CN116102323B - High-ductility concrete based on modified waste PCB coarse particles and preparation method thereof - Google Patents
High-ductility concrete based on modified waste PCB coarse particles and preparation method thereof Download PDFInfo
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- CN116102323B CN116102323B CN202310386876.3A CN202310386876A CN116102323B CN 116102323 B CN116102323 B CN 116102323B CN 202310386876 A CN202310386876 A CN 202310386876A CN 116102323 B CN116102323 B CN 116102323B
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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
Abstract
The invention provides a high-ductility concrete based on modified waste PCB coarse particles and a preparation method thereof, wherein the preparation method comprises the following steps: (1) Adding 350-500 parts by weight of cement, 350-450 parts by weight of river sand, 50-100 parts by weight of slag, 0.3-1.0 part by weight of cellulose ether, 1.2-1.8 parts by weight of water reducer and 0.6-1.2 parts by weight of dispersing agent into stirring equipment, and uniformly stirring; (2) continuously adding 40-60 parts by weight of water and stirring; (3) Adding 10-50 parts by weight of modified waste PCB coarse particles, and stirring; continuously adding 4-8 parts by weight of organic fibers and stirring; and adding 140-180 parts by weight of water, and stirring to obtain the high-ductility concrete. The high-ductility concrete prepared by the method can be applied to roads, bridges and large-scale buildings, has the characteristics of simple production, high strength, good toughness, environmental friendliness and convenience in popularization and use.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to modified waste PCB coarse particle-based high-ductility concrete and a preparation method thereof.
Background
Since the advent of cement, mortar and concrete materials have been produced, concrete is one of the most important materials for construction engineering, and has the advantages of wide application, abundant raw materials, simple preparation, excellent performance and the like. Concrete is a brittle material with high compressive strength and low tensile strength, and along with the continuous development of modern building technology, higher requirements are put on the concrete, and the concrete is developing towards high strength, high toughness, high crack resistance, high durability and excellent workability.
Compared with the existing common concrete, the high-ductility concrete has the excellent characteristics of low brittleness, high toughness, high strength, strong stress resistance, ultrahigh durability and the like. However, the fibers are unevenly dispersed in the concrete, such as macroscopic fracture caused by stress concentration due to aggregation of the fibers in the mortar, the combination of the fiber surface and the mortar is insufficient, the fibers cannot play a role of fiber bridging after being stressed, and the like, so that the strength is reduced, the brittleness is not improved, and the problem of poor building durability is aggravated. At present, the excellent performance of high-ductility concrete cannot be achieved by simply adding fibers to the concrete.
With mass production of electronic products and the increasing reject cycles, the number of discarded printed circuit boards ((printed circuit board, PCB)) is also increasing dramatically. Therefore, electronic pollution caused by discarding the PCB has become a serious environmental problem. The recycling technology of the metal materials in the waste PCBs has been developed to be mature, and a large part of the non-metal materials are discarded, burned or buried as garbage, which not only causes serious environmental pollution, but also causes a great waste of useful resources. In the prior art, the waste printed circuit board is directly applied to the building material, so that the performance improvement effect is not ideal; meanwhile, some processes for modifying the waste printed circuit board are very complex, have no universality and have great operation difficulty in practical application.
Disclosure of Invention
The invention aims to provide high-ductility concrete based on modified waste PCB coarse particles and a preparation method thereof, wherein the modified waste PCB coarse particles are mixed and stirred with various raw materials to obtain a concrete material with excellent performance, and the concrete material is used for relieving environmental pollution caused by waste PCB and performance defects of current concrete mortar.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of high-ductility concrete based on modified waste PCB coarse particles, which comprises the following steps:
(1) Adding 350-500 parts by weight of cement, 350-450 parts by weight of river sand, 50-100 parts by weight of slag, 0.3-1.0 part by weight of cellulose ether, 1.2-1.8 parts by weight of water reducer and 0.6-1.2 parts by weight of dispersing agent into stirring equipment, and uniformly stirring;
(2) Continuously adding 40-60 parts by weight of water, and stirring to obtain a concrete initial material;
(3) Adding 10-50 parts by weight of modified waste PCB coarse particles into the concrete initial material in the step (2), and stirring; continuously adding 4-8 parts by weight of organic fibers, and continuously stirring; and adding 140-180 parts by weight of water, and stirring to obtain the high-ductility concrete.
