CN115784687B - Wave-absorbing recycled concrete and preparation method thereof - Google Patents
Wave-absorbing recycled concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 95
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 70
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000017 hydrogel Substances 0.000 claims abstract description 62
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 61
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 61
- 239000002114 nanocomposite Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 23
- 239000010949 copper Substances 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 25
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 16
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 14
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000007605 air drying Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 11
- 230000000052 comparative effect Effects 0.000 description 48
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 18
- 230000000694 effects Effects 0.000 description 12
- 238000001179 sorption measurement Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 229910000323 aluminium silicate Inorganic materials 0.000 description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000000498 ball milling Methods 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000007581 slurry coating method Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Road Paving Structures (AREA)
Abstract
The application belongs to the technical field of road materials, and particularly relates to wave-absorbing recycled concrete and a preparation method thereof. The wave-absorbing recycled concrete comprises the following components in parts by weight: 100-150 parts of copper slag powder, 700-900 parts of fine aggregate, 290-420 parts of cement, 110-840 parts of modified recycled aggregate, 360-990 parts of natural coarse aggregate and 180-200 parts of water; the modified recycled aggregate is prepared by modifying the recycled aggregate by adopting graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel. The wave-absorbing recycled concrete provided by the application has good wave-absorbing performance on the basis that the service condition is met.
Description
Technical Field
The application belongs to the technical field of road materials, and particularly relates to wave-absorbing recycled concrete and a preparation method thereof.
Background
The cement concrete pavement is one of main pavement forms in China, and the preparation of the recycled aggregate into cement concrete is applied to road construction, so that the cement concrete pavement has important significance for resource conservation and environmental protection. However, the recycled aggregate can generate more cracks and damages in the service and crushing processes at the upper stage, so that the performance of the prepared cement concrete is reduced, and the large-scale application of the recycled aggregate is limited. Meanwhile, shrinkage cracks can be generated on the cement concrete pavement in cold areas in China, the pavement can be frozen due to snowfall in winter, and the driving safety is seriously influenced. Therefore, in recent years, how to apply recycled aggregate on a large scale and quickly and effectively remove snow on road surfaces is a technical problem to be solved.
The reinforcing method for the recycled aggregate mainly comprises a ball milling method and a slurry coating method. The ball milling method is to put the recycled aggregate into a ball mill for ball milling so as to remove residual mortar covered on the surface of the aggregate, and the crushing value of the recycled aggregate can be effectively reduced. However, the aggregate can generate new cracks in the ball milling process, so that the performance is reduced; the slurry coating method coats the surface of the recycled aggregate with slurry made of silica fume and fly ash so as to fill the cracks of the aggregate. However, the fusion property of the slurry and the surface of the aggregate is poor, and the slurry covered on the surface of the aggregate becomes a new weak area, so that the use of the recycled aggregate is affected.
The method for removing snow and ice includes a cleaning method and a melting method. The salt spraying method utilizes the effect of salt and water to lower the freezing point of water, so that the snow cover can be automatically melted. However, the salt spraying method can rust the steel bar fibers to peel off and destroy the pavement; the cleaning method relies on manual work to remove the ice and snow on the road surface, and has lower efficiency. Compared with the traditional deicing method, the thermal deicing method utilizes heat to melt ice and snow. The microwave deicing technology is easy to implement, and has little influence on the pavement and the building surface. When the surface of the coating is frozen, a microwave generating device is used for deicing operation, microwaves can penetrate through the ice layer to directly heat the wave-absorbing material below, and then the wave-absorbing material heats the ice layer through heat transfer, so that the purposes of melting ice and deicing are achieved. However, in the process of heating cement concrete by microwaves, the microwave heating efficiency is obviously low, and the application and popularization of the microwave heating technology in the field of pavement materials are severely limited. The reason for this is that the cement concrete material itself has the defects of low efficiency and the like of microwave heating of the cement concrete pavement material caused by poor conductors which do not absorb microwaves or absorb few microwaves and are heat.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The application aims to provide wave-absorbing recycled concrete and a preparation method thereof, which are used for solving or improving the problem of low efficiency of microwave heating of cement concrete pavement materials in the prior art.
