CN113800863A - Modified recycled aggregate concrete with electromagnetic wave-transmitting function and preparation method thereof - Google Patents
Modified recycled aggregate concrete with electromagnetic wave-transmitting function and preparation method thereof Download PDFInfo
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- CN113800863A CN113800863A CN202110985592.7A CN202110985592A CN113800863A CN 113800863 A CN113800863 A CN 113800863A CN 202110985592 A CN202110985592 A CN 202110985592A CN 113800863 A CN113800863 A CN 113800863A
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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
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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
- 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
Abstract
A modified recycled aggregate concrete with a wave-transmitting function and a preparation method thereof belong to the field of building materials. The composition is as follows: 450 parts of sulphoaluminate cement, 40-80 parts of mineral admixture, 30-42 parts of composite plant fiber, 11-18 parts of composite metal salt, 138 parts of wave-transmitting material, 900 parts of natural sand and 800 parts of modified and regenerated coarse aggregate. 85-150 parts of mixing water and 2-5 parts of water reducing agent. The wave-transmitting material is obtained by mixing chopped basalt fibers, polymethyl methacrylate, polytetrafluoroethylene concentrated dispersion liquid and quartz chopped fibers; the modified recycled coarse aggregate is obtained by processing silicon nitride ceramic fragments, glass beads and polytetrafluoroethylene waste plastic particles. The 28-day compressive strength of the concrete can reach 49-53MPa, and the bandwidth with wave-transmitting rate larger than-3 dB is larger than 8.2GHz within the frequency range of 4-18 GHz.
Description
One, the technical field
The invention relates to modified recycled aggregate concrete with a wave-transmitting function and a preparation method thereof, belongs to the technical field of building materials, and not only can a large amount of waste materials be recycled as recycled aggregates, but also the electromagnetic wave transmittance of the concrete can be greatly improved.
Second, background Art
With the rapid development of 5G, the performance and cost of base station equipment become a hot topic of public concern. Compared with a 4G network, the 5G network needs to use larger bandwidth, the required power is about 5 times of that of the 4G network, and the medium-high frequency band spectrum is beneficial to playing the characteristic of large 5G bandwidth, so that domestic operators mainly adopt the medium-high frequency band spectrum to deploy the 5G network. However, the high frequency of the electromagnetic wave in the middle and high frequency band spectrum results in short transmission distance, large propagation loss and weak penetration capability of the electromagnetic wave, so that the coverage area of a single base station is small. To achieve the full coverage of the 5G network, the number of required base stations is about 3 times that of the 4G network, which undoubtedly greatly increases the construction and operation cost. Therefore, the general concrete material has not been able to satisfy the functional requirements for the electromagnetic wave transmittance in the 5G era.
Based on the above, it is imperative to realize high wave-transmitting rate of concrete materials. However, the research on the wave-transparent material is mainly applied to the antenna housing of the aircraft, the research materials are concentrated on a silicon dioxide system, a boron nitride system, a sialon system, a phosphate system, an organic silicon resin system and the like, and the wave-transparent material for the antenna housing with high temperature resistance and excellent wave-transparent performance is not generated. Aiming at the problem that the wave-transmitting performance of recycled aggregate concrete is rarely researched, a few scholars research the influence of additives such as epoxy resin, an air entraining agent and the like on the wave-transmitting performance of the concrete; regarding the doping of waste materials such as ceramics and plastic particles, numerous scholars mainly explore the influence of the waste materials on the mechanical property of concrete, but the research on the influence of the waste materials on the wave-transmitting property of the concrete is less.
The wave-transparent concrete is prepared by utilizing the recycled aggregate, so that on one hand, the recycling of waste materials can be realized, and the reasonable treatment of resources is promoted; on the other hand, recycled aggregates such as silicon nitride ceramics, glass beads, polytetrafluoroethylene waste plastic particles and the like have excellent dielectric properties and can further enhance the wave-transmitting performance of concrete materials. The wave-transparent concrete can enhance the transmission performance of microwave signals, can be applied to the construction of base stations, reduces the investment cost of 5G base stations, can also improve the stealth performance of buildings under radar investigation, and plays an important role in the fields of national defense and military and the like.
