h, and cooling indoors for 1h, wherein the total time is 24h; testing the pH value of the compound salt solution by using a handheld pH meter every 7 days, adjusting the pH value of the solution to 7.0 +/-0.5 by using analytically pure concentrated sulfuric acid, and replacing the solution every 30 days; after the standard test block is dried and wetted for 180 times alternately, the standard test block is dried for 48 hours at the temperature of 60 ℃, the dynamic elastic modulus, the quality, the compressive strength and the splitting tensile strength of the standard test block are tested again, and the relative value of each index is calculated; durability of waste fiber recycled concrete meansThe indices are shown in table 2:
TABLE 2 durability index of waste fiber recycled concrete
The results show that compared with the corresponding physical and mechanical property indexes of the standard test block of the non-eroded recycled concrete, the mechanical property and the relative dynamic elastic modulus of the waste fiber recycled concrete eroded for a long time have certain losses, after 180 times of alternation of dry and wet, the mechanical property of the waste fiber recycled concrete prepared in the embodiments 2 and 4 of the invention is reduced, but the performance reduction is not obvious, which shows that the waste fiber recycled concrete prepared in the embodiments 2 and 4 of the invention has better corrosion resistance, which is obviously superior to the comparative example 1, which also shows that the mechanical property of the concrete is improved after the modified fiber and the polyacrylonitrile fiber are added, and the corrosion resistance of the concrete is improved, which shows that the modified fiber and the polyacrylonitrile fiber have positive effects on the corrosion resistance of the waste fiber recycled concrete.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. The waste fiber recycled concrete is characterized by comprising the following raw materials in parts by weight: 953-1080 parts of coarse aggregate, 728-813 parts of fine aggregate, 340-490 parts of cementing material, 3-6 parts of foaming agent, 6.8-8.33 parts of water reducing agent, 11-15 parts of modified fiber, 35-40 parts of slag, 200-250 parts of water and 13-15 parts of polyacrylonitrile fiber, wherein the length of the polyacrylonitrile fiber is 5-10mm;
the cementing material is composed of the following raw materials in percentage by mass: 74-80% of cement, 10-14% of fly ash and 10-13% of gypsum; the cement is P.O42.5 portland cement, and the fly ash is II-grade F-type low-calcium fly ash;
the foaming agent is composed of the following raw materials in percentage by mass: 50-65% of foaming agent, 20-27% of foam stabilizer and 8-30% of air entraining agent;
the waste fiber recycled concrete is characterized in that the modified fiber is prepared according to the following steps:
s1, placing waste polyester textiles into a swelling agent, stirring for 0.5-1h at 70-85 ℃, and then cleaning to obtain swelling textiles, wherein the swelling agent is chlorobenzene or m-cresol or a mixture of chlorobenzene and m-cresol;
wherein the mass ratio of the waste polyester textiles to the swelling agent is 100-150:4-8;
s2, placing the swollen textile obtained in the step S1 into an emulsifier aqueous solution, adding a hydrophilic finishing agent, stirring at 80-100 ℃ for 1.5-4h, and drying to obtain a modified textile, wherein the emulsifier is AOE9, tween 20, tween 60 or Tween 80, and the hydrophilic finishing agent is a polysiloxane hydrophilic finishing agent, a polyurethane hydrophilic finishing agent, a polyacrylate hydrophilic finishing agent or a chitosan hydrophilic finishing agent;
wherein the ratio of the mass of the swollen textile to the volume of the emulsifier and the mass of the hydrophilic finishing agent is 100-150g:5-10mL:6-10g;
and S3, crushing the modified textile obtained in the step S2 to obtain modified fibers, wherein the length of the modified fibers is 1.5-4cm.
2. A method for preparing the waste fiber recycled concrete of claim 1, comprising the steps of:
(1) Weighing: weighing the following raw materials in parts by weight: 953-1080 parts of coarse aggregate, 728-813 parts of fine aggregate, 340-490 parts of cementing material, 3-6 parts of foaming agent, 6.8-8.33 parts of water reducing agent, 11-15 parts of modified fiber, 35-40 parts of slag and 200-250 parts of water for later use;
(2) Mixing and uniformly stirring coarse aggregate, fine aggregate, a cementing material, a foaming agent, a water reducing agent, modified fiber, slag and water, quickly paving the mixture on a construction surface, and curing the mixture to form the formed waste fiber recycled concrete.
3. The method for preparing waste fiber recycled concrete according to claim 2, wherein 13-15 parts of polyacrylonitrile fiber is further weighed in the step (1) and added to the step (2).
4. Use of the waste fiber recycled concrete of claim 1 in the preparation of road engineering water permeable materials.
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| CN113942098A (en) * | 2021-11-07 | 2022-01-18 | 福建师范大学 | Method for enhancing regenerated artificial stone by modifying and opening fibers through waste textiles |
| CN114014566A (en) * | 2021-11-29 | 2022-02-08 | 盐城工业职业技术学院 | Method for preparing regenerated cementing material by using waste concrete |
| CN115849832B (en) * | 2022-12-30 | 2024-04-02 | 和县飞竣新型建材有限公司 | Cement-based prefabricated brick with high water permeability and preparation method thereof |
| CN117428890A (en) * | 2023-10-10 | 2024-01-23 | 安徽空间智筑技术有限公司 | Preparation method for preparing 3D printing concrete by using waste textiles and concrete |
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