In order to achieve the above object, the present application provides the following technical solutions: the wave-absorbing recycled concrete comprises the following components in parts by weight: 100-150 parts of copper slag powder, 700-900 parts of fine aggregate, 290-420 parts of cement, 110-840 parts of modified recycled aggregate, 360-990 parts of natural coarse aggregate and 180-200 parts of water; the modified recycled aggregate is prepared by modifying the recycled aggregate by adopting graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
Preferably, the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel is prepared by a method comprising the following steps: (1) Mixing polyvinyl alcohol, acrylamide and graphene oxide dispersion liquid, and heating until the polyvinyl alcohol and the acrylamide are completely dissolved; (2) And (3) cooling the mixture obtained by the treatment in the step (1) to room temperature, adding nano montmorillonite and ammonium persulfate, heating to 55-65 ℃ and reacting for 8-12h to obtain the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
Preferably, in the step (1), the mass ratio of the polyvinyl alcohol, the acrylamide and the graphene oxide dispersion liquid is (1-1.5): 3-4): 10-17; in the graphene oxide dispersion liquid, the mass fraction of graphene oxide is 0.15%; the heating temperature was 85.+ -. 2 ℃.
Preferably, in the step (2), the mass ratio of the nano montmorillonite to the polyvinyl alcohol is 0.173% -0.255%.
Preferably, in the step (2), the mass ratio of the ammonium persulfate to the polyvinyl alcohol is 0.260% -0.385%.
Preferably, the modified recycled aggregate is prepared by a method comprising the following steps: (I) Dissolving the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel in deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution; (II) immersing the recycled aggregate in the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution, and air-drying after the immersing is finished to obtain the modified recycled aggregate.
Preferably, in the step (I), the mass ratio of the deionized water to the polyvinyl alcohol is (1000-1500): 1; in the step (II), the soaking time is 24+/-2 hours.
Preferably, the recycled aggregate has a particle size of greater than 4.75mm.
Preferably, the copper slag powder is water quenched copper slag powder with the particle size smaller than 0.075 mm.
The application also provides a preparation method of the wave-absorbing recycled concrete, which adopts the following technical scheme: the preparation method of the wave-absorbing recycled concrete comprises the following steps: step one, uniformly mixing the copper slag powder, the fine aggregate, the cement, the modified recycled aggregate and the natural coarse aggregate; and step two, adding water into the uniform mixture obtained by the treatment in the step one, and uniformly mixing to obtain the wave-absorbing recycled concrete.
The beneficial effects are that:
in the wave-absorbing recycled concrete disclosed by the application, after the recycled aggregate is modified, graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel is covered on the surface and in cracks, the porosity of the recycled aggregate is obviously reduced, and the performance is improved. The nano composite hydrogel is of a three-dimensional reticular structure, so that the crack tip stress of the aggregate can be effectively dispersed, and the problem that recycled concrete is frost heaving or shrinkage cracking is avoided.
And (II) graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel contains graphene oxide, and the graphene oxide has excellent mechanical, electrical and thermal properties. When the hydrogel containing the graphene oxide is filled in the gap of the recycled aggregate, the graphene oxide can reduce the porosity of the recycled aggregate and improve the mechanical property of the recycled aggregate by virtue of the volume effect, the surface effect and the filling effect of the graphene oxide in the matrix; meanwhile, the graphene oxide has excellent wave absorbability and thermal conductivity, can improve the dielectric constant and the thermal conductivity of the recycled concrete, and is beneficial to improving the snow melting and deicing effects of the concrete pavement.
(III) the wave-absorbing recycled concrete material of the application uses inorganic nano montmorillonite material to bridge hydrogel monomer, nano montmorillonite is a layered mineral composed of aqueous aluminosilicate, and aluminosilicate can react with chloride ions to generate Friedel salt, thereby consuming free chloride ion content in concrete and improving compactness of the concrete, and further enhancing corrosion resistance of the concrete to chloride ions.