Third, the invention
The invention aims to provide modified recycled aggregate concrete with a wave-transmitting function and a preparation method thereof, aiming at the defects of the prior art. The resource utilization rate of the waste materials is improved by using the recycled aggregate, the wave-transmitting material and the composite plant fiber are added at the same time, the wave-transmitting rate and the mechanical property of the concrete are improved, the 28-day compressive strength of the prepared concrete can reach 49-53MPa, the prepared concrete has good wave-transmitting performance, and the bandwidth of the wave-transmitting rate larger than-3 dB is 8.2GHz within the frequency range of 4-18 GHz.
The technical scheme of the invention is as follows:
1. a modified recycled aggregate concrete with a wave-transparent function is characterized in that: the concrete comprises the following components in parts by weight: 450 parts of sulphoaluminate cement, 40-80 parts of mineral admixture, 30-42 parts of composite plant fiber, 11-18 parts of composite metal salt, 138 parts of wave-transmitting material, 900 parts of natural sand and 800 parts of modified and regenerated coarse aggregate. 85-150 parts of water and 2-5 parts of water reducing agent.
2. Further, the mineral admixture comprises the following components in parts by weight: 10-20 parts of zeolite powder, 10-20 parts of phosphorus slag powder and 20-40 parts of silica fume.
3. Further, the composite plant fiber comprises the following components in parts by weight: 10-17 parts of jute fiber and 20-25 parts of bamboo fiber. The length of the jute fiber is 3mm, and the diameter is 15 mu m; the length of the bamboo fiber is 8mm, and the diameter is 200 μm.
4. Further, the composite metal salt comprises the following components in parts by weight: 6-9 parts of zinc sulfate and 5-9 parts of aluminum silicate.
5. Further, the wave-transmitting material comprises the following components in parts by weight: 40-50 parts of chopped basalt fibers, 1-3 parts of polymethyl methacrylate, 30-35 parts of polytetrafluoroethylene concentrated dispersion liquid and 30-50 parts of quartz chopped fibers. The solid content of the polytetrafluoroethylene concentrated dispersion liquid is 60 wt%, the length of the chopped basalt fiber is 6mm, the diameter of the chopped basalt fiber is 7 mu m, and the length of the quartz chopped fiber is 6mm, and the diameter of the quartz chopped fiber is 8 mu m.
6. Further, the natural sand is river sand with fineness modulus of 2.7; the modified recycled coarse aggregate comprises the following components in parts by weight: 400 portions of silicon nitride ceramic fragments, 400 portions of glass beads, and 200 portions of polytetrafluoroethylene waste plastic particles. The particle size range of the modified recycled coarse aggregate is 5mm-20 mm.
7. SiO in the glass beads2The contents are all more than 70 percent.
8. The preparation method of the wave-transmitting material comprises the following steps:
(1) dispersing polymethyl methacrylate and 15-20 parts of polytetrafluoroethylene concentrated dispersion liquid at room temperature for 1 hour by using an ultrasonic disperser, and then stirring for 0.5 hour to form a mixture 1;
(2) adding 15 parts by weight of polytetrafluoroethylene concentrated dispersion into quartz chopped fibers, and dispersing for 1 hour by using a magnetic stirrer to form a mixture 2;
(3) putting the mixture 1, the mixture 2 and the chopped basalt fibers into an electric stirrer together and stirring for 1 hour; then the mixture is dried to constant weight in a drying oven at 85 ℃ to obtain a primary mixed material;
(4) and (4) crushing the primary mixed material prepared in the step (3) in a crusher to obtain the wave-transmitting material with the fineness of 100 meshes.
9. The method for preparing the modified recycled aggregate concrete with the wave-transmitting function is characterized by comprising the following preparation steps of:
(1) dry-mixing cement, natural sand, mineral admixture and wave-transmitting material for 5min, and uniformly mixing to form dry powder;
(2) sequentially adding the composite plant fiber and the composite metal salt into the dry powder prepared in the step (1), sequentially stirring for 3min, and then adding 3/4 water and uniformly stirring;
(3) and (3) simultaneously adding the modified recycled coarse aggregate, the water reducing agent and the residual 1/4 water into the mixture prepared in the step (2), and continuously stirring for 8-10min to obtain the modified recycled aggregate concrete with the wave-transmitting function.
10. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent purchased from the market, and the water reducing rate is 20%.
11. The polymethyl methacrylate is commercially available, and the CAS number: 9011-14-7, molecular formula: c5H8O2Molecular weight: 101.1238, property: white powder.