Further, the modified waste PCB coarse particles in the step (3) are prepared according to the following steps:
(a) Crushing the waste PCB after metal recovery to obtain coarse particles of the waste PCB;
(b) Pouring the waste PCB coarse particles into HCl solution for soaking;
(c) And washing, filtering and airing the soaked coarse particles of the waste PCB to obtain the modified coarse particles of the waste PCB.
The micro burrs exist on the microstructure of the coarse particle surface of the waste PCB obtained through crushing treatment, but the surface is smooth. The surface of the modified waste PCB coarse particles is rough, the interface effect and the friction force are stronger, and when the modified waste PCB coarse particles are stirred with the organic fibers, the friction dispersion effect on the fibers can be achieved, and the dispersion of the organic fibers is facilitated. Meanwhile, the surface area of the modified PCB coarse particles is larger, the contact area with various raw materials is larger, and the mechanical strength, toughness, crack resistance and volume stability of the high-ductility concrete are improved.
Further, the number of coarse particles of the modified waste PCB is 30-50 meshes, and the modified waste PCB is in the shape of a strip.
Wherein, modified abandonment PCB board coarse grain is 30 mesh-50 mesh, and the shape is the strip thing, more is favorable to its bridge play the linking effect as between the raw materials, and friction dispersion effect is better simultaneously.
Further, the HCl solution is hydrochloric acid aqueous solution with the concentration of 1.0 mol/L-2.0 mol/L.
The hydrochloric acid aqueous solution is used for carrying out etching roughening treatment on the coarse particles of the PCB, so that the problems of great operation difficulty and high cost in practical application when organic matters are used for modification in the prior art are solved. The modification method is simple and easy to operate, and the production cost is greatly reduced. Furthermore, the invention uses the hydrochloric acid aqueous solution with the concentration of 1.0 mol/L-2.0 mol/L to carry out etching roughening, so that the particles have the rough surface with microstructure, and the obtained modified waste PCB has more excellent rough particle performance. The PCB coarse particles comprise components such as epoxy resin, glass fiber and the like, and a cavity is formed on the surface of the PCB coarse particles after acid etching, so that the PCB coarse particles have a similar anchoring effect, and the binding force between the PCB coarse particles and the interfaces of the rest raw materials is increased.
Further, adding modified waste PCB coarse particles into the step (3), stirring for 1min, adding 4-8 parts by weight of organic fibers, stirring for 2min, then continuously adding 140-180 parts of water, and stirring for 3min.
Further, the organic fibers are selected from PP polypropylene fibers and/or PVA polyvinyl alcohol fibers.
Further, the density of the organic fiber is 0.91 g/cm 3 ~1.23g/cm 3 The length is 10 mm-12 mm.
Further, the organic fiber is selected from organic fiber FLOTAGE CF-2 of Guangdong lake technology Co.
The organic fiber is added, and because the organic fiber is a fiber with lower elastic modulus, the fiber has good flexibility, and can be well distributed in concrete after being doped into the concrete to form a three-dimensional disordered support net, and after being doped into the concrete, the compressive strength and the flexural strength of the concrete are improved to different degrees, so that the instantaneous maximum impact force of the concrete is improved. According to the invention, the modified waste PCB coarse particles and the organic fibers are synergistically acted in the concrete, so that the mechanical strength, toughness, crack resistance and volume stability are obviously improved, and the modified waste PCB coarse particles and the organic fibers are obviously superior to those of the concrete on the market.