According to the application, the water quenched copper slag is used for replacing part of cement, so that the wave absorbing performance of the wave absorbing recycled concrete is improved while the performance of the wave absorbing recycled concrete meets road conditions, and the wave absorbing performance of the wave absorbing recycled concrete is greatly improved by performing double wave absorbing reinforcement with graphene oxide in the modified material.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a graph showing the results of microwave reflectance test of the wave-absorbing recycled concrete 28d according to examples 2 to 5 of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
The present application will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The application provides wave-absorbing recycled concrete, which aims at the problem of low efficiency of microwave heating of cement concrete pavement materials at present. The wave-absorbing recycled concrete provided by the embodiment of the application comprises the following components in parts by weight: 100 to 150 parts (for example, 100 parts, 110 parts, 120 parts, 130 parts, 140 parts or 150 parts), 700 to 900 parts (for example, 700 parts, 740 parts, 780 parts, 820 parts, 860 parts or 900 parts) of fine aggregate, 290 to 420 parts (for example, 290 parts, 310 parts, 330 parts, 350 parts, 370 parts, 390 parts, 410 parts or 420 parts) of cement, 110 to 840 parts (for example, 110 parts, 230 parts, 350 parts, 450 parts, 550 parts, 650 parts, 750 parts or 840 parts) of modified recycled aggregate, 360 to 990 parts (for example, 360 parts, 460 parts, 560 parts, 660 parts, 780 parts, 880 parts or 990 parts) of natural coarse aggregate, and 180 to 200 parts (for example, 180 parts, 185 parts, 190 parts, 195 parts or 200 parts) of water; the modified recycled aggregate is prepared by modifying the recycled aggregate by adopting graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
The regenerated aggregate is modified by adopting the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel, the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel covers the surface and cracks of the regenerated aggregate, the porosity of the regenerated aggregate is obviously reduced, and the performance is improved.
The graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel is an organic crosslinking polymer material, a polyacrylamide network formed by chemical crosslinking has higher stretchability, and a large number of amido groups are carried on the polyacrylamide nano composite hydrogel, so that a large number of reversible hydrogen bonds can be formed between hydroxyl groups carried on a polyvinyl alcohol chain and the amido groups, and after the hydrogel is damaged by external force, the dynamic reversible hydrogen bonds are restored, so that the self-healing of the composite hydrogel is realized, and the crack resistance of the recycled aggregate is improved. In addition, a large amount of free hydroxyl groups of the polyvinyl alcohol can realize the adhesion effect on various interfaces, fill cracks and gaps of the recycled aggregate, and improve the performance of the recycled aggregate.
Graphene oxide has excellent mechanical, electrical and thermal properties. When the hydrogel containing the graphene oxide fills the gaps of the recycled aggregate, the graphene oxide can reduce the porosity of the recycled aggregate and improve the mechanical properties of the recycled aggregate by virtue of the volume effect, the surface effect and the filling effect of the graphene oxide in the matrix; meanwhile, the graphene oxide has excellent wave absorbability and thermal conductivity, can improve the dielectric constant and the thermal conductivity of the recycled concrete, and is beneficial to the snow melting and ice melting effects of the recycled concrete pavement.
By adding nano montmorillonite, the inorganic nano montmorillonite material bridges graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel monomer, the nano montmorillonite is a layered mineral formed by hydrous aluminosilicate, and the aluminosilicate can react with chloride ions to generate Friedel salt, so that the free chloride ion content in the concrete is consumed, and the chloride ion erosion resistance of the concrete is further enhanced.
In the preferred embodiment of the wave-absorbing recycled concrete, the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel is prepared by a method comprising the following steps: (1) Mixing polyvinyl alcohol, acrylamide and graphene oxide dispersion liquid, and heating until the polyvinyl alcohol and the acrylamide are completely dissolved; (2) And (3) cooling the mixture obtained by the treatment in the step (1) to room temperature, adding nano montmorillonite and ammonium persulfate, heating to 55-65 ℃ (for example, 55 ℃, 58 ℃,60 ℃, 62 ℃ or 65 ℃) and reacting for 8-12 hours (for example, 8 hours, 9 hours, 10 hours, 11 hours or 12 hours) to obtain the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel.
In a preferred embodiment of the wave-absorbing recycled concrete of the present application, in the step (1), the mass ratio of the polyvinyl alcohol, the acrylamide and the graphene oxide dispersion liquid is (1 to 1.5): (3 to 4): (10 to 17) (for example, the mass ratio of the polyvinyl alcohol, the acrylamide and the graphene oxide dispersion liquid is 1:3:10, 1:4:15, 1:3.5:12, 1.5:3:10, 1.5:4:15, 1.2:3:10, 1.2:4:17 or 1.2:3.5:12);
in the graphene oxide dispersion liquid, the mass fraction of the graphene oxide is 0.15%; the temperature of heating is 85.+ -. 2 ℃ (e.g., 83 ℃, 84 ℃, 85 ℃, 86 ℃ or 87 ℃).