12. The zinc sulfate and the aluminum silicate are chemical pure products sold in the market.
Compared with the prior art, the invention has the following advantages:
(1) the wave-transparent material developed by the invention combines the chopped basalt fiber, the quartz chopped fiber and the polytetrafluoroethylene; SiO 22Has good dielectric property, SiO in the chopped basalt fiber2The content is more than 50%, the dielectric constant is about 2.63, and the dielectric loss is about 0.005; SiO in quartz chopped fiber2The content is more than 90 percent, the dielectric constant is 3.70, and the dielectric loss is 0.0001; when electromagnetic waves are transmitted, the chopped basalt fibers have low polarization capability, the energy loss generated by the quartz chopped fibers is small, and the chopped basalt fibers and the quartz chopped fibers have different transmission electromagnetic wave mechanisms to form complementation; in addition, the quartz fiber is expensive, and the addition of the basalt fiber is favorable for reducing the cost. The dielectric constant of the polytetrafluoroethylene is 2.35, the magnetic conductivity is 1.0, and the polytetrafluoroethylene is a high-temperature-resistant insulating material with excellent dielectric property; the basalt fiber and the quartz fiber both use polytetrafluoroethylene as coatings, and the acid and alkali resistance of the fiber can be enhanced while the wave transmittance is ensured.
(2) In the modified recycled coarse aggregate adopted by the invention, silicon nitride ceramic fragments, glass beads and polytetrafluoroethylene waste plastic particles are all materials with better wave-transmitting performance. Meanwhile, the recycled aggregate can save a large amount of natural aggregate, and is beneficial to the reasonable treatment of waste materials and the development of circular economy.
Detailed Description
For further disclosure, but not limitation, the present invention is described in further detail below with reference to examples.
Example 1
The modified recycled aggregate concrete with the wave-transmitting function comprises the following proportioning and preparation steps:
1. the concrete comprises the following components in parts by weight: 400 parts of sulphoaluminate cement, 40 parts of mineral admixture, 30 parts of composite plant fiber, 11 parts of composite metal salt, 101 parts of wave-transmitting material, 700 parts of natural sand, 800 parts of modified recycled coarse aggregate, 85 parts of mixing water and 2 parts of water reducing agent.
2. The mineral admixture comprises the following components in parts by weight: 10 parts of zeolite powder, 10 parts of phosphorus slag powder and 20 parts of silica fume.
3. The composite plant fiber comprises the following components in parts by weight: 10 parts of jute fiber and 20 parts of bamboo fiber. The length of the jute fiber is 3mm, and the diameter is 15 mu m; the length of the bamboo fiber is 8mm, and the diameter is 200 μm.
4. The composite metal salt comprises the following components in parts by weight: 6 parts of zinc sulfate and 5 parts of aluminum silicate.
5. The wave-transmitting material comprises the following components in parts by weight: 40 parts of chopped basalt fibers, 1 part of polymethyl methacrylate, 30 parts of polytetrafluoroethylene concentrated dispersion liquid and 30 parts of quartz chopped fibers. The solid content of the polytetrafluoroethylene concentrated dispersion liquid is 60 wt%, the length of the chopped basalt fiber is 6mm, the diameter of the chopped basalt fiber is 7 mu m, and the length of the quartz chopped fiber is 6mm, and the diameter of the quartz chopped fiber is 8 mu m.
6. The natural sand is river sand with fineness modulus of 2.7; the modified recycled coarse aggregate comprises the following components in parts by weight: 400 parts of silicon nitride ceramic fragments, 300 parts of glass beads and 100 parts of polytetrafluoroethylene waste plastic particles. The particle size range of the modified recycled coarse aggregate is 5mm-20 mm.
7. The glass bead comprises the following components in percentage by weight: SiO 2276.5% of CaO, 9.0% of Na2O content of 7.4%, MgO content of 5.8%, Al2O3Content of 1.2% Fe2O3The content is 0.1%.
8. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent purchased from the market, and the water reducing rate is 20%.
9. The polymethyl methacrylate is commercially available, and the CAS number: 9011-14-7, molecular formula: c5H8O2Molecular weight: 101.1238, property: white powder.