Further, the cellulose ether is selected from methyl hydroxypropyl cellulose ether or methyl hydroxyethyl cellulose ether, and the viscosity range is 500 mPa.s-700 mPa.s. The viscosity is NDJ viscosity.
Further, the cellulose ether is selected from methyl hydroxypropyl cellulose ether HPMC500 of Guangdong lake science and technology Co.
Cellulose ethers can improve the workability of concrete and reduce the possibility of cracking. Meanwhile, the methyl hydroxypropyl cellulose ether or methyl hydroxyethyl cellulose ether belongs to a high polymer, can bond calcium hydroxide to increase the cohesive force of cement, and improves the strength of concrete. However, the cellulose ether has the air entraining effect, air bubbles can be introduced, the compressive strength of the concrete is influenced by the cellulose ether, and the compressive strength of the concrete is improved by adding modified waste PCB coarse particles, and etching and roughening the coarse surface of the particles by hydrochloric acid aqueous solution, so that the particles have a microstructure, and the cellulose ether and the high polymer produce binding force to act synergistically.
The substituent group and the viscosity influence the cellulose ether to play a role in the concrete, and the methyl hydroxypropyl cellulose ether or the methyl hydroxyethyl cellulose ether is selected, so that the viscosity is in the range of 500 mPa.s-700 mPa.s, and the obtained concrete has better comprehensive performance. Too low a viscosity, poor water retention of the concrete, and too high a viscosity will reduce the post-compression strength.
Further, the water reducer is selected from one of sulfonated melamine polycondensate water reducer, polyethylene glycol water reducer and polycarboxylic acid water reducer.
The water reducer is selected from sulfonated melamine polycondensate water reducer MELMENT F10 of Basoff chemical company.
Further, the dispersing agent is a polyacrylate surfactant.
Further, the dispersant is selected from polyacrylate surfactant DISPERBYK-2290 of Pick chemical Co.
Further, the cement is P.O 42.5.5 cement manufactured by Huaxin cement Co., ltd.
Further, the river sand mesh number is 40-70 mesh.
Further, the slag is commercially available S95 grade.
The invention also provides the high-ductility concrete prepared by the preparation method, and the tensile strain of the high-ductility concrete exceeds 2%.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a high-ductility concrete based on modified waste PCB coarse particles and a preparation method thereof, wherein the modified waste PCB coarse particles, cement, river sand, slag and cellulose ether are mixed, and an auxiliary agent is added to prepare the high-ductility concrete, so that the situation that organic fibers are unevenly dispersed and agglomerated in the high-ductility concrete is caused, when the situation occurs, the actual dispersion rate of the fibers in the concrete is low, the number of fibers in unit volume is low, the effects of dispersing stress, preventing cracking and improving strength and toughness cannot be achieved, but the modified PCB coarse particles are added, so that the fibers are more uniformly dispersed, the number of the fibers in unit volume is improved, the organic fibers and the high-ductility concrete are tightly combined by means of a high-activity rough microscopic surface structure of the modified PCB coarse particles, the structural defect is overcome, and finally, the high-quality concrete with high strength, high toughness and ultra-long durability is obtained, and a long-term good effect can be maintained after the building is repaired.
According to the invention, the dilute hydrochloric acid is used for modifying the waste PCB coarse particles, so that the surface of the waste PCB coarse particles has a rough microscopic surface structure, the activity of the waste PCB coarse particles is improved, and various raw materials play a role in cooperation through compounding, so that the method has a remarkable role in improving the performance of concrete. The modification process is simple, easy to operate, universal, convenient to popularize and use in actual production, and applicable to construction of roads, bridges and large-scale buildings. The invention can prepare high-performance concrete, consume waste PCB, replace incineration by recycling, and have important significance for protecting environment, recycling, ensuring construction quality, improving modernization level of construction and the like.
Drawings
Fig. 1 is a microstructure of untreated PCB coarse particles and surface-treated PCB coarse particles, wherein a is untreated PCB coarse particles and B is surface-treated PCB coarse particles.