In a preferred embodiment of the wave-absorbing recycled concrete of the present application, in the step (2), the mass ratio of nano montmorillonite to polyvinyl alcohol is 0.173% to 0.255% (e.g., 0.173%, 0.185%, 0.195%, 0.205%, 0.215%, 0.225%, 0.235%, 0.245% or 0.255%).
In a preferred embodiment of the wave-absorbing recycled concrete of the present application, the mass ratio of ammonium persulfate to polyvinyl alcohol in step (2) is 0.260% to 0.385% (e.g., 0.260%, 0.28%, 0.30%, 0.32%, 0.34%, 0.36%, 0.38%, or 0.385%). If the ratio of each substance is outside the predetermined range, the prepared gel may be excessively crosslinked or not crosslinked, and the recycled aggregate may not be modified.
In the preferred embodiment of the wave-absorbing recycled concrete, the modified recycled aggregate is prepared by a method comprising the following steps:
(I) Dissolving graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel in deionized water to obtain graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution;
and (II) immersing the recycled aggregate in a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution, and air-drying after the immersing is finished to obtain the modified recycled aggregate.
In a preferred embodiment of the wave-absorbing recycled concrete of the present application, in the step (I), the mass ratio of deionized water to polyvinyl alcohol is (1000-1500): 1 (for example, 1000:1, 1100:1, 1200:1, 1300:1, 1400:1 or 1500:1); in step (II), the soaking time is 24±2 hours (e.g., 22 hours, 23 hours, 24 hours, 25 hours, or 26 hours). If the soaking time is too short, the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel cannot be soaked in the recycled aggregate cracks, and the modification effect of the recycled aggregate is affected.
In a preferred embodiment of the wave-absorbing recycled concrete of the present application, the recycled aggregate has a particle size of greater than 4.75mm. Namely, the modified recycled aggregate used in the present application is a modified recycled coarse aggregate
In a preferred embodiment of the wave-absorbing recycled concrete, the copper slag powder is water quenched copper slag powder with the particle size of less than 0.075 mm. The water quenching copper slag is adopted to replace part of cement, so that the wave absorbing performance of the recycled concrete can be improved while the performance of the recycled concrete meets road conditions, and the water quenching copper slag and graphene oxide in the modified recycled aggregate perform double wave absorbing reinforcement effects, so that the wave absorbing performance of the recycled concrete is greatly improved.
The application also provides a preparation method of the wave-absorbing recycled concrete, which comprises the following steps: step one, uniformly mixing copper slag powder, fine aggregate, cement, modified recycled aggregate and natural coarse aggregate; and step two, adding water into the uniform mixture obtained by the treatment in the step one, and uniformly mixing to obtain the wave-absorbing regenerated concrete.
The wave-absorbing recycled concrete and the method for preparing the same according to the present application will be described in detail with reference to the following examples.
In the following examples: the tap density of the graphene oxide is 270g/L; polyvinyl alcohol is supplied by national pharmaceutical group chemical reagent Co., ltd and has the molecular formula [ -CH ] 2 CHOH-]n/(C 2 H 4 O) n; acrylamide is supplied by national pharmaceutical group chemical reagent Co., ltd, and has a molecular formula of C 3 H 5 NO. The cement adopts P.O42.5 grade cement; the fine aggregate adopts river sand, and the fineness modulus is 2.5. The natural aggregate is 5 mm-25 mm continuous graded limestone broken stone, and the crushing value is 9.6; the recycled aggregate is waste concrete with the strength of C30 and C40, the used broken stone is limestone, and the crushing value is 14.5.