10. The zinc sulfate and the aluminum silicate are chemical pure products sold in the market.
11. The preparation method of the wave-transmitting material comprises the following steps:
(1) dispersing polymethyl methacrylate and 15 parts by weight of polytetrafluoroethylene concentrated dispersion liquid for 1 hour at room temperature by using an ultrasonic disperser, and then stirring for 0.5 hour to form a mixture 1;
(2) adding 15 parts by weight of polytetrafluoroethylene concentrated dispersion into quartz chopped fibers, and dispersing for 1 hour by using a magnetic stirrer to form a mixture 2;
(3) the mixture 1, the mixture 2 and 40 parts by weight of chopped basalt fiber are put into an electric stirrer together and stirred for 1 hour; then the mixture is dried to constant weight in a drying oven at 85 ℃ to obtain a primary mixed material;
(4) and (4) crushing the primary mixed material prepared in the step (3) in a crusher to obtain the wave-transmitting material with the fineness of 100 meshes.
12. The preparation method of the modified recycled aggregate concrete with the wave-transmitting function comprises the following steps:
(1) 400 parts of sulphoaluminate cement, 700 parts of natural sand, 40 parts of mineral admixture and 101 parts of wave-transmitting material are mixed for 5min in a dry mode and uniformly mixed to form dry powder;
(2) sequentially adding 30 parts by weight of composite plant fiber and 11 parts by weight of composite metal salt into the dry powder prepared in the step (1), sequentially stirring for 3min, and then adding 60 parts by weight of mixing water and uniformly stirring;
(3) and (3) adding 800 parts by weight of modified recycled coarse aggregate, 2 parts by weight of water reducing agent and 25 parts by weight of mixing water into the mixture prepared in the step (2), and continuously stirring for 9min to obtain the modified recycled aggregate concrete with the wave-transmitting function.
Example 2
The modified recycled aggregate concrete with the wave-transmitting function comprises the following proportioning and preparation steps:
1. the concrete comprises the following components in parts by weight: 420 parts of sulphoaluminate cement, 53 parts of mineral admixture, 34 parts of composite plant fiber, 14 parts of composite metal salt, 123 parts of wave-transmitting material, 760 parts of natural sand, 900 parts of modified regenerated coarse aggregate, 105 parts of mixing water and 3 parts of water reducing agent.
2. The mineral admixture comprises the following components in parts by weight: 13 parts of zeolite powder, 13 parts of phosphorus slag powder and 27 parts of silica fume.
3. The composite plant fiber comprises the following components in parts by weight: 12 parts of jute fiber and 22 parts of bamboo fiber. The length of the jute fiber is 3mm, and the diameter is 15 mu m; the length of the bamboo fiber is 8mm, and the diameter is 200 μm.
4. The composite metal salt comprises the following components in parts by weight: 7 parts of zinc sulfate and 7 parts of aluminum silicate.
5. The wave-transmitting material comprises the following components in parts by weight: 43 parts of chopped basalt fibers, 2 parts of polymethyl methacrylate, 31 parts of polytetrafluoroethylene concentrated dispersion liquid and 37 parts of quartz chopped fibers. The solid content of the polytetrafluoroethylene concentrated dispersion liquid is 60 wt%, the length of the chopped basalt fiber is 6mm, the diameter of the chopped basalt fiber is 7 mu m, and the length of the quartz chopped fiber is 6mm, and the diameter of the quartz chopped fiber is 8 mu m.
6. The natural sand is river sand with fineness modulus of 2.7; the modified recycled coarse aggregate comprises the following components in parts by weight: 430 parts of silicon nitride ceramic fragments, 330 parts of glass beads and 140 parts of polytetrafluoroethylene waste plastic particles. The particle size range of the modified recycled coarse aggregate is 5mm-20 mm.
7. The glass bead comprises the following components in percentage by weight: SiO 2276.5% of CaO, 9.0% of Na2O content of 7.4%, MgO content of 5.8%, Al2O3Content of 1.2% Fe2O3The content is 0.1%.
8. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent purchased from the market, and the water reducing rate is 20%.
9. The polymethyl methacrylate is commercially available, and the CAS number: 9011-14-7, molecular formula: c5H8O2Molecular weight: 101.1238, property: white powder.