Description of the embodiments
In order to better understand the technical scheme provided by the invention, the technical scheme provided by the invention is described in detail below by combining examples and comparative examples.
The invention provides high-ductility concrete based on modified waste PCB coarse particles, and the formulation of each example and comparative example by weight is shown in table 1. The preparation method of the high-ductility concrete comprises the following steps: (1) Adding cement, river sand, slag, cellulose ether, a water reducing agent and a dispersing agent into stirring equipment, and stirring to form a uniform mixture; (2) Adding water into the uniform mixture in the step (1) and stirring for 1min for 30s; (3) Adding the modified PCB coarse particles, stirring for 1min, continuously adding the organic fibers, continuously stirring for 2min, continuously adding water, and stirring for 3min to obtain the high-ductility concrete.
Wherein, the modified PCB board coarse particles are prepared according to the following steps: (a) Crushing the waste PCB after metal recovery to obtain coarse PCB particles; (b) pouring the PCB coarse particles into HCl solution for soaking for 5min; (c) And washing, filtering and airing the PCB coarse particles to obtain modified PCB coarse particles. The untreated coarse particles of the PCB and the microstructure of the surface treated coarse particles of the PCB are shown in FIG. 1.
The cements in table 1 were P.O 42.5.42.5 cements manufactured by vincrist cement Co., ltd; the river sand mesh number is 40-70 mesh; the slag is of a commercial S95 grade; the organic fiber is selected from organic fiber FLOTAGE CF-2 of Guangdong lake science and technology Co., ltd; the cellulose ether is selected from methyl hydroxypropyl cellulose ether HPMC500 of Guangdong lake science and technology Co; the water reducer is selected from sulfonated melamine polycondensate water reducer MELMENT F10 of Basoff chemical company; the dispersant is selected from polyacrylate surfactant DISPERBYK-2290 of Pick chemical Co. The mesh number of the coarse particles of the PCB is 30-50 meshes; the HCl solution is an aqueous HCl solution with the concentration of 2.0 mol/L.
Performance detection
The test pieces of Table 1 were tested according to the TCECS 997-2022 technical Specification for reinforced masonry construction of high toughness concrete, the results are shown in Table 2:
as can be seen from table 2: as can be seen from the examples 1 and 3, the modified PCB waste coarse-grained high-ductility concrete provided by the invention has technical indexes which completely meet the standard requirements. And the technical index of the high-ductility concrete added with the modified PCB waste coarse particles is obviously higher than that of the high-ductility concrete without the modified PCB waste coarse particles.
As can be seen from comparative examples 1 to 3 and comparative example 1, and examples 4 to 6 and comparative example 2, the high-ductility concrete prepared by the present invention has technical indexes which completely meet the standard requirements. The mixing amount of the waste coarse particles of the modified PCB and the proportion between the raw materials directly influence the performance parameters of the concrete. By reasonably selecting the proportion of various raw materials, the dispersion of the organic fibers is more uniform, various technical indexes are obviously improved, and the composite material has excellent properties such as high ductility, high strength, ultra-long durability and the like, and the workability and the like can be ensured. From the perspective of environmental protection and green materials, the recycling problem of the PCB waste electric plate is solved, and the aggravation of environmental pollution is relieved.