Example 1
The preparation method of the modified recycled aggregate of the embodiment comprises the following steps:
(1) Ultrasonically dispersing 0.015 part by mass of graphene oxide in 10 parts by mass of deionized water to obtain graphene oxide dispersion liquid;
(2) Adding 1.5 parts by mass of polyvinyl alcohol and 3.5 parts by mass of acrylamide to the graphene oxide dispersion liquid obtained in the step (1), and heating the mixture at 85 ℃ until the polyvinyl alcohol and the acrylamide are completely dissolved;
(3) Cooling the mixture obtained by the treatment in the step (2) to room temperature, and adding 0.0026 part by mass of nano montmorillonite and 0.0039 part by mass of ammonium persulfate, and reacting at 60 ℃ for 10 hours to obtain graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel;
(4) Mechanically stirring and dissolving the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel obtained by the reaction in the step (3) into 1000 parts by mass of deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution;
(5) And (3) immersing the recycled aggregate (with the particle size of more than 4.75 mm) in the graphene/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution obtained by the treatment in the step (4) for 24 hours, and naturally air-drying after the immersing is finished, thus obtaining the modified recycled aggregate (modified recycled coarse aggregate) of the embodiment.
Example 2
The wave-absorbing recycled concrete of the present embodiment comprises, in terms of mass of one side (one cubic meter): 120 parts of copper slag powder, 700 parts of fine aggregate, 320 parts of cement, 840 parts of modified recycled coarse aggregate (prepared in example 1), 360 parts of natural coarse aggregate and 180 parts of water.
The preparation method of the wave-absorbing recycled concrete comprises the following steps:
step one: weighing steel slag powder, fine aggregate, cement, modified recycled coarse aggregate, natural coarse aggregate and water according to the parts by weight;
step two: mixing and stirring the steel slag powder, the fine aggregate, the cement, the modified recycled coarse aggregate and the natural coarse aggregate uniformly;
step three: and (3) adding water into the mixture obtained in the step (II), and uniformly mixing to obtain the wave-absorbing recycled concrete.
Example 3
The wave-absorbing recycled concrete of the present embodiment comprises, in terms of mass of one side (one cubic meter): 100 parts of copper slag powder, 750 parts of fine aggregate, 340 parts of cement, 600 parts of modified recycled coarse aggregate (prepared in example 1), 600 parts of natural coarse aggregate and 185 parts of water.
The method for preparing the wave-absorbing recycled concrete of the present example is the same as that of example 2.
Example 4
The wave-absorbing recycled concrete of the present embodiment comprises, in terms of mass of one side (one cubic meter): 130 parts of copper slag powder, 800 parts of fine aggregate, 310 parts of cement, 300 parts of modified recycled coarse aggregate (prepared in example 1), 900 parts of natural coarse aggregate and 190 parts of water.
The method for preparing the wave-absorbing recycled concrete of the present example is the same as that of example 2.
Example 5
The wave-absorbing recycled concrete of the present embodiment comprises, in terms of mass of one side (one cubic meter): 150 parts of copper slag powder, 900 parts of fine aggregate, 290 parts of cement, 110 parts of modified recycled coarse aggregate (prepared in example 1), 990 parts of natural coarse aggregate and 200 parts of water.
The method for preparing the wave-absorbing recycled concrete of the present example is the same as that of example 2.
Comparative example 1
The wave-absorbing recycled concrete of this comparative example comprises, by mass in a single direction: 700 parts of fine aggregate, 420 parts of cement, 840 parts of modified recycled coarse aggregate (prepared in example 1), 360 parts of natural coarse aggregate and 180 parts of water.
The method for preparing the wave-absorbing recycled concrete of the comparative example is the same as that of example 2.
Comparative example 2
The wave-absorbing recycled concrete of this comparative example comprises, by mass in a single direction: 120 parts of copper slag powder, 700 parts of fine aggregate, 320 parts of cement, 840 parts of modified recycled coarse aggregate (the recycled aggregate is not modified by adopting the method of the application), 360 parts of natural coarse aggregate and 180 parts of water.
The method for preparing the wave-absorbing recycled concrete of the comparative example is the same as that of example 2.
Comparative example 3
The nanocomposite hydrogels of this comparative example differ from example 1 only in that: the raw materials for preparing the recycled aggregate modified hydrogel do not contain graphene oxide (equal amount of deionized water is used for replacing the graphene oxide dispersion liquid in the step (2) of the embodiment 1), and the rest is consistent with the embodiment 1; after the treatment of the step (3), the nanocomposite hydrogel of comparative example 3 (polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) was obtained.
Thereafter, the nanocomposite hydrogel (polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) of comparative example 3 and recycled aggregate were treated in the same manner as in steps (4) to (5) of example 1, to obtain a modified recycled aggregate of comparative example 3.