10. The zinc sulfate and the aluminum silicate are chemical pure products sold in the market.
11. The preparation method of the wave-transmitting material comprises the following steps:
(1) dispersing 2 parts by weight of polymethyl methacrylate and 16 parts by weight of polytetrafluoroethylene concentrated dispersion liquid at room temperature for 1 hour by using an ultrasonic disperser, and then stirring for 0.5 hour to form a mixture 1;
(2) adding 37 parts by weight of quartz chopped fibers into 15 parts by weight of polytetrafluoroethylene concentrated dispersion, and dispersing for 1 hour by using a magnetic stirrer to form a mixture 2;
(3) putting the mixture 1, the mixture 2 and 43 parts by weight of chopped basalt fibers into an electric stirrer together and stirring for 1 hour; then the mixture is dried to constant weight in a drying oven at 85 ℃ to obtain a primary mixed material;
(4) and (4) crushing the primary mixed material prepared in the step (3) in a crusher to obtain the wave-transmitting material with the fineness of 100 meshes.
12. The preparation method of the modified recycled aggregate concrete with the wave-transmitting function comprises the following steps:
(1) mixing 420 parts by weight of sulphoaluminate cement, 760 parts by weight of natural sand, 53 parts by weight of mineral admixture and 123 parts by weight of wave-transmitting material for 5min in a dry mode, and uniformly mixing to form a dry powder;
(2) sequentially adding 34 parts by weight of composite plant fiber and 14 parts by weight of composite metal salt into the dry powder prepared in the step (1), sequentially stirring for 3min, and then adding 78 parts by weight of mixing water and uniformly stirring;
(3) and (3) adding 900 parts by weight of modified recycled coarse aggregate, 3 parts by weight of water reducing agent and 27 parts by weight of mixing water into the mixture prepared in the step (2), and continuously stirring for 9min to obtain the modified recycled aggregate concrete with the wave-transmitting function.
Example 3
The modified recycled aggregate concrete with the wave-transmitting function comprises the following proportioning and preparation steps:
1. the concrete comprises the following components in parts by weight: 440 parts of sulphoaluminate cement, 67 parts of mineral admixture, 38 parts of composite plant fiber, 16 parts of composite metal salt, 124 parts of wave-transmitting material, 830 parts of natural sand, 990 parts of modified regenerated coarse aggregate, 128 parts of mixing water and 4 parts of water reducing agent.
2. The mineral admixture comprises the following components in parts by weight: 17 parts of zeolite powder, 17 parts of phosphorous slag powder and 33 parts of silica fume.
3. The composite plant fiber comprises the following components in parts by weight: 14 parts of jute fiber and 24 parts of bamboo fiber. The length of the jute fiber is 3mm, and the diameter is 15 mu m; the length of the bamboo fiber is 8mm, and the diameter is 200 μm.
4. The composite metal salt comprises the following components in parts by weight: 8 parts of zinc sulfate and 8 parts of aluminum silicate.
5. The wave-transmitting material comprises the following components in parts by weight: 46 parts of chopped basalt fibers, 2 parts of polymethyl methacrylate, 33 parts of polytetrafluoroethylene concentrated dispersion liquid and 43 parts of quartz chopped fibers. The solid content of the polytetrafluoroethylene concentrated dispersion liquid is 60 wt%, the length of the chopped basalt fiber is 6mm, the diameter of the chopped basalt fiber is 7 mu m, and the length of the quartz chopped fiber is 6mm, and the diameter of the quartz chopped fiber is 8 mu m.
6. The natural sand is river sand with fineness modulus of 2.7; the modified recycled coarse aggregate comprises the following components in parts by weight: 460 parts of silicon nitride ceramic fragments, 360 parts of glass beads and 170 parts of polytetrafluoroethylene waste plastic particles. The particle size range of the modified recycled coarse aggregate is 5mm-20 mm.
7. The glass bead comprises the following components in percentage by weight: SiO 2276.5% of CaO, 9.0% of Na2O content of 7.4%, MgO content of 5.8%, Al2O3Content of 1.2% Fe2O3The content is 0.1%.
8. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent purchased from the market, and the water reducing rate is 20%.
9. The polymethyl methacrylate is commercially available, and the CAS number: 9011-14-7, molecular formula: c5H8O2Molecular weight: 101.1238, property: white powder.