As can be seen from comparative example 3 and example 1, the concrete performance of the modified PCB waste coarse particles added in the invention is obviously better than that of unmodified PCB waste coarse particles, and the modified PCB waste coarse particles are subjected to etching roughening treatment, so that the micro surface structure is coarser, the dispersion of organic fibers is facilitated, and meanwhile, the combination effect with other raw materials is better, and the performance of the concrete is improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The preparation method of the high-ductility concrete based on the modified waste PCB coarse particles is characterized by comprising the following steps of:
(1) Adding 350-500 parts by weight of cement, 350-450 parts by weight of river sand, 50-100 parts by weight of slag, 0.3-1.0 part by weight of cellulose ether, 1.2-1.8 parts by weight of water reducer and 0.6-1.2 parts by weight of dispersing agent into equipment, and uniformly stirring;
(2) Continuously adding 40-60 parts by weight of water, and stirring to obtain a concrete initial material;
(3) Adding 10-50 parts by weight of modified waste PCB coarse particles into the concrete initial material in the step (2), and stirring; continuously adding 4-8 parts by weight of organic fibers, and continuously stirring; adding 140-180 parts by weight of water, and stirring to obtain high-ductility concrete;
the modified waste PCB coarse particles in the step (3) are prepared according to the following steps:
(a) Crushing the waste PCB after metal recovery to obtain coarse particles of the waste PCB;
(b) Pouring the waste PCB coarse particles into HCl solution for soaking;
(c) Washing, filtering and airing the soaked waste PCB coarse particles to obtain modified waste PCB coarse particles;
the mesh number of the coarse particles of the modified waste PCB is 30-50 meshes, and the modified waste PCB is in the shape of a strip;
the water reducer is selected from one of sulfonated melamine polycondensate water reducer, polyethylene glycol water reducer and polycarboxylic acid water reducer;
the dispersing agent is polyacrylate surfactant.
2. The preparation method of the modified waste PCB coarse particle-based high-ductility concrete, which is disclosed in claim 1, is characterized in that the HCl solution is hydrochloric acid aqueous solution with the concentration of 1.0 mol/L-2.0 mol/L.
3. The method for preparing high-ductility concrete based on modified waste PCB coarse particles according to claim 1, wherein the organic fiber is selected from polypropylene fiber and/or polyvinyl alcohol fiber.
4. The method for preparing high-ductility concrete based on modified waste PCB coarse particles as set forth in claim 3, wherein the density of the organic fibers isIs 0.91 g/cm 3 ~1.23g/cm 3 The length is 10 mm-12 mm.
5. The preparation method of the modified waste PCB coarse particle-based high-ductility concrete, which is disclosed in claim 1, is characterized in that the cellulose ether is methyl hydroxypropyl cellulose ether or methyl hydroxyethyl cellulose ether, and the viscosity range is 500 mPa.s-700 mPa.s.
6. A modified waste PCB coarse particle based high ductility concrete prepared by the method of any one of claims 1 to 5, characterized in that the modified waste PCB coarse particle based high ductility concrete has a tensile strain exceeding 2%.
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| US20100222458A1 (en) * | 2009-03-02 | 2010-09-02 | Wu-Tian Wang | Compositions and processing methods of environmental-friendly multiple-effect powder |
| CN104030628A (en) * | 2014-06-25 | 2014-09-10 | 江苏融源再生资源科技有限公司 | Method for preparing concrete kerbstones and paving bricks from nonmetal powder of waste circuit boards |
| WO2019130331A1 (en) * | 2017-12-29 | 2019-07-04 | Ravikumar P | Polyester resin concrete using recycled powdered printed circuit board |
| CN108455910A (en) * | 2018-04-26 | 2018-08-28 | 合肥金云新材料有限公司 | A kind of high-tenacity fiber enhancing construction material and preparation method thereof |
| CN110939152A (en) * | 2019-10-31 | 2020-03-31 | 成都建工第二建筑工程有限公司 | Raft foundation construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503294A (en) * | 2011-10-08 | 2012-06-20 | 同济大学 | Method for preparing environment-friendly concrete with waste circuit board nonmetal powder |
| CN102675736A (en) * | 2012-04-26 | 2012-09-19 | 中国电器科学研究院有限公司 | Recycled composite material for enhancing modified waste polypropylene by using waste printed circuit board powder/glass fiber and preparation method of recycled composite material |
| CN107353482A (en) * | 2017-08-22 | 2017-11-17 | 上海第二工业大学 | A kind of modified abandoned printed substrate non-metal powder/composite polyolefine material and preparation method thereof |
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