The recycled concrete of this comparative example (comparative example 3) differs from example 2 only in that: the modified recycled aggregate of comparative example 3 was used instead of the modified recycled aggregate of example 2, the remainder being identical to example 2; the recycled concrete of this comparative example was obtained.
Comparative example 4
The nanocomposite hydrogels of this comparative example differ from example 1 only in that: in step (3), the same amount of acrylic acid was used instead of nano montmorillonite bridging hydrogel monomer, the remainder being identical to example 1. After the treatment in the step (3), the nanocomposite hydrogel (acrylic acid-graphene polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) of comparative example 4 was obtained.
Thereafter, the nanocomposite hydrogel of comparative example 4 (acrylic acid-graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel) and recycled aggregate were treated in the same manner as in steps (4) to (5) of example 1, to obtain a modified recycled aggregate of comparative example 4.
The recycled concrete of this comparative example (comparative example 4) differs from example 2 only in that: the modified recycled aggregate of comparative example 4 was used instead of the modified recycled aggregate of example 2, the remainder being identical to example 2; the recycled concrete of this comparative example was obtained.
Experimental example
1. The concrete test pieces of examples 2 to 5 and comparative examples 1 to 4 were tested for compressive strength, split tensile strength and abrasion resistance according to the test procedure for highway engineering cement and cement concrete (JTG 3420-2020); test pieces for reflectivity using the bow-reflection method (NRL) for the examples and comparative examples are shown in table 1, table 2 and fig. 1, respectively.
Table 1 compressive strength of concrete test piece 28d
As can be seen from table 1: the compressive strength of the recycled concrete increased with the increase of the blending amount of the natural aggregate, and the compressive strength of example 5 was the highest. The coarse aggregate of comparative example 2 was not modified with nanocomposite hydrogel, and thus its compressive strength was lower than that of example 2, comparative example 3, and comparative example 4.
Table 2 concrete test piece 28d split tensile strength
| Concrete test piece | Splitting compressive Strength (MPa) |
| Example 2 | 2.879 |
| Example 3 | 3.071 |
| Example 4 | 3.244 |
| Example 5 | 3.473 |
| Comparative example 1 | 2.933 |
| Comparative example 2 | 2.687 |
| Comparative example 3 | 2.886 |
| Comparative example 4 | 2.873 |
As can be seen from table 2: the splitting tensile strength of recycled concrete also increases with the increase of the mixing amount of the natural aggregate, and the splitting tensile strength of recycled concrete prepared by using the recycled aggregate modified by the nano composite hydrogel (example 2, comparative example 3 and comparative example 4) is higher than that of recycled concrete prepared by using the unmodified recycled aggregate (comparative example 2).
The results of the microwave reflectances of the various examples and comparative examples concrete test pieces 28d are shown in FIG. 1:
as can be seen from FIG. 1, the reflection loss peak value of the wave-absorbing recycled concrete of example 2 is the largest in the frequency range of 3 GHz-16 GHz, which shows that the wave-absorbing recycled concrete of example 2 has the best microwave absorption capacity, and the copper slag and the modified aggregate increase the wave-absorbing property of the cement concrete. In the concrete of comparative example 1, the copper slag content was 0, so that the reflection loss peak value was lower than that of example 2; however, the modified recycled aggregate content in comparative example 1 is the greatest, so that the graphene oxide content in the cement concrete is the highest, and the reflectivity peak value of the modified recycled aggregate at about 5.2GHz is large, which indicates that the graphene oxide can improve the wave absorbing performance of the cement concrete. In the concrete of comparative example 2, the copper slag was doped in the same amount as in example 1, but the aggregate was not reinforced with graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel, so that the peak value of reflectance at about 5.2GHz was the lowest. The composite hydrogel of comparative example 3 does not contain graphene oxide and therefore has slightly lower wave-absorbing properties than example 2. The reflection loss of comparative example 4 is not much different from that of example 2, which shows that the nano montmorillonite has no obvious influence on the concrete wave absorbing property.