10. The zinc sulfate and the aluminum silicate are chemical pure products sold in the market.
11. The preparation method of the wave-transmitting material comprises the following steps:
(1) dispersing 2 parts by weight of polymethyl methacrylate and 18 parts by weight of polytetrafluoroethylene concentrated dispersion liquid at room temperature for 1 hour by using an ultrasonic disperser, and then stirring for 0.5 hour to form a mixture 1;
(2) adding 43 parts by weight of quartz chopped fibers into 15 parts by weight of polytetrafluoroethylene concentrated dispersion, and dispersing for 1 hour by using a magnetic stirrer to form a mixture 2;
(3) putting the mixture 1, the mixture 2 and 46 parts by weight of chopped basalt fibers into an electric stirrer together and stirring for 1 hour; then the mixture is dried to constant weight in a drying oven at 85 ℃ to obtain a primary mixed material;
(4) and (4) crushing the primary mixed material prepared in the step (3) in a crusher to obtain the wave-transmitting material with the fineness of 100 meshes.
12. The preparation method of the modified recycled aggregate concrete with the wave-transmitting function comprises the following steps:
(1) 440 parts of sulphoaluminate cement, 830 parts of natural sand, 67 parts of mineral admixture and 124 parts of wave-transmitting material are mixed for 5min in a dry mode and uniformly mixed to form dry powder;
(2) sequentially adding 38 parts by weight of composite plant fiber and 16 parts by weight of composite metal salt into the dry powder prepared in the step (1), sequentially stirring for 3min, and then adding 96 parts by weight of mixing water and uniformly stirring;
(3) and (3) adding 990 parts by weight of modified recycled coarse aggregate, 4 parts by weight of water reducing agent and 32 parts by weight of mixing water into the mixture prepared in the step (2), and continuously stirring for 9min to obtain the modified recycled aggregate concrete with the wave-transmitting function.
Example 4
The modified recycled aggregate concrete with the wave-transmitting function comprises the following proportioning and preparation steps:
1. the concrete comprises the following components in parts by weight: 450 parts of sulphoaluminate cement, 80 parts of mineral admixture, 42 parts of composite plant fiber, 18 parts of composite metal salt, 138 parts of wave-transmitting material, 900 parts of natural sand, 1100 parts of modified recycled coarse aggregate, 150 parts of water and 5 parts of water reducing agent.
2. The mineral admixture comprises the following components in parts by weight: 20 parts of zeolite powder, 20 parts of phosphorus slag powder and 40 parts of silica fume.
3. The composite plant fiber comprises the following components in parts by weight: 17 parts of jute fiber and 25 parts of bamboo fiber. The length of the jute fiber is 3mm, and the diameter is 15 mu m; the length of the bamboo fiber is 8mm, and the diameter is 200 μm.
4. The composite metal salt comprises the following components in parts by weight: 9 parts of zinc sulfate and 9 parts of aluminum silicate.
5. The wave-transmitting material comprises the following components in parts by weight: 50 parts of chopped basalt fibers, 3 parts of polymethyl methacrylate, 35 parts of polytetrafluoroethylene concentrated dispersion liquid and 50 parts of quartz chopped fibers. The solid content of the polytetrafluoroethylene concentrated dispersion liquid is 60 wt%, the length of the chopped basalt fiber is 6mm, the diameter of the chopped basalt fiber is 7 mu m, and the length of the quartz chopped fiber is 6mm, and the diameter of the quartz chopped fiber is 8 mu m.
6. The natural sand is river sand with fineness modulus of 2.7; the modified recycled coarse aggregate comprises the following components in parts by weight: 500 parts of silicon nitride ceramic fragments, 400 parts of glass beads and 200 parts of polytetrafluoroethylene waste plastic particles. The particle size range of the modified recycled coarse aggregate is 5mm-20 mm.
7. The glass bead comprises the following components in percentage by weight: SiO 2276.5% of CaO, 9.0% of Na2O content of 7.4%, MgO content of 5.8%, Al2O3Content of 1.2% Fe2O3The content is 0.1%.
8. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent purchased from the market, and the water reducing rate is 20%.
9. The polymethyl methacrylate is commercially available, and the CAS number: 9011-14-7, molecular formula: c5H8O2Molecular weight: 101.1238, property: white powder.