2. The chlorine ion adsorption amounts of the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogels of example 1 (the product obtained by the treatment of step (3) in example 1) and the nanocomposite hydrogels of comparative examples 3 to 4 were measured:
preparing 0.1mol/L NaCl solution, weighing 1g of nano composite hydrogel sample, dissolving in 50mL of NaCl solution, placing the beaker in a constant-temperature water bath stirring pot at room temperature for stirring reaction, and timing. In order to prevent foreign ion interference in laboratory environment, the pH value of the solution is controlled by the prepared dilute nitric acid solution and sodium hydroxide solution. And (3) sucking 5mL of solution every 30min during stirring by a liquid-transferring gun, separating at high speed by a centrifuge, extracting an upper suspension, titrating chloride ions of the suspension by using a potentiometric titrator until the concentration of the chloride ions is unchanged, stopping titration, recording real-time data, and testing the results shown in Table 3.
TABLE 3 results of chlorine ion adsorption Capacity test
| Example 1 | Comparative example 3 | Comparative example 4 | |
| Adsorption capacity of chloride ion per unit mass (mg/g) | 31.45 | 31.95 | 13.67 |
Table 3 shows the results of the chlorine ion adsorption capacity test of the nanocomposite hydrogel, and it can be seen that the graphene oxide/polyvinyl alcohol/polyacrylamide nanocomposite hydrogel of example 1 has the strongest chlorine ion adsorption capacity; the chloride ion adsorption capacity of the nanocomposite hydrogel of comparative example 3 was not much different from that of example 1; the nanocomposite hydrogel of comparative example 4 had the weakest chloride ion adsorption capacity. The hydrogel is a porous material and has a certain physical adsorption capacity to ions, however, aluminosilicate contained in the nano montmorillonite can react with chloride ions to further strengthen the adsorption of external free chloride ions, so that the nano composite hydrogel of the comparative example 4 without nano montmorillonite has the weakest adsorption capacity to chloride ions.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. The wave-absorbing recycled concrete is characterized by comprising the following components in parts by weight: 100-150 parts of copper slag powder, 700-900 parts of fine aggregate, 290-420 parts of cement, 110-840 parts of modified recycled aggregate, 360-990 parts of natural coarse aggregate and 180-200 parts of water;
the modified recycled aggregate is prepared by modifying the recycled aggregate by adopting graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel;
the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel is prepared by a method comprising the following steps:
(1) Mixing polyvinyl alcohol, acrylamide and graphene oxide dispersion liquid, and heating until the polyvinyl alcohol and the acrylamide are completely dissolved; the mass ratio of the polyvinyl alcohol to the acrylamide to the graphene oxide dispersion liquid is (1-1.5): 3-4): 10-17; in the graphene oxide dispersion liquid, the mass fraction of graphene oxide is 0.15%; the heating temperature is 85+/-2 ℃;
(2) Cooling the mixture obtained by the treatment in the step (1) to room temperature, adding nano montmorillonite and ammonium persulfate, heating to 55-65 ℃ and reacting for 8-12h to obtain graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel; the mass ratio of the nano montmorillonite to the polyvinyl alcohol is 0.173% -0.255%;
the modified recycled aggregate is prepared by a method comprising the following steps:
(I) Dissolving the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel in deionized water to obtain a graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel solution;
(II) immersing the recycled aggregate in the graphene oxide/polyvinyl alcohol/polyacrylamide nano composite hydrogel aqueous solution, and air-drying after the immersing is finished to obtain the modified recycled aggregate;
in the step (I), the mass ratio of the deionized water to the polyvinyl alcohol is (1000-1500) 1; in the step (II), the soaking time is 24+/-2 hours.
2. The wave-absorbing recycled concrete according to claim 1, wherein in the step (2), the mass ratio of the ammonium persulfate to the polyvinyl alcohol is 0.260% -0.385%.
3. The wave-absorbing recycled concrete according to claim 1, wherein the recycled aggregate has a particle size of greater than 4.75mm.
4. A wave-absorbing recycled concrete according to any one of claims 1-3, wherein the copper slag powder is water quenched copper slag powder having a particle size of less than 0.075 mm.
5. The method for producing a wave-absorbing recycled concrete according to any one of claims 1 to 4, comprising the steps of:
step one, uniformly mixing the copper slag powder, the fine aggregate, the cement, the modified recycled aggregate and the natural coarse aggregate;
and step two, adding water into the uniform mixture obtained by the treatment in the step one, and uniformly mixing to obtain the wave-absorbing recycled concrete.
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