10. The zinc sulfate and the aluminum silicate are chemical pure products sold in the market.
11. The preparation method of the wave-transmitting material comprises the following steps:
(1) dispersing 3 parts by weight of polymethyl methacrylate and 20 parts by weight of polytetrafluoroethylene concentrated dispersion liquid at room temperature for 1 hour by using an ultrasonic disperser, and then stirring for 0.5 hour to form a mixture 1;
(2) adding 50 parts by weight of quartz chopped fibers into 15 parts by weight of polytetrafluoroethylene concentrated dispersion, and dispersing for 1 hour by using a magnetic stirrer to form a mixture 2;
(3) the mixture 1, the mixture 2 and 50 parts by weight of chopped basalt fiber are put into an electric stirrer together and stirred for 1 hour; then the mixture is dried to constant weight in a drying oven at 85 ℃ to obtain a primary mixed material;
(4) and (4) crushing the primary mixed material prepared in the step (3) in a crusher to obtain the wave-transmitting material with the fineness of 100 meshes.
12. The preparation method of the modified recycled aggregate concrete with the wave-transmitting function comprises the following steps:
(1) mixing 450 parts by weight of sulphoaluminate cement, 900 parts by weight of natural sand, 80 parts by weight of mineral admixture and 138 parts by weight of wave-transmitting material for 5min in a dry mode, and uniformly mixing to form a dry powder;
(2) adding 42 parts by weight of composite plant fiber and 18 parts by weight of composite metal salt into the dry powder prepared in the step (1) in sequence, stirring for 3min in sequence, and then adding 112 parts by weight of mixing water and stirring uniformly;
(3) and (3) adding 1100 parts by weight of modified recycled coarse aggregate, 5 parts by weight of water reducing agent and 38 parts by weight of mixing water into the mixture prepared in the step (2), and continuously stirring for 9min to obtain the modified recycled aggregate concrete with the wave-transmitting function.
Comparative example 1
The common concrete comprises the following steps:
1. according to the weight parts of the raw materials, 400 parts of sulphoaluminate cement, 700 parts of natural river sand, 800 parts of natural stones and 85 parts of water.
2. The fineness modulus of the natural river sand is 2.7, and the particle size range of the natural stones is 5mm-20 mm.
3. 400 parts of sulphoaluminate cement, 700 parts of natural river sand and 800 parts of natural stones are mixed for 5min in a dry mode and evenly mixed to form dry powder.
4. And slowly adding 85 parts by weight of water, and continuously stirring for 9min to obtain the common concrete.
Comparative example 2
The common concrete comprises the following steps:
1. the cement mortar comprises, by weight, 420 parts of sulphoaluminate cement, 760 parts of natural river sand, 900 parts of natural stones and 105 parts of water.
2. The fineness modulus of the natural river sand is 2.7, and the particle size range of the natural stones is 5mm-20mm
3. And (3) dry-mixing 420 parts by weight of cement, 760 parts by weight of natural river sand and 900 parts by weight of natural stones for 5min, and uniformly mixing to form a dry powder.
4. Then, 105 parts by weight of water was slowly added thereto, and the mixture was further stirred for 9min to obtain a general concrete.
Comparative example 3
The common concrete comprises the following steps:
1. 440 parts of sulphoaluminate cement, 830 parts of natural river sand, 990 parts of natural stones and 128 parts of water.
2. The fineness modulus of the natural river sand is 2.7, and the particle size range of the natural stones is 5mm-20mm
3. 440 parts of cement, 830 parts of natural river sand and 990 parts of natural stones are dry-mixed for 5min and uniformly mixed to form a dry powder.
4. Then, 128 parts by weight of water was slowly added thereto, and the mixture was further stirred for 9min to obtain a general concrete.
Comparative example 4
The common concrete comprises the following steps:
1. according to the weight parts of the raw materials, 450 parts of sulphoaluminate cement, 900 parts of natural river sand, 1100 parts of natural stones and 150 parts of water.
2. The fineness modulus of the natural river sand is 2.7, and the particle size range of the natural stones is 5mm-20mm
3. And (3) dry-mixing 450 parts by weight of cement, 900 parts by weight of natural river sand and 1100 parts by weight of natural stones for 5min, and uniformly mixing to form a dry powder.
4. And slowly adding 150 parts by weight of water, and continuously stirring for 9min to obtain the common concrete.
Test results
The test group tests the transmissivity of the obtained electromagnetic wave-transmitting concrete test piece according to GJB7954-2012 'test method for wave-transmitting rate of radar wave-transmitting material', and tests the compressive strength of the obtained electromagnetic wave-transmitting concrete test piece according to GB/T50081-2016 'test method standard for mechanical properties of common concrete', and the results are shown in the following table.
It can be seen that the 28-day compressive strength and the wave-transmitting rate of the concrete of the above examples 1-4 are stabilized at a higher level than those of the comparative examples, and the compressive strength of the concrete is stabilized and the wave-transmitting performance is greatly improved under the synergistic effect of the wave-transmitting material and the modified recycled aggregate.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (8)
1. A modified recycled aggregate concrete with a wave-transparent function is characterized in that: the concrete comprises the following components in parts by weight: 450 parts of sulphoaluminate cement, 40-80 parts of mineral admixture, 30-42 parts of composite plant fiber, 11-18 parts of composite metal salt, 138 parts of wave-transmitting material, 900 parts of natural sand and 800 parts of modified regenerated coarse aggregate; 85-150 parts of water and 2-5 parts of water reducing agent;
the wave-transmitting material comprises the following components in parts by weight: 40-50 parts of chopped basalt fibers, 1-3 parts of polymethyl methacrylate, 30-35 parts of polytetrafluoroethylene concentrated dispersion liquid and 30-50 parts of quartz chopped fibers; the solid content of the polytetrafluoroethylene concentrated dispersion liquid is 60 wt%, the length of the chopped basalt fiber is 6mm, the diameter of the chopped basalt fiber is 7 mu m, and the length of the quartz chopped fiber is 6mm, and the diameter of the quartz chopped fiber is 8 mu m.
2. The concrete according to claim 1, wherein: the mineral admixture comprises the following components in parts by weight: 10-20 parts of zeolite powder, 10-20 parts of phosphorus slag powder and 20-40 parts of silica fume.
3. The concrete according to claim 1, wherein: the composite plant fiber comprises the following components in parts by weight: 10-17 parts of jute fiber and 20-25 parts of bamboo fiber; the length of the jute fiber is 3mm, and the diameter is 15 mu m; the length of the bamboo fiber is 8mm, and the diameter is 200 μm.
4. The concrete according to claim 1, wherein: the composite metal salt comprises the following components in parts by weight: 6-9 parts of zinc sulfate and 5-9 parts of aluminum silicate.
5. The concrete according to claim 1, wherein: the natural sand is river sand with fineness modulus of 2.7; the modified recycled coarse aggregate comprises the following components in parts by weight: 400 portions of silicon nitride ceramic fragments, 400 portions of glass beads, and 200 portions of polytetrafluoroethylene waste plastic particles; the particle size range of the modified recycled coarse aggregate is 5mm-20 mm.
6. The concrete of claim 5, wherein: SiO in the glass beads2The contents are all more than 70 percent.
7. The concrete according to claim 1, wherein: the preparation method of the wave-transmitting material comprises the following steps:
(1) dispersing polymethyl methacrylate and 15-20 parts of polytetrafluoroethylene concentrated dispersion liquid at room temperature for 1 hour by using an ultrasonic disperser, and then stirring for 0.5 hour to form a mixture 1;
(2) adding 15 parts by weight of polytetrafluoroethylene concentrated dispersion into quartz chopped fibers, and dispersing for 1 hour by using a magnetic stirrer to form a mixture 2;
(3) putting the mixture 1, the mixture 2 and the chopped basalt fibers into an electric stirrer together and stirring for 1 hour; then the mixture is dried to constant weight in a drying oven at 85 ℃ to obtain a primary mixed material;
(4) and (4) crushing the primary mixed material prepared in the step (3) in a crusher to obtain the wave-transmitting material with the fineness of 100 meshes.
8. A method of producing the concrete according to claim 1, comprising the steps of:
(1) dry-mixing cement, natural sand, mineral admixture and wave-transmitting material for 5min, and uniformly mixing to form dry powder;
(2) sequentially adding the composite plant fiber and the composite metal salt into the dry powder prepared in the step (1), sequentially stirring for 3min, and then adding 3/4 water and uniformly stirring;
(3) and (3) adding the modified recycled coarse aggregate, the water reducing agent and the residual 1/4 water into the mixture prepared in the step (2) at the same time, and continuously stirring for 8-10min to obtain the modified recycled aggregate concrete with the wave-transmitting function